makeStars（）;

功能makeStars（）：无效
{
    //获取星资产
    变种S：StarAsset =新StarAsset（）;

    //拷贝星资产为位图数据
    变种BD：的BitmapData =新的BitmapData（s.width，s.height，真实，为0x0）;
    bd.draw（多个）;

    //借鉴的BitmapData 100变种
    对于（VAR我：UINT = 0; I＆LT; 100;我++）
    {
        VAR位X：数=的Math.random（）* 600;
        VAR positionY：数=的Math.random（）* 600;
        VAR规模：数=的Math.random（）;
        VAR角度：数=的Math.random（）* 360;

        VAR矩阵：矩阵=新的Matrix（）;
        matrix.scale（秤，秤）;
        matrix.rotate（角* Math.PI / 180）;
        matrix.translate（位X，positionY）;

        canvas.draw（BD，矩阵，NULL，NULL，NULL，TRUE）;
    }
}
 

主要生产：

在这里还是1000恒星绘制：

终于还是万星被吸引：

I am trying to draw something on the screen and then, copy that onto a bitmap which is on stage.

I have done this before, with a procedurally drawn shape like a circle but when I use a library item most of the source pixels get cut off.

here's my code - in another function the bitmap object is added to the stage and I can see that copyPixels work but as I have said copies only some of the pixels. I have tried playing with the Rectangle but no luck so far.

var s:StarAsset = new StarAsset();

        s.x = e.stageX;
        s.y = e.stageY;
        s.scaleX = e.pressure * 10;
        s.scaleY = e.pressure * 10;
        s.rotation = Math.random() * 360;



        var bms:BitmapData = new BitmapData(s.width + 6, s.height + 6, true, 0x00000000);
        bms.draw(s);

        var srect:Rectangle = new Rectangle();
        srect.width = s.width + 6;
        srect.height = s.height + 6;

        var destpoint:Point = new Point(s.x, s.y);
        bmcontainer.copyPixels(bms, srect, destpoint, null, null, true);

Using a star asset:

And assuming your are blitting to a canvas bitmap on the stage:

var canvas:BitmapData = new BitmapData(600, 600, true, 0x0);
var bitmap:Bitmap = new Bitmap(canvas, PixelSnapping.AUTO, true);
addChild(bitmap);

This implementation would instantiate your StarAsset, draw it to BitmapData, and then randomly transform scale, position, and rotation per copy drawn to the canvas:

makeStars();

function makeStars():void
{
    // get the star asset
    var s:StarAsset = new StarAsset();

    // copy star asset to bitmap data
    var bd:BitmapData = new BitmapData(s.width, s.height, true, 0x0);
    bd.draw(s);

    // draw 100 variants on BitmapData
    for(var i:uint = 0; i < 100; i++)
    {
        var positionX:Number = Math.random() * 600;
        var positionY:Number = Math.random() * 600;
        var scale:Number = Math.random();
        var angle:Number = Math.random() * 360;

        var matrix:Matrix = new Matrix();
        matrix.scale(scale, scale);
        matrix.rotate(angle * Math.PI / 180);
        matrix.translate(positionX, positionY);

        canvas.draw(bd, matrix, null, null, null, true);
    }
}

Which produces:

Or here 1,000 stars are drawn:

Or finally 10,000 stars are drawn: