Advanced Search

Creating a reflection effect in Android

/ Published in: Java
Save to your folder(s)

Expand | Embed | Plain Text

Copy this code and paste it in your HTML 
  1. private Bitmap getReflection(Bitmap bitmap) {
  2.     Bitmap reflection = reflections.get(bitmap);
  3.     if (reflection == null) {
  4.         // We're cropping the height of the reflection to 80
  5.         int reflectionH = 80;
  6.         reflection = Bitmap.createBitmap(bitmap.getWidth(),
  7.                 reflectionH, Bitmap.Config.ARGB_8888);
  8.  
  9.         Bitmap blurryBitmap = Bitmap.createBitmap(bitmap, 0,
  10.                 bitmap.getHeight() - reflectionH,
  11.                 bitmap.getWidth(), reflectionH);
  12.         // cheap and easy scaling algorithm; down-scale it, then
  13.         // upscale it. The filtering during the scale operations
  14.         // will blur the resulting image
  15.         blurryBitmap = Bitmap.createScaledBitmap(
  16.                 Bitmap.createScaledBitmap(
  17.                         blurryBitmap,blurryBitmap.getWidth() / 2,
  18.                         blurryBitmap.getHeight() / 2, true),
  19.                 blurryBitmap.getWidth(), blurryBitmap.getHeight(), true);
  20.         // This shader will hold a cropped, inverted,
  21.         // blurry version of the original image
  22.         BitmapShader bitmapShader = new BitmapShader(blurryBitmap,
  23.                 TileMode.CLAMP, TileMode.CLAMP);
  24.         Matrix invertMatrix = new Matrix();
  25.         invertMatrix.setScale(1f, -1f);
  26.         invertMatrix.preTranslate(0, -reflectionH);
  27.         bitmapShader.setLocalMatrix(invertMatrix);
  28.  
  29.         // This shader holds an alpha gradient
  30.         Shader alphaGradient = new LinearGradient(0, 0, 0, reflectionH,
  31.                 0x80ffffff, 0x00000000, TileMode.CLAMP);
  32.  
  33.         // This shader combines the previous two, resulting in a
  34.         // blurred, fading reflection
  35.         ComposeShader compositor = new ComposeShader(bitmapShader,
  36.                 alphaGradient, PorterDuff.Mode.DST_IN);
  37.  
  38.         Paint reflectionPaint = new Paint();
  39.         reflectionPaint.setShader(compositor);
  40.  
  41.         // Draw the reflection into the bitmap that we will return
  42.         Canvas canvas = new Canvas(reflection);
  43.         canvas.drawRect(0, 0, reflection.getWidth(),
  44.                 reflection.getHeight(), reflectionPaint);
  45.     }
  46.     return reflection;

URL: http://graphics-geek.blogspot.com/2011/01/video-reflections-on-android.html

Report this snippet


Comments

RSS Icon Subscribe to comments

You need to login to post a comment.