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// 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 {getElement} from './util'

enum Color {

Empty,

Black,

White,

}

function otherColor(color: Color) {

if (color != Color.White && color != Color.Black) {

throw new Error(`invalid color ${color}`);

}

return color == Color.White ? Color.Black : Color.White;

}

enum BoardSize {

Nine = 9,

Nineteen = 19,

}

// Canvas coordinate.

interface Coord {

x: number;

y: number;

}

// Point on the board.

interface Point {

row: number;

col: number;

}

interface Move {

p: Point | null;

color: Color;

}

const COL_LABELS = 'ABCDEFGHJKLMNOPQRST';

const STAR_POINTS = {

[BoardSize.Nine]: [[2, 2], [2, 6], [6, 2], [6, 6], [4, 4]],

[BoardSize.Nineteen]: [[3, 3], [3, 9], [3, 15],

[9, 3], [9, 9], [9, 15],

[15, 3], [15, 9], [15, 15]],

};

interface BoardOptions {

// Caption to display at the bottom of the board (if any).

caption?: string;

// Margin in pixels to add to the board.

// Default is 0;

margin?: number;

// Whether or not to draw labels for each row and column on the board.

// Default is false.

labelRowCol?: boolean;

// Radius of the start points in pixels.

// Default is 2.5.

starPointRadius?: number;

}

class Board {

toPlay = Color.Black;

stones: Array<Color>;

protected ctx: CanvasRenderingContext2D;

protected pixelRatio: number;

protected backgroundColor: string;

protected lineColor: string;

protected stoneRadius: number;

protected pointW: number;

protected pointH: number;

protected caption: string | null;

protected marks: Array<string | null>;

protected variation = new Array<Move>();

protected heatMap: Float32Array;

protected labelRowCol: boolean;

protected margin: number;

protected starPointRadius: number;

constructor(parent: HTMLElement | string, public size: BoardSize, options: BoardOptions = {}) {

if (typeof(parent) == 'string') {

parent = getElement(parent);

}

this.backgroundColor = '#db6';

this.lineColor = '#864';

this.caption = options.caption || '';

this.labelRowCol = options.labelRowCol || false;

this.margin = options.margin || 0;

this.starPointRadius = options.starPointRadius || 2.5;

this.heatMap = new Float32Array(this.size * this.size);

this.stones = new Array<Color>(this.size * this.size);

this.marks = new Array<string | null>(this.size * this.size);

for (let i = 0; i < this.stones.length; ++i) {

this.stones[i] = Color.Empty;

this.marks[i] = null;

}

this.pixelRatio = window.devicePixelRatio || 1;

let canvas = document.createElement('canvas');

canvas.style.margin = `${this.margin}px`;

canvas.width = this.pixelRatio * (parent.offsetWidth - 2 * this.margin);

canvas.height = this.pixelRatio * (parent.offsetHeight - 2 * this.margin);

canvas.style.width = `${parent.offsetWidth - 2 * this.margin}px`;

canvas.style.height = `${parent.offsetHeight - 2 * this.margin}px`;

this.ctx = canvas.getContext('2d') as CanvasRenderingContext2D;

this.pointW = canvas.width / (this.size + 1);

this.pointH = canvas.height / (this.size + 1);

this.stoneRadius = Math.min(this.pointW, this.pointH);

parent.appendChild(canvas);

}

setStone(p: Point, color: Color) {

this.stones[p.row * this.size + p.col] = color;

}

setStones(stones: Array<Color>) {

for (let i = 0; i < stones.length; ++i) {

this.stones[i] = stones[i];

}

getStone(p: Point) {

return this.stones[p.row * this.size + p.col];

}

// style is any valid canvas fill style.

setMark(p: Point, style: string) {

this.marks[p.row * this.size + p.col] = style;

}

clearMark(p: Point) {

this.marks[p.row * this.size + p.col] = null;

}

clearMarks() {

for (let i = 0; i < this.marks.length; ++i) {

this.marks[i] = null;

}

clearHeatMap() {

this.heatMap.fill(0);

this.draw();

}

setHeatMap(map: Array<number>) {

for (let i = 0; i < map.length; ++i) {

this.heatMap[i] = map[i];

}

this.draw();

}

setVariation(variation: Array<Move>) {

this.variation = variation;

this.draw();

}

clearVariation() {

this.variation = [];

this.draw();

}

draw() {

this.drawBackground();

this.drawLabels();

this.drawHeatMap();

this.drawBoardStones();

this.drawMarks();

this.drawVariation();

}

protected drawBackground() {

let ctx = this.ctx;

ctx.fillStyle = this.backgroundColor;

ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);

}

protected drawLabels() {

let ctx = this.ctx;

let n = this.size;

// Draw lines.

ctx.strokeStyle = this.lineColor;

ctx.lineWidth = this.pixelRatio;

ctx.lineCap = 'round';

ctx.beginPath();

for (let i = 0; i < n; ++i) {

let left = this.boardToCanvas(i, 0);

let right = this.boardToCanvas(i, n - 1);

let top = this.boardToCanvas(0, i);

let bottom = this.boardToCanvas(n - 1, i);

ctx.moveTo(0.5 + left.x, 0.5 + left.y);

ctx.lineTo(0.5 + right.x, 0.5 + right.y);

ctx.moveTo(0.5 + top.x, 0.5 + top.y);

ctx.lineTo(0.5 + bottom.x, 0.5 + bottom.y);

}

ctx.stroke();

// Draw star points.

ctx.fillStyle = this.lineColor;

ctx.strokeStyle = '';

for (let p of STAR_POINTS[n]) {

let c = this.boardToCanvas(p[0], p[1]);

ctx.beginPath();

ctx.arc(c.x + 0.5, c.y + 0.5, this.starPointRadius * this.pixelRatio, 0, 2 * Math.PI);

ctx.fill();

}

let textHeight = Math.floor(0.3 * this.stoneRadius);

ctx.font = `${textHeight}px sans-serif`;

if (this.labelRowCol) {

ctx.fillStyle = '#9d7c4d';

// Draw column labels.

ctx.textAlign = 'center';

ctx.textBaseline = 'alphabetic';

for (let i = 0; i < n; ++i) {

let c = this.boardToCanvas(-0.66, i);

ctx.fillText(COL_LABELS[i], c.x, c.y);

}

ctx.textBaseline = 'top';

for (let i = 0; i < n; ++i) {

let c = this.boardToCanvas(this.size - 0.33, i);

ctx.fillText(COL_LABELS[i], c.x, c.y);

}

// Draw row labels.

ctx.textAlign = 'right';

ctx.textBaseline = 'middle';

for (let i = 0; i < n; ++i) {

let c = this.boardToCanvas(i, -0.66);

ctx.fillText((n - i).toString(), c.x, c.y);

}

ctx.textAlign = 'left';

for (let i = 0; i < n; ++i) {

let c = this.boardToCanvas(i, this.size - 0.33);

ctx.fillText((n - i).toString(), c.x, c.y);

}

// Draw board caption.

if (this.caption) {

textHeight = Math.floor(0.4 * this.stoneRadius);

ctx.font = `${textHeight}px sans-serif`;

ctx.textAlign = 'center';

ctx.textBaseline = 'top';

let c = this.boardToCanvas(n - 0.45, (n - 1) / 2);

ctx.fillText(this.caption, c.x, c.y);

}

protected drawBoardStones() {

let blackStones = new Array<Point>();

let whiteStones = new Array<Point>();

let i = 0;

for (let row = 0; row < this.size; ++row) {

for (let col = 0; col < this.size; ++col) {

let color = this.stones[i++];

if (color == Color.Black) {

blackStones.push({row: row, col: col});

} else if (color == Color.White) {

whiteStones.push({row: row, col: col});

}

this.drawStones(blackStones, Color.Black, 1);

this.drawStones(whiteStones, Color.White, 1);

}

protected drawHeatMap() {

let ctx = this.ctx;

let w = this.pointW;

let h = this.pointH;

let p = {row: 0, col: 0};

let i = 0;

for (p.row = 0; p.row < this.size; ++p.row) {

for (p.col = 0; p.col < this.size; ++p.col) {

let x = this.heatMap[i];

if (this.stones[i++] != Color.Empty) {

continue;

}

if (x < 0) {

ctx.fillStyle = `rgba(255, 255, 255, ${-x}`;

} else {

ctx.fillStyle = `rgba(0, 0, 0, ${x}`;

}

let c = this.boardToCanvas(p.row, p.col);

ctx.fillRect(c.x - 0.5 * w, c.y - 0.5 * h, w, h);

}

protected drawVariation() {

// The playedCount array keeps track of the number of times each point on

// the board is played within the variation. For points that are played more

// we only show the earliest move and mark it with an asterisk.

let playedCount = new Uint16Array(this.size * this.size);

let firstPlayed = new Uint16Array(this.size * this.size);

let ctx = this.ctx;

let blackStones = new Array<Point>();

let whiteStones = new Array<Point>();

for (let i = 0; i < this.variation.length; ++i) {

let move = this.variation[i];

if (!move.p) {

continue;

}

let idx = move.p.row * this.size + move.p.col;

if (++playedCount[idx] > 1) {

continue;

}

firstPlayed[idx] = i;

if (move.color == Color.Black) {

blackStones.push(move.p);

} else {

whiteStones.push(move.p);

}

this.drawStones(blackStones, Color.Black, 0.4);

this.drawStones(whiteStones, Color.White, 0.4);

let textHeight = Math.floor(0.5 * this.stoneRadius);

ctx.font = `${textHeight}px sans-serif`;

ctx.textAlign = 'center';

ctx.textBaseline = 'middle';

for (let i = 0; i < this.variation.length; ++i) {

let move = this.variation[i];

if (!move.p) {

continue;

}

let idx = move.p.row * this.size + move.p.col;

if (firstPlayed[idx] != i) {

continue;

}

// Draw move number in the center of each stone.

ctx.fillStyle = move.color == Color.Black ? '#fff' : '#000';

let c = this.boardToCanvas(move.p.row, move.p.col);

let str = (i + 1).toString();

if (playedCount[idx] > 1) {

str += '*';

}

ctx.fillText(str, c.x, c.y);

}

protected drawMarks() {

let ctx = this.ctx;

let w = 0.2 * this.pointW;

let h = 0.2 * this.pointH;

let i = 0;

for (let row = 0; row < this.size; ++row) {

for (let col = 0; col < this.size; ++col) {

let style = this.marks[i++];

if (style == null) {

continue;

}

ctx.fillStyle = style;

let c = this.boardToCanvas(row, col);

ctx.beginPath();

ctx.arc(c.x, c.y, 0.08 * this.stoneRadius, 0, 2 * Math.PI);

ctx.fill();

}

protected setShadow(blur: number, offset: number, alpha: number) {

let ctx = this.ctx;

ctx.shadowBlur = blur * this.pixelRatio;

ctx.shadowOffsetX = offset * this.pixelRatio;

ctx.shadowOffsetY = offset * this.pixelRatio;

ctx.shadowColor = `rgba(0, 0, 0, ${alpha})`;

}

protected drawStones(ps: Array<Point>, color: Color, alpha: number) {

if (ps.length == 0) {

return;

}

let ctx = this.ctx;

if (color != Color.Black && color != Color.White) {

throw new Error(`Can't draw stones with color ${color}`);

}

if (alpha == 1) {

this.setShadow(4, 1.5, color == Color.Black ? 0.4 : 0.3);

}

if (color == Color.Black) {

ctx.fillStyle = this.blackFill(alpha);

} else {

ctx.fillStyle = this.whiteFill(alpha);

}

let r = 0.48 * this.stoneRadius;

for (let p of ps) {

let c = this.boardToCanvas(p.row, p.col);

ctx.beginPath();

ctx.translate(c.x, c.y);

ctx.arc(0, 0, r, 0, 2 * Math.PI);

ctx.fill();

ctx.setTransform(1, 0, 0, 1, 0, 0);

}

if (alpha == 1) {

this.setShadow(0, 0, 0);

}

protected canvasToBoard(x: number, y: number, threshold?: number): Point | null {

y = y * (this.size + 1) / this.ctx.canvas.height - 0.5;

x = x * (this.size + 1) / this.ctx.canvas.width - 0.5;

let row = Math.floor(y);

let col = Math.floor(x);

if (row < 0 || row >= this.size || col < 0 || col >= this.size) {

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};

}

protected boardToCanvas(row: number, col: number) {

return {

x: this.ctx.canvas.width * (col + 1.0) / (this.size + 1),

y: this.ctx.canvas.height * (row + 1.0) / (this.size + 1)

};

}

protected blackFill(alpha: number) {

let ofs = -0.25 * this.stoneRadius;

let grad = this.ctx.createRadialGradient(

ofs, ofs, 0, ofs, ofs, this.stoneRadius);

grad.addColorStop(0, `rgba(68, 68, 68, ${alpha})`);

grad.addColorStop(1, `rgba(16, 16, 16, ${alpha})`);

return grad;

}

protected whiteFill(alpha: number) {

let ofs = -0.1 * this.stoneRadius;

let grad = this.ctx.createRadialGradient(

ofs, ofs, 0, ofs, ofs, 0.6 * this.stoneRadius);

grad.addColorStop(0.4, `rgba(255, 255, 255, ${alpha})`);

grad.addColorStop(1, `rgba(204, 204, 204, ${alpha})`);

return grad;

}

class ClickableBoard extends Board {

protected p: Point | null;

protected listeners = new Array<(p: Point) => void>();

public enabled = false;

constructor(parent: HTMLElement | string, public size: BoardSize, options: BoardOptions = {}) {

super(parent, size, options);

this.ctx.canvas.addEventListener('mousemove', (e) => {

let p = this.canvasToBoard(

e.offsetX * this.pixelRatio, e.offsetY * this.pixelRatio, 0.4);

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) => {

this.p = null;

this.draw();

});

this.ctx.canvas.addEventListener('click', (e) => {

if (!this.p || !this.enabled) {

return;

}

for (let listener of this.listeners) {

listener 49A9 (this.p);

}

this.p = null;

});

}

onClick(cb: (p: Point) => void) {

this.listeners.push(cb);

}

draw() {

super.draw();

let p = this.enabled ? this.p : null;

this.ctx.canvas.style.cursor = p ? 'pointer' : null;

if (p) {

this.drawStones([p], this.toPlay, 0.6);

}

export {

Board,

BoardOptions,

BoardSize,

ClickableBoard,

COL_LABELS,

Color,

Move,

Point,

otherColor,

};

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