Transform.java example

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ptii-master
/* Static methods that Transform java.awt.Images

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 All rights reserved.

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 */
package ptolemy.actor.lib.image;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

//////////////////////////////////////////////////////////////////////////
//// Transform

/**
 Transform an image by either rotating or scaling it.

 <p>Some of the code in this file is based on code from
 <a href="http://java.sun.com/docs/books/tutorial/extra/fullscreen/example.html">http://java.sun.com/docs/books/tutorial/extra/fullscreen/example.html</a>.

 @author  Christopher Hylands
 @version $Id$
 @since Ptolemy II 3.0
 @Pt.ProposedRating Red (cxh)
 @Pt.AcceptedRating Red (cxh)
 */
public class Transform {
    /** Rotate an Image.
     *  @param originalImage The java.awt.Image to rotate.
     *  @param rotate The number of degrees to rotate the originalImage
     *  @return The rotated Image.
     */
    public static Image rotate(Image originalImage, int rotate) {
        int width = originalImage.getWidth(null);
        int height = originalImage.getHeight(null);
        int newWidth = width;
        int newHeight = height;

        if ((rotate == 90) || (rotate == 270)) {
            newWidth = height;
            newHeight = width;
        }

        // Create an image buffer in which to paint on.
        BufferedImage outputImage = new BufferedImage(newWidth, newHeight,
                BufferedImage.TYPE_INT_RGB);

        // Set the rotation
        AffineTransform rotateAffineTransform = new AffineTransform();

        // Convert rotate to radians.
        rotateAffineTransform.rotate(rotate * (Math.PI / 180.0F), width / 2.0,
                height / 2.0);

        if (!((rotate == 180) || (rotate == 360))) {
            rotateAffineTransform.translate((width / 2) - (height / 2),
                    (width / 2) - (height / 2));
        }

        // Paint image.
        Graphics2D graphics2d = outputImage.createGraphics();
        graphics2d.drawImage(originalImage, rotateAffineTransform, null);
        graphics2d.dispose();

        return outputImage;
    }

    /** Scale an image so that its maximum dimension is no larger than
     *  the maximumDimension parameter.
     *  This method is useful for creating thumbnail images.
     *  @param originalImage The java.awt.Image to rotate.
     *  @param maximumDimension The maximum x or y dimension
     *  @return The scaled Image.
     */
    public static Image scale(Image originalImage, int maximumDimension) {
        // Determine the scale.
        double scale = (double) maximumDimension
                / (double) originalImage.getHeight(null);

        if (originalImage.getWidth(null) > originalImage.getHeight(null)) {
            scale = (double) maximumDimension
                    / (double) originalImage.getWidth(null);
        }

        // Determine size of new image.
        // One of them should equal maximumDimension.
        int scaledWidth = (int) (scale * originalImage.getWidth(null));
        int scaledHeight = (int) (scale * originalImage.getHeight(null));

        // Create an image buffer in which to paint on.
        BufferedImage outputImage = new BufferedImage(scaledWidth,
                scaledHeight, BufferedImage.TYPE_INT_RGB);

        // Set the scale.
        AffineTransform scaleAffineTransform = new AffineTransform();

        // If the image is smaller than the desired image size,
        // don't bother scaling.
        //if (scale < 1.0d) {
        scaleAffineTransform.scale(scale, scale);

        //}
        // Paint image.
        Graphics2D graphics2d = outputImage.createGraphics();
        graphics2d.drawImage(originalImage, scaleAffineTransform, null);
        graphics2d.dispose();
        return outputImage;
    }
}