topical media & game development
[] 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) _

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#graphic-flex-image-effects-02-Flex-DisplacementMapFilterTest.ax

#graphic-flex-image-effects-02-Flex-DisplacementMapFilterTest.ax [swf] [flash] flex 


  package {
  
          import flash.display.Bitmap;
          import flash.display.BitmapData;
          import flash.display.BitmapDataChannel;
          import flash.display.Shape;
          import flash.filters.BlurFilter;
          import flash.filters.DisplacementMapFilter;
          import flash.filters.DisplacementMapFilterMode;
          import flash.geom.Matrix;
          import flash.geom.Point;
  
          [SWF(width=600, height=400, backgroundColor=0xEEEEEE)]
Tests application of the DisplacementMapFilter to a loaded image. 

  
          public class @ax-graphic-flex-image-effects-02-Flex-DisplacementMapFilterTest extends graphic_flex_image_effects_02_Flex_ImageFilterTest {
Constructor. Sends image path to super method. 

  
                  public function @ax-graphic-flex-image-effects-02-Flex-DisplacementMapFilterTest() {
                          super("graphic-flex-image-effects-02-assets-checkers.jpg");
                  }
Draws a shape, then uses it to displace the loaded image. 

  
                  override protected function applyFilter():void {
                          // darws a white circle
                          var shape:Shape = new Shape();
                          shape.graphics.beginFill(0xFFFFFF);
                          var radius:Number = (Math.min(_bitmap.width, _bitmap.height) - 150)/2;
                          shape.graphics.drawCircle(radius, radius, radius);
                          shape.graphics.endFill();
  
                          // creates a BitmapData to draw the shape into
                          var map:BitmapData = new BitmapData(_bitmap.width, _bitmap.height, false, 0xFF000000);
                          var matrix:Matrix = new Matrix();
                          // matrix is used to draw shape into middle of bitmap
                          matrix.translate((_bitmap.width - radius*2)/2, (_bitmap.height - radius*2)/2);
                          map.draw(shape, matrix);
                          // blur is applied to create more levels of gray
                          var blurFilter:BlurFilter = new BlurFilter(80, 80);
                          map.applyFilter(map, map.rect, new Point(), blurFilter);
                          // map is positioned and added to stage
                          var mapBitmap:Bitmap = new Bitmap(map);
                          mapBitmap.y = _bitmap.y;
                          _bitmap.x = mapBitmap.width;
                          addChild(mapBitmap);
  
                          // displacement of image using the drawn map
                          var filter:DisplacementMapFilter = new DisplacementMapFilter();
                          filter.mapBitmap = map;
                          filter.componentX = BitmapDataChannel.RED;
                          filter.componentY = BitmapDataChannel.RED;
                          filter.scaleX = 30;
                          filter.scaleY = 30;
                          // pixels outside range won't wrap; instead, pixels will be repeated
                          filter.mode = DisplacementMapFilterMode.CLAMP;
                          _bitmap.filters = [filter];
                  }
  
          }
  
  }
[] 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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