134 lines
3.5 KiB
JavaScript
134 lines
3.5 KiB
JavaScript
const BOX_SIDE = 80;
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const INDEX_MARGIN = BOX_SIDE / 2;
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const INDEX_LETTERS = "abcdefgh";
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export class Canvas {
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constructor() {
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this._canvas = document.createElement("canvas");
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let boardSide = BOX_SIDE * 8 + INDEX_MARGIN;
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this._canvas.width = boardSide;
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this._canvas.height = boardSide;
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document.body.appendChild(this._canvas);
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this.drawChessBoard();
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}
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drawChessBoard() {
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// Draw squares
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let ctx = this._canvas.getContext("2d");
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ctx.fillStyle = "#c0c0c0";
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for (let r = 0; r < 8; r++) {
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for (let c = 0; c < 8; c++) {
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if ((r + c) % 2)
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ctx.fillRect(
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c * BOX_SIDE + INDEX_MARGIN,
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r * BOX_SIDE + INDEX_MARGIN,
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BOX_SIDE,
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BOX_SIDE
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);
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}
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}
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// Draw letters
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ctx.fillStyle = "black";
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let fontsize = INDEX_MARGIN / 2;
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ctx.font = `${fontsize}px Monospace`;
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for (let idx = 0; idx < 8; idx++) {
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ctx.fillText(
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INDEX_LETTERS[idx],
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BOX_SIDE * idx + BOX_SIDE / 2 + INDEX_MARGIN - fontsize / 4,
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INDEX_MARGIN / 2
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);
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ctx.fillText(
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(8 - idx).toString(),
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INDEX_MARGIN / 2 - fontsize / 4,
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BOX_SIDE * idx + BOX_SIDE / 2 + INDEX_MARGIN + fontsize / 4
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);
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}
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}
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screenCoordsToRowCol(cx, cy) {
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let canvasRect = this._canvas.getBoundingClientRect();
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if (cx > canvasRect.right || cy > canvasRect.bottom) {
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return null;
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}
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let canvasX = cx - canvasRect.left;
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let canvasY = cy - canvasRect.top;
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let row = Math.floor((canvasY - INDEX_MARGIN) / BOX_SIDE);
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let col = Math.floor((canvasX - INDEX_MARGIN) / BOX_SIDE);
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return [row, col];
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}
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rowColToScreenCoords(row, col) {
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let canvasRect = this._canvas.getBoundingClientRect();
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let topPx =
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canvasRect.top + INDEX_MARGIN + row * BOX_SIDE + window.pageYOffset;
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let leftPx =
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canvasRect.left + INDEX_MARGIN + col * BOX_SIDE + window.pageXOffset;
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return [topPx, leftPx];
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}
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}
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function boardIndexToRowCol(boardIndex) {
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let [colLetter, rowDigit] = boardIndex;
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let row = 8 - parseInt(rowDigit);
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let col = INDEX_LETTERS.indexOf(colLetter);
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return [row, col];
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}
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export function rowColToBoardIndex(row, col) {
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let rowDigit = 8 - row;
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let colLetter = INDEX_LETTERS[col];
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return `${colLetter}${rowDigit}`;
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}
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export class PieceVis {
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constructor(piece) {
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this.icon = `./icons/${piece.who}_${piece.color}.svg`;
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this.position = piece.position;
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this.im = null;
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}
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draw(canvas) {
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let [topPx, leftPx] = canvas.rowColToScreenCoords(
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...boardIndexToRowCol(this.position),
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canvas
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);
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if (this.im === null) {
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let im = new Image(BOX_SIDE, BOX_SIDE);
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im.src = this.icon;
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im.onload = () => {
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im.style.position = "absolute";
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im.style.top = `${topPx}px`;
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im.style.left = `${leftPx}px`;
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};
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document.body.appendChild(im);
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this.im = im;
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} else {
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this.im.style.top = `${topPx}px`;
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this.im.style.left = `${leftPx}px`;
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}
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}
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undraw() {
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if (this.im !== null) {
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this.im.remove();
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this.im = null;
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}
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}
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}
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export class ConfigVis {
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constructor(configuration) {
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this.configuration = configuration;
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this.piecesVis = new Map();
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}
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draw(canvas) {
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for (const piece of this.configuration) {
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let pieceVis = new PieceVis(piece);
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pieceVis.draw(canvas);
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this.piecesVis.set(piece.position, pieceVis);
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}
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}
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undraw() {
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for (let [position, pieceVis] of this.piecesVis) {
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pieceVis.undraw();
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}
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this.piecesVis.clear();
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}
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}
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