mirror of
https://github.com/Leo501/CocosCreatorTutorial.git
synced 2026-05-08 14:48:40 +08:00
68 lines
2.0 KiB
JavaScript
68 lines
2.0 KiB
JavaScript
cc.Class({
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extends: cc.Component,
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properties: {
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nodeTarget: cc.Node,
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r: 0,
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speed: 0,
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boxLength: 0,
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},
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onLoad() {
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this.halfBoxLength = parseInt(this.boxLength / 2);
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this.perimeter = 0;
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this.perimeterMax = this.boxLength * 2 + this.r * 2 * Math.PI;
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},
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registerEvent() {
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},
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init(data) {
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},
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/**
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* 原理：距离s=时间t*速度v
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* 实现 -- 分割为四部分
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* 第一部分 -- 0到500为右直线
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* 第二部分 -- 500到500+PI*r为上半圆
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* 第三部分 -- 500+PI*r到1000+PI*r为左直线
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* 第四部分 -- 最后1000+2PI*4为下半圆
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* @param {*} dt
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* @param {*} speed
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*/
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getPointByPerimeter(dt, speed) {
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this.perimeter += dt * speed;
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this.perimeter %= this.perimeterMax;
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let point = cc.v2(0, 0);
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if (this.perimeter <= this.boxLength) {
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point.x = this.r;
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point.y = -this.halfBoxLength + this.perimeter;
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} else if (this.perimeter <= (this.boxLength + Math.PI * this.r)) {
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let length = this.perimeter - this.boxLength;
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let radian = length / this.r;
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point.x = this.r * Math.cos(radian);
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point.y = this.halfBoxLength + this.r * Math.sin(radian);
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} else if (this.perimeter <= (2 * this.boxLength + Math.PI * this.r)) {
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point.x = -this.r;
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point.y = this.halfBoxLength - (this.perimeter - this.boxLength - Math.PI * this.r);
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} else {
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let length = this.perimeter - 2 * this.boxLength;
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let radian = length / this.r;
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point.x = this.r * Math.cos(radian);
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point.y = -this.halfBoxLength + this.r * Math.sin(radian);
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}
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return point;
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},
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update(dt) {
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// let point = this.nodeTarget.getPosition();
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let movePoint = this.getPointByPerimeter(dt, this.speed);
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this.nodeTarget.setPosition(movePoint);
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},
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/**
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* 统一回收组件
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*/
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onDestroy() {
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}
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}); |