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Copy pathgraph.ts
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200 lines (172 loc) · 5.79 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 {getElement} from './util'
type MoveChangedCallback = (move: number | null) => void;
class Graph {
protected ctx: CanvasRenderingContext2D;
protected points = new Array<[number, number]>();
protected pixelRatio = window.devicePixelRatio || 1;
protected marginTop = 20 * this.pixelRatio;
protected marginBottom = 20 * this.pixelRatio;
protected marginLeft = 30 * this.pixelRatio;
protected marginRight = 60 * this.pixelRatio;
protected minPoints = 10;
protected w: number;
protected h: number;
protected selectedMove: number | null = null;
protected moveChangedCallback: MoveChangedCallback | null = null;
constructor(parent: HTMLElement | string) {
if (typeof(parent) == 'string') {
parent = getElement(parent);
}
let canvas = do
8000
cument.createElement('canvas');
canvas.width = this.pixelRatio * parent.offsetWidth;
canvas.height = this.pixelRatio * parent.offsetHeight;
canvas.style.width = `${parent.offsetWidth}px`;
canvas.style.height = `${parent.offsetHeight}px`;
this.ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
this.w = canvas.width - this.marginLeft - this.marginRight;
this.h = canvas.height - this.marginTop - this.marginBottom;
parent.appendChild(canvas);
canvas.addEventListener('mousemove', (e) => {
this.onMouseMove(e.offsetX, e.offsetY);
});
canvas.addEventListener('mouseleave', () => {
this.onMouseLeave();
});
this.draw();
}
clear() {
this.points = [];
this.draw();
}
// Sets the graph value for the given move number.
setMoveScore(move: number, value: number) {
this.points[move] = [move, value];
}
onMoveChanged(callback: MoveChangedCallback) {
this.moveChangedCallback = callback;
}
draw() {
let ctx = this.ctx;
let w = this.w;
let h = this.h;
let xScale = Math.max(this.points.length - 1, this.minPoints);
// Reset the transform to identity and clear.
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
// Apply a translation such that (0, 0) is the center of the pixel at the
// top left of the graph.
ctx.translate(this.marginLeft + 0.5, this.marginTop + 0.5);
// Round caps & joins look nice.
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
// Draw the resign threshold lines.
ctx.lineWidth = 1 * this.pixelRatio;
ctx.strokeStyle = '#56504b';
ctx.beginPath();
ctx.moveTo(0, Math.round(0.95 * h));
ctx.lineTo(w, Math.round(0.95 * h));
ctx.moveTo(0, Math.round(0.05 * h));
ctx.lineTo(w, Math.round(0.05 * h));
ctx.stroke();
// Draw the horizontal & vertical axis.
let lineWidth = 3 * this.pixelRatio;
ctx.lineWidth = lineWidth;
ctx.strokeStyle = '#96928f';
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(0, h);
ctx.moveTo(0, 0.5 * h);
ctx.lineTo(w, 0.5 * h);
ctx.stroke();
// Draw the Y axis labels.
let textHeight = 14 * this.pixelRatio;
ctx.font = `${textHeight}px sans-serif`;
ctx.fillStyle = '#96928f';
ctx.textAlign = 'right';
ctx.textBaseline = 'middle';
ctx.fillText('B', -0.5 * textHeight, Math.round(0.05 * h));
ctx.fillText('W', -0.5 * textHeight, Math.round(0.95 * h));
// Offset the start of the X axis by the widh of the vertical axis.
// It looks nicer that way.
let xOfs = Math.floor(lineWidth / 2);
ctx.translate(xOfs, 0);
w -= xOfs;
// Draw the selected move (if any).
if (this.selectedMove !== null) {
let x = Math.round(w * this.selectedMove / xScale);
ctx.lineWidth = 1;
ctx.strokeStyle = '#96928f';
ctx.beginPath();
ctx.moveTo(x, 0);
ctx.lineTo(x, h);
ctx.stroke();
}
// Draw the graph.
if (this.points.length >= 2) {
ctx.lineWidth = lineWidth;
ctx.strokeStyle = '#eee';
ctx.beginPath();
let [x, y] = this.points[0];
ctx.moveTo(w * x / xScale, h * (0.5 - 0.5 * y));
for (let i = 1; i < this.points.length; ++i) {
[x, y] = this.points[i];
ctx.lineTo(w * x / xScale, h * (0.5 - 0.5 * y));
}
ctx.stroke();
}
// Draw the value label.
ctx.textAlign = 'left';
ctx.fillStyle = '#ffe';
let y;
if (this.points.length > 0) {
y = this.points[this.points.length - 1][1];
} else {
y = 0;
}
let score = y;
y = h * (0.5 - 0.5 * y);
let txt: string;
if (score > 0) {
txt = `B:${Math.round(score * 100)}%`;
} else {
txt = `W:${Math.round(-score * 100)}%`;
}
ctx.fillText(txt, w + 8, y);
}
private onMouseMove(x: number, y: number) {
if (this.points.length < 2) {
return;
}
let n = Math.max(this.minPoints, this.points.length - 1);
let newMove = Math.round(n * (this.pixelRatio * x - this.marginLeft) / this.w);
newMove = Math.max(0, Math.min(newMove, this.points.length - 1));
if (newMove != this.selectedMove) {
this.selectedMove = newMove;
this.draw();
if (this.moveChangedCallback) {
this.moveChangedCallback(this.selectedMove);
}
}
}
private onMouseLeave() {
this.selectedMove = null;
this.draw();
if (this.moveChangedCallback) {
this.moveChangedCallback(this.selectedMove);
}
}
}
export {Graph}