/**

 * 圆形进度

 * @author chenkai 2018/8/10

 */

class CircleProgress{

	private target:egret.DisplayObject;  //遮罩的目标

	private shape:egret.Shape;           //遮罩

	private anticlockwise:boolean;       //true逆时针 false顺时针

	private dic:number;                  //角度增加方向

	/**

	 * (anticlockwise, dic)  (false,1)顺时针显示对象  (true,1)顺时针隐藏对象  (true,-1)逆时针显示对象 (false,-1)逆时针隐藏对象

	 * @param target 遮罩的对象

	 * @param anticlockwise

	 * @param dic

	 */

	public constructor(target:egret.DisplayObject, anticlockwise:boolean, dic:number){

		this.target = target;

		this.shape = new egret.Shape();

		this.shape.x = this.target.x + this.target.width/2;

		this.shape.y = this.target.y + this.target.height/2;

		target.parent && target.parent.addChild(this.shape);

		this.target.mask = this.shape;

		this.anticlockwise = anticlockwise;

		this.dic = dic;

	}

	/**

	 * 绘制进度

	 * @param value 0-1  进度

	 * @param offerAngle 角度偏移值,默认从0度开始画

	 */

	public drawProgress(value:number, offerAngle:number = 0){

		if(value > 1){

			value = 1;

		}

        var r = Math.max(this.target.width/2, this.target.height/2) / 2 * 1.5;

		let startAngle = offerAngle;

		let endAngle = (360*value + offerAngle)*this.dic;

		this.shape.graphics.clear();

		this.shape.graphics.beginFill(0x00ffff, 1);

		this.shape.graphics.lineTo(r, 0);

		this.shape.graphics.drawArc(0, 0, r, startAngle*Math.PI/180, endAngle * Math.PI / 180, this.anticlockwise);

		this.shape.graphics.lineTo(0, 0);

		this.shape.graphics.endFill();

    }

	//销毁

	public destroyMe(){

		this.target = null;

	}

}

let progress = new CircleProgress(this.clock,false,1);

progress.drawProgress(1/10);