frame1.java

jbuilder2005

package arctest;

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

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("绘制弧形");
  }
  public void paint(Graphics g){
        g.drawArc(20, 50, 150, 100,0,270);     //画空心圆弧
        //从0度开始逆时针旋转270度；即从3点开始，反着时针转动方向旋转3/4周
        g.fillArc(180, 50, 100, 100,90,-180); //画实心圆弧
        //从90度开始顺时针旋转180度；即从0点开始，顺着时针转动方向旋转1/2周
    }
}