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Copy pathboard.ts
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299 lines (253 loc) · 7.63 KB
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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import {BoardSize, COL_LABELS, Color, Coord, Move, N, Nullable, Point} from './base'
import {Grid, Layer} from './layer'
import {Position} from './position'
import {getElement, pixelRatio} from './util'
import {View} from './view'
class Board extends View {
stones: Color[] = [];
ctx: CanvasRenderingContext2D;
backgroundColor: string;
pointW: number;
pointH: number;
stoneRadius: number;
elem: HTMLElement;
protected layers: Layer[] = [];
constructor(parent: HTMLElement | string, public position: Position, layers: Layer[]) {
super();
if (typeof(parent) == 'string') {
parent = getElement(parent);
}
this.elem = parent;
this.backgroundColor = '#db6';
let canvas = document.createElement('canvas');
this.ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
parent.appendChild(canvas);
window.addEventListener('resize', () => {
this.resizeCanvas();
this.draw();
});
this.resizeCanvas();
this.addLayer(new Grid());
this.addLayers(layers);
}
private resizeCanvas() {
let pr = pixelRatio();
let canvas = this.ctx.canvas;
let parent = canvas.parentElement as HTMLElement;
canvas.width = pr * (parent.offsetWidth);
canvas.height = pr * (parent.offsetHeight);
canvas.style.width = `${parent.offsetWidth}px`;
canvas.style.height = `${parent.offsetHeight}px`;
this.pointW = this.ctx.canvas.width / (N + 1);
this.pointH = this.ctx.canvas.height / (N + 1);
this.stoneRadius = 0.96 * Math.min(this.pointW, this.pointH) / 2;
}
newGame(rootPosition: Position) {
this.position = rootPosition;
for (let layer of this.layers) {
layer.clear();
}
this.draw();
}
addLayer(layer: Layer) {
this.layers.push(layer);
layer.addToBoard(this);
}
addLayers(layers: Layer[]) {
for (let layer of layers) {
this.addLayer(layer);
}
}
// Update the board's layers from the given state object.
// Board layers that are derived from DataLayer will look in the state object
// for a named property. If that property exists, the layer will update its
// internal state from it.
setPosition(position: Position) {
if (this.position == position) {
return;
}
this.position = position;
let allProps = new Set<string>(Object.keys(position));
for (let layer of this.layers) {
layer.update(allProps);
}
this.draw();
}
update(update: Position | Position.Update) {
let anythingChanged = false;
let keys = new Set<string>(Object.keys(update));
for (let layer of this.layers) {
if (layer.update(keys)) {
anythingChanged = true;
}
}
if (anythingChanged) {
this.draw();
}
}
drawImpl() {
let ctx = this.ctx;
ctx.fillStyle = this.backgroundColor;
ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
for (let layer of this.layers) {
if (layer.show) {
layer.draw();
}
}
}
getStone(p: Point) {
return this.position.stones[p.row * N + p.col];
}
canvasToBoard(x: number, y: number, threshold?: number): Nullable<Point> {
let pr = pixelRatio();
x *= pr;
y *= pr;
let canvas = this.ctx.canvas;
y = y * (N + 1) / canvas.height - 0.5;
x = x * (N + 1) / canvas.width - 0.5;
let row = Math.floor(y);
let col = Math.floor(x);
if (row < 0 || row >= N || col < 0 || col >= N) {
return null;
}
if (threshold) {
let fx = 0.5 - (x - col);
let fy = 0.5 - (y - row);
let disSqr = fx * fx + fy * fy;
if (disSqr > threshold * threshold) {
return null;
}
}
return {row: row, col: col};
}
boardToCanvas(row: number, col: number): Coord {
let canvas = this.ctx.canvas;
return {
x: canvas.width * (col + 1.0) / (N + 1),
y: canvas.height * (row + 1.0) / (N + 1)
};
}
drawStones(ps: Point[], color: Color, alpha: number) {
if (ps.length == 0) {
return;
}
let ctx = this.ctx;
let pr = pixelRatio();
if (alpha == 1) {
ctx.shadowBlur = 4 * pr;
ctx.shadowOffsetX = 1.5 * pr;
ctx.shadowOffsetY = 1.5 * pr;
ctx.shadowColor = `rgba(0, 0, 0, ${color == Color.Black ? 0.4 : 0.3})`;
}
ctx.fillStyle = this.stoneFill(color, alpha);
let r = this.stoneRadius;
for (let p of ps) {
let c = this.boardToCanvas(p.row, p.col);
ctx.beginPath();
ctx.translate(c.x + 0.5, c.y + 0.5);
ctx.arc(0, 0, r, 0, 2 * Math.PI);
ctx.fill();
ctx.setTransform(1, 0, 0, 1, 0, 0);
}
if (alpha == 1) {
ctx.shadowColor = 'rgba(0, 0, 0, 0)';
}
}
private stoneFill(color: Color, alpha: number) {
let grad: CanvasGradient;
if (color == Color.Black) {
let ofs = -0.5 * this.stoneRadius;
grad = this.ctx.createRadialGradient(
ofs, ofs, 0, ofs, ofs, 2 * this.stoneRadius);
grad.addColorStop(0, `rgba(68, 68, 68, ${alpha})`);
grad.addColorStop(1, `rgba(16, 16, 16, ${alpha})`);
} else if (color == Color.White) {
let ofs = -0.2 * this.stoneRadius;
grad = this.ctx.createRadialGradient(
ofs, ofs, 0, ofs, ofs, 1.2 * this.stoneRadius);
grad.addColorStop(0.4, `rgba(255, 255, 255, ${alpha})`);
grad.addColorStop(1, `rgba(204, 204, 204, ${alpha})`);
} else {
throw new Error(`Invalid color ${color}`);
}
return grad;
}
}
type ClickListener = (p: Point) => void;
class ClickableBoard extends Board {
enabled = false;
protected p: Point | null;
protected listeners: ClickListener[] = [];
constructor(parent: HTMLElement | string, position: Position, layerDescs: any[]) {
super(parent, position, layerDescs);
this.ctx.canvas.addEventListener('mousemove', (e) => {
// Find the point on the board being hovered over.
let p = this.canvasToBoard(e.offsetX, e.offsetY, 0.45);
// Clear the hovered point if there's already a stone on the board there.
if (p != null && this.getStone(p) != Color.Empty) {
p = null;
}
let changed: boolean;
if (p != null) {
changed = this.p == null || this.p.row != p.row || this.p.col != p.col;
} else {
changed = this.p != null;
}
if (changed) {
this.p = p;
this.draw();
}
});
this.ctx.canvas.addEventListener('mouseleave', (e) => {
if (this.p != null) {
this.p = null;
this.draw();
}
});
this.ctx.canvas.addEventListener('click', (e) => {
if (!this.p || !this.enabled) {
return;
}
for (let listener of this.listeners) {
listener(this.p);
}
this.p = null;
this.draw();
});
}
onClick(cb: ClickListener) {
this.listeners.push(cb);
}
setPosition(position: Position) {
if (position != this.position) {
this.p = null;
super.setPosition(position);
}
}
drawImpl() {
super.drawImpl();
let p = this.enabled ? this.p : null;
this.ctx.canvas.style.cursor = p ? 'pointer' : null;
if (p) {
this.drawStones([p], this.position.toPlay, 0.6);
}
}
}
export {
Board,
ClickableBoard,
COL_LABELS,
};