echarts sausage 源码
echarts sausage 代码
文件路径：/src/util/shape/sausage.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} from '../graphic';
import { PathProps } from 'zrender/src/graphic/Path';
/**
* Sausage: similar to sector, but have half circle on both sides
*/
class SausageShape {
cx = 0;
cy = 0;
r0 = 0;
r = 0;
startAngle = 0;
endAngle = Math.PI * 2;
clockwise = true;
}
interface SausagePathProps extends PathProps {
shape?: SausageShape
}
class SausagePath extends Path<SausagePathProps> {
type = 'sausage';
constructor(opts?: SausagePathProps) {
super(opts);
}
getDefaultShape() {
return new SausageShape();
}
buildPath(ctx: CanvasRenderingContext2D, shape: SausageShape) {
const cx = shape.cx;
const cy = shape.cy;
const r0 = Math.max(shape.r0 || 0, 0);
const r = Math.max(shape.r, 0);
const dr = (r - r0) * 0.5;
const rCenter = r0 + dr;
let startAngle = shape.startAngle;
const endAngle = shape.endAngle;
const clockwise = shape.clockwise;
const PI2 = Math.PI * 2;
const lessThanCircle = clockwise
? endAngle - startAngle < PI2
: startAngle - endAngle < PI2;
if (!lessThanCircle) {
// Normalize angles
startAngle = endAngle - (clockwise ? PI2 : -PI2);
}
const unitStartX = Math.cos(startAngle);
const unitStartY = Math.sin(startAngle);
const unitEndX = Math.cos(endAngle);
const unitEndY = Math.sin(endAngle);
if (lessThanCircle) {
ctx.moveTo(unitStartX * r0 + cx, unitStartY * r0 + cy);
ctx.arc(
unitStartX * rCenter + cx, unitStartY * rCenter + cy, dr,
-Math.PI + startAngle, startAngle, !clockwise
);
}
else {
ctx.moveTo(unitStartX * r + cx, unitStartY * r + cy);
}
ctx.arc(cx, cy, r, startAngle, endAngle, !clockwise);
ctx.arc(
unitEndX * rCenter + cx, unitEndY * rCenter + cy, dr,
endAngle - Math.PI * 2, endAngle - Math.PI, !clockwise
);
if (r0 !== 0) {
ctx.arc(cx, cy, r0, endAngle, startAngle, clockwise);
}
// ctx.closePath();
}
}
export default SausagePath;
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