topical media & game development
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#graphic-flex-image-effects-04-Flex-PixelDissolveTest.ax

#graphic-flex-image-effects-04-Flex-PixelDissolveTest.ax [swf] [flash] flex 


  package {
  
          import flash.display.BitmapData;
          import flash.filters.BlurFilter;
          import flash.filters.ColorMatrixFilter;
          import flash.geom.Point;
  
          [SWF(width=400, height=600, backgroundColor=0x000000)]
Creates a pointist painting effect using BitmapData's pixelDissolve() to introduce white pixels into an image. 

  
          public class @ax-graphic-flex-image-effects-04-Flex-PixelDissolveTest extends graphic_flex_image_effects_04_Flex_AbstractImageLoader {
Constructor. Passes path of image to load to super class. 

  
                  public function @ax-graphic-flex-image-effects-04-Flex-PixelDissolveTest() {
                          super("graphic-flex-image-effects-04-assets-fungus.jpg");
                  }
Called when image completes loading in super class. This invokes pixelDissolve() on image to introduce random white pixels. 

  
                  override protected function runPostImageLoad():void {
                          var bitmapData:BitmapData = _loadedBitmap.bitmapData;
                          // affect 1/3 of the pixels
                          var numPixels:uint = (bitmapData.width*bitmapData.height)/3;
                          bitmapData.pixelDissolve(
                                  bitmapData,
                                  bitmapData.rect,
                                  new Point(),
                                  0,
                                  numPixels,
                                  0xFFFFFFFA
                          );
                          // desaturate and blur the result
                          _loadedBitmap.filters = [getSaturationFilter(), new BlurFilter()];
                          addChild(_loadedBitmap);
                  }
Returns the ColorMatrixFilter needed to desaturate an image slightly.
returns: The ColorMatrixFilter needed to desaturate an image slightly. 

  
                  private function getSaturationFilter():ColorMatrixFilter {
                          var r:Number = 0.3;
                          var g:Number = 0.59;
                          var b:Number = 0.11;
                          // the amount to desaturate
                          var amount:Number = 2.2;
                          var inverse:Number = 1-amount;
                          var matrix:Array=[
                                  inverse*r+amount, inverse*g,        inverse*b,        0, 0,
                                  inverse*r,        inverse*g+amount, inverse*b,        0, 0,
                                  inverse*r,        inverse*g,        inverse*b+amount, 0, 0,
                                  0,                0,                0,                1, 0
                          ];
                          return new ColorMatrixFilter(matrix);
                  }
  
          }
  
  }
[] 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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