added wasm port

renamed rdraught-ui to rdraught-gtk

.gitignore

@@ -1 +1,2 @@
 /target
+/rdraught-wasm/dist

Cargo.toml

@@ -1,5 +1,13 @@
 [workspace]
-members = ["rdraught", "rdraught-cli", "rdraught-pi", "rdraught-ui"]
+members = [
+  "rdraught",
+  "rdraught-cli",
+  "rdraught-gtk",
+  "rdraught-w4",
+  "rdraught-wasm",
+  "rdraught-sdl",
+  "rdraught-ui-common",
+]
 resolver = "3"
 
 [workspace.package]
@@ -12,15 +20,24 @@ edition = "2024"
 rust-version = "1.87"
 
 [workspace.dependencies]
-rdraught = { path = "rdraught", version = "0.1.0" }
+rdraught = { path = "rdraught", version = "0.1" }
+rdraught-ui-common = { path = "rdraught-ui-common", version = "0.1" }
+base64 = "0.22"
 cairo-rs = "0.20"
 cairo-sys-rs = "0.20"
 librsvg = "2.60"
-gtk4 = "0.9"
+gtk4 = {version = "0.9", features = ["v4_10"] }
 gdk4 = "0.9"
-gio = "0.20.12"
+gio = "0.20"
-glib = "0.20.12"
+glib = "0.20"
-
+wasm4 = "0.2"
-#[patch.crates-io]
+wasm4-sys = "0.1"
-#cairo-rs = { git = "https://github.com/gtk-rs/gtk-rs-core.git", package = "cairo-rs", tag="0.20.12" }
+strum = "0.27"
-#cairo-sys-rs = { git = "https://github.com/gtk-rs/gtk-rs-core.git", package = "cairo-sys-rs", tag="0.20.12" }
+strum_macros = "0.27"
+heapless = "0.8"
+wasm-bindgen = "0.2"
+web-sys = "0.3"
+console_error_panic_hook = "0.1"
+sdl3 = { version = "0.14.35" }
+sdl3-sys = { version = "0.5" }
+rmath = {version = "0.1.0", registry = "gitea"}

rdraught-gtk/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "rdraught-ui"
+name = "rdraught-gtk"
 authors.workspace = true
 edition.workspace = true
 homepage.workspace = true
@@ -11,9 +11,18 @@ version.workspace = true
 [dependencies]
 gtk4.workspace = true
 gdk4.workspace = true
-rdraught.workspace = true
+rdraught = {workspace = true, features = ["std"]}
+rdraught-ui-common = { workspace = true }
 librsvg.workspace = true
 cairo-rs.workspace = true
 gio.workspace = true
 glib.workspace = true
 
+[lib]
+name = "rdraught_gtk"
+crate-type = ["lib"]
+bench = false
+
+[[bin]]
+name = "rdraught-gtk"
+path = "src/main.rs"

rdraught-gtk/examples/ai_debugger.rs

@@ -0,0 +1,35 @@
+use glib::ExitCode;
+use rdraught::{DraughtsBoard, DraughtsGame, Move, Piece, Player, Position};
+use rdraught_gtk::run;
+use std::collections::HashMap;
+
+fn main() -> ExitCode {
+    println!("move: {}", size_of::<Move>());
+    println!("game: {}", size_of::<DraughtsGame>());
+
+    // let boards = [[(Position::new(2, 4), Piece::CrownedRedPawn)]];
+
+    // for pieces in boards.into_iter() {
+    //     let map = pieces.into_iter().collect::<HashMap<Position, Piece>>();
+    //     let board = DraughtsBoard::new(|p| match map.get(&p) {
+    //         None => Piece::NoPiece,
+    //         Some(piece) => *piece,
+    //     });
+    //     println!("{:?}", board);
+    //     for (pos, piece) in map.iter() {
+    //         assert_eq!(*piece, board.get(*pos));
+    //     }
+    // }
+    ExitCode::SUCCESS
+    // let mut pieces = HashMap::<Position, Piece>::new();
+    // pieces.insert(Position::new(2, 4), Piece::CrownedRedPawn);
+    // pieces.insert(Position::new(5, 5), Piece::CrownedWhitePawn);
+    // let game = DraughtsGame::new(
+    //     |p| match pieces.get(&p) {
+    //         None => Piece::NoPiece,
+    //         Some(piece) => *piece,
+    //     },
+    //     Player::Red,
+    // );
+    // run(game)
+}

rdraught-gtk/src/final_dialog.rs

@@ -0,0 +1,12 @@
+use gtk4::{AlertDialog, Window, prelude::IsA};
+use rdraught::Player;
+
+pub(crate) async fn create_dialog<W: IsA<Window>>(window: W, winner: Player) {
+    let msg = match winner {
+        Player::Red => String::from("Red player wins"),
+        Player::White => String::from("White player wins"),
+    };
+    let info_dialog = AlertDialog::builder().modal(true).message(msg).build();
+
+    info_dialog.show(Some(&window));
+}

rdraught-gtk/src/greeting_dialog.rs

@@ -0,0 +1,62 @@
+use gtk4::{Align, Application, Box, CheckButton, Label, Orientation, Window, prelude::*};
+
+use rdraught::Player;
+use rdraught_ui_common::SharedMutable;
+
+pub(crate) fn create(application: &Application, current_player: SharedMutable<Player>) -> Window {
+    let label = Label::builder().label("Main player:").build();
+    let red_player_button = CheckButton::builder().label("Red").active(true).build();
+    let white_player_button = CheckButton::builder()
+        .label("White")
+        .active(false)
+        .group(&red_player_button)
+        .build();
+    let current_player_1 = current_player.clone();
+    red_player_button.connect_toggled(move |b| {
+        if b.is_active() {
+            current_player_1.set(Player::Red);
+        }
+    });
+    let current_player_2 = current_player.clone();
+    white_player_button.connect_toggled(move |b| {
+        if b.is_active() {
+            current_player_2.set(Player::White);
+        }
+    });
+    let main_player_selector = Box::builder()
+        .valign(Align::Center)
+        .halign(Align::Center)
+        .spacing(10)
+        .orientation(Orientation::Horizontal)
+        .build();
+
+    main_player_selector.append(&label);
+    main_player_selector.append(&red_player_button);
+    main_player_selector.append(&white_player_button);
+    let layout = Box::builder()
+        .valign(Align::Center)
+        .halign(Align::Center)
+        .spacing(10)
+        .orientation(Orientation::Vertical)
+        .build();
+    layout.append(&main_player_selector);
+    layout.set_margin_top(10);
+    layout.set_margin_bottom(10);
+    layout.set_margin_start(10);
+    layout.set_margin_end(10);
+    let player_select_dialog = Window::builder()
+        .application(application)
+        .title("Rdraught")
+        .modal(true)
+        .child(&layout)
+        .visible(true)
+        .build();
+
+    player_select_dialog.connect_close_request(move |window| {
+        if let Some(application) = window.application() {
+            application.remove_window(window);
+        }
+        glib::Propagation::Proceed
+    });
+    player_select_dialog
+}

rdraught-gtk/src/lib.rs

@@ -0,0 +1,5 @@
+mod final_dialog;
+mod greeting_dialog;
+mod rdraught_application;
+
+pub use rdraught_application::run;

rdraught-gtk/src/main.rs

@@ -0,0 +1,7 @@
+use glib::ExitCode;
+use rdraught::draughts::DraughtsGame;
+
+fn main() -> ExitCode {
+    let game = DraughtsGame::default();
+    rdraught_gtk::run(game)
+}

rdraught-gtk/src/rdraught_application.rs

@@ -0,0 +1,604 @@
+use core::f64::consts::PI;
+use gdk4::cairo::{Context as CairoContext, Matrix, Rectangle};
+use glib::ExitCode;
+use gtk4::glib::{MainContext, Propagation};
+use gtk4::{self as gtk, gdk::ffi::GDK_BUTTON_PRIMARY};
+use gtk4::{Application, Button, DrawingArea, HeaderBar, prelude::*};
+use rdraught::{
+    DraughtsBoard, DraughtsGame, Move, Piece, Player, Position, RDraughtApplication,
+    RectangularBoard,
+};
+use rsvg::SvgHandle;
+const SQUARE_SIZE: f64 = 1.0;
+
+use super::final_dialog;
+use super::greeting_dialog;
+use rdraught_ui_common::{
+    Point, SharedMutable, SharedMutableRef, new_shared_mut, new_shared_mut_ref,
+};
+
+const CROWN_RED: &[u8] = include_bytes!("crown_red.svg");
+const CROWN_WHITE: &[u8] = include_bytes!("crown_white.svg");
+
+fn transform_point(p: &Point, m: &Matrix) -> Point {
+    let (x, y) = m.transform_point(p.x(), p.y());
+    Point::new(x, y)
+}
+
+trait AugmentedRect {
+    fn from_points(tl: Point, br: Point) -> Rectangle;
+    fn center(&self) -> Point;
+    fn tl(&self) -> Point;
+    fn br(&self) -> Point;
+    fn contains(&self, p: &Point) -> bool;
+}
+
+impl AugmentedRect for Rectangle {
+    fn center(&self) -> Point {
+        Point::new(
+            self.x() + self.width() / 2.0,
+            self.y() + self.height() / 2.0,
+        )
+    }
+
+    fn tl(&self) -> Point {
+        Point::new(self.x(), self.y())
+    }
+
+    fn br(&self) -> Point {
+        Point::new(self.x() + self.width(), self.y() + self.height())
+    }
+
+    fn from_points(tl: Point, br: Point) -> Rectangle {
+        Rectangle::new(tl.x(), tl.y(), br.x() - tl.x(), br.y() - tl.y())
+    }
+
+    fn contains(&self, p: &Point) -> bool {
+        self.x() < p.x()
+            && self.x() + self.width() > p.x()
+            && self.y() < p.y()
+            && self.y() + self.height() > p.y()
+    }
+}
+
+fn draw_piece(
+    cr: &CairoContext,
+    square: &Rectangle,
+    piece: Piece,
+    crown_red: &SvgHandle,
+    crown_white: &SvgHandle,
+) -> Result<(), cairo::Error> {
+    if let Piece::NoPiece = piece {
+        Ok(())
+    } else {
+        cr.save()?;
+        let center = square.center();
+        let outer_radius = square.width() * 0.3;
+        let vertical_scale_factor = 0.8;
+        let matrix = {
+            let mut m1 = Matrix::identity();
+            m1.translate(0.0, -(center.y() - outer_radius));
+            let mut m2 = Matrix::identity();
+            m2.scale(1.0, vertical_scale_factor);
+            let mut m3 = Matrix::identity();
+            m3.translate(0.0, center.y() - outer_radius * vertical_scale_factor);
+            Matrix::multiply(&Matrix::multiply(&m1, &m2), &m3)
+        };
+        cr.set_matrix(Matrix::multiply(&matrix, &cr.matrix()));
+        cr.set_source_rgb(0.0, 0.0, 0.0);
+        let thickness = outer_radius * 0.3;
+        cr.arc(
+            center.x(),
+            center.y() + thickness / 2.0,
+            outer_radius,
+            0.0,
+            2.0 * PI,
+        );
+        cr.rectangle(
+            center.x() - outer_radius,
+            center.y() - thickness / 2.0,
+            outer_radius * 2.0,
+            thickness,
+        );
+        cr.arc(
+            center.x(),
+            center.y() - thickness / 2.0,
+            outer_radius,
+            0.0,
+            2.0 * PI,
+        );
+        cr.fill().unwrap();
+        let (color, crowned) = match piece {
+            Piece::NoPiece => return Ok(()),
+            Piece::SimpleRedPawn => ((1.0, 0.0, 0.0), false),
+            Piece::SimpleWhitePawn => ((1.0, 1.0, 1.0), false),
+            Piece::CrownedRedPawn => ((1.0, 0.0, 0.0), true),
+            Piece::CrownedWhitePawn => ((1.0, 1.0, 1.0), true),
+        };
+        let radius = square.width() * 0.275;
+        cr.set_source_rgb(color.0, color.1, color.2);
+        cr.arc(
+            center.x(),
+            center.y() - thickness / 2.0,
+            radius,
+            0.0,
+            2.0 * PI,
+        );
+        cr.fill()?;
+        cr.restore()?;
+        if crowned {
+            let renderer = match piece.player() {
+                Some(Player::Red) => rsvg::CairoRenderer::new(crown_red),
+                Some(Player::White) => rsvg::CairoRenderer::new(crown_white),
+                None => panic!("This should never happen"),
+            };
+            let m4 = {
+                let mut m1 = Matrix::identity();
+                m1.translate(-center.x(), -(center.y() - thickness / 1.0));
+                let mut m2 = Matrix::identity();
+                m2.scale(0.5, 0.5);
+                let mut m3 = Matrix::identity();
+                m3.translate(center.x(), center.y() - thickness / 1.0);
+                Matrix::multiply(&Matrix::multiply(&m1, &m2), &m3)
+            };
+            cr.set_matrix(Matrix::multiply(
+                &Matrix::multiply(&matrix, &m4),
+                &cr.matrix(),
+            ));
+            renderer
+                .render_document(
+                    cr,
+                    &cairo::Rectangle::new(
+                        square.tl().x(),
+                        square.tl().y(),
+                        square.width(),
+                        square.height(),
+                    ),
+                )
+                .unwrap();
+        }
+        Ok(())
+    }
+}
+
+fn draw_score_bar(
+    cr: &CairoContext,
+    board: &Rectangle,
+    draughts_game: &DraughtsGame,
+    current_player: Player,
+) {
+    fn modulate_score(relative_score: f64) -> f64 {
+        let x = relative_score;
+        1.0 - (f64::atan(8.0 * x - 4.0) / f64::atan(4.0) / 2.0 + 0.5)
+    }
+    let score_bar = Rectangle::new(
+        board.tl().x() - board.width() / 10.0,
+        board.tl().y(),
+        board.width() / 16.0,
+        board.height(),
+    );
+    let num_rects = 40usize;
+    let spacing = board.height() / 200.0;
+    let rect_height = (board.height() - spacing * (num_rects - 1) as f64) / (num_rects as f64);
+    let score_percentage = modulate_score(draughts_game.relative_score(current_player) as f64);
+    let threshold = (score_percentage * num_rects as f64) as usize;
+    let tl = score_bar.tl();
+    cr.save().unwrap();
+    cr.set_line_width(spacing / 4.0);
+    for i in 0..threshold {
+        match current_player {
+            Player::White => cr.set_source_rgb(1.0, 0.0, 0.0),
+            Player::Red => cr.set_source_rgb(1.0, 1.0, 1.0),
+        }
+        cr.rectangle(
+            tl.x(),
+            tl.y() + i as f64 * (rect_height + spacing),
+            score_bar.width(),
+            rect_height,
+        );
+        cr.fill().unwrap();
+        cr.set_source_rgb(0.0, 0.0, 0.0);
+        cr.rectangle(
+            tl.x(),
+            tl.y() + i as f64 * (rect_height + spacing),
+            score_bar.width(),
+            rect_height,
+        );
+        cr.stroke().unwrap();
+    }
+    for i in threshold..num_rects {
+        match current_player {
+            Player::White => cr.set_source_rgb(1.0, 1.0, 1.0),
+            Player::Red => cr.set_source_rgb(1.0, 0.0, 0.0),
+        }
+        cr.rectangle(
+            tl.x(),
+            tl.y() + i as f64 * (rect_height + spacing),
+            score_bar.width(),
+            rect_height,
+        );
+        cr.fill().unwrap();
+        cr.set_source_rgb(0.0, 0.0, 0.0);
+        cr.rectangle(
+            tl.x(),
+            tl.y() + i as f64 * (rect_height + spacing),
+            score_bar.width(),
+            rect_height,
+        );
+        cr.stroke().unwrap();
+    }
+    cr.restore().unwrap();
+}
+
+fn create_game_window(
+    rd: SharedMutableRef<RDraughtApplication>,
+    application: &Application,
+    current_player: Player,
+) {
+    // Create a new window.
+    let window = gtk::ApplicationWindow::builder()
+        .application(application)
+        .title("Rdraught")
+        .default_width(800)
+        .default_height(800)
+        .build();
+    let header_bar = HeaderBar::new();
+    window.set_titlebar(Some(&header_bar));
+
+    let undo_button = Button::new();
+    undo_button.set_icon_name("edit-undo-symbolic");
+    undo_button.set_sensitive(false);
+
+    let redo_button = Button::new();
+    redo_button.set_icon_name("edit-redo-symbolic");
+    redo_button.set_sensitive(false);
+
+    let selected_piece: SharedMutable<Option<Position>> = new_shared_mut(None);
+    let available_moves = new_shared_mut_ref(Vec::<Move>::new());
+    // Create a DrawingArea widget where we will draw the chessboard.
+    let drawing_area = DrawingArea::new();
+    // Add the drawing area to the window.
+    window.set_child(Some(&drawing_area));
+
+    header_bar.pack_start(&undo_button);
+    {
+        let da = drawing_area.clone();
+        let rd = rd.clone();
+        let undo_btn_clone = undo_button.clone();
+        let redo_btn_clone = redo_button.clone();
+        let selected_piece = selected_piece.clone();
+        let available_moves = available_moves.clone();
+        undo_button.connect_clicked(move |_| {
+            let mut rd = rd.borrow_mut();
+            if rd.can_undo() {
+                rd.undo().ok();
+                redo_btn_clone.set_sensitive(rd.can_redo());
+                undo_btn_clone.set_sensitive(rd.can_undo());
+                selected_piece.set(None);
+                available_moves.borrow_mut().clear();
+                da.queue_draw();
+            }
+        });
+    }
+    header_bar.pack_start(&redo_button);
+    {
+        let da = drawing_area.clone();
+        let rd = rd.clone();
+        let undo_btn_clone = undo_button.clone();
+        let redo_btn_clone = redo_button.clone();
+        let selected_piece = selected_piece.clone();
+        let available_moves = available_moves.clone();
+        redo_button.connect_clicked(move |_| {
+            let mut rd = rd.borrow_mut();
+            if rd.can_redo() {
+                rd.redo().ok();
+                redo_btn_clone.set_sensitive(rd.can_redo());
+                undo_btn_clone.set_sensitive(rd.can_undo());
+                selected_piece.set(None);
+                available_moves.borrow_mut().clear();
+                da.queue_draw();
+            }
+        });
+    }
+    // Get the allocation information for the widget.
+    let board_width = SQUARE_SIZE * DraughtsBoard::rows() as f64;
+    let board_height = SQUARE_SIZE * DraughtsBoard::columns() as f64;
+    let board = Rectangle::from_points(Point::new(0.0, 0.0), Point::new(board_width, board_height));
+    let board_with_bar = Rectangle::from_points(
+        Point::new(-board_width / 10.0, 0.0),
+        Point::new(board_width, board_height),
+    );
+    let board_clone = board;
+    let crown_red_handle = {
+        let stream = gio::MemoryInputStream::from_bytes(&glib::Bytes::from_static(CROWN_RED));
+        rsvg::Loader::new()
+            .read_stream(
+                &stream,
+                None::<&gio::File>, // no base file as this document has no references
+                None::<&gio::Cancellable>, // no cancellable
+            )
+            .unwrap()
+    };
+    let crown_white_handle = {
+        let stream = gio::MemoryInputStream::from_bytes(&glib::Bytes::from_static(CROWN_WHITE));
+
+        rsvg::Loader::new()
+            .read_stream(
+                &stream,
+                None::<&gio::File>, // no base file as this document has no references
+                None::<&gio::Cancellable>, // no cancellable
+            )
+            .unwrap()
+    };
+    let xform = new_shared_mut_ref(Matrix::identity());
+    // Set the "draw" function of the drawing area. This callback is called
+    // whenever GTK needs to redraw this widget (for example, on first display or when resized).
+    {
+        let rd = rd.clone();
+        let xform = xform.clone();
+        let selected_piece = selected_piece.clone();
+        let available_moves = available_moves.clone();
+        drawing_area.set_draw_func(move |_widget, cr, width, height| {
+            let screen = Rectangle::from_points(
+                Point::new(0.0, 0.0),
+                Point::new(width as f64, height as f64),
+            );
+            let f = f64::min(
+                screen.width() / board_with_bar.width(),
+                screen.height() / board_with_bar.height(),
+            );
+            let screen_center = screen.center();
+            let board_center = board_with_bar.center();
+            let mut xform = xform.borrow_mut();
+            *xform = Matrix::multiply(
+                &Matrix::multiply(
+                    &Matrix::new(1.0, 0.0, 0.0, 1.0, -board_center.x(), -board_center.y()),
+                    &Matrix::new(f, 0.0, 0.0, f, 0.0, 0.0),
+                ),
+                &Matrix::new(1.0, 0.0, 0.0, 1.0, screen_center.x(), screen_center.y()),
+            );
+            cr.set_matrix(*xform);
+
+            // Loop over rows and columns to draw each chessboard cell.
+            for row in 0..DraughtsBoard::rows() {
+                for col in 0..DraughtsBoard::columns() {
+                    let position = match current_player {
+                        Player::Red => Position::new(row as u8, (8 - 1 - col) as u8),
+                        Player::White => Position::new((8 - 1 - row) as u8, col as u8),
+                    };
+                    let square = Rectangle::new(
+                        col as f64 * SQUARE_SIZE,
+                        row as f64 * SQUARE_SIZE,
+                        SQUARE_SIZE,
+                        SQUARE_SIZE,
+                    );
+                    cr.save().unwrap();
+                    // Alternate colors based on the sum of row and column indices.
+                    if (row + col) % 2 == 0 {
+                        cr.set_source_rgb(0.8, 0.8, 0.6);
+                    } else {
+                        cr.set_source_rgb(0.4, 0.4, 0.2);
+                    }
+
+                    // Draw and fill the square.
+                    cr.rectangle(
+                        square.tl().x(),
+                        square.tl().y(),
+                        square.width(),
+                        square.height(),
+                    );
+                    cr.fill().unwrap();
+                    draw_piece(
+                        cr,
+                        &square,
+                        position.map_or(Piece::NoPiece, |p| rd.borrow().game().piece_at(p)),
+                        &crown_red_handle,
+                        &crown_white_handle,
+                    )
+                    .unwrap();
+                    cr.restore().unwrap();
+                }
+            }
+            if let Some(selected_position) = selected_piece.get() {
+                let screen_position = match current_player {
+                    Player::White => (8 - 1 - selected_position.row(), selected_position.col()),
+                    Player::Red => (selected_position.row(), 8 - 1 - selected_position.col()),
+                };
+                let square = Rectangle::new(
+                    screen_position.1 as f64 * SQUARE_SIZE,
+                    screen_position.0 as f64 * SQUARE_SIZE,
+                    SQUARE_SIZE,
+                    SQUARE_SIZE,
+                );
+                cr.save().unwrap();
+                cr.new_path();
+                cr.move_to(square.tl().x(), square.tl().y());
+                cr.line_to(square.tl().x(), square.br().y());
+                cr.line_to(square.br().x(), square.br().y());
+                cr.line_to(square.br().x(), square.tl().y());
+                cr.line_to(square.tl().x(), square.tl().y());
+                cr.clip();
+                cr.new_path();
+                cr.set_source_rgb(0.0, 0.0, 1.0);
+                cr.set_line_width((square.width() + square.height()) * 0.035);
+                cr.move_to(square.tl().x(), square.tl().y());
+                cr.line_to(square.tl().x(), square.br().y());
+                cr.line_to(square.br().x(), square.br().y());
+                cr.line_to(square.br().x(), square.tl().y());
+                cr.line_to(square.tl().x(), square.tl().y());
+                cr.stroke().unwrap();
+                cr.restore().unwrap();
+            }
+
+            let am = available_moves.borrow();
+            if !am.is_empty() {
+                for mv in am.iter() {
+                    let end_pos = mv.get_end_position();
+                    let screen_position = match current_player {
+                        Player::White => (8 - 1 - end_pos.row(), end_pos.col()),
+                        Player::Red => (end_pos.row(), 8 - 1 - end_pos.col()),
+                    };
+                    let square = Rectangle::new(
+                        screen_position.1 as f64 * SQUARE_SIZE,
+                        screen_position.0 as f64 * SQUARE_SIZE,
+                        SQUARE_SIZE,
+                        SQUARE_SIZE,
+                    );
+                    cr.save().unwrap();
+                    cr.new_path();
+                    cr.move_to(square.tl().x(), square.tl().y());
+                    cr.line_to(square.tl().x(), square.br().y());
+                    cr.line_to(square.br().x(), square.br().y());
+                    cr.line_to(square.br().x(), square.tl().y());
+                    cr.line_to(square.tl().x(), square.tl().y());
+                    cr.clip();
+                    cr.new_path();
+                    cr.set_source_rgb(0.0, 1.0, 0.0);
+                    cr.set_line_width((square.width() + square.height()) * 0.035);
+                    cr.move_to(square.tl().x(), square.tl().y());
+                    cr.line_to(square.tl().x(), square.br().y());
+                    cr.line_to(square.br().x(), square.br().y());
+                    cr.line_to(square.br().x(), square.tl().y());
+                    cr.line_to(square.tl().x(), square.tl().y());
+                    cr.stroke().unwrap();
+                    cr.restore().unwrap();
+                }
+            }
+            draw_score_bar(cr, &board, rd.borrow().game(), current_player);
+        });
+    }
+    let gesture = gtk::GestureClick::new();
+
+    // Set the gestures button to the right mouse button (=3)
+    gesture.set_button(GDK_BUTTON_PRIMARY as u32);
+
+    // Assign your handler to an event of the gesture (e.g. the `pressed` event)
+    {
+        let drawing_area = drawing_area.clone();
+        let available_moves = available_moves.clone();
+        let window = window.clone();
+        let undo_btn_clone = undo_button.clone();
+        let redo_btn_clone = redo_button.clone();
+        gesture.connect_pressed(move |gesture, _, x, y| {
+            gesture.set_state(gtk::EventSequenceState::Claimed);
+            if let Some(winner) = rd.borrow().game().winner() {
+                MainContext::default()
+                    .spawn_local(final_dialog::create_dialog(window.clone(), winner));
+            } else {
+                let xform = xform.borrow();
+                let inverse = {
+                    let mut m = *xform;
+                    m.invert();
+                    m
+                };
+                let p = transform_point(&Point::new(x, y), &inverse);
+                if board_clone.contains(&p) {
+                    let p = p - board_clone.tl();
+                    // println!("Point: {:?}", p);
+                    let position = match current_player {
+                        Player::White => Position::new(
+                            (8.0 - (p.y() / SQUARE_SIZE)) as u8,
+                            (p.x() / SQUARE_SIZE) as u8,
+                        ),
+                        Player::Red => Position::new(
+                            (p.y() / SQUARE_SIZE) as u8,
+                            (8.0 - p.x() / SQUARE_SIZE) as u8,
+                        ),
+                    };
+                    // println!("Selected position: {:?}", position);
+                    let piece = {
+                        let rd = rd.borrow();
+                        let draughts_game = rd.game();
+                        position
+                            .clone()
+                            .map_or(Piece::NoPiece, |it| draughts_game.piece_at(it))
+                        // println!("Selected piece: {:?}", piece);
+                    };
+                    let am = available_moves.replace(Vec::new());
+                    let mut move_applied = false;
+                    if !am.is_empty() {
+                        if let Ok(pos) = position {
+                            for mv in am.into_iter() {
+                                if mv.get_end_position() == pos {
+                                    let mut rd_app = rd.borrow_mut();
+                                    // println!("Applied move: {:?}", mv);
+                                    rd_app.apply_move(mv).unwrap();
+                                    // let game_copy = rd_app.game().clone();
+                                    // thread::spawn(move || {
+                                    //     if let (Some(mv), analyzed_moves) =
+                                    //         game_copy.get_best_move(10)
+                                    //     {
+                                    //         println!(
+                                    //             "Next best move: {:?}, analyzed moves: {}",
+                                    //             mv, analyzed_moves
+                                    //         );
+                                    //     }
+                                    // });
+                                    move_applied = true;
+                                    break;
+                                }
+                            }
+                        }
+                        if move_applied {
+                            selected_piece.set(None);
+                            let rd = rd.borrow();
+                            undo_btn_clone.set_sensitive(rd.can_undo());
+                            redo_btn_clone.set_sensitive(rd.can_redo());
+                        }
+                    }
+                    if !move_applied {
+                        let position = position.ok();
+                        match piece.player() {
+                            Some(Player::Red) => selected_piece.set(position),
+                            Some(Player::White) => selected_piece.set(position),
+                            None => selected_piece.set(None),
+                        }
+                        if piece.player().is_none() {
+                            selected_piece.set(None)
+                        } else {
+                            let mut am = available_moves.borrow_mut();
+                            selected_piece.set(position);
+                            if let Some(position) = position {
+                                for mv in rd.borrow().game().moves_for_piece(position) {
+                                    am.push(mv);
+                                }
+                            }
+                        }
+                    }
+                } else {
+                    selected_piece.set(None);
+                }
+                drawing_area.queue_draw();
+            }
+        });
+    }
+    // Assign the gesture to the treeview
+    drawing_area.add_controller(gesture);
+    window.present();
+}
+
+fn on_activate(application: &Application, game: DraughtsGame) {
+    // Initialize GTK before using any GTK functions.
+    if gtk::init().is_err() {
+        panic!("Failed to initialize GTK.");
+    }
+
+    let current_player = new_shared_mut(Player::Red);
+    let dialog = greeting_dialog::create(application, current_player.clone());
+    let application = application.clone();
+    dialog.connect_close_request(move |w| {
+        application.remove_window(w);
+        let rd = new_shared_mut_ref(RDraughtApplication::new(game.clone()));
+        create_game_window(rd.clone(), &application, current_player.get());
+        Propagation::Proceed
+    });
+}
+
+pub fn run(game: DraughtsGame) -> ExitCode {
+    // Create a new application with the builder pattern
+    let app = Application::builder()
+        .application_id("net.woggioni.rdraught")
+        .build();
+    app.connect_activate(move |it| on_activate(it, game.clone()));
+    app.run()
+}

rdraught-pi/Cargo.toml

@@ -1,16 +0,0 @@
-[package]
-name = "rdraught-pi"
-version = "0.1.0"
-edition = "2024"
-authors = ["Walter Oggioni <oggioni.walter@gmail.com>"]
-license = "MIT"
-rust-version = "1.87"
-
-[[bin]]
-name = "hello"
-path = "src/hello.rs"
-
-[dependencies]
-panic-halt = "1.0"
-libc = { version = "0.2", default-features = false }
-

rdraught-pi/src/hello.rs

@@ -1,17 +0,0 @@
-#![no_std]
-#![no_main]
-
-use libc::printf;
-
-extern crate libc;
-extern crate panic_halt;
-
-#[link(name = "c", kind = "static")]
-unsafe extern "C" {}
-
-#[unsafe(no_mangle)]
-pub extern "C" fn main() {
-    unsafe {
-        printf("Hello world!!\n".as_ptr() as *const i8);
-    }
-}

rdraught-sdl/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "rdraught-sdl"
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+version.workspace = true
+
+# [lib]
+# crate-type = ["cdylib"]
+
+[dependencies]
+
+[dependencies.sdl3]
+workspace = true
+features = ["build-from-source-static"]

rdraught-sdl/src/main.rs

@@ -0,0 +1,75 @@
+use core::error::Error;
+use sdl3::event::Event;
+use sdl3::keyboard::Keycode;
+use sdl3::pixels::Color;
+use sdl3::rect::Rect;
+use std::time::Duration;
+
+const WINDOW_WIDTH: u32 = 640;
+const WINDOW_HEIGHT: u32 = 640;
+const BOARD_SIZE: usize = 8;
+const SQUARE_SIZE: u32 = WINDOW_WIDTH / BOARD_SIZE as u32;
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // Initialize SDL
+    let sdl_context = sdl3::init()?;
+    let video_subsystem = sdl_context.video()?;
+
+    // Create window
+    let window = video_subsystem
+        .window("Chessboard", WINDOW_WIDTH, WINDOW_HEIGHT)
+        .position_centered()
+        .build()
+        .map_err(|e| e.to_string())?;
+
+    // Create canvas
+    let mut canvas = window.into_canvas();
+
+    // Set default color
+    canvas.set_draw_color(Color::RGB(255, 255, 255));
+    canvas.clear();
+    canvas.present();
+
+    // Main loop
+    let mut event_pump = sdl_context.event_pump()?;
+    'running: loop {
+        // Handle events
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::Quit { .. }
+                | Event::KeyDown {
+                    keycode: Some(Keycode::Escape),
+                    ..
+                } => break 'running,
+                _ => {}
+            }
+        }
+
+        // Draw chessboard
+        canvas.set_draw_color(Color::RGB(255, 255, 255));
+        canvas.clear();
+
+        for row in 0..BOARD_SIZE {
+            for col in 0..BOARD_SIZE {
+                let color = if (row + col) % 2 == 0 {
+                    Color::RGB(240, 217, 181) // Light squares
+                } else {
+                    Color::RGB(181, 136, 99) // Dark squares
+                };
+
+                canvas.set_draw_color(color);
+                canvas.fill_rect(Rect::new(
+                    (col as u32 * SQUARE_SIZE) as i32,
+                    (row as u32 * SQUARE_SIZE) as i32,
+                    SQUARE_SIZE,
+                    SQUARE_SIZE,
+                ))?;
+            }
+        }
+
+        canvas.present();
+        std::thread::sleep(Duration::new(0, 1_000_000_000u32 / 60));
+    }
+
+    Ok(())
+}

rdraught-ui-common/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "rdraught-ui-common"
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+version.workspace = true
+
+[lib]
+crate-type = ["lib"]
+
+[dependencies]
+rdraught.workspace = true
+rmath.workspace = true

rdraught-ui-common/src/geo2d.rs

@@ -0,0 +1,261 @@
+use rmath::NumericalMatrix;
+use rmath::SMatrix;
+use std::clone::Clone;
+use std::cmp::Eq;
+use std::cmp::PartialEq;
+use std::fmt::Display;
+use std::marker::Copy;
+use std::ops::Add;
+use std::ops::Div;
+use std::ops::Mul;
+use std::ops::Neg;
+use std::ops::Sub;
+
+#[derive(Debug)]
+pub struct Point {
+    x: f64,
+    y: f64,
+}
+
+impl Point {
+    pub fn x(&self) -> f64 {
+        self.x
+    }
+
+    pub fn y(&self) -> f64 {
+        self.y
+    }
+
+    pub fn new(x: f64, y: f64) -> Point {
+        Point { x, y }
+    }
+}
+
+impl Add<Point> for Point {
+    fn add(self, rhs: Point) -> Self::Output {
+        Point {
+            x: self.x() + rhs.x(),
+            y: self.y() + rhs.y(),
+        }
+    }
+    type Output = Point;
+}
+
+impl Sub<Point> for Point {
+    fn sub(self, rhs: Point) -> Self::Output {
+        Point {
+            x: self.x() - rhs.x(),
+            y: self.y() - rhs.y(),
+        }
+    }
+    type Output = Point;
+}
+
+impl Mul<f64> for Point {
+    fn mul(self, rhs: f64) -> Self::Output {
+        Point::new(self.x * rhs, self.y * rhs)
+    }
+    type Output = Point;
+}
+
+impl Div<f64> for Point {
+    fn div(self, rhs: f64) -> Self::Output {
+        Point::new(self.x / rhs, self.y / rhs)
+    }
+    type Output = Point;
+}
+
+impl Neg for Point {
+    fn neg(self) -> Self::Output {
+        Point::new(-self.x(), -self.y())
+    }
+
+    type Output = Point;
+}
+
+impl PartialEq for Point {
+    fn eq(&self, other: &Self) -> bool {
+        self.x.eq(&other.x) && self.y.eq(&other.y)
+    }
+}
+
+impl Eq for Point {}
+
+impl Clone for Point {
+    fn clone(&self) -> Self {
+        *self
+    }
+}
+
+impl Copy for Point {}
+
+impl Display for Point {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Point({}, {})", self.x, self.y)
+    }
+}
+
+impl Point {}
+
+#[derive(Clone)]
+pub struct Rect {
+    tl: Point,
+    br: Point,
+}
+
+impl Rect {
+    pub fn new(tl: Point, br: Point) -> Rect {
+        Rect { tl, br }
+    }
+
+    pub fn from_size(tl: Point, width: f64, height: f64) -> Rect {
+        Rect {
+            tl,
+            br: tl + Point::new(width, height),
+        }
+    }
+
+    pub fn width(&self) -> f64 {
+        self.br.x - self.tl.x
+    }
+
+    pub fn height(&self) -> f64 {
+        self.br.y - self.tl.y
+    }
+
+    pub fn tl(&self) -> Point {
+        self.tl
+    }
+
+    pub fn br(&self) -> Point {
+        self.br
+    }
+
+    pub fn center(&self) -> Point {
+        (self.tl + self.br) / 2.0
+    }
+}
+
+impl Display for Rect {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "Rect({}, {})", self.tl, self.br)
+    }
+}
+
+#[derive(Clone)]
+pub struct Xform(SMatrix<f64, 3, 3>);
+
+impl Xform {
+    pub fn new(xx: f64, xy: f64, yx: f64, yy: f64, tx: f64, ty: f64) -> Xform {
+        Xform(SMatrix::<f64, 3, 3>::new(|pos| match pos {
+            (0, 0) => xx,
+            (0, 1) => yx,
+            (1, 0) => xy,
+            (1, 1) => yy,
+            (2, 0) => tx,
+            (2, 1) => ty,
+            (2, 2) => 1f64,
+            _ => 0f64,
+        }))
+    }
+
+    pub fn rot(alpha: f64) -> Xform {
+        let sa = alpha.sin();
+        let ca = alpha.cos();
+        Xform(SMatrix::<f64, 3, 3>::new(|position| match position {
+            (0, 0) => ca,
+            (1, 1) => ca,
+            (1, 0) => -sa,
+            (0, 1) => sa,
+            (2, 2) => 1f64,
+            _ => 0f64,
+        }))
+    }
+
+    pub fn scale(x: f64, y: f64) -> Xform {
+        Xform(SMatrix::<f64, 3, 3>::new(|position| match position {
+            (0, 0) => x,
+            (1, 1) => y,
+            (2, 2) => 1f64,
+            _ => 0f64,
+        }))
+    }
+
+    pub fn xlate(x: f64, y: f64) -> Xform {
+        Xform(SMatrix::<f64, 3, 3>::new(|position| match position {
+            (0, 0) => 1f64,
+            (1, 1) => 1f64,
+            (2, 2) => 1f64,
+            (2, 0) => x,
+            (2, 1) => y,
+            _ => 0f64,
+        }))
+    }
+
+    pub fn xx(&self) -> f64 {
+        self.0[(0, 0)]
+    }
+
+    pub fn xy(&self) -> f64 {
+        self.0[(1, 0)]
+    }
+
+    pub fn tx(&self) -> f64 {
+        self.0[(2, 0)]
+    }
+
+    pub fn yx(&self) -> f64 {
+        self.0[(1, 0)]
+    }
+
+    pub fn yy(&self) -> f64 {
+        self.0[(1, 1)]
+    }
+
+    pub fn ty(&self) -> f64 {
+        self.0[(2, 1)]
+    }
+
+    pub fn invert(&self) -> Xform {
+        Xform(self.0.clone().invert())
+    }
+}
+
+impl Default for Xform {
+    fn default() -> Self {
+        Xform(SMatrix::<f64, 3, 3>::identity(3))
+    }
+}
+
+impl Mul<&Xform> for Point {
+    fn mul(self, rhs: &Xform) -> Self::Output {
+        Point::new(
+            self.x * rhs.0[(0, 0)] + self.y * rhs.0[(1, 0)] + rhs.0[(2, 0)],
+            self.x * rhs.0[(0, 1)] + self.y * rhs.0[(1, 1)] + rhs.0[(2, 1)],
+        )
+    }
+
+    type Output = Point;
+}
+
+impl Mul<Xform> for Xform {
+    type Output = Xform;
+
+    fn mul(self, rhs: Xform) -> Self::Output {
+        Xform(self.0 * rhs.0)
+    }
+}
+
+impl Mul<&Xform> for &Xform {
+    type Output = Xform;
+
+    fn mul(self, rhs: &Xform) -> Self::Output {
+        Xform(&self.0 * &rhs.0)
+    }
+}
+
+impl Display for Xform {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.fmt(f)
+    }
+}

rdraught-ui-common/src/lib.rs

@@ -0,0 +1,5 @@
+mod geo2d;
+mod types;
+
+pub use geo2d::{Point, Rect, Xform};
+pub use types::{SharedMutable, SharedMutableRef, new_shared_mut, new_shared_mut_ref};

rdraught-ui-common/src/types.rs

@@ -0,0 +1,12 @@
+use std::cell::{Cell, RefCell};
+use std::rc::Rc;
+
+pub type SharedMutable<T> = Rc<Cell<T>>;
+pub type SharedMutableRef<T> = Rc<RefCell<T>>;
+pub fn new_shared_mut_ref<T>(obj: T) -> SharedMutableRef<T> {
+    Rc::new(RefCell::new(obj))
+}
+
+pub fn new_shared_mut<T>(obj: T) -> SharedMutable<T> {
+    Rc::new(Cell::new(obj))
+}

rdraught-ui/src/geo2d.rs

@@ -1,96 +0,0 @@
-use std::clone::Clone;
-use std::cmp::Eq;
-use std::cmp::PartialEq;
-use std::fmt::Display;
-use std::marker::Copy;
-use std::ops::Add;
-use std::ops::Div;
-use std::ops::Mul;
-use std::ops::Neg;
-use std::ops::Sub;
-
-#[derive(Debug)]
-pub struct Point {
-    x: f64,
-    y: f64,
-}
-
-impl Point {
-    pub fn x(&self) -> f64 {
-        self.x
-    }
-
-    pub fn y(&self) -> f64 {
-        self.y
-    }
-
-    pub fn new(x: f64, y: f64) -> Point {
-        Point { x, y }
-    }
-}
-
-impl Add<&Point> for &Point {
-    fn add(self, rhs: &Point) -> Self::Output {
-        Point {
-            x: self.x() + rhs.x(),
-            y: self.y() + rhs.y(),
-        }
-    }
-    type Output = Point;
-}
-
-impl Sub<&Point> for &Point {
-    fn sub(self, rhs: &Point) -> Self::Output {
-        Point {
-            x: self.x() - rhs.x(),
-            y: self.y() - rhs.y(),
-        }
-    }
-    type Output = Point;
-}
-
-impl Mul<f64> for &Point {
-    fn mul(self, rhs: f64) -> Self::Output {
-        Point::new(self.x * rhs, self.y * rhs)
-    }
-    type Output = Point;
-}
-
-impl Div<f64> for &Point {
-    fn div(self, rhs: f64) -> Self::Output {
-        Point::new(self.x / rhs, self.y / rhs)
-    }
-    type Output = Point;
-}
-
-impl Neg for &Point {
-    fn neg(self) -> Self::Output {
-        Point::new(-self.x(), -self.y())
-    }
-
-    type Output = Point;
-}
-
-impl PartialEq for Point {
-    fn eq(&self, other: &Self) -> bool {
-        self.x.eq(&other.x) && self.y.eq(&other.y)
-    }
-}
-
-impl Eq for Point {}
-
-impl Clone for Point {
-    fn clone(&self) -> Self {
-        *self
-    }
-}
-
-impl Copy for Point {}
-
-impl Display for Point {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "Point({}, {})", self.x, self.y)
-    }
-}
-
-impl Point {}

rdraught-ui/src/main.rs

@@ -1,410 +0,0 @@
-use gdk4::cairo::{Context as CairoContext, Matrix, Rectangle};
-use gtk4::cairo::Error;
-use gtk4::{self as gtk, gdk::ffi::GDK_BUTTON_PRIMARY};
-use gtk4::{DrawingArea, prelude::*};
-use rdraught::draughts::{DraughtsBoard, DraughtsGame, Move, Piece, Player};
-use rdraught::position::Position;
-mod geo2d;
-use core::f64::consts::PI;
-use geo2d::Point;
-use rsvg::SvgHandle;
-use std::cell::{Cell, RefCell};
-use std::rc::Rc;
-
-const SQUARE_SIZE: f64 = 1.0;
-
-const CROWN_RED: &[u8] = include_bytes!("crown_red.svg");
-const CROWN_WHITE: &[u8] = include_bytes!("crown_white.svg");
-
-fn transform_point(p: &Point, m: &Matrix) -> Point {
-    let (x, y) = m.transform_point(p.x(), p.y());
-    Point::new(x, y)
-}
-
-trait AugmentedRect {
-    fn from_points(tl: Point, br: Point) -> Rectangle;
-    fn center(&self) -> Point;
-    fn tl(&self) -> Point;
-    fn br(&self) -> Point;
-    fn contains(&self, p: &Point) -> bool;
-}
-
-impl AugmentedRect for Rectangle {
-    fn center(&self) -> Point {
-        Point::new(
-            self.x() + self.width() / 2.0,
-            self.y() + self.height() / 2.0,
-        )
-    }
-
-    fn tl(&self) -> Point {
-        Point::new(self.x(), self.y())
-    }
-
-    fn br(&self) -> Point {
-        Point::new(self.x() + self.width(), self.y() + self.height())
-    }
-
-    fn from_points(tl: Point, br: Point) -> Rectangle {
-        Rectangle::new(tl.x(), tl.y(), br.x() - tl.x(), br.y() - tl.y())
-    }
-
-    fn contains(&self, p: &Point) -> bool {
-        self.x() < p.x()
-            && self.x() + self.width() > p.x()
-            && self.y() < p.y()
-            && self.y() + self.height() > p.y()
-    }
-}
-
-fn draw_piece(
-    cr: &CairoContext,
-    square: &Rectangle,
-    piece: Piece,
-    crown_red: &SvgHandle,
-    crown_white: &SvgHandle,
-) -> Result<(), Error> {
-    if let Piece::NoPiece = piece {
-        Ok(())
-    } else {
-        let center = square.center();
-        let outer_radius = square.width() * 0.3;
-        let vertical_scale_factor = 0.8;
-        let matrix = {
-            let mut m1 = Matrix::identity();
-            m1.translate(0.0, -(center.y() - outer_radius));
-            let mut m2 = Matrix::identity();
-            m2.scale(1.0, vertical_scale_factor);
-            let mut m3 = Matrix::identity();
-            m3.translate(0.0, center.y() - outer_radius * vertical_scale_factor);
-            Matrix::multiply(&Matrix::multiply(&m1, &m2), &m3)
-        };
-        cr.save()?;
-        cr.set_matrix(matrix);
-        cr.set_source_rgb(0.0, 0.0, 0.0);
-        let thickness = outer_radius * 0.3;
-        cr.arc(
-            center.x(),
-            center.y() + thickness / 2.0,
-            outer_radius,
-            0.0,
-            2.0 * PI,
-        );
-        cr.rectangle(
-            center.x() - outer_radius,
-            center.y() - thickness / 2.0,
-            outer_radius * 2.0,
-            thickness,
-        );
-        cr.arc(
-            center.x(),
-            center.y() - thickness / 2.0,
-            outer_radius,
-            0.0,
-            2.0 * PI,
-        );
-        cr.fill().unwrap();
-        let (color, crowned) = match piece {
-            Piece::NoPiece => return Ok(()),
-            Piece::SimpleRedPawn => ((1.0, 0.0, 0.0), false),
-            Piece::SimpleWhitePawn => ((1.0, 1.0, 1.0), false),
-            Piece::CrownedRedPawn => ((1.0, 0.0, 0.0), true),
-            Piece::CrownedWhitePawn => ((1.0, 1.0, 1.0), true),
-        };
-        let radius = square.width() * 0.275;
-        cr.set_source_rgb(color.0, color.1, color.2);
-        cr.arc(
-            center.x(),
-            center.y() - thickness / 2.0,
-            radius,
-            0.0,
-            2.0 * PI,
-        );
-        cr.fill()?;
-        if crowned {
-            let renderer = match piece.player() {
-                Some(Player::Red) => rsvg::CairoRenderer::new(crown_red),
-                Some(Player::White) => rsvg::CairoRenderer::new(crown_white),
-                None => panic!("This should never happen"),
-            };
-            let m4 = {
-                let mut m1 = Matrix::identity();
-                m1.translate(-center.x(), -(center.y() - thickness / 1.0));
-                let mut m2 = Matrix::identity();
-                m2.scale(0.5, 0.5);
-                let mut m3 = Matrix::identity();
-                m3.translate(center.x(), center.y() - thickness / 1.0);
-                Matrix::multiply(&Matrix::multiply(&m1, &m2), &m3)
-            };
-            cr.set_matrix(Matrix::multiply(&matrix, &m4));
-            renderer
-                .render_document(
-                    cr,
-                    &cairo::Rectangle::new(
-                        square.tl().x(),
-                        square.tl().y(),
-                        square.width(),
-                        square.height(),
-                    ),
-                )
-                .unwrap();
-        }
-        cr.restore()?;
-        Ok(())
-    }
-}
-
-fn on_activate(application: &gtk::Application) {
-    // Initialize GTK before using any GTK functions.
-    if gtk::init().is_err() {
-        panic!("Failed to initialize GTK.");
-    }
-    // Create a new window.
-    let window = gtk::ApplicationWindow::builder()
-        .application(application)
-        .title("Rdraught")
-        .default_width(800)
-        .default_height(800)
-        .build();
-
-    // Create a DrawingArea widget where we will draw the chessboard.
-    let drawing_area = Rc::new(RefCell::new(gtk::DrawingArea::new()));
-    // Add the drawing area to the window.
-    window.set_child(Some(drawing_area.borrow().as_ref() as &DrawingArea));
-
-    let draughts_game = Rc::new(RefCell::new(DraughtsGame::default()));
-    let selected_piece: Rc<Cell<Option<Position>>> = Rc::new(Cell::new(None));
-    let available_moves: Rc<RefCell<Vec<Move>>> = Rc::new(RefCell::new(Vec::new()));
-    // Get the allocation information for the widget.
-    let board_width = SQUARE_SIZE * DraughtsBoard::rows() as f64;
-    let board_height = SQUARE_SIZE * DraughtsBoard::columns() as f64;
-    let board = Rectangle::from_points(Point::new(0.0, 0.0), Point::new(board_width, board_height));
-    let board_clone = board;
-    let crown_red_handle = {
-        let stream = gio::MemoryInputStream::from_bytes(&glib::Bytes::from_static(CROWN_RED));
-
-        rsvg::Loader::new()
-            .read_stream(
-                &stream,
-                None::<&gio::File>, // no base file as this document has no references
-                None::<&gio::Cancellable>, // no cancellable
-            )
-            .unwrap()
-    };
-    let crown_white_handle = {
-        let stream = gio::MemoryInputStream::from_bytes(&glib::Bytes::from_static(CROWN_WHITE));
-
-        rsvg::Loader::new()
-            .read_stream(
-                &stream,
-                None::<&gio::File>, // no base file as this document has no references
-                None::<&gio::Cancellable>, // no cancellable
-            )
-            .unwrap()
-    };
-    let xform = Rc::<RefCell<Matrix>>::new(RefCell::new(Matrix::identity()));
-    // Set the "draw" function of the drawing area. This callback is called
-    // whenever GTK needs to redraw this widget (for example, on first display or when resized).
-    {
-        let draughts_game = draughts_game.clone();
-        let xform = xform.clone();
-        let selected_piece = selected_piece.clone();
-        let board_clone = board;
-        let available_moves = available_moves.clone();
-        let get_square_for_position = move |position: &Position, xform: &Matrix| -> Rectangle {
-            let square_size = SQUARE_SIZE;
-
-            let p1 = Point::new(
-                (position.col() as f64) * square_size,
-                ((8 - 1 - position.row()) as f64) * square_size,
-            );
-            let p2 = &p1 + &Point::new(square_size, square_size);
-            let square = Rectangle::from_points(&board_clone.tl() + &p1, &board_clone.tl() + &p2);
-            let tl = transform_point(&square.tl(), xform);
-            let br = transform_point(&square.br(), xform);
-            Rectangle::new(
-                f64::min(tl.x(), br.x()),
-                f64::min(tl.y(), br.y()),
-                f64::abs(tl.x() - br.x()),
-                f64::abs(tl.y() - br.y()),
-            )
-        };
-        drawing_area
-            .borrow_mut()
-            .set_draw_func(move |_widget, cr, width, height| {
-                let screen = Rectangle::from_points(
-                    Point::new(0.0, 0.0),
-                    Point::new(width as f64, height as f64),
-                );
-                let f = f64::min(
-                    screen.width() / board.width(),
-                    screen.height() / board.height(),
-                );
-                let screen_center = screen.center();
-                let board_center = board.center();
-                let mut xform = xform.borrow_mut();
-                *xform = Matrix::multiply(
-                    &Matrix::multiply(
-                        &Matrix::new(1.0, 0.0, 0.0, 1.0, -board_center.x(), -board_center.y()),
-                        &Matrix::new(f, 0.0, 0.0, f, 0.0, 0.0),
-                    ),
-                    &Matrix::new(1.0, 0.0, 0.0, 1.0, screen_center.x(), screen_center.y()),
-                );
-
-                // Loop over rows and columns to draw each chessboard cell.
-                for row in 0..DraughtsBoard::rows() {
-                    for col in 0..DraughtsBoard::columns() {
-                        let position = Position::new((8 - row - 1) as u8, col as u8);
-                        let square = get_square_for_position(&position, &xform);
-                        // Alternate colors based on the sum of row and column indices.
-                        if (row + col) % 2 == 0 {
-                            cr.set_source_rgb(0.8, 0.8, 0.6);
-                        } else {
-                            cr.set_source_rgb(0.4, 0.4, 0.2);
-                        }
-
-                        // Draw and fill the square.
-                        cr.rectangle(
-                            square.tl().x(),
-                            square.tl().y(),
-                            square.width(),
-                            square.height(),
-                        );
-                        cr.fill().unwrap();
-                        draw_piece(
-                            cr,
-                            &square,
-                            draughts_game.borrow().piece_at(position),
-                            &crown_red_handle,
-                            &crown_white_handle,
-                        )
-                        .unwrap();
-                    }
-                }
-                if let Some(selected_postion) = selected_piece.get() {
-                    let square = get_square_for_position(&selected_postion, &xform);
-                    cr.save().unwrap();
-                    cr.new_path();
-                    cr.move_to(square.tl().x(), square.tl().y());
-                    cr.line_to(square.tl().x(), square.br().y());
-                    cr.line_to(square.br().x(), square.br().y());
-                    cr.line_to(square.br().x(), square.tl().y());
-                    cr.line_to(square.tl().x(), square.tl().y());
-                    cr.clip();
-                    cr.new_path();
-                    cr.set_source_rgb(0.0, 0.0, 1.0);
-                    cr.set_line_width((square.width() + square.height()) * 0.05);
-                    cr.move_to(square.tl().x(), square.tl().y());
-                    cr.line_to(square.tl().x(), square.br().y());
-                    cr.line_to(square.br().x(), square.br().y());
-                    cr.line_to(square.br().x(), square.tl().y());
-                    cr.line_to(square.tl().x(), square.tl().y());
-                    cr.stroke().unwrap();
-                    cr.restore().unwrap();
-                }
-
-                let am = available_moves.borrow();
-                if !am.is_empty() {
-                    for mv in am.iter() {
-                        let square = get_square_for_position(&mv.get_end_position(), &xform);
-                        cr.save().unwrap();
-                        cr.new_path();
-                        cr.move_to(square.tl().x(), square.tl().y());
-                        cr.line_to(square.tl().x(), square.br().y());
-                        cr.line_to(square.br().x(), square.br().y());
-                        cr.line_to(square.br().x(), square.tl().y());
-                        cr.line_to(square.tl().x(), square.tl().y());
-                        cr.clip();
-                        cr.new_path();
-                        cr.set_source_rgb(0.0, 1.0, 0.0);
-                        cr.set_line_width((square.width() + square.height()) * 0.05);
-                        cr.move_to(square.tl().x(), square.tl().y());
-                        cr.line_to(square.tl().x(), square.br().y());
-                        cr.line_to(square.br().x(), square.br().y());
-                        cr.line_to(square.br().x(), square.tl().y());
-                        cr.line_to(square.tl().x(), square.tl().y());
-                        cr.stroke().unwrap();
-                        cr.restore().unwrap();
-                    }
-                }
-            });
-    }
-    let gesture = gtk::GestureClick::new();
-
-    // Set the gestures button to the right mouse button (=3)
-    gesture.set_button(GDK_BUTTON_PRIMARY as u32);
-
-    // Assign your handler to an event of the gesture (e.g. the `pressed` event)
-    {
-        let drawing_area = drawing_area.clone();
-        let available_moves = available_moves.clone();
-        gesture.connect_pressed(move |gesture, _, x, y| {
-            gesture.set_state(gtk::EventSequenceState::Claimed);
-            let xform = xform.borrow();
-            let inverse = {
-                let mut m = *xform;
-                m.invert();
-                m
-            };
-            let p = transform_point(&Point::new(x, y), &inverse);
-            if board_clone.contains(&p) {
-                let p = &p - &board_clone.tl();
-                // println!("Point: {:?}", p);
-                let position = Position::new(
-                    8 - 1 - (p.y() / SQUARE_SIZE) as u8,
-                    (p.x() / SQUARE_SIZE) as u8,
-                );
-                // println!("Selected position: {:?}", position);
-                let mut draughts_game = draughts_game.borrow_mut();
-                let piece = draughts_game.piece_at(position);
-                let mut am = available_moves.borrow_mut();
-                let mut move_applied = false;
-                if !am.is_empty() {
-                    for mv in am.iter() {
-                        if mv.get_end_position() == position {
-                            draughts_game.apply_move(mv).unwrap();
-                            move_applied = true;
-                            break;
-                        }
-                    }
-                    if move_applied {
-                        selected_piece.set(None);
-                        am.clear();
-                    }
-                }
-                if !move_applied {
-                    match piece.player() {
-                        Some(Player::Red) => selected_piece.set(Some(position)),
-                        Some(Player::White) => selected_piece.set(Some(position)),
-                        None => selected_piece.set(None),
-                    }
-                    am.clear();
-                    if piece.player().is_none() {
-                        selected_piece.set(None)
-                    } else {
-                        selected_piece.set(Some(position));
-                        for mv in draughts_game.moves_for_piece(position) {
-                            am.push(mv);
-                        }
-                    }
-                }
-            } else {
-                selected_piece.set(None);
-            }
-            drawing_area.borrow_mut().queue_draw();
-        });
-    }
-    // Assign the gesture to the treeview
-    drawing_area.borrow_mut().add_controller(gesture);
-    window.present();
-}
-
-fn main() {
-    // Create a new application with the builder pattern
-    let app = gtk::Application::builder()
-        .application_id("net.woggioni.rdraught")
-        .build();
-    app.connect_activate(on_activate);
-    // Run the application
-    app.run();
-}

rdraught-w4/.cargo/config.toml

@@ -0,0 +1,20 @@
+[build]
+target = "wasm32-unknown-unknown"
+
+[target.wasm32-unknown-unknown]
+rustflags = [
+    "-A", "dead_code",
+
+    # Import memory from WASM-4
+    "-C", "link-arg=--import-memory",
+    "-C", "link-arg=--initial-memory=65536",
+    "-C", "link-arg=--max-memory=65536",
+    # "-C", "link-args=--relocatable",
+
+    # Reserve 2044 bytes of stack space, offset from 6580.
+    # Bump this value, 16-byte aligned, if the framebuffer gets corrupted.
+    "-C", "link-arg=-zstack-size=14752",
+
+    # Not working? https://github.com/rust-lang/rust/issues/46645#issuecomment-423912553
+    # "-C", "link-arg=--global-base=14752",
+]

rdraught-w4/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "rdraught-w4"
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+version.workspace = true
+
+[dependencies]
+wasm4.workspace = true
+wasm4-sys.workspace = true
+rdraught.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
+
+[profile.release]
+opt-level = "z"
+lto = true
+

rdraught-w4/src/lib.rs

@@ -0,0 +1,223 @@
+#![no_main]
+#![no_std]
+
+use rdraught::{DraughtsBoard, DraughtsGame, Piece, Position};
+use wasm4::draw::{Color, DrawIndex, DrawIndices, Framebuffer};
+use wasm4::rt::{Resources, Runtime};
+// use wasm4 as w4;
+use core::arch::wasm32::unreachable;
+use wasm4::sys::DRAW_COLORS;
+use wasm4::trace;
+// mod wasm4;
+
+// use wasm4::{DRAW_COLORS, oval, rect};
+
+// mod palette;
+
+// static mut GAME: DraughtsGame = DraughtsGame::default();
+struct Rdraught_W4 {
+    framebuffer: Framebuffer,
+    game: DraughtsGame,
+}
+
+impl Runtime for Rdraught_W4 {
+    fn start(rs: Resources) -> Self {
+        rs.framebuffer.replace_palette([
+            Color(0x00edeada),
+            Color(0x00c74634),
+            Color(0x005d8d60),
+            Color(0x00100f24),
+        ]);
+        Rdraught_W4 {
+            framebuffer: rs.framebuffer,
+            game: DraughtsGame::default(),
+        }
+    }
+
+    fn update(&mut self) {
+        let indices = DrawIndices::from_array([
+            DrawIndex::Third,
+            DrawIndex::Fourth,
+            DrawIndex::Fourth,
+            DrawIndex::Transparent,
+        ]);
+        unsafe {
+            *DRAW_COLORS = indices.into_u16();
+        }
+
+        self.framebuffer.rect([10, 10], [50, 50]);
+        self.framebuffer.oval([50, 50], [10, 10]);
+        let SQUARE_SIZE = 20u32;
+        for i in 0..8i32 {
+            for j in 0..8i32 {
+                let indices = if (i + j) % 2 == 0 {
+                    DrawIndices::from_array([
+                        DrawIndex::Third,
+                        DrawIndex::Transparent,
+                        DrawIndex::Fourth,
+                        DrawIndex::Transparent,
+                    ])
+                } else {
+                    DrawIndices::from_array([
+                        DrawIndex::Fourth,
+                        DrawIndex::Transparent,
+                        DrawIndex::Fourth,
+                        DrawIndex::Transparent,
+                    ])
+                };
+                unsafe {
+                    *DRAW_COLORS = indices.into_u16();
+                }
+                let tl = [i as i32 * SQUARE_SIZE as i32, j as i32 * SQUARE_SIZE as i32];
+                self.framebuffer.rect(tl, [SQUARE_SIZE, SQUARE_SIZE]);
+
+                let score = self.game.score_for_player(rdraught::Player::Red);
+                // let msg = format!("{}", score);
+                // w4::trace(msg.as_str());
+
+                let piece = self.game.piece_at(Position::new(i as u8, j as u8).unwrap());
+                match piece {
+                    Piece::SimpleWhitePawn => {
+                        let indices = DrawIndices::from_array([
+                            DrawIndex::First,
+                            DrawIndex::Transparent,
+                            DrawIndex::Transparent,
+                            DrawIndex::Transparent,
+                        ]);
+                        unsafe {
+                            *DRAW_COLORS = indices.into_u16();
+                        }
+                        self.framebuffer.oval(tl, [SQUARE_SIZE, SQUARE_SIZE]);
+                    }
+                    Piece::SimpleRedPawn => {
+                        let indices = DrawIndices::from_array([
+                            DrawIndex::Second,
+                            DrawIndex::Transparent,
+                            DrawIndex::Transparent,
+                            DrawIndex::Transparent,
+                        ]);
+                        unsafe {
+                            *DRAW_COLORS = indices.into_u16();
+                        }
+                        self.framebuffer.oval(tl, [SQUARE_SIZE, SQUARE_SIZE]);
+                    }
+                    Piece::CrownedRedPawn => {}
+                    Piece::CrownedWhitePawn => {}
+                    Piece::NoPiece => {}
+                }
+            }
+        }
+    }
+}
+
+wasm4::main! { Rdraught_W4 }
+
+// use wasm4::*;
+// use wasm4_sys;
+
+// #[unsafe(no_mangle)]
+// fn update() {
+//     unsafe {
+//         wasm4_sys::rect(10, 10, 32, 32);
+//     }
+// }
+// #[unsafe(no_mangle)]
+// fn start() {
+//     palette::change_palette(0usize);
+//     palette::set_draw_color(2u16);
+// }
+
+// #[unsafe(no_mangle)]
+// fn update() {
+//     // if self.count % 60 == 0 {
+//     //     w4::trace("tick");
+//     //     self.count = 0;
+//     // }
+//     // self.count += 1;
+//     // let indices = DrawIndices::from_array([
+//     //     DrawIndex::Third,
+//     //     DrawIndex::Fourth,
+//     //     DrawIndex::Fourth,
+//     //     DrawIndex::Transparent,
+//     // ]);
+//     // unsafe {
+//     //     *DRAW_COLORS = 0x;
+//     // }
+//     palette::set_draw_color([3, 4, 4, 0]);
+
+//     rect(10, 10, 50, 50);
+//     oval(50, 50, 10, 10);
+//     let SQUARE_SIZE = 20u32;
+//     for i in 0..8i32 {
+//         for j in 0..8i32 {
+//             // let indices = if (i + j) % 2 == 0 {
+//             //     DrawIndices::from_array([
+//             //         DrawIndex::Third,
+//             //         DrawIndex::Transparent,
+//             //         DrawIndex::Fourth,
+//             //         DrawIndex::Transparent,
+//             //     ])
+//             // } else {
+//             //     DrawIndices::from_array([
+//             //         DrawIndex::Fourth,
+//             //         DrawIndex::Transparent,
+//             //         DrawIndex::Fourth,
+//             //         DrawIndex::Transparent,
+//             //     ])
+//             // };
+//             // unsafe {
+//             //     *DRAW_COLORS = indices.into_u16();
+//             // }
+//             let tl = [i as i32 * SQUARE_SIZE as i32, j as i32 * SQUARE_SIZE as i32];
+//             rect(tl.0, tl.1, SQUARE_SIZE, SQUARE_SIZE);
+
+//             // let score = self.game.score_for_player(rdraught::Player::Red);
+//             // let msg = format!("{}", score);
+//             // w4::trace(msg.as_str());
+//             unsafe {
+//                 let piece = GAME.piece_at(Position::new(i as u8, j as u8).unwrap());
+//                 match piece {
+//                     Piece::SimpleWhitePawn => {
+//                         // let indices = DrawIndices::from_array([
+//                         //     DrawIndex::First,
+//                         //     DrawIndex::Transparent,
+//                         //     DrawIndex::Transparent,
+//                         //     DrawIndex::Transparent,
+//                         // ]);
+//                         // unsafe {
+//                         //     *DRAW_COLORS = indices.into_u16();
+//                         // }
+//                         oval(tl, [SQUARE_SIZE, SQUARE_SIZE]);
+//                     }
+//                     Piece::SimpleRedPawn => {
+//                         // let indices = DrawIndices::from_array([
+//                         //     DrawIndex::Second,
+//                         //     DrawIndex::Transparent,
+//                         //     DrawIndex::Transparent,
+//                         //     DrawIndex::Transparent,
+//                         // ]);
+//                         // unsafe {
+//                         //     *DRAW_COLORS = indices.into_u16();
+//                         // }
+//                         oval(tl, [SQUARE_SIZE, SQUARE_SIZE]);
+//                     }
+//                     Piece::CrownedRedPawn => {}
+//                     Piece::CrownedWhitePawn => {}
+//                     Piece::NoPiece => {}
+//                 }
+//             }
+//         }
+//     }
+// }
+
+#[panic_handler]
+fn panic_handler(_panic_info: &core::panic::PanicInfo<'_>) -> ! {
+    trace("panic error");
+
+    #[cfg(debug_assertions)]
+    if let Some(cause) = _panic_info.payload().downcast_ref::<&str>() {
+        trace(cause);
+    }
+
+    unreachable()
+}

rdraught-w4/src/palette.rs

@@ -0,0 +1,29 @@
+use super::wasm4::DRAW_COLORS;
+use super::wasm4::PALETTE;
+
+type Palette = [u32; 4];
+
+pub const W4_DEFAULT: Palette = [0xe0f8cf, 0x86c06c, 0x306850, 0x071821];
+
+pub const PONG_OG: Palette = [0x1b1b1b, 0xdcdcdc, 0x1b1b1b, 0xdcdcdc];
+
+pub const ICE_CREAM_GB: Palette = [0xfff6d3, 0xf9a875, 0xeb6b6f, 0x7c3f58];
+
+pub const HOLLOW: Palette = [0x0f0f1b, 0x565a75, 0xc5b7be, 0xf9fbf5];
+
+const PALETTES: [Palette; 4] = [PONG_OG, ICE_CREAM_GB, HOLLOW, W4_DEFAULT];
+
+#[inline]
+fn palette_by_idx<T: Into<usize>>(idx: T) -> Palette {
+    PALETTES[idx.into() % PALETTES.len()]
+}
+
+pub fn change_palette<T: Into<usize>>(idx: T) {
+    unsafe {
+        *PALETTE = palette_by_idx(idx);
+    }
+}
+
+pub fn set_draw_color<T: Into<u16>>(idx: T) {
+    unsafe { *DRAW_COLORS = idx.into() }
+}

rdraught-w4/src/wasm4.rs

@@ -0,0 +1,196 @@
+//
+// WASM-4: https://wasm4.org/docs
+
+// ┌───────────────────────────────────────────────────────────────────────────┐
+// │                                                                           │
+// │ Platform Constants                                                        │
+// │                                                                           │
+// └───────────────────────────────────────────────────────────────────────────┘
+
+pub const SCREEN_SIZE: u32 = 160;
+pub const FONT_SIZE: u32 = 8;
+
+// ┌───────────────────────────────────────────────────────────────────────────┐
+// │                                                                           │
+// │ Memory Addresses                                                          │
+// │                                                                           │
+// └───────────────────────────────────────────────────────────────────────────┘
+
+pub static mut PALETTE: *mut [u32; 4] = 0x04 as *mut [u32; 4];
+pub const DRAW_COLORS: *mut u16 = 0x14 as *mut u16;
+pub const GAMEPAD1: *const u8 = 0x16 as *const u8;
+pub const GAMEPAD2: *const u8 = 0x17 as *const u8;
+pub const GAMEPAD3: *const u8 = 0x18 as *const u8;
+pub const GAMEPAD4: *const u8 = 0x19 as *const u8;
+pub const MOUSE_X: *const i16 = 0x1a as *const i16;
+pub const MOUSE_Y: *const i16 = 0x1c as *const i16;
+pub const MOUSE_BUTTONS: *const u8 = 0x1e as *const u8;
+pub static mut FRAMEBUFFER: *mut [u8; 6400] = 0xa0 as *mut [u8; 6400];
+
+pub const BUTTON_1: u8 = 1;
+pub const BUTTON_2: u8 = 2;
+pub const BUTTON_LEFT: u8 = 16;
+pub const BUTTON_RIGHT: u8 = 32;
+pub const BUTTON_UP: u8 = 64;
+pub const BUTTON_DOWN: u8 = 128;
+
+// ┌───────────────────────────────────────────────────────────────────────────┐
+// │                                                                           │
+// │ Drawing Functions                                                         │
+// │                                                                           │
+// └───────────────────────────────────────────────────────────────────────────┘
+
+/// Copies pixels to the framebuffer.
+pub fn blit(sprite: &[u8], x: i32, y: i32, width: u32, height: u32, flags: u32) {
+    unsafe { extern_blit(sprite.as_ptr(), x, y, width, height, flags) }
+}
+extern "C" {
+    #[link_name = "blit"]
+    fn extern_blit(sprite: *const u8, x: i32, y: i32, width: u32, height: u32, flags: u32);
+}
+
+/// Copies a subregion within a larger sprite atlas to the framebuffer.
+pub fn blit_sub(
+    sprite: &[u8],
+    x: i32,
+    y: i32,
+    width: u32,
+    height: u32,
+    src_x: u32,
+    src_y: u32,
+    stride: u32,
+    flags: u32,
+) {
+    unsafe {
+        extern_blit_sub(
+            sprite.as_ptr(),
+            x,
+            y,
+            width,
+            height,
+            src_x,
+            src_y,
+            stride,
+            flags,
+        )
+    }
+}
+extern "C" {
+    #[link_name = "blitSub"]
+    fn extern_blit_sub(
+        sprite: *const u8,
+        x: i32,
+        y: i32,
+        width: u32,
+        height: u32,
+        src_x: u32,
+        src_y: u32,
+        stride: u32,
+        flags: u32,
+    );
+}
+
+pub const BLIT_2BPP: u32 = 1;
+pub const BLIT_1BPP: u32 = 0;
+pub const BLIT_FLIP_X: u32 = 2;
+pub const BLIT_FLIP_Y: u32 = 4;
+pub const BLIT_ROTATE: u32 = 8;
+
+/// Draws a line between two points.
+pub fn line(x1: i32, y1: i32, x2: i32, y2: i32) {
+    unsafe { extern_line(x1, y1, x2, y2) }
+}
+extern "C" {
+    #[link_name = "line"]
+    fn extern_line(x1: i32, y1: i32, x2: i32, y2: i32);
+}
+
+/// Draws an oval (or circle).
+pub fn oval(x: i32, y: i32, width: u32, height: u32) {
+    unsafe { extern_oval(x, y, width, height) }
+}
+extern "C" {
+    #[link_name = "oval"]
+    fn extern_oval(x: i32, y: i32, width: u32, height: u32);
+}
+
+/// Draws a rectangle.
+pub fn rect(x: i32, y: i32, width: u32, height: u32) {
+    unsafe { extern_rect(x, y, width, height) }
+}
+extern "C" {
+    #[link_name = "rect"]
+    fn extern_rect(x: i32, y: i32, width: u32, height: u32);
+}
+
+/// Draws text using the built-in system font.
+pub fn text(text: &str, x: i32, y: i32) {
+    unsafe { extern_text(text.as_ptr(), text.len(), x, y) }
+}
+extern "C" {
+    #[link_name = "textUtf8"]
+    fn extern_text(text: *const u8, length: usize, x: i32, y: i32);
+}
+
+// ┌───────────────────────────────────────────────────────────────────────────┐
+// │                                                                           │
+// │ Sound Functions                                                           │
+// │                                                                           │
+// └───────────────────────────────────────────────────────────────────────────┘
+
+/// Plays a sound tone.
+pub fn tone(frequency: u32, duration: u32, volume: u32, flags: u32) {
+    unsafe { extern_tone(frequency, duration, volume, flags) }
+}
+extern "C" {
+    #[link_name = "tone"]
+    fn extern_tone(frequency: u32, duration: u32, volume: u32, flags: u32);
+}
+
+pub const TONE_PULSE1: u32 = 0;
+pub const TONE_PULSE2: u32 = 1;
+pub const TONE_TRIANGLE: u32 = 2;
+pub const TONE_NOISE: u32 = 3;
+pub const TONE_MODE1: u32 = 0;
+pub const TONE_MODE2: u32 = 4;
+pub const TONE_MODE3: u32 = 8;
+pub const TONE_MODE4: u32 = 12;
+
+// ┌───────────────────────────────────────────────────────────────────────────┐
+// │                                                                           │
+// │ Storage Functions                                                         │
+// │                                                                           │
+// └───────────────────────────────────────────────────────────────────────────┘
+
+extern "C" {
+    /// Reads up to `size` bytes from persistent storage into the pointer `dest`.
+    pub fn diskr(dest: *mut u8, size: u32) -> u32;
+
+    /// Writes up to `size` bytes from the pointer `src` into persistent storage.
+    pub fn diskw(src: *const u8, size: u32) -> u32;
+}
+
+// ┌───────────────────────────────────────────────────────────────────────────┐
+// │                                                                           │
+// │ Other Functions                                                           │
+// │                                                                           │
+// └───────────────────────────────────────────────────────────────────────────┘
+
+extern "C" {
+    /// Copies `size` bytes from `srcPtr` into `destPtr`.
+    #[link_name = "memcpy"]
+    pub fn memcpy(dest: *mut u8, src: *const u8, size: usize) -> usize;
+
+    /// Fills memory at `destPtr` with `size` bytes of the fixed value `value`.
+    #[link_name = "memset"]
+    pub fn memset(dest: *mut u8, byte: u8, size: usize) -> usize;
+}
+
+/// Prints a message to the debug console.
+pub fn trace(text: &str) {
+    unsafe { extern_trace(text.as_ptr(), text.len()) }
+}
+extern "C" {
+    #[link_name = "traceUtf8"]
+    fn extern_trace(trace: *const u8, length: usize);
+}

rdraught-wasm/.cargo/config.toml

@@ -0,0 +1,3 @@
+[build]
+target = "wasm32-unknown-unknown"
+

rdraught-wasm/Cargo.toml

@@ -0,0 +1,39 @@
+[package]
+name = "rdraught-wasm"
+authors.workspace = true
+edition.workspace = true
+homepage.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+version.workspace = true
+
+# [lib]
+# crate-type = ["cdylib"]
+
+[dependencies]
+rdraught.workspace = true
+rdraught-ui-common.workspace = true
+wasm-bindgen.workspace = true
+console_error_panic_hook.workspace = true
+rmath.workspace = true
+base64.workspace = true
+
+
+[dependencies.web-sys]
+workspace = true
+features = [
+  'DomMatrix',
+  'CanvasRenderingContext2d',
+  'CssStyleDeclaration',
+  'Document',
+  'Element',
+  'EventTarget',
+  'HtmlCanvasElement',
+  'HtmlElement',
+  'MouseEvent',
+  'Node',
+  'HtmlImageElement',
+  'SvgImageElement',
+  'Window',
+]

rdraught-wasm/dist/index.html

@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
+  <style>
+    body {
+      margin: 0px;
+    }
+  </style>
+<link rel="modulepreload" href="/rdraught-wasm-1d648b9090e33d1f.js" crossorigin="anonymous" integrity="sha384-T7IqpVlu6X9Lrf6TI9E2mHL6bPl2B4DHWKUGmbtsfGa1QSmnJBFB8IRe7clx0yWb"><link rel="preload" href="/rdraught-wasm-1d648b9090e33d1f_bg.wasm" crossorigin="anonymous" integrity="sha384-v+/7HPNa68RnAHRmXFFl7L7bUCWjUJnc8AGKHfn6l5NJiPANQ7yqdGRb+abf1wyh" as="fetch" type="application/wasm"></head>
+
+<body>
+
+<script type="module">
+import init, * as bindings from '/rdraught-wasm-1d648b9090e33d1f.js';
+const wasm = await init({ module_or_path: '/rdraught-wasm-1d648b9090e33d1f_bg.wasm' });
+
+
+window.wasmBindings = bindings;
+
+
+dispatchEvent(new CustomEvent("TrunkApplicationStarted", {detail: {wasm}}));
+
+</script></body>
+
+</html>

rdraught-wasm/index.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
+  <style>
+    body {
+      margin: 0px;
+    }
+  </style>
+</head>
+
+<body>
+</body>
+
+</html>

rdraught-wasm/src/crown_red.svg

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+    <g style="fill:none; fill-opacity:0; fill-rule:evenodd; stroke:#ffc837; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0)">
+        <path
+        d="M 22.5,11.63 L 22.5,6"
+        style="fill:none; stroke:#ffc837; stroke-linejoin:miter;" />
+        <path
+        d="M 20,8 L 25,8"
+        style="fill:none; stroke:#ffc837; stroke-linejoin:miter;" />
+        <path
+        d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25"
+        style="fill:#ffffff; stroke:#ffc837; stroke-linecap:butt; stroke-linejoin:miter;" />
+        <path
+        d="M 11.5,37 C 17,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 19,16 9.5,13 6.5,19.5 C 3.5,25.5 11.5,29.5 11.5,29.5 L 11.5,37 z "
+        style="fill:#ffffff; stroke:#ffc837;" />
+        <path
+        d="M 11.5,30 C 17,27 27,27 32.5,30"
+        style="fill:none; stroke:#ffc837;" />
+        <path
+        d="M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5"
+        style="fill:none; stroke:#ffc837;" />
+        <path
+        d="M 11.5,37 C 17,34 27,34 32.5,37"
+        style="fill:none; stroke:#ffc837;" />
+    </g>    
+</svg>

rdraught-wasm/src/crown_white.svg

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45">
+    <g style="fill:none; fill-opacity:0; fill-rule:evenodd; stroke:#776b00; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;" transform="translate(0,0)">
+        <path
+        d="M 22.5,11.63 L 22.5,6"
+        style="fill:none; stroke:#776b00; stroke-linejoin:miter;" />
+        <path
+        d="M 20,8 L 25,8"
+        style="fill:none; stroke:#776b00; stroke-linejoin:miter;" />
+        <path
+        d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25"
+        style="fill:#ffffff; stroke:#776b00; stroke-linecap:butt; stroke-linejoin:miter;" />
+        <path
+        d="M 11.5,37 C 17,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 19,16 9.5,13 6.5,19.5 C 3.5,25.5 11.5,29.5 11.5,29.5 L 11.5,37 z "
+        style="fill:#ffffff; stroke:#776b00;" />
+        <path
+        d="M 11.5,30 C 17,27 27,27 32.5,30"
+        style="fill:none; stroke:#776b00;" />
+        <path
+        d="M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5"
+        style="fill:none; stroke:#776b00;" />
+        <path
+        d="M 11.5,37 C 17,34 27,34 32.5,37"
+        style="fill:none; stroke:#776b00;" />
+    </g>    
+</svg>

rdraught-wasm/src/lib.rs

@@ -0,0 +1,61 @@
+use std::cell::Cell;
+use std::rc::Rc;
+use wasm_bindgen::prelude::*;
+
+use web_sys::CanvasRenderingContext2d;
+use web_sys::MouseEvent;
+extern crate console_error_panic_hook;
+
+// #[wasm_bindgen(start)]
+fn main() -> Result<(), JsValue> {
+    let document = web_sys::window().unwrap().document().unwrap();
+    let canvas = document
+        .create_element("canvas")?
+        .dyn_into::<web_sys::HtmlCanvasElement>()?;
+    document.body().unwrap().append_child(&canvas)?;
+    canvas.set_width(640);
+    canvas.set_height(480);
+    canvas.style().set_property("border", "solid")?;
+    let context = canvas
+        .get_context("2d")?
+        .unwrap()
+        .dyn_into::<web_sys::CanvasRenderingContext2d>()?;
+    let context = Rc::new(context);
+    let pressed = Rc::new(Cell::new(false));
+    {
+        let context = context.clone();
+        let pressed = pressed.clone();
+        let closure = Closure::<dyn FnMut(_)>::new(move |event: web_sys::MouseEvent| {
+            context.begin_path();
+            context.move_to(event.offset_x() as f64, event.offset_y() as f64);
+            pressed.set(true);
+        });
+        canvas.add_event_listener_with_callback("mousedown", closure.as_ref().unchecked_ref())?;
+        closure.forget();
+    }
+    {
+        let context = context.clone();
+        let pressed = pressed.clone();
+        let closure = Closure::<dyn FnMut(_)>::new(move |event: web_sys::MouseEvent| {
+            if pressed.get() {
+                context.line_to(event.offset_x() as f64, event.offset_y() as f64);
+                context.stroke();
+                context.begin_path();
+                context.move_to(event.offset_x() as f64, event.offset_y() as f64);
+            }
+        });
+        canvas.add_event_listener_with_callback("mousemove", closure.as_ref().unchecked_ref())?;
+        closure.forget();
+    }
+    {
+        let closure = Closure::<dyn FnMut(_)>::new(move |event: web_sys::MouseEvent| {
+            pressed.set(false);
+            context.line_to(event.offset_x() as f64, event.offset_y() as f64);
+            context.stroke();
+        });
+        canvas.add_event_listener_with_callback("mouseup", closure.as_ref().unchecked_ref())?;
+        closure.forget();
+    }
+
+    Ok(())
+}

rdraught-wasm/src/main.rs

@@ -0,0 +1,446 @@
+use base64::Engine;
+use base64::engine::general_purpose::STANDARD as b64;
+use core::f64::consts::PI;
+use rdraught::{DraughtsBoard, DraughtsGame, Move, Piece, Player, Position, RectangularBoard};
+use rdraught_ui_common::{
+    Point, Rect, SharedMutable, SharedMutableRef, Xform, new_shared_mut, new_shared_mut_ref,
+};
+use wasm_bindgen::prelude::*;
+use web_sys::{CanvasRenderingContext2d, Document, HtmlImageElement, MouseEvent};
+
+extern crate console_error_panic_hook;
+
+#[wasm_bindgen]
+extern "C" {
+    // Use `js_namespace` here to bind `console.log(..)` instead of just
+    // `log(..)`
+    #[wasm_bindgen(js_namespace = console)]
+    fn log(s: &str);
+
+    // The `console.log` is quite polymorphic, so we can bind it with multiple
+    // signatures. Note that we need to use `js_name` to ensure we always call
+    // `log` in JS.
+    #[wasm_bindgen(js_namespace = console, js_name = log)]
+    fn log_u32(a: u32);
+
+    // Multiple arguments too!
+    #[wasm_bindgen(js_namespace = console, js_name = log)]
+    fn log_many(a: &str, b: &str);
+}
+
+macro_rules! console_log {
+    // Note that this is using the `log` function imported above during
+    // `bare_bones`
+    ($($t:tt)*) => (log(&format_args!($($t)*).to_string()))
+}
+
+struct PieceDrawer {
+    red_crown: HtmlImageElement,
+    white_crown: HtmlImageElement,
+}
+
+impl PieceDrawer {
+    fn new(document: &Document) -> Result<PieceDrawer, JsValue> {
+        const CROWN_RED: &[u8] = include_bytes!("crown_red.svg");
+        const CROWN_WHITE: &[u8] = include_bytes!("crown_white.svg");
+        let red_crown = document
+            .create_element("img")?
+            .dyn_into::<HtmlImageElement>()?;
+        let src = b64.encode(CROWN_RED);
+        let src = format!("data:image/svg+xml;base64,{}", src);
+        red_crown.set_src(&src);
+        let white_crown = document
+            .create_element("img")?
+            .dyn_into::<HtmlImageElement>()?;
+        let src = b64.encode(CROWN_WHITE);
+        let src = format!("data:image/svg+xml;base64,{}", src);
+        white_crown.set_src(&src);
+        Ok(PieceDrawer {
+            red_crown,
+            white_crown,
+        })
+    }
+
+    fn draw_piece(
+        &self,
+        ctx: &CanvasRenderingContext2d,
+        xform: &Xform,
+        cell: Rect,
+        piece: Piece,
+    ) -> Result<(), JsValue> {
+        ctx.save();
+        let center = cell.center();
+        let outer_radius = cell.width() * 0.3;
+        let thickness = outer_radius * 0.5;
+        let vertical_scale_factor = 0.7;
+        {
+            let p = Point::new(0.0, cell.center().y()) * xform;
+            let xform = xform.clone()
+                * Xform::xlate(-p.x(), -p.y())
+                * Xform::scale(1.0, vertical_scale_factor)
+                * Xform::xlate(p.x(), p.y());
+            apply_xform(ctx, &xform)?;
+        }
+
+        ctx.set_fill_style_str("#000");
+        ctx.begin_path();
+
+        ctx.arc(
+            center.x(),
+            center.y() + thickness / 2.0,
+            outer_radius,
+            0.0,
+            PI,
+        )?;
+        ctx.line_to(center.x() - outer_radius, center.y() - thickness / 2.0);
+        ctx.arc(
+            center.x(),
+            center.y() - thickness / 2.0,
+            outer_radius,
+            PI,
+            2.0 * PI,
+        )?;
+        ctx.line_to(center.x() + outer_radius, center.y() + thickness / 2.0);
+        ctx.fill();
+
+        match piece.player() {
+            Some(Player::Red) => {
+                ctx.set_fill_style_str("#ff0000");
+            }
+            Some(Player::White) => {
+                ctx.set_fill_style_str("#ffffff");
+            }
+            None => {}
+        }
+        let radius = cell.width() * 0.275;
+        ctx.begin_path();
+        ctx.arc(
+            center.x(),
+            center.y() - thickness / 2.0,
+            radius,
+            0.0,
+            2.0 * PI,
+        )?;
+        ctx.fill();
+        ctx.restore();
+        ctx.save();
+        if let Some(player) = piece.player() {
+            if piece.is_crowned() {
+                {
+                    let p = Point::new(cell.center().x(), cell.center().y()) * xform;
+                    let f = 0.55;
+                    let xform = xform.clone()
+                        * Xform::xlate(-p.x(), -p.y())
+                        * Xform::scale(1.0, vertical_scale_factor)
+                        * Xform::scale(f, f)
+                        * Xform::xlate(p.x(), p.y());
+                    apply_xform(ctx, &xform)?;
+                }
+                let image = match player {
+                    Player::White => self.white_crown.clone(),
+                    Player::Red => self.red_crown.clone(),
+                };
+                ctx.draw_image_with_html_image_element_and_dw_and_dh(
+                    &image,
+                    cell.tl().x(),
+                    cell.tl().y() - thickness / 1.0,
+                    cell.width(),
+                    cell.height(),
+                )?;
+            }
+        }
+        ctx.restore();
+        Ok(())
+    }
+}
+
+fn apply_xform(ctx: &CanvasRenderingContext2d, xform: &Xform) -> Result<(), JsValue> {
+    ctx.set_transform(
+        xform.xx(),
+        xform.xy(),
+        xform.yx(),
+        xform.yy(),
+        xform.tx(),
+        xform.ty(),
+    )
+}
+
+fn from_ctx(ctx: &CanvasRenderingContext2d) -> Result<Xform, JsValue> {
+    let m = ctx.get_transform()?;
+    Ok(Xform::new(m.a(), m.c(), m.b(), m.d(), m.e(), m.f()))
+}
+
+fn map_row(current_player: Player, row: usize) -> usize {
+    match current_player {
+        Player::White => DraughtsBoard::rows() - 1 - row,
+        Player::Red => row,
+    }
+}
+
+trait Agent {}
+
+struct App {
+    game: DraughtsGame,
+    board: Rect,
+    screen: Rect,
+    xform: Xform,
+    selected_piece: Option<Position>,
+    available_moves: Vec<Move>,
+    main_player: Player,
+    red_agent: Box<dyn Agent>,
+    white_agent: Box<dyn Agent>,
+}
+
+struct Human {}
+
+impl Human {
+    fn new() -> Human {
+        Human {}
+    }
+}
+
+impl Agent for Human {}
+
+impl Default for App {
+    fn default() -> Self {
+        let board = Rect::from_size(
+            Point::new(100.0, 400.0),
+            App::SQUARE_SIZE * DraughtsBoard::columns() as f64,
+            App::SQUARE_SIZE * DraughtsBoard::rows() as f64,
+        );
+        App {
+            game: DraughtsGame::default(),
+            board,
+            screen: Rect::new(Point::new(0.0, 0.0), Point::new(0.0, 0.0)),
+            xform: Xform::default(),
+            selected_piece: None,
+            available_moves: Vec::new(),
+            main_player: Player::White,
+            red_agent: Box::new(Human::new()),
+            white_agent: Box::new(Human::new()),
+        }
+    }
+}
+
+impl App {
+    const SQUARE_SIZE: f64 = 100.0;
+    fn draw(
+        &mut self,
+        ctx: &CanvasRenderingContext2d,
+        piece_drawer: &PieceDrawer,
+    ) -> Result<(), JsValue> {
+        ctx.clear_rect(0.0, 0.0, self.screen.width(), self.screen.height());
+        let board = &self.board;
+        let f = f64::min(
+            self.screen.width() / board.width(),
+            self.screen.height() / board.height(),
+        );
+        ctx.save();
+        self.xform = Xform::default()
+            * Xform::xlate(-board.center().x(), -board.center().y())
+            * Xform::scale(f, f)
+            * Xform::xlate(self.screen.center().x(), self.screen.center().y());
+        apply_xform(ctx, &self.xform)?;
+        // let board_center = board.center();
+        // let screen_center = screen.center();
+        // let xlate = -board_center;
+        // ctx.restore();
+        // ctx.translate(-xlate.x(), -xlate.y())?;
+        // ctx.scale(f, f)?;
+        // ctx.translate(screen_center.x(), screen_center.y())?;
+        // console_log!("xform2: {}", from_ctx(ctx)?);
+        let available_moves: Vec<Position> = self
+            .available_moves
+            .iter()
+            .map(Move::get_end_position)
+            .collect();
+        for i in 0..DraughtsBoard::rows() {
+            for j in 0..DraughtsBoard::columns() {
+                let cell = Rect::new(
+                    Point::new(
+                        board.tl().x() + i as f64 * App::SQUARE_SIZE,
+                        board.tl().y() + j as f64 * App::SQUARE_SIZE,
+                    ),
+                    Point::new(
+                        board.tl().x() + (i + 1) as f64 * App::SQUARE_SIZE,
+                        board.tl().y() + (j + 1) as f64 * App::SQUARE_SIZE,
+                    ),
+                );
+                if (i + j) % 2 == 0 {
+                    ctx.set_fill_style_str("#cccc99");
+                } else {
+                    ctx.set_fill_style_str("#666633");
+                }
+                ctx.fill_rect(cell.tl().x(), cell.tl().y(), cell.width(), cell.height());
+                if (i + j) % 2 != 0 {
+                    let current_player = Player::White;
+                    let position = Position::from_index((map_row(current_player, j), i));
+                    let piece = self.game.piece_at(position);
+                    if piece.is_present() {
+                        piece_drawer.draw_piece(ctx, &self.xform, cell.clone(), piece)?;
+                    }
+                    if let Some(selected_piece) = self.selected_piece {
+                        if selected_piece == position {
+                            // console_log!("Selected: {}", selected_piece);
+                            ctx.save();
+                            ctx.set_shadow_blur(300.0);
+                            ctx.set_shadow_color("#ffffff");
+                            ctx.begin_path();
+                            ctx.move_to(cell.tl().x(), cell.tl().y());
+                            ctx.line_to(cell.br().x(), cell.tl().y());
+                            ctx.line_to(cell.br().x(), cell.br().y());
+                            ctx.line_to(cell.tl().x(), cell.br().y());
+                            ctx.line_to(cell.tl().x(), cell.tl().y());
+                            ctx.clip();
+                            ctx.set_stroke_style_str("#fff");
+                            ctx.set_line_width(4.0);
+                            ctx.begin_path();
+                            ctx.move_to(board.tl().x(), board.tl().y());
+                            ctx.line_to(board.br().x(), board.tl().y());
+                            ctx.line_to(board.br().x(), board.br().y());
+                            ctx.line_to(board.tl().x(), board.br().y());
+                            ctx.line_to(board.tl().x(), board.tl().y());
+                            ctx.move_to(cell.tl().x(), cell.tl().y());
+                            ctx.line_to(cell.br().x(), cell.tl().y());
+                            ctx.line_to(cell.br().x(), cell.br().y());
+                            ctx.line_to(cell.tl().x(), cell.br().y());
+                            ctx.line_to(cell.tl().x(), cell.tl().y());
+                            ctx.stroke();
+                            ctx.restore();
+                        }
+                    }
+                    if available_moves.contains(&position) {
+                        ctx.save();
+                        ctx.set_shadow_blur(300.0);
+                        ctx.set_shadow_color("#0000ff");
+                        ctx.begin_path();
+                        ctx.move_to(cell.tl().x(), cell.tl().y());
+                        ctx.line_to(cell.br().x(), cell.tl().y());
+                        ctx.line_to(cell.br().x(), cell.br().y());
+                        ctx.line_to(cell.tl().x(), cell.br().y());
+                        ctx.line_to(cell.tl().x(), cell.tl().y());
+                        ctx.clip();
+                        ctx.set_stroke_style_str("#0f0");
+                        ctx.set_line_width(4.0);
+                        ctx.begin_path();
+                        ctx.move_to(board.tl().x(), board.tl().y());
+                        ctx.line_to(board.br().x(), board.tl().y());
+                        ctx.line_to(board.br().x(), board.br().y());
+                        ctx.line_to(board.tl().x(), board.br().y());
+                        ctx.line_to(board.tl().x(), board.tl().y());
+                        ctx.move_to(cell.tl().x(), cell.tl().y());
+                        ctx.line_to(cell.br().x(), cell.tl().y());
+                        ctx.line_to(cell.br().x(), cell.br().y());
+                        ctx.line_to(cell.tl().x(), cell.br().y());
+                        ctx.line_to(cell.tl().x(), cell.tl().y());
+                        ctx.stroke();
+                        ctx.restore();
+                    }
+                }
+            }
+        }
+        ctx.restore();
+        Ok(())
+    }
+}
+
+fn main() -> Result<(), JsValue> {
+    let document = web_sys::window().unwrap().document().unwrap();
+    let canvas = document
+        .create_element("canvas")?
+        .dyn_into::<web_sys::HtmlCanvasElement>()?;
+    canvas.style().set_property("background-color", "black")?;
+    document.body().unwrap().append_child(&canvas)?;
+    // canvas.style().set_property("border", "solid")?;
+    let window = web_sys::window().expect("should have a window in this context");
+    let width = window.inner_width().unwrap().as_f64().unwrap();
+    let height = window.inner_height().unwrap().as_f64().unwrap();
+    canvas.set_width(width as u32);
+    canvas.set_height(height as u32);
+    let app = new_shared_mut_ref(App::default());
+    let ctx = canvas
+        .get_context("2d")?
+        .unwrap()
+        .dyn_into::<web_sys::CanvasRenderingContext2d>()?;
+    let piece_drawer = new_shared_mut_ref(PieceDrawer::new(&document)?);
+    {
+        let piece_drawer = piece_drawer.clone();
+        let screen = Rect::new(Point::new(0.0, 0.0), Point::new(width, height));
+        app.borrow_mut().screen = screen;
+        app.borrow_mut().draw(&ctx, &piece_drawer.borrow())?;
+    }
+    {
+        let app = app.clone();
+        let canvas = canvas.clone();
+        let ctx = ctx.clone();
+        let piece_drawer = piece_drawer.clone();
+        let closure = Closure::<dyn FnMut()>::new(move || {
+            let window = web_sys::window().expect("should have a window in this context");
+            let width = window.inner_width().unwrap().as_f64().unwrap() as u32;
+            let height = window.inner_height().unwrap().as_f64().unwrap() as u32;
+            canvas.set_width(width);
+            canvas.set_height(height);
+            app.borrow_mut().screen = Rect::new(
+                Point::new(0.0, 0.0),
+                Point::new(canvas.width() as f64, canvas.height() as f64),
+            );
+            app.borrow_mut().draw(&ctx, &piece_drawer.borrow()).unwrap();
+        });
+        let window = web_sys::window().expect("should have a window in this context");
+        window.set_onresize(Some(closure.as_ref().unchecked_ref()));
+        closure.forget();
+    }
+
+    {
+        let app = app.clone();
+        let piece_drawer = piece_drawer.clone();
+        let mouse_click_handler = Closure::wrap(Box::new(move |event: MouseEvent| {
+            let mut app = app.borrow_mut();
+            let xform = app.xform.invert();
+            let board = &app.board;
+            let position = Point::new(event.x() as f64, event.y() as f64) * &xform - board.tl();
+            if position.x() > 0.0
+                && position.x() < board.width()
+                && position.y() > 0.0
+                && position.y() < board.height()
+            {
+                let col = f64::floor(position.x() / App::SQUARE_SIZE) as usize;
+                let row = f64::floor(position.y() / App::SQUARE_SIZE) as usize;
+                let row = map_row(app.main_player, row);
+                if (row + col) % 2 == 0 {
+                    let position = Position::new(row as u8, col as u8).unwrap();
+                    let selected_move = app
+                        .available_moves
+                        .iter()
+                        .find(|mv| mv.get_end_position() == position)
+                        .map(Move::clone);
+                    if app.selected_piece.is_some() && selected_move.is_some() {
+                        let mv = selected_move.unwrap();
+                        app.game.check_and_apply_move(&mv).unwrap();
+                        app.selected_piece = None;
+                        app.available_moves.clear();
+                    } else {
+                        app.selected_piece = Some(position);
+                        let mut available_moves = Vec::<Move>::new();
+                        for mv in app.game.moves_for_piece(position) {
+                            available_moves.push(mv);
+                        }
+                        app.available_moves = available_moves;
+                        // console_log!("Clicked at: ({}, {})", col, row);
+                    }
+                } else {
+                    app.selected_piece = None;
+                    app.available_moves.clear();
+                }
+            } else {
+                app.selected_piece = None;
+                app.available_moves.clear();
+            }
+            app.draw(&ctx, &piece_drawer.borrow()).unwrap();
+        }) as Box<dyn FnMut(MouseEvent)>);
+        canvas.set_onclick(Some(mouse_click_handler.as_ref().unchecked_ref()));
+        mouse_click_handler.forget();
+    }
+
+    Ok(())
+}

rdraught-wasm/src/types.rs

@@ -0,0 +1,12 @@
+use std::cell::{Cell, RefCell};
+use std::rc::Rc;
+
+pub(crate) type SharedMutable<T> = Rc<Cell<T>>;
+pub(crate) type SharedMutableRef<T> = Rc<RefCell<T>>;
+pub(crate) fn new_shared_mut_ref<T>(obj: T) -> SharedMutableRef<T> {
+    Rc::new(RefCell::new(obj))
+}
+
+pub(crate) fn new_shared_mut<T>(obj: T) -> SharedMutable<T> {
+    Rc::new(Cell::new(obj))
+}

rdraught/Cargo.toml

@@ -13,7 +13,9 @@ name = "rdraught"
 crate-type = ["lib"]
 
 [dependencies]
-heapless = "0.8"
+heapless.workspace = true
+strum.workspace = true
+strum_macros.workspace = true
 
-[dev-dependencies]
+[features]
-rand = "0.9"
+std = []

rdraught/examples/checkers.rs

@@ -1,6 +1,5 @@
 use heapless::Vec;
-use rdraught::draughts::{DraughtsBoard, Piece};
+use rdraught::{DraughtsBoard, Piece, Position};
-use rdraught::position::Position;
 
 fn main() {
     let board = DraughtsBoard::default();
@@ -15,7 +14,7 @@ fn main() {
     pieces.push(Piece::CrownedRedPawn).unwrap();
 
     board
-        .pieces(&pieces)
+        .pieces(pieces)
         .for_each(|pos| println!("({}, {}): {:?}", pos.row(), pos.col(), board[pos]));
     // println!("{:?}", board[Position::new(0, 0)]);
 

rdraught/src/board.rs

@@ -1,131 +0,0 @@
-use core::iter::Enumerate;
-use core::iter::Flatten;
-use core::ops::Index;
-use core::ops::IndexMut;
-
-use super::position::Position;
-
-pub trait RectangularBoard {
-    fn rows() -> usize;
-    fn columns() -> usize;
-}
-
-#[derive(Debug, Clone)]
-pub(crate) struct Board<TYPE, const ROWS: usize, const COLUMNS: usize> {
-    data: [[TYPE; COLUMNS]; ROWS],
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> RectangularBoard
-    for Board<TYPE, ROWS, COLUMNS>
-{
-    fn rows() -> usize {
-        ROWS
-    }
-
-    fn columns() -> usize {
-        COLUMNS
-    }
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> Default for Board<TYPE, ROWS, COLUMNS>
-where
-    TYPE: Default,
-{
-    fn default() -> Self {
-        Self::new(|_| TYPE::default())
-    }
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> IntoIterator for Board<TYPE, ROWS, COLUMNS> {
-    type Item = (usize, usize, TYPE);
-
-    type IntoIter = BoardIterator<TYPE, ROWS, COLUMNS>;
-
-    fn into_iter(self) -> Self::IntoIter {
-        BoardIterator {
-            it: self.data.into_iter().flatten().enumerate(),
-        }
-    }
-}
-
-pub struct BoardIteratorRef<'a, TYPE, const ROWS: usize, const COLUMNS: usize> {
-    it: Enumerate<Flatten<core::slice::Iter<'a, [TYPE; COLUMNS]>>>,
-}
-
-impl<'a, TYPE, const ROWS: usize, const COLUMNS: usize> Iterator
-    for BoardIteratorRef<'a, TYPE, ROWS, COLUMNS>
-where
-    TYPE: Clone + Copy,
-{
-    fn next(&mut self) -> Option<Self::Item> {
-        self.it
-            .next()
-            .map(|(index, value)| (index / COLUMNS, index % COLUMNS, *value))
-    }
-    type Item = (usize, usize, TYPE);
-}
-
-impl<'a, TYPE, const ROWS: usize, const COLUMNS: usize> IntoIterator
-    for &'a Board<TYPE, ROWS, COLUMNS>
-where
-    TYPE: Clone + Copy,
-{
-    fn into_iter(self) -> BoardIteratorRef<'a, TYPE, ROWS, COLUMNS> {
-        BoardIteratorRef {
-            it: (self.data).iter().flatten().enumerate(),
-        }
-    }
-
-    type IntoIter = BoardIteratorRef<'a, TYPE, ROWS, COLUMNS>;
-    type Item = (usize, usize, TYPE);
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> Board<TYPE, ROWS, COLUMNS> {
-    pub(crate) fn new<INITIALIZER>(mut cb: INITIALIZER) -> Self
-    where
-        INITIALIZER: FnMut((usize, usize)) -> TYPE,
-    {
-        let values: [[TYPE; COLUMNS]; ROWS] =
-            core::array::from_fn(|i| core::array::from_fn(|j| cb((i, j))));
-        Board { data: values }
-    }
-
-    pub(crate) fn iter(&self) -> BoardIteratorRef<'_, TYPE, ROWS, COLUMNS> {
-        BoardIteratorRef {
-            it: (self.data).iter().flatten().enumerate(),
-        }
-    }
-}
-
-pub struct BoardIterator<TYPE, const ROWS: usize, const COLUMNS: usize> {
-    it: Enumerate<Flatten<core::array::IntoIter<[TYPE; COLUMNS], ROWS>>>,
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> Iterator
-    for BoardIterator<TYPE, ROWS, COLUMNS>
-{
-    fn next(&mut self) -> Option<Self::Item> {
-        self.it
-            .next()
-            .map(|(index, value)| (index / COLUMNS, index % COLUMNS, value))
-    }
-    type Item = (usize, usize, TYPE);
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> Index<Position> for Board<TYPE, ROWS, COLUMNS> {
-    type Output = TYPE;
-
-    fn index(&self, position: Position) -> &Self::Output {
-        let index = position.to_index();
-        &self.data[index.1][index.0]
-    }
-}
-
-impl<TYPE, const ROWS: usize, const COLUMNS: usize> IndexMut<Position>
-    for Board<TYPE, ROWS, COLUMNS>
-{
-    fn index_mut(&mut self, position: Position) -> &mut Self::Output {
-        let index = position.to_index();
-        &mut self.data[index.1][index.0]
-    }
-}

rdraught/src/circular_buffer.rs

@@ -0,0 +1,297 @@
+use core::mem::MaybeUninit;
+use core::result::Result;
+
+#[derive(Debug, PartialEq)]
+pub enum Error {
+    BufferIsFull,
+    BufferIsEmpty,
+    BufferHasZeroSize,
+}
+
+pub struct CircularBuffer<T: Sized, const SIZE: usize> {
+    buffer: [MaybeUninit<T>; SIZE],
+    front: usize,
+    rear: usize,
+    fill: usize,
+}
+
+impl<T: Sized, const SIZE: usize> CircularBuffer<T, SIZE> {
+    pub fn new() -> CircularBuffer<T, SIZE> {
+        CircularBuffer {
+            buffer: [const { MaybeUninit::uninit() }; SIZE],
+            front: 0,
+            rear: 0,
+            fill: 0,
+        }
+    }
+
+    pub fn push(&mut self, element: T) -> Result<(), Error> {
+        if self.len() == SIZE {
+            Err(Error::BufferIsFull)
+        } else {
+            self.buffer[self.rear].write(element);
+            self.rear = (self.rear + 1) % SIZE;
+            self.fill += 1;
+            Ok(())
+        }
+    }
+
+    pub fn push_evict(&mut self, element: T) -> Option<T> {
+        let result = if self.len() == SIZE {
+            self.pop_front()
+        } else {
+            None
+        };
+        self.buffer[self.rear].write(element);
+        self.rear = (self.rear + 1) % SIZE;
+        self.fill += 1;
+        result
+    }
+
+    pub fn pop_front(&mut self) -> Option<T> {
+        if self.len() == 0 {
+            None
+        } else {
+            let mut result = MaybeUninit::uninit();
+            core::mem::swap(&mut result, &mut self.buffer[self.front]);
+            self.front = (self.front + 1) % SIZE;
+            self.fill -= 1;
+            Some(unsafe { result.assume_init() })
+        }
+    }
+
+    pub fn pop_back(&mut self) -> Option<T> {
+        if self.len() == 0 {
+            None
+        } else {
+            let mut result = MaybeUninit::uninit();
+            core::mem::swap(&mut result, &mut self.buffer[self.rear - 1]);
+            self.rear = (self.rear - 1) % SIZE;
+            self.fill -= 1;
+            Some(unsafe { result.assume_init() })
+        }
+    }
+
+    pub fn len(&self) -> usize {
+        self.fill
+    }
+
+    pub fn capacity(&self) -> usize {
+        SIZE
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
+
+    pub fn iter(&self) -> impl DoubleEndedIterator<Item = &T> {
+        CircularBufferIteratorRef::<T, SIZE> {
+            cb: self,
+            count: 0,
+            count_back: 0,
+        }
+    }
+
+    pub fn iter_mut(&mut self) -> impl DoubleEndedIterator<Item = &mut T> {
+        CircularBufferIteratorMutRef::<T, SIZE> {
+            cb: self,
+            count: 0,
+            count_back: 0,
+        }
+    }
+
+    pub fn first(&self) -> Option<&T> {
+        if self.len() > 0 {
+            unsafe { Some(self.buffer[self.front].assume_init_ref()) }
+        } else {
+            None
+        }
+    }
+
+    pub fn last(&self) -> Option<&T> {
+        if self.len() > 0 {
+            unsafe { Some(self.buffer[self.rear - 1].assume_init_ref()) }
+        } else {
+            None
+        }
+    }
+}
+
+pub struct CircularBufferIterator<T: Sized, const SIZE: usize> {
+    buffer: CircularBuffer<T, SIZE>,
+}
+
+impl<T: Sized, const SIZE: usize> Iterator for CircularBufferIterator<T, SIZE> {
+    fn next(&mut self) -> Option<Self::Item> {
+        self.buffer.pop_front()
+    }
+    type Item = T;
+}
+
+impl<T: Sized, const SIZE: usize> IntoIterator for CircularBuffer<T, SIZE> {
+    fn into_iter(self) -> Self::IntoIter {
+        CircularBufferIterator { buffer: self }
+    }
+
+    type IntoIter = CircularBufferIterator<T, SIZE>;
+    type Item = T;
+}
+
+pub struct CircularBufferIteratorRef<'a, T: Sized, const SIZE: usize> {
+    cb: &'a CircularBuffer<T, SIZE>,
+    count: usize,
+    count_back: usize,
+}
+
+impl<'a, T: Sized, const SIZE: usize> Iterator for CircularBufferIteratorRef<'a, T, SIZE> {
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.count + self.count_back == self.cb.len() {
+            None
+        } else {
+            let i = (self.cb.front + self.count) % SIZE;
+            let result = Some(unsafe { self.cb.buffer[i].assume_init_ref() });
+            self.count += 1;
+            result
+        }
+    }
+    type Item = &'a T;
+}
+
+impl<'a, T: Sized, const SIZE: usize> DoubleEndedIterator
+    for CircularBufferIteratorRef<'a, T, SIZE>
+{
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.count_back == self.cb.len() {
+            None
+        } else {
+            let i = (SIZE + self.cb.rear - 1 - self.count_back) % SIZE;
+            let result = Some(unsafe { self.cb.buffer[i].assume_init_ref() });
+            self.count_back += 1;
+            result
+        }
+    }
+}
+
+impl<'a, T: Sized, const SIZE: usize> IntoIterator for &'a CircularBuffer<T, SIZE> {
+    fn into_iter(self) -> Self::IntoIter {
+        CircularBufferIteratorRef {
+            cb: self,
+            count: 0,
+            count_back: 0,
+        }
+    }
+
+    type IntoIter = CircularBufferIteratorRef<'a, T, SIZE>;
+    type Item = &'a T;
+}
+
+pub struct CircularBufferIteratorMutRef<'a, T: Sized, const SIZE: usize> {
+    cb: &'a mut CircularBuffer<T, SIZE>,
+    count: usize,
+    count_back: usize,
+}
+
+impl<'a, T: Sized, const SIZE: usize> Iterator for CircularBufferIteratorMutRef<'a, T, SIZE> {
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.count + self.count_back == self.cb.len() {
+            None
+        } else {
+            let result = unsafe {
+                let i = (self.cb.front + self.count) % SIZE;
+                Some(core::mem::transmute::<&mut T, &'a mut T>(
+                    self.cb.buffer[i].assume_init_mut(),
+                ))
+            };
+            self.count += 1;
+            result
+        }
+    }
+
+    type Item = &'a mut T;
+}
+
+impl<'a, T: Sized, const SIZE: usize> DoubleEndedIterator
+    for CircularBufferIteratorMutRef<'a, T, SIZE>
+{
+    fn next_back(&mut self) -> Option<Self::Item> {
+        if self.count + self.count_back == self.cb.len() {
+            None
+        } else {
+            let result = unsafe {
+                let i = (SIZE + self.cb.rear - 1 - self.count_back) % SIZE;
+                Some(core::mem::transmute::<&mut T, &'a mut T>(
+                    self.cb.buffer[i].assume_init_mut(),
+                ))
+            };
+            self.count_back += 1;
+            result
+        }
+    }
+}
+
+impl<'a, T: Sized, const SIZE: usize> IntoIterator for &'a mut CircularBuffer<T, SIZE> {
+    fn into_iter(self) -> Self::IntoIter {
+        CircularBufferIteratorMutRef {
+            cb: self,
+            count: 0,
+            count_back: 0,
+        }
+    }
+
+    type IntoIter = CircularBufferIteratorMutRef<'a, T, SIZE>;
+    type Item = &'a mut T;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        const SZ: usize = 10;
+        let mut cb = CircularBuffer::<i32, SZ>::new();
+        for i in 0..SZ {
+            let result = cb.push(i as i32);
+            assert_eq!(true, result.is_ok());
+        }
+
+        //Check the buffer is full
+        assert_eq!(SZ, cb.len());
+
+        //The buffer contains the elements that we've pushed
+        for (index, elem) in (&cb).into_iter().enumerate() {
+            assert_eq!(index as i32, *elem);
+        }
+        let result = cb.push(10);
+        //Cannot push in a full buffer
+        assert_eq!(true, result.is_err());
+
+        //Check push_evict returns the first element
+        let result = cb.push_evict(10);
+        assert_eq!(Some(0), result);
+
+        //Check pop_front returns the second element
+        let second = cb.pop_front();
+        assert_eq!(Some(1), second);
+        //Check the buffer is not full
+        assert_eq!(SZ - 1, cb.len());
+
+        //Check pop_front returns the third element
+        let second = cb.pop_front();
+
+        assert_eq!(Some(2), second);
+        //Check the buffer is not full
+        assert_eq!(SZ - 2, cb.len());
+
+        //Replace all the elements with their index
+        for (n, i) in cb.iter_mut().enumerate() {
+            *i = n as i32;
+        }
+        for (n, i) in cb.iter().enumerate() {
+            assert_eq!(n as i32, *i);
+        }
+        for (n, i) in cb.iter().rev().enumerate() {
+            assert_eq!((cb.len() - n - 1) as i32, *i);
+        }
+    }
+}

rdraught/src/constants.rs

@@ -0,0 +1,3 @@
+pub const BITS_PER_POSITION: usize = 3;
+pub const POSITIONS: usize = 32;
+pub const POSITIONS_PER_ROW: usize = 4;

rdraught/src/lib.rs

@@ -1,7 +1,15 @@
 #![no_std]
-mod board;
-pub mod draughts;
-pub mod position;
 
-//use draughts::DraughtsBoard;
+mod circular_buffer;
-//use draughts::Piece;
+mod constants;
+pub mod draughts;
+mod movement;
+mod piece;
+mod player;
+mod position;
+
+pub use draughts::{DraughtsBoard, DraughtsGame, Error, RDraughtApplication, RectangularBoard};
+pub use movement::{LoggedMove, Move, MoveDirection};
+pub use piece::Piece;
+pub use player::Player;
+pub use position::Position;

rdraught/src/movement.rs

@@ -0,0 +1,269 @@
+use crate::position::Position;
+
+use crate::{Piece, Player, draughts::Error};
+use strum_macros::FromRepr;
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, FromRepr)]
+pub enum MoveDirection {
+    NE = 0,
+    SE = 1,
+    SW = 2,
+    NW = 3,
+}
+
+impl MoveDirection {
+    pub fn is_forward(&self, piece: Piece) -> Result<bool, Error> {
+        match piece.player() {
+            Some(Player::Red) => Ok(matches!(self, Self::SE) || matches!(self, Self::SW)),
+            Some(Player::White) => Ok(matches!(self, Self::NE) || matches!(self, Self::NW)),
+            None => Err(Error::NoPiece),
+        }
+    }
+}
+
+pub fn compute_end_position(
+    start_position: Position,
+    direction: MoveDirection,
+    is_capture: bool,
+) -> Position {
+    if is_capture {
+        let direction = direction;
+        match direction {
+            MoveDirection::NE => start_position + (2, 2),
+            MoveDirection::SE => start_position + (-2, 2),
+            MoveDirection::SW => start_position + (-2, -2),
+            MoveDirection::NW => start_position + (2, -2),
+        }
+    } else {
+        match direction {
+            MoveDirection::NE => start_position + (1, 1),
+            MoveDirection::SE => start_position + (-1, 1),
+            MoveDirection::SW => start_position + (-1, -1),
+            MoveDirection::NW => start_position + (1, -1),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct LoggedMove {
+    data: u16,
+}
+
+impl LoggedMove {
+    pub fn movement(start: Position, dir: MoveDirection, is_pawn_promoted: bool) -> LoggedMove {
+        let mut result = <Position as Into<u8>>::into(start) as u16;
+        result |= (dir as u16) << 5;
+        if is_pawn_promoted {
+            result |= 1u16 << 8;
+        }
+        LoggedMove { data: result }
+    }
+
+    pub fn capture(
+        start: Position,
+        dir: MoveDirection,
+        is_pawn_promoted: bool,
+        crowned_capture: bool,
+        multi_capture: bool,
+    ) -> LoggedMove {
+        let mut result = <Position as Into<u8>>::into(start) as u16;
+        result |= (dir as u16) << 5;
+        result |= 1u16 << 7;
+        if is_pawn_promoted {
+            result |= 1u16 << 8;
+        }
+        if crowned_capture {
+            result |= 1u16 << 9;
+        }
+        if multi_capture {
+            result |= 1u16 << 10;
+        }
+        LoggedMove { data: result }
+    }
+
+    pub fn start_position(&self) -> Position {
+        Position::from((self.data & 31) as u8)
+    }
+
+    pub fn direction(&self) -> MoveDirection {
+        MoveDirection::from_repr(((self.data & 96) >> 5) as usize).unwrap()
+    }
+
+    pub fn is_capture(&self) -> bool {
+        (self.data & 128) != 0
+    }
+
+    pub fn is_movement(&self) -> bool {
+        !self.is_capture()
+    }
+
+    pub fn pawn_promoted(&self) -> bool {
+        (self.data & 256) != 0
+    }
+
+    pub fn crowned_captured(&self) -> bool {
+        (self.data & 512) != 0
+    }
+
+    pub fn multi_capture(&self) -> bool {
+        (self.data & 1024) != 0
+    }
+
+    pub fn get_end_position(&self) -> Position {
+        compute_end_position(
+            self.start_position().clone(),
+            self.direction(),
+            self.is_capture(),
+        )
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone)]
+pub enum Move {
+    Movement {
+        start: Position,
+        direction: MoveDirection,
+    },
+    Capture {
+        start: Position,
+        direction: MoveDirection,
+    },
+}
+
+impl Move {
+    pub fn movement(start: Position, direction: MoveDirection) -> Move {
+        Move::Movement { start, direction }
+    }
+    pub fn capture(start: Position, direction: MoveDirection) -> Move {
+        Move::Capture { start, direction }
+    }
+
+    pub fn is_movement(&self) -> bool {
+        match self {
+            Move::Movement {
+                start: _,
+                direction: _,
+            } => true,
+            Move::Capture {
+                start: _,
+                direction: _,
+            } => false,
+        }
+    }
+
+    pub fn is_capture(&self) -> bool {
+        !self.is_movement()
+    }
+
+    pub fn get_start_position(&self) -> Position {
+        match self {
+            Move::Movement {
+                start,
+                direction: _,
+            } => start.clone(),
+            Move::Capture {
+                start,
+                direction: _,
+            } => start.clone(),
+        }
+    }
+
+    pub fn get_end_position(&self) -> Position {
+        compute_end_position(
+            self.get_start_position(),
+            self.get_direction(),
+            self.is_capture(),
+        )
+    }
+
+    pub fn get_direction(&self) -> MoveDirection {
+        match self {
+            Move::Movement {
+                start: _,
+                direction,
+            } => direction.clone(),
+            Move::Capture {
+                start: _,
+                direction,
+            } => direction.clone(),
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{LoggedMove, MoveDirection, Piece};
+    use crate::Position;
+
+    struct MoveData {
+        piece: Piece,
+        start: Position,
+        dir: MoveDirection,
+        capture: bool,
+        crowned_capture: bool,
+        pawn_promoted: bool,
+        multi_capture: bool,
+    }
+
+    #[test]
+    fn test_from_into() {
+        let move_datas = [
+            MoveData {
+                piece: Piece::SimpleRedPawn,
+                start: Position::new(0, 0).unwrap(),
+                dir: super::MoveDirection::NE,
+                capture: false,
+                crowned_capture: false,
+                pawn_promoted: false,
+                multi_capture: false,
+            },
+            MoveData {
+                piece: Piece::SimpleWhitePawn,
+                start: Position::new(3, 5).unwrap(),
+                dir: super::MoveDirection::SW,
+                capture: false,
+                crowned_capture: false,
+                pawn_promoted: false,
+                multi_capture: false,
+            },
+            MoveData {
+                piece: Piece::SimpleWhitePawn,
+                start: Position::new(6, 6).unwrap(),
+                dir: super::MoveDirection::NW,
+                capture: false,
+                crowned_capture: false,
+                pawn_promoted: true,
+                multi_capture: false,
+            },
+            MoveData {
+                piece: Piece::SimpleWhitePawn,
+                start: Position::new(5, 5).unwrap(),
+                dir: super::MoveDirection::NE,
+                capture: true,
+                crowned_capture: true,
+                pawn_promoted: true,
+                multi_capture: true,
+            },
+        ];
+
+        for md in move_datas {
+            let mv = if md.capture {
+                LoggedMove::capture(
+                    md.start,
+                    md.dir,
+                    md.pawn_promoted,
+                    md.crowned_capture,
+                    md.multi_capture,
+                )
+            } else {
+                LoggedMove::movement(md.start, md.dir, md.pawn_promoted)
+            };
+            assert_eq!(md.start, mv.start_position());
+            assert_eq!(md.dir, mv.direction());
+            assert_eq!(md.capture, mv.is_capture());
+            assert_eq!(md.crowned_capture, mv.crowned_captured());
+            assert_eq!(md.pawn_promoted, mv.pawn_promoted());
+            assert_eq!(md.multi_capture, mv.multi_capture());
+        }
+    }
+}

rdraught/src/piece.rs

@@ -0,0 +1,35 @@
+use crate::player::Player;
+use strum_macros::FromRepr;
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy, FromRepr)]
+pub enum Piece {
+    NoPiece = 0,
+    SimpleRedPawn = 1,
+    CrownedRedPawn = 3,
+    SimpleWhitePawn = 2,
+    CrownedWhitePawn = 4,
+}
+
+impl Piece {
+    pub fn player(&self) -> Option<Player> {
+        if self.is_present() && (*self as u32) % 2 == 1 {
+            Some(Player::Red)
+        } else if self.is_present() && (*self as u32) % 2 == 0 {
+            Some(Player::White)
+        } else {
+            None
+        }
+    }
+
+    pub fn is_present(&self) -> bool {
+        *self != Piece::NoPiece
+    }
+
+    pub fn is_crowned(&self) -> bool {
+        (*self as u32) > 2
+    }
+
+    pub fn can_move_backward(&self) -> bool {
+        self.is_crowned()
+    }
+}

rdraught/src/player.rs

@@ -0,0 +1,5 @@
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum Player {
+    White = 0,
+    Red = 1,
+}

rdraught/src/position.rs

@@ -1,9 +1,12 @@
+use crate::Error;
 use core::fmt::Display;
 use core::ops::Add;
 use core::ops::Div;
 use core::ops::Mul;
 use core::ops::Sub;
 
+use crate::constants::POSITIONS_PER_ROW;
+
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub struct Position((u8, u8));
 
@@ -22,8 +25,12 @@ impl Position {
         Position((index.0 as u8, index.1 as u8))
     }
 
-    pub fn new(row: u8, column: u8) -> Position {
+    pub fn new(row: u8, column: u8) -> Result<Position, Error> {
-        Position((row, column))
+        if (row + column) % 2 == 0 {
+            Ok(Position((row, column)))
+        } else {
+            Err(Error::InvalidPosition)
+        }
     }
 
     pub fn row(&self) -> u8 {
@@ -109,3 +116,46 @@ impl Mul<(i32, i32)> for Position {
         ))
     }
 }
+
+impl From<Position> for u8 {
+    fn from(pos: Position) -> Self {
+        (8 - 1 - pos.row()) * (POSITIONS_PER_ROW as u8) + pos.col() / 2
+    }
+}
+
+impl From<u8> for Position {
+    fn from(n: u8) -> Self {
+        // println!("{}", n);
+        let row = 8 - 1 - n / (POSITIONS_PER_ROW as u8);
+        let offset = if row % 2 == 0 { 0u8 } else { 1u8 };
+        let col = n % (POSITIONS_PER_ROW as u8) * 2 + offset;
+        Position::new(row, col).unwrap()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Position;
+
+    #[test]
+    fn test_from_into() {
+        let positions = [
+            Position::new(4, 6),
+            Position::new(0, 4),
+            Position::new(1, 3),
+            Position::new(7, 1),
+            Position::new(2, 2),
+            Position::new(5, 3),
+            Position::new(3, 7),
+            Position::new(6, 0),
+            Position::new(7, 7),
+        ];
+
+        for p in positions {
+            let p = p.unwrap();
+            let n = <Position as Into<u8>>::into(p);
+            let p2 = <Position as From<u8>>::from(n);
+            assert_eq!(p, p2);
+        }
+    }
+}