continuous-chess/index.html at main · cellomath/continuous-chess · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE-edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Chess Attack</title>
</head>
<body style="margin:0;padding:0;border-width:0">
    <script type="module">
        import init, {Board, Coordinate} from './pkg/chess.js'
        await init()

        const canvas = document.getElementById('chessboard');
        const context = canvas.getContext('2d');


        let white = {
            pawn: new Image(),
            knight: new Image(),
            bishop: new Image(),
            rook: new Image(),
            queen: new Image(),
            king: new Image()
        };
        white.pawn.src = "./img/white/pawn.png";
        white.knight.src = "./img/white/knight.png";
        white.bishop.src = "./img/white/bishop.png";
        white.rook.src = "./img/white/rook.png";
        white.queen.src = "./img/white/queen.png";
        white.king.src = "./img/white/king.png";
        let black = {
            pawn: new Image(),
            knight: new Image(),
            bishop: new Image(),
            rook: new Image(),
            queen: new Image(),
            king: new Image()
        };
        black.pawn.src = "./img/black/pawn.png";
        black.knight.src = "./img/black/knight.png";
        black.bishop.src = "./img/black/bishop.png";
        black.rook.src = "./img/black/rook.png";
        black.queen.src = "./img/black/queen.png";
        black.king.src = "./img/black/king.png";

        var selectedPiece = null;
        var held_piece = null;
        var mouse_position = null;

        var chessBoard = new Board();


        function drawStuff() {
            context.fillStyle = "#ffffff";
            context.fillRect(0,0,width,height);
            for (let x = 0; x < 8; x+=1){
                for (let y = 0; y < 8; y+=1){
                    if((x+y)%2 == 0){
                        context.fillStyle = "#4088AD";
                    } else {
                        context.fillStyle = "#eeecee";
                    }
                    if (selectedPiece != null){
                        if (x === selectedPiece.x && y === selectedPiece.y) {
                            context.fillStyle = "#eeec77";
                        }
                    }
                    let coord = board_to_pixel({x:x,y:y});
                    context.fillRect(coord.x, coord.y, square/8, square/8);
                }
            }
            let text_vertical_offset = square/3;
            context.font = (0.5*square/8) + "px serif";
            context.textAlign = "center";
            context.fillStyle = "#000000";
            let piece_size = 0.9*square/8;
            function color(health_proportion){
                if(health_proportion > 0.6){
                    return "#338833";
                }
                if (health_proportion > 0.3){
                    return "#DBC239"
                }
                if (health_proportion > 0.15){
                    return "#E58332"
                }
                return "#FF5B5B";
            }

            function show_piece_at(piece, health, square_position){
                let piece_position = {x:square_position.x+0.5*(square/8-piece_size), y:square_position.y};
                let bar_position = {x:square_position.x, y:square_position.y+piece_size};
                context.drawImage(piece, piece_position.x, piece_position.y, piece_size, piece_size);
                context.fillStyle = color(health);
                context.fillRect(bar_position.x, bar_position.y, health*square/8, square/8-piece_size);
            }
            for (let x = 0; x < 8; x+=1){
                for (let y = 0; y < 8; y+=1){
                    let piece = chessBoard.get_piece_at({x:x,y:y});
                    if (piece != undefined) {
                        let health = piece.relative_health();
                        let t = [white, black][piece.team];
                        let piece_image = [t.pawn, t.knight, t.bishop, t.rook, t.queen, t.king][piece.piece_type];
                        let square_position;
                        if (held_piece != null) {
                            if (x == held_piece.x && y == held_piece.y) {
                                continue;
                            }
                        }
                        square_position = board_to_pixel({x:x,y:y});
                        show_piece_at(piece_image, health, square_position);
                    }
                }
            }
            if(held_piece != null) {
                let piece = chessBoard.get_piece_at(held_piece);
                if (piece != undefined) {
                    let health = piece.relative_health();
                    let t = [white,black][piece.team];
                    let piece_image = [t.pawn, t.knight, t.bishop, t.rook, t.queen, t.king][piece.piece_type];
                    let square_position = {x:mouse_position.x-piece_size/2, y:mouse_position.y-piece_size/2};
                    show_piece_at(piece_image, health, square_position);
                }
            }
        }

        // resize the canvas to fill browser window dynamically

        let height = canvas.height;
        let width = canvas.width;
        let offset = width-height;
        let xoffset, yoffset;
        let square;


        function resizeCanvas() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
            height = canvas.height;
            width = canvas.width;
            offset = width-height;
            if (offset > 0) {
                xoffset = offset/2;
                yoffset = 0;
                square = height;
            } else {
                xoffset = 0;
                yoffset = -offset/2;
                square = width;
            }

            drawStuff();
        }
        resizeCanvas();

        function pixel_to_board(coord) {
            let result = {
                x:Math.floor((coord.x-xoffset)*8/square),
                y:7-Math.floor((coord.y-yoffset)*8/square)
            };
            return result;
        }

        function board_to_pixel(coord) {
            let result =
            {
                x:xoffset+((coord.x)*square/8),
                y:yoffset+((7-coord.y)*square/8)
            };
            return result;
        }

        function mouseDown(event) {
            let rect = event.target.getBoundingClientRect();
            let pr = window.devicePixelRatio;
            let mouse = {x:(event.clientX - rect.left), y:(event.clientY - rect.top)};
            let coord = pixel_to_board(mouse);

            if(0<=coord.x && coord.x < 8 &&
                0<=coord.y && coord.y < 8 ) {
                selectedPiece = coord;
                held_piece = coord;
            } else {
                selectedPiece = null;
                held_piece = null;
            }
            drawStuff();
        }

        function mouseMove(){
            let rect = event.target.getBoundingClientRect();
            mouse_position = {x:event.clientX - rect.left, y:event.clientY - rect.top};
            drawStuff();
        }

        function mouseUp(event) {
            let rect = event.target.getBoundingClientRect();
            let pr = window.devicePixelRatio;
            let mouse = {x:(event.clientX - rect.left), y:(event.clientY - rect.top)};

            held_piece = null;
            let coord = pixel_to_board(mouse);

            console.log("Attempting to move", selectedPiece, "to", coord);
            if(0<=coord.x && coord.x < 8 &&
                0<=coord.y && coord.y < 8 ) {
                let attempt = chessBoard.movePiece(selectedPiece, coord);
                console.log(attempt);
                if (attempt) {
                    chessBoard.run_damage_calculation();
                    selectedPiece = null;
                }
            } else {
                selectedPiece = null;
            }
            drawStuff();
        }


        window.addEventListener('resize', resizeCanvas, false);
        canvas.addEventListener('mousedown', mouseDown, true);
        canvas.addEventListener('mouseup', mouseUp, true);
        canvas.addEventListener('mousemove', mouseMove, true);

        console.log(chessBoard);
        console.log(chessBoard.get_piece_at(new Coordinate(0,1)));
        console.log(chessBoard.get_piece_at({x:0,y:1}));
        console.log(board_to_pixel({x:0, y:0}))
    </script>
    <canvas id="chessboard">
</body>
</html>