Rotate Image 45 Degrees
/*
Java Media APIs: Cross-Platform Imaging, Media and Visualization
Alejandro Terrazas
Sams, Published November 2002,
ISBN 0672320940
*/
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Insets;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import javax.swing.JFrame;
/**
* RotateImage45Degrees.java - 1. scales an image's dimensions by a factor of
* two 2. rotates it 45 degrees around the image center 3. displays the
* processed image
*/
public class RotateImage45Degrees extends JFrame {
private Image inputImage;
private BufferedImage sourceBI;
private BufferedImage destinationBI = null;
private Insets frameInsets;
private boolean sizeSet = false;
public RotateImage45Degrees(String imageFile) {
addNotify();
frameInsets = getInsets();
inputImage = Toolkit.getDefaultToolkit().getImage(imageFile);
MediaTracker mt = new MediaTracker(this);
mt.addImage(inputImage, 0);
try {
mt.waitForID(0);
} catch (InterruptedException ie) {
}
sourceBI = new BufferedImage(inputImage.getWidth(null), inputImage
.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D g = (Graphics2D) sourceBI.getGraphics();
g.drawImage(inputImage, 0, 0, null);
AffineTransform at = new AffineTransform();
// scale image
at.scale(2.0, 2.0);
// rotate 45 degrees around image center
at.rotate(45.0 * Math.PI / 180.0, sourceBI.getWidth() / 2.0, sourceBI
.getHeight() / 2.0);
/*
* translate to make sure the rotation doesn't cut off any image data
*/
AffineTransform translationTransform;
translationTransform = findTranslation(at, sourceBI);
at.preConcatenate(translationTransform);
// instantiate and apply affine transformation filter
BufferedImageOp bio;
bio = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
destinationBI = bio.filter(sourceBI, null);
int frameInsetsHorizontal = frameInsets.right + frameInsets.left;
int frameInsetsVertical = frameInsets.top + frameInsets.bottom;
setSize(destinationBI.getWidth() + frameInsetsHorizontal, destinationBI
.getHeight()
+ frameInsetsVertical);
show();
}
/*
* find proper translations to keep rotated image correctly displayed
*/
private AffineTransform findTranslation(AffineTransform at, BufferedImage bi) {
Point2D p2din, p2dout;
p2din = new Point2D.Double(0.0, 0.0);
p2dout = at.transform(p2din, null);
double ytrans = p2dout.getY();
p2din = new Point2D.Double(0, bi.getHeight());
p2dout = at.transform(p2din, null);
double xtrans = p2dout.getX();
AffineTransform tat = new AffineTransform();
tat.translate(-xtrans, -ytrans);
return tat;
}
public void paint(Graphics g) {
if (destinationBI != null)
g.drawImage(destinationBI, frameInsets.left, frameInsets.top, this);
}
public static void main(String[] args) {
new RotateImage45Degrees("fruits.png");
}
}
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