Flips the supplied BufferedImage vertically. - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage Rotate

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Description

Flips the supplied BufferedImage vertically.

Demo Code

/*/*from w  w  w  .  jav  a  2s .c o  m*/
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 * This software is provided "AS IS," without a warranty of any kind. ALL
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//package com.java2s;

import java.awt.image.*;

public class Main {
    /** Flips the supplied BufferedImage vertically. This is often a
        necessary conversion step to display a Java2D image correctly
        with OpenGL and vice versa. */
    public static void flipImageVertically(final BufferedImage image) {
        final WritableRaster raster = image.getRaster();
        Object scanline1 = null;
        Object scanline2 = null;

        for (int i = 0; i < image.getHeight() / 2; i++) {
            scanline1 = raster.getDataElements(0, i, image.getWidth(), 1,
                    scanline1);
            scanline2 = raster.getDataElements(0,
                    image.getHeight() - i - 1, image.getWidth(), 1,
                    scanline2);
            raster.setDataElements(0, i, image.getWidth(), 1, scanline2);
            raster.setDataElements(0, image.getHeight() - i - 1,
                    image.getWidth(), 1, scanline1);
        }
    }
}

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