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20 lines
597 B
20 lines
597 B
// js 贝塞尔曲线函数
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export default class Bezier {
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// 输入起始点和结束点的坐标
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constructor(p1x, p1y, p2x, p2y) {
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this.cx = 3.0 * p1x;
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this.bx = 3.0 * (p2x - p1x) - this.cx;
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this.ax = 1.0 - this.cx - this.bx;
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this.cy = 3.0 * p1y;
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this.by = 3.0 * (p2y - p1y) - this.cy;
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this.ay = 1.0 - this.cy - this.by;
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}
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//贝赛尔曲线t时刻的坐标点的X坐标
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curveX(t) {
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return ((this.ax * t + this.bx) * t + this.cx) * t;
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}
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//贝赛尔曲线t时刻的坐标点的y坐标
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curveY(t) {
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return ((this.ay * t + this.by) * t + this.cy) * t;
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}
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}
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