?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");
??}
}
?
posted on 2005-09-22 07:23
Pudgy's World 閱讀(456)
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