- public static Bitmap createReflectedImage(Bitmap originalImage) {
- // The gap we want between the reflection and the original image
- final int reflectionGap = 4;
- int width = originalImage.getWidth();
- int height = originalImage.getHeight();
- // This will not scale but will flip on the Y axis
- Matrix matrix = new Matrix();
- matrix.preScale(1, -1);
- // Create a Bitmap with the flip matrix applied to it.
- // We only want the bottom half of the image
- Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height / 2, width,
- height / 2, matrix, false);
- // Create a new bitmap with same width but taller to fit reflection
- Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2),
- Config.ARGB_8888);
- // Create a new Canvas with the bitmap that's big enough for
- // the image plus gap plus reflection
- Canvas canvas = new Canvas(bitmapWithReflection);
- // Draw in the original image
- canvas.drawBitmap(originalImage, 0, 0, null);
- // Draw in the gap
- Paint defaultPaint = new Paint();
- canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);
- // Draw in the reflection
- canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
- // Create a shader that is a linear gradient that covers the reflection
- Paint paint = new Paint();
- LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0,
- bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff,
- TileMode.CLAMP);
- // Set the paint to use this shader (linear gradient)
- paint.setShader(shader);
- // Set the Transfer mode to be porter duff and destination in
- paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
- // Draw a rectangle using the paint with our linear gradient
- canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);
- return bitmapWithReflection;
-
}
From: http://www.linuxidc.com/Linux/2011-10/44928.htm