mypanel.java~4~

Jbuilder100个例子 都是经典例子 对大家学习Jbuilder非常有帮助

package coordinate;

import java.awt.*;
import javax.swing.JPanel;
import java.awt.geom.*;

/**
 * Title:
 * Description:
 * Copyright:    Copyright (c) 2001
 * Company:
 * @author
 * @version 1.0
 */

public class MyPanel extends JPanel {
  BorderLayout borderLayout1 = new BorderLayout();
  private Ellipse2D.Double circle =
    new Ellipse2D.Double(10, 10, 350, 350);
  private GradientPaint gradient =
    new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,true);

  public MyPanel() {
    try {
      jbInit();
    }
    catch(Exception ex) {
      ex.printStackTrace();
    }
  }
  void jbInit() throws Exception {
    this.setLayout(borderLayout1);
  }

  public void paintComponent(Graphics g) {
    clear(g);
    Graphics2D g2d = (Graphics2D)g;
    g2d.setPaint(gradient);
    g2d.fill(circle);
    g2d.setColor(Color.blue);
    g2d.draw(circle);
    g2d.translate(180.0 , 180.0);
    for (int i=0; i<1; i++) {
      // Rotate the coordinate system around current
      // origin, which is at the center of the circle.
      g2d.rotate(16*Math.PI/16.0);
      g2d.setFont(new Font("TimesRoman",Font.PLAIN,100-i*2));
      if (i%2 == 0)
        g2d.setPaint(Color.black);
      else
        g2d.setPaint(Color.white);
      g2d.drawString("Java", 0, 0);
    }
  }
  protected void clear(Graphics g) {
    super.paintComponent(g);
  }
}