/**
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* 内外旋轮曲线
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* @module zrender/graphic/shape/Trochold
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*/
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import Path, { PathProps } from '../Path';
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const cos = Math.cos;
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const sin = Math.sin;
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export class TrochoidShape {
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cx = 0
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cy = 0
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r = 0
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r0 = 0
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d = 0
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location = 'out'
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}
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export interface TrochoidProps extends PathProps {
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shape?: Partial<TrochoidShape>
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}
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class Trochoid extends Path<TrochoidProps> {
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shape: TrochoidShape
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constructor(opts?: TrochoidProps) {
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super(opts);
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}
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getDefaultStyle() {
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return {
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stroke: '#000',
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fill: null as string
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};
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}
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getDefaultShape() {
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return new TrochoidShape();
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}
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buildPath(ctx: CanvasRenderingContext2D, shape: TrochoidShape) {
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const R = shape.r;
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const r = shape.r0;
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const d = shape.d;
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const offsetX = shape.cx;
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const offsetY = shape.cy;
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const delta = shape.location === 'out' ? 1 : -1;
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let x1;
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let y1;
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let x2;
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let y2;
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if (shape.location && R <= r) {
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return;
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}
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let num = 0;
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let i = 1;
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let theta;
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x1 = (R + delta * r) * cos(0)
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- delta * d * cos(0) + offsetX;
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y1 = (R + delta * r) * sin(0)
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- d * sin(0) + offsetY;
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ctx.moveTo(x1, y1);
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// 计算结束时的i
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do {
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num++;
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}
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while ((r * num) % (R + delta * r) !== 0);
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do {
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theta = Math.PI / 180 * i;
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x2 = (R + delta * r) * cos(theta)
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- delta * d * cos((R / r + delta) * theta)
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+ offsetX;
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y2 = (R + delta * r) * sin(theta)
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- d * sin((R / r + delta) * theta)
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+ offsetY;
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ctx.lineTo(x2, y2);
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i++;
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}
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while (i <= (r * num) / (R + delta * r) * 360);
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}
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}
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Trochoid.prototype.type = 'trochoid';
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export default Trochoid;
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