topical media & game development
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#graphic-flex-image-effects-03-Flex-SetPixelsTest.ax

#graphic-flex-image-effects-03-Flex-SetPixelsTest.ax [swf] [flash] flex 


  package {
  
          import flash.display.Bitmap;
          import flash.display.BitmapData;
          import flash.geom.Rectangle;
          import flash.utils.ByteArray;
  
          [SWF(width=1200, height=600, backgroundColor=0x000000)]
Combines two images by drawing alternating rows from each image using getPixels()/setPixels(). 

  
          public class @ax-graphic-flex-image-effects-03-Flex-SetPixelsTest extends graphic_flex_image_effects_03_Flex_DualImageTest {
Called after images load by super class. This uses getPixels()/setPixels() to draw alternating rows of loaded bitmaps into new image. 

  
                  override protected function operateOnImages():void {
                          var width:uint = _bitmapData0.width;
                          var height:uint = _bitmapData0.height;
                          var newData:BitmapData = new BitmapData(width, height);
                          // the rectangle that will be used to draw a row
                          var rect:Rectangle = new Rectangle(0, 0, width, 1);
                          var bitmapData:BitmapData;
                          var bytes:ByteArray;
                          // runs through full height of loaded images
                          for (var row:uint = 0; row < height; row++) {
                                  // alternates which image to draw the data from based on even/odd rows
                                  bitmapData = (row % 2) == 0 ? _bitmapData0 : _bitmapData1;
                                  rect.y = row;
                                  bytes = bitmapData.getPixels(rect);
                                  // necessary to set byte array back to 0 before reading in
                                  bytes.position = 0;
                                  newData.setPixels(rect, bytes);
                          }
                          // add the new bitmap
                          var bitmap:Bitmap = new Bitmap(newData);
                          addChild(bitmap);
                          bitmap.x = _bitmap1.x + _bitmap1.width;
                  }
  
          }
  
  }
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 04/09/2009

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