Android Bitmap Reflect toReflectionBitmap(Bitmap bitmap)

Description

to Reflection Bitmap

License

Apache License

Declaration

public static Bitmap toReflectionBitmap(Bitmap bitmap) 

Method Source Code

//package com.java2s;
/*//from w w  w . j av  a2s  . c  om
 * Copyright (C) 2013 www.418log.org
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;

import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;

import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;

import android.graphics.Shader.TileMode;

public class Main {

    public static Bitmap toReflectionBitmap(Bitmap bitmap) {
        if (bitmap == null) {
            return null;
        }

        try {
            int reflectionGap = 1;
            int width = bitmap.getWidth();
            int height = bitmap.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(bitmap, 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(bitmap, 0, 0, null);
            // Draw in the gap
            Paint deafaultPaint = new Paint();
            canvas.drawRect(0, height, width, height + reflectionGap,
                    deafaultPaint);
            // 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,
                    bitmap.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);

            bitmap = bitmapWithReflection;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bitmap;
    }
}

Related

1. createReflectionImageWithOrigin(Bitmap bitmap)
2. createReflectionImageWithOrigin(Bitmap bitmap)
3. toReflectionBitmap(Bitmap bitmap)
4. createReflectionImageWithOrigin(Bitmap bitmap)