Yes, you can copy only the visible pixels of a bitmap.
To do this, you must pass the optional AlphaBitmap parameter for
copyPixels:
public copyPixels(sourceBitmap:BitmapData, sourceRect:Rectangle,
destPoint:Point, [alphaBitmap:BitmapData], [alphaPoint:Point],
[mergeAlpha:Boolean]) : Void
piece_bd.copyPixels(piece_mc,new
Rectangle(xPos,yPos,subPicture.width-borderSize*2,subPicture.height-
borderSize*2),new
Point(borderSize,borderSize), ALPHA BITMAP);
I'm not sure what's going on in your code, so I can't say what should
be the ALPHA BITMAP, piece_mc?
If you do that, the copied parts of piece_mc would be basically "self-
masked."
On Oct 19, 2006, at 8:01 AM, flashcoders-
[EMAIL PROTECTED] wrote:
Thanks the help everyone.
Ok i'm slowly getting my head around this bitdata.
If I wanted to mask a bg pic using setmask.
Can i then copy the visible area using copypixels? and use this a
fixed image ("snapshot") ? Seem to be stuck a little
here is my code as far:-
import flash.display.BitmapData;
import flash.geom.Point;
import flash.geom.Rectangle;
//create blank movieclip, create bd object. put pic into bd object,
then put object into movieclip.
var picture:BitmapData = BitmapData.loadBitmap("rawbg");
_root.createEmptyMovieClip("pictureMc",this.getNextHighestDepth());
pictureMc.attachBitmap(picture,1);
///
//create blank mc, attach piecepic to mc.
piece_mc = this.createEmptyMovieClip("orig",
this.getNextHighestDepth());
piece_mc.attachMovie("piece0",piece0,this.getNextHighestDepth());
//
// create bd for peice. draw the piece into the bd object.
piece_bd = new BitmapData (this.piece_mc.width,
this.piece_mc.height, true);
piece_bd.draw (this.piece_mc, this.matrix);
//apply mask
pictureMc.setMask(_root.piece_mc)
//HELP HERE - I dont understand this section, althougj think i'm on
the right lines.
piece_bd.copyPixels(piece_mc,new
Rectangle(xPos,yPos,subPicture.width-borderSize*2,subPicture.height-
borderSize*2),new
Point(borderSize,borderSize));
//drag the fixed snapshot piece around
piece_mc.onRelease = function() {
this.startDrag();
}
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