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arpit on 06/12/11

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Last Edited at 06/12/11 03:28am

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Creating a reflection effect in Android

/ Published in: Java

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private Bitmap getReflection(Bitmap bitmap) {
    Bitmap reflection = reflections.get(bitmap);
    if (reflection == null) {
        // We're cropping the height of the reflection to 80
        int reflectionH = 80;
        reflection = Bitmap.createBitmap(bitmap.getWidth(),
                reflectionH, Bitmap.Config.ARGB_8888);

Bitmap blurryBitmap = Bitmap.createBitmap(bitmap, 0,
                bitmap.getHeight() - reflectionH,
                bitmap.getWidth(), reflectionH);
        // cheap and easy scaling algorithm; down-scale it, then
        // upscale it. The filtering during the scale operations
        // will blur the resulting image
        blurryBitmap = Bitmap.createScaledBitmap(
                Bitmap.createScaledBitmap(
                        blurryBitmap,blurryBitmap.getWidth() / 2,
                        blurryBitmap.getHeight() / 2, true),
                blurryBitmap.getWidth(), blurryBitmap.getHeight(), true);
        // This shader will hold a cropped, inverted,
        // blurry version of the original image
        BitmapShader bitmapShader = new BitmapShader(blurryBitmap,
                TileMode.CLAMP, TileMode.CLAMP);
        Matrix invertMatrix = new Matrix();
        invertMatrix.setScale(1f, -1f);
        invertMatrix.preTranslate(0, -reflectionH);
        bitmapShader.setLocalMatrix(invertMatrix);

// This shader holds an alpha gradient
        Shader alphaGradient = new LinearGradient(0, 0, 0, reflectionH,
                0x80ffffff, 0x00000000, TileMode.CLAMP);

// This shader combines the previous two, resulting in a
        // blurred, fading reflection
        ComposeShader compositor = new ComposeShader(bitmapShader,
                alphaGradient, PorterDuff.Mode.DST_IN);

Paint reflectionPaint = new Paint();
        reflectionPaint.setShader(compositor);

// Draw the reflection into the bitmap that we will return
        Canvas canvas = new Canvas(reflection);
        canvas.drawRect(0, 0, reflection.getWidth(),
                reflection.getHeight(), reflectionPaint);
    }
    return reflection;

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

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