Java Graphics How to - Rotate BufferedImage(Image)

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Question

We would like to know how to rotate BufferedImage(Image).

Answer

import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
/*from  w  w w .  j a  v a2 s .  c  o m*/
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedImage original = ImageIO.read(new URL(
        "http://www.java2s.com/style/download.png"));

    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    GraphicsConfiguration gc = gd.getDefaultConfiguration();

    BufferedImage rotated1 = create(original, -Math.PI / 2, gc);
    BufferedImage rotated2 = create(original, +Math.PI / 4, gc);
    BufferedImage rotated3 = create(original, Math.PI, gc);

    JPanel cp = new JPanel();
    cp.add(new JLabel(new ImageIcon(original)));
    cp.add(new JLabel(new ImageIcon(rotated1)));
    cp.add(new JLabel(new ImageIcon(rotated2)));
    cp.add(new JLabel(new ImageIcon(rotated3)));

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setContentPane(cp);
    f.pack();
    f.setVisible(true);

  }

  public static BufferedImage create(BufferedImage image, double angle,
      GraphicsConfiguration gc) {
    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);
    int transparency = image.getColorModel().getTransparency();
    BufferedImage result = gc.createCompatibleImage(neww, newh, transparency);
    Graphics2D g = result.createGraphics();
    g.translate((neww - w) / 2, (newh - h) / 2);
    g.rotate(angle, w / 2, h / 2);
    g.drawRenderedImage(image, null);
    return result;
  }
}

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