Rotate an image in java

by

You need to be using trigonometry to determine the correct width/height, using transparency to prevent the black area, and I think the Transform is wrong, which is making it off center.

Try this:

public static BufferedImage rotate(BufferedImage image, double angle) {
    double sin = Math.abs(Math.sin(angle)), cos = Math.abs(Math.cos(angle));
    int w = image.getWidth(), h = image.getHeight();
    int neww = (int)Math.floor(w*cos+h*sin), newh = (int) Math.floor(h * cos + w * sin);
    GraphicsConfiguration gc = getDefaultConfiguration();
    BufferedImage result = gc.createCompatibleImage(neww, newh, Transparency.TRANSLUCENT);
    Graphics2D g = result.createGraphics();
    g.translate((neww - w) / 2, (newh - h) / 2);
    g.rotate(angle, w / 2, h / 2);
    g.drawRenderedImage(image, null);
    g.dispose();
    return result;
}

private static GraphicsConfiguration getDefaultConfiguration() {
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    return gd.getDefaultConfiguration();
}

from http://flyingdogz.wordpress.com/2008/02/11/image-rotate-in-java-2-easier-to-use/

More Related Contents:

  1. JComponents not showing up with picture background?
  2. How to scale a BufferedImage
  3. rotating coordinate plane for data and text in Java
  4. Moving objects and timers
  5. How to setSize of image using RescaleOp
  6. Rotating Image with AffineTransform
  7. Rotating BufferedImage instances
  8. How to draw an image over another image?
  9. Rotate BufferedImage Inside JPanel
  10. Java – resize image without losing quality
  11. Exporting a JPanel to an image
  12. Drawing a Component to BufferedImage causes display corruption
  13. How do I draw an image to a JPanel or JFrame?
  14. Understanding BufferedImage.getRGB output values
  15. Graphics Context misaligned on first paint
  16. The Use of Multiple JFrames: Good or Bad Practice? [closed]
  17. Fast Bitmap Blur For Android SDK
  18. Nice looking progress bar in java
  19. JTable disable Checkbox in Cell
  20. Java Wait for thread to finish
  21. Is it safe to construct Swing/AWT widgets NOT on the Event Dispatch Thread?
  22. How do I get which JRadioButton is selected from a ButtonGroup
  23. How to provide pagination support to a JTable in Swing?
  24. How to save a BufferedImage as a File
  25. Rotate JLabel or ImageIcon on Java Swing
  26. Make JScrollPane control multiple components
  27. How do I resize images inside an application when the application window is resized?
  28. SwingWorker ProgressBar
  29. How to check that a JCheckBox is checked?
  30. Basic Java Swing, how to exit and dispose of your application/JFrame

Leave a Comment