frame1.java

jbuilder2005

package transformtest;

import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
public class Frame1
    extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();

  public Frame1() {
    try {
      setDefaultCloseOperation(EXIT_ON_CLOSE);
      jbInit();
    }
    catch (Exception exception) {
      exception.printStackTrace();
    }
  }

  /**
   * Component initialization.
   *
   * @throws java.lang.Exception
   */
  private void jbInit() throws Exception {
    contentPane = (JPanel) getContentPane();
    contentPane.setLayout(borderLayout1);
    setSize(new Dimension(300, 200));
    setTitle("绘制旋转图形");
  }
  public void paint(Graphics g){
    Graphics2D g2d = (Graphics2D) g;
    QuadCurve2D c = new QuadCurve2D.Double(150, 150, 100, 80, 50, 100);
                          //绘制二次曲线
    g2d.setColor(Color.blue);
    AffineTransform trans = new AffineTransform();
    for (int i = 1; i <= 5; i++) { //循环5次
        trans.rotate(20.0 * 3.1415927 / 180, 150, 150);
        //以(150,150)为轴心顺时针旋转20度
        g2d.setTransform(trans);
        g2d.draw(c);
      }
  }

}