【typescript】两个物品围绕旋转效果

记录一下旋转的原理，使用计时器来移动坐标，或者改为按帧移动也可。

代码里的对象或其他接口，能看得懂就行，就不贴上来了。

效果：

	private _circleCenter = {x: 279, y: 229};//中心，订半径
	private _aPos = {x: 155, y: 80};//椭圆度(x越大，横向偏移越大)
	private _eff1: UIEffect;
	private _eff2: UIEffect;
	private _angle: number = 0;
	private _speedTime: number = 20;//速度（多少时间毫秒执行一次位置移动）
	private _speedPos: number = 3;//速度（一个时间单位内执行多少角度的位置移动）

	/**展示绕圈特效*/
	private showBallsEff(){
                //第一个物品
		this._eff1 = EffectManager.getInstance().showEffect(UrlUtil.getCommonEffectURL("lymarkeff"),0, 0, this.g_actEff,  40, true);
                //第二个物品
		this._eff2 = EffectManager.getInstance().showEffect(UrlUtil.getCommonEffectURL("lymarkeff"),0, 0, this.g_actEff,  40, true);
                //如果还没有计时器，添加一个
		if (!(TimerManager.getInstance().has(this._speedTime, this.showCircle, this))){
			TimerManager.getInstance().add(this._speedTime, this.showCircle, this);
		}
	}

	/**展示绕圈 计算角度*/
	private showCircle(){
		let a = this;
		a._angle += a._speedPos;
		if(a._angle >= 360){
			a._angle = 0;
		}
		let pos = a._angle * Math.PI / 180;
		let pos2 = (180 + a._angle) * Math.PI / 180;
		a._eff1.x = Math.ceil(a._aPos.x * Math.cos(pos) + a._circleCenter.x);
		a._eff1.y = Math.ceil(a._aPos.y * Math.sin(pos) + a._circleCenter.y);
		a._eff2.x = Math.ceil(a._aPos.x * Math.cos(pos2) + a._circleCenter.x);
		a._eff2.y = Math.ceil(a._aPos.y * Math.sin(pos2) + a._circleCenter.y);

		//当旋转到中心图片后面时候切换层次
		if(a._angle > 200 && a._angle < 340){
			if(a.g_actEff.getChildIndex(a._eff1.content) != 0){
				a.g_actEff.setChildIndex(a._eff1.content, 0);
			}
			if(a.g_actEff.getChildIndex(a._eff2.content) != a.g_actEff.numChildren){
				a.g_actEff.setChildIndex(a._eff2.content, a.g_actEff.numChildren);
			}
		}
		else{
			if(a.g_actEff.getChildIndex(a._eff2.content) != 0){
				a.g_actEff.setChildIndex(a._eff2.content, 0);
			}
			if(a.g_actEff.getChildIndex(a._eff1.content) != a.g_actEff.numChildren){
				a.g_actEff.setChildIndex(a._eff1.content, a.g_actEff.numChildren);
			}
		}
		// console.log(pos, a._eff1.x, a._eff1.y,"-------------", a._angle, a.g_actEff.getChildIndex(a.img_mainRing), a.g_actEff.getChildIndex(this._eff1.content));
	}