egret 简单的截屏操作，三种图形渲染方式

所谓截屏就是将当前画面保存下来，只需两行代码

//截屏操作
            let render = new egret.RenderTexture();
            let rootLayer = this;
            render.drawToTexture(rootLayer);//rootLayer是当前显示层的总容器，或者用this.stage
            let base64Str = render.toDataURL("image/png");
            render.saveToFile("image/png", "aa.png");//也可以保存下来

 白鹭图形渲染三种方式

 icon.blendMode = egret.BlendMode.NORMAL;//默认模式, 覆盖效果
         icon.blendMode = egret.BlendMode.ADD; //溶解效果
         icon.blendMode = egret.BlendMode.ERASE;//擦除效果

this.addChild(icon);

滤镜中的投影滤镜

//白色背景
        var bg: egret.Sprite = new egret.Sprite();
        bg.graphics.beginFill(0xffffff);
        bg.graphics.drawRect(0, 0, this.stage.stageWidth, this.stage.stageHeight);
        bg.graphics.endFill();
        this.addChild(bg);

        var bmp: egret.Bitmap = new egret.Bitmap(RES.getRes("mario_png"));
        this.addChild(bmp);

        var bmp2: egret.Bitmap = new egret.Bitmap(RES.getRes("mario_png"));
        bmp2.y = 400;
        this.addChild(bmp2);

        //投影滤镜
        var shadowFilter: egret.DropShadowFilter = new egret.DropShadowFilter(40, 60, 0x000000, 0.8, 16, 16, 0.6, egret.BitmapFilterQuality.LOW, false, false);
        bmp2.filters = [shadowFilter];