echarts PointerPath 源码
echarts PointerPath 代码
文件路径：/src/chart/gauge/PointerPath.ts
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 Path, { PathProps } from 'zrender/src/graphic/Path';
class PointerShape {
angle = 0;
width = 10;
r = 10;
x = 0;
y = 0;
}
interface PointerPathProps extends PathProps {
shape?: Partial<PointerShape>
}
export default class PointerPath extends Path<PointerPathProps> {
readonly type = 'pointer';
shape: PointerShape;
constructor(opts?: PointerPathProps) {
super(opts);
}
getDefaultShape() {
return new PointerShape();
}
buildPath(ctx: CanvasRenderingContext2D, shape: PointerShape) {
const mathCos = Math.cos;
const mathSin = Math.sin;
const r = shape.r;
const width = shape.width;
let angle = shape.angle;
const x = shape.x - mathCos(angle) * width * (width >= r / 3 ? 1 : 2);
const y = shape.y - mathSin(angle) * width * (width >= r / 3 ? 1 : 2);
angle = shape.angle - Math.PI / 2;
ctx.moveTo(x, y);
ctx.lineTo(
shape.x + mathCos(angle) * width,
shape.y + mathSin(angle) * width
);
ctx.lineTo(
shape.x + mathCos(shape.angle) * r,
shape.y + mathSin(shape.angle) * r
);
ctx.lineTo(
shape.x - mathCos(angle) * width,
shape.y - mathSin(angle) * width
);
ctx.lineTo(x, y);
}
}
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