/*
* Rotate180
*
* Copyright (c) 2001, 2002, 2003 Marco Schmidt.
* All rights reserved.
*/
package net.sourceforge.jiu.geometry;
import net.sourceforge.jiu.data.PixelImage;
import net.sourceforge.jiu.data.IntegerImage;
import net.sourceforge.jiu.ops.ImageToImageOperation;
import net.sourceforge.jiu.ops.MissingParameterException;
import net.sourceforge.jiu.ops.WrongParameterException;
/**
* Rotates images by 180 degrees.
* The result is the same as a a {@link Flip} operation followed by a {@link Mirror} operation (or vice versa).
* Input image must implement {@link net.sourceforge.jiu.data.IntegerImage}.
* <h3>Usage example</h3>
* <pre>
* Rotate180 rotate = new Rotate180();
* rotate.setInputImage(image); // something implementing IntegerImage
* rotate.process();
* PixelImage rotatedImage = rotate.getOutputImage();
* </pre>
* @author Marco Schmidt
*/
public class Rotate180 extends ImageToImageOperation
{
private void process(IntegerImage in, IntegerImage out)
{
final int WIDTH = in.getWidth();
final int HEIGHT = in.getHeight();
if (out == null)
{
out = (IntegerImage)in.createCompatibleImage(WIDTH, HEIGHT);
setOutputImage(out);
}
int totalItems = in.getNumChannels() * HEIGHT;
int processedItems = 0;
for (int c = 0; c < in.getNumChannels(); c++)
{
for (int y1 = 0, y2 = HEIGHT - 1; y1 < HEIGHT; y1++, y2--)
{
for (int x1 = 0, x2 = WIDTH - 1; x1 < WIDTH; x1++, x2--)
{
out.putSample(c, x2, y2, in.getSample(c, x1, y1));
}
setProgress(processedItems++, totalItems);
}
}
}
public void process() throws
MissingParameterException,
WrongParameterException
{
ensureInputImageIsAvailable();
ensureImagesHaveSameResolution();
PixelImage image = getInputImage();
if (image instanceof IntegerImage)
{
process((IntegerImage)image, (IntegerImage)getOutputImage());
}
else
{
throw new WrongParameterException("Input image must implement IntegerImage.");
}
}
}