egret基础-坐标转换


class Tolocal extends egret.DisplayObjectContainer {
private static shared:Tolocal;
public static getInstance(){
if(!Tolocal.shared){
Tolocal.shared = new Tolocal();
}else{
return Tolocal.shared
}
}
public constructor() {
super();
this.addEventListener(egret.Event.ADDED_TO_STAGE, this.starGame, this)
}
private container: egret.DisplayObjectContainer
private circle: egret.Shape
private starGame(): void {
this.container = new egret.DisplayObjectContainer();
this.container.x = 200;
this.container.y = 200;
this.addChild(this.container);
//画一个红色的圆，添加到 container 中
this.circle = new egret.Shape();
this.circle.graphics.beginFill(0xff0000);
this.circle.graphics.drawCircle(25, 25, 25);
this.circle.graphics.endFill();
this.container.addChild(this.circle);
//给圆增加点击事件
this.circle.touchEnabled = true;
this.circle.addEventListener(egret.TouchEvent.TOUCH_TAP, this.onClick, this);
}
private onClick(): void {
//把舞台左上角的坐标(0,0)转换为 container 内部的坐标
var targetPoint: egret.Point = this.container.globalToLocal(100, 150);
//将局部的circle坐标转换为全局的坐标
console.log(targetPoint.x,targetPoint.y)
//重新定位圆，可以看到圆形移到了屏幕的左上角
this.circle.x = targetPoint.x;
this.circle.y = targetPoint.y;
}
}



this.addChild( Tolocal.getInstance() );