Package net.sourceforge.jiu.geometry

Source Code of net.sourceforge.jiu.geometry.Rotate180

/*
* 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.");
    }
  }
}
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