mypanel.java~34~

很好得jbuilder100例源代码

package usefont;

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);
    GraphicsEnvironment env =
      GraphicsEnvironment.getLocalGraphicsEnvironment();
    String[] fonts = env.getAvailableFontFamilyNames();
    int num = 8;
    if (num>fonts.length/8)   num = (int)fonts.length/8;
    for(int i=0;i<num;i++){
      g2d.setFont(new Font(fonts[i*8], Font.PLAIN, 50));
      g2d.setPaint(Color.blue);
      g2d.drawString("Java 2D", 40, i*60);
    }
  }

  protected void clear(Graphics g) {
    super.paintComponent(g);
  }
}