Javaサンプル(回転したイメージ表示)

//Sample19
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;
import javax.swing.JFrame;
public class Sample19 extends JFrame {
  private static final String window_title = "回転したイメージ表示";
  private static final int window_width = 640;
  private static final int window_height = 400;
  private static final String icon_filename = "ICO_020.gif";
  private static final long serialVersionUID = 1L;
  Image img;
  // 主処理
  public static void main(final String ar[]) {
    final JFrame f = new Sample19();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setSize(Sample19.window_width, Sample19.window_height);
    f.setVisible(true);
  }
  // 部品セット
  Sample19() {
    super(Sample19.window_title);
    this.img = this.getToolkit().getImage(Sample19.icon_filename);
  }
  // 描画
  @Override
  public void update(final Graphics g) {
    this.paint(g);
  }
  @Override
  public void paint(final Graphics g) {
    final Graphics2D g2 = (Graphics2D) g;
    final int image_width = this.img.getWidth(this);
    g.drawImage(this.img, 50 - image_width / 2, 150 - image_width / 2, this);
    final AffineTransform at = new AffineTransform();
    at.rotate(90 * Math.PI / 180.0, 100, 150);
    g2.setTransform(at);
    g.drawImage(this.img, 100 - image_width / 2, 150 - image_width / 2, this);
    at.rotate(90 * Math.PI / 180.0, 150, 100);
    g2.setTransform(at);
    g.drawImage(this.img, 150 - image_width / 2, 150 - image_width / 2, this);
    at.rotate(90 * Math.PI / 180.0, 150, 100);
    g2.setTransform(at);
    g.drawImage(this.img, 200 - image_width / 2, 150 - image_width / 2, this);
  }
}