?? mypanel.java
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package drawline;import java.awt.*;import javax.swing.JPanel;import java.awt.event.*;/** * Title: * Description: * Copyright: Copyright (c) 2001 * Company: * @author * @version 1.0 */public class MyPanel extends JPanel { BorderLayout borderLayout1 = new BorderLayout(); Label label1 = new Label(); Point p = null; Panel panel1 = new Panel(); Button button1 = new Button(); Button button2 = new Button(); public MyPanel() { try { jbInit(); } catch(Exception ex) { ex.printStackTrace(); } } void jbInit() throws Exception { this.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() { public void mouseMoved(MouseEvent e) { this_mouseMoved(e); } }); this.setLayout(borderLayout1); this.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(MouseEvent e) { this_mouseClicked(e); } }); button1.setLabel("New Line"); button1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(ActionEvent e) { button1_actionPerformed(e); } }); button2.setLabel("Clear All"); button2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(ActionEvent e) { button2_actionPerformed(e); } }); this.add(label1, BorderLayout.SOUTH); this.add(panel1, BorderLayout.NORTH); panel1.add(button1, null); panel1.add(button2, null); } void this_mouseMoved(MouseEvent e) { String s = "("+String.valueOf(e.getX())+","+String.valueOf(e.getY())+")"; if (p != null) s = "Line To:" + s; label1.setText(s); } void this_mouseClicked(MouseEvent e) { Graphics g = this.getGraphics(); g.setColor(Color.red); if (p != null) g.drawLine(e.getX(),e.getY(),(int)p.getX(),(int)p.getY()); p = new Point(e.getX(),e.getY()); } void button2_actionPerformed(ActionEvent e) { Graphics g = this.getGraphics(); g.clearRect(0,0,this.getWidth(),this.getHeight()); p = null; } void button1_actionPerformed(ActionEvent e) { p = null; }}?? 快捷鍵說明
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