frame1.java

来自「是用java开发的一些程序原代码 是用java开发的一些程序原代码」· Java 代码 · 共 62 行

package ex08_11;

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

public class Frame1 extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();

  /**Construct the frame*/
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  /**Component initialization*/
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Frame Title");
    this.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseReleased(MouseEvent e) {
        this_mouseReleased(e);
      }
      public void mousePressed(MouseEvent e) {
        this_mousePressed(e);
      }

    });
  }
  /**Overridden so we can exit when window is closed*/
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
//声明画线起点的变量
Point startpoint;

  void this_mouseReleased(MouseEvent e) {
  //声明一个绘图区
Graphics mypaint;
mypaint=getGraphics();
//画线
mypaint.drawLine(startpoint.x,startpoint.y,e.getX(),e.getY());
  }

  void this_mousePressed(MouseEvent e) {
  //记录画线起点
startpoint=e.getPoint();
  }

}