BitmapData.draw() failing to draw entire MovieClip

Question

Hi, all;
I'm trying to do some lean blitting for an object that rotates by rotating it once at startup and capturing a BitmapData snapshot of each 5 degrees.  The problem I'm having is that the draw() method of the BitmapData object is only picking up pixels in the MovieClip that are below and to the right of the registration point.  If I change the MC so that the registration point is in the top left corner, I sometimes get what looks like most of the pixels, but the entire object rotates into and out of the frame, since it's rotating around the corner and not the center.
Has anyone encountered this before, and if so is there a fix?
Thanks;
Amy Blankenship
flexdiary.blogspot.com

Answer 1

I think you're misunderstanding the question.  I am using a matrix to transform it, and that lower right quadrant of the MovieClip rotates perfectly as inended, but the rest of the object isn't captured as if it weren't there.
Here's the code:
package com.magnoliamultimedia.datastructures
import flash.display.BitmapData;
import flash.display.IBitmapDrawable;
import com.magnoliamultimedia.datastructures.IChain;
import com.magnoliamultimedia.datastructures.IChainable;
import flash.geom.Matrix;
import flash.geom.Rectangle;
  * RotationChain takes an IBitmapDrawable and rotates
  * it through 360 degrees, creating a BitmapDataLink
  * for each incremental rotation
  * @author Amy Blankenship
public class RotationChain implements IChain
  //private storage for the chain entry point
  private var _defaultNode:IChainable;
   * Constructor
   * @param rotatingObj object to rotate
   * @param degrees number of degrees to rotate (must divide evenly into 360)
  public function RotationChain(rotatingObj:IBitmapDrawable, degrees:int=5, size:int=200)
   //first, check if degrees divides evenly into 360
   if (360 % degrees != 0) {
    throw new Error('Degrees must divide evenly into 360');
    //set to the default, so we still have a usable chain
    degrees = 5;
   var matrix:Matrix = new Matrix();
   var bd:BitmapData;
   var bdl:BitmapDataLink;
   var lastBDL:BitmapDataLink;
   var loops:int = 360 / degrees - 1;
   for (var i:int = 0; i < loops; i++) {
    /* Take "snapshot" of rotating obj with matrix applied.
     *  On the first loop, use the identity matrix.
    bd = new BitmapData(size, size);
    bd.draw(rotatingObj, matrix);
    bdl = new BitmapDataLink(bd);
    //check for any previous links that might have been added
    if (lastBDL == null) {
     //no? this is the default
     defaultNode = bdl;
    } else {
     //set up reciprocal arrangement with last node
     bdl.previous = lastBDL;
     lastBDL.next = bdl;
    //set this link as the last link
    lastBDL = bdl;
    //rotate next snapshot
    matrix.rotate(degrees);
   //connect the last link to the first link to make a circular chain
   lastBDL.next = defaultNode;
   defaultNode.previous = lastBDL;
  /* INTERFACE com.magnoliamultimedia.datastructures.IChain */
  public function get defaultNode():IChainable
   return _defaultNode;
  public function set defaultNode(value:IChainable):void
   _defaultNode = value;
Is there anyone out there who does this kind of stuff?
Thanks;
Amy