Drawing small sprite to large bitmap

[Rolf_Rahbek]

Hi

I have a spirte circSprite that I draw on a large bitmap drawingBitmap.

drawingBitmapData = new BitmapData(800, 600, true,0);

drawingBitmap = new Bitmap(drawingBitmapData);

stage.addChild(drawingBitmap);

var circSprite:Sprite = new Sprite();

circSprite.graphics.beginFill(0xFF0000,0);

circSprite.graphics.drawRect(0,0,160,160);

circSprite.graphics.endFill();

circSprite.graphics.beginFill(0xFF00FF,1);

circSprite.graphics.drawCircle(40,40,40);

circSprite.graphics.endFill();

var mat:Matrix = new Matrix();

drawingBitmapData.drawWithQuality(circSprite,mat,null,null, null,true,StageQuality.MEDIUM);

I would like to move the circSpirte to a different position ( 100,100 ) - how can I do that?

Thanks!

Rolf

[kglad · Accepted solution]

update the matrix:

var rect:Rectangle=new Rectangle(0,0,800,600);

var bgColor:uint = 0xffffff;  //<- use your stage color

mat.tx+=3;

drawingBitmapData.fillRect(rect,bgColor);  //<- to make it look like the previously drawn object(s) were erased

drawingBitmapData.drawWithQuality(circSprite,mat,null,null, null,true,StageQuality.MEDIUM);

[Rolf_Rahbek]

Hi kglad

Thanks, that worked! Had to remove this part of the code because otherwice the circle was cut off. It kinda working as a mask?

circSprite.graphics.beginFill(0xFF0000,0);

circSprite.graphics.drawRect(0,0,160,160);

circSprite.graphics.endFill();

Anyway, thanks a lot

[kglad]

you're welcome.

p.s. rob's suggestion would work too but is not the approach you should take if you wanted to "animate" your circle.  the code i suggested is the typical blitting code used to make it appear a blitted object is animated.

[robdillon]

The drawCircle function takes 3 arguments, the x position, the y position and the radius, so if you want the circle at 100, 100, then just change that line to:

circSprite.graphics.drawCircle(100,100,40);