JAVA 鼠标画直线举行椭圆

package GUIMouse;

//MouseDraw 
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;

public class GUIMouse {
	private static JMenuBar jMenuBar1;

	public static void main(String[] args) {
		MouseFrame frame = new MouseFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		{
			jMenuBar1 = new JMenuBar();
			setJMenuBar(jMenuBar1);
		}
		frame.show();
		pack();
	}

	private static void pack() {
		// TODO Auto-generated method stub

	}

	private static void setJMenuBar(JMenuBar menuBar1) {
		// TODO Auto-generated method stub

	}
}

class MouseFrame extends JFrame {
	private Button bt;
	private Button bt1;
	private Button bt2;
	private Button bt3;

	public MouseFrame() {
		setTitle("利用鼠标画图");
		setSize(WIDTH, HEIGHT);
		// 将panel加入到frame
		BorderLayout bl = new BorderLayout();
		setLayout(bl);
		bt = new Button("Auto");
		bt1 = new Button("Line");
		bt2 = new Button("Qval");
		bt3 = new Button("Rect");
		MousePanel panel = new MousePanel();
		Container contentPane = getContentPane();
		contentPane.add(bt, BorderLayout.NORTH);
		contentPane.add(bt1, BorderLayout.EAST);
		contentPane.add(bt2, BorderLayout.SOUTH);
		contentPane.add(bt3, BorderLayout.WEST);
		contentPane.add(panel, BorderLayout.CENTER);
		bt.addActionListener(new SB());
		bt1.addActionListener(new SB());
		bt2.addActionListener(new SB());
		bt3.addActionListener(new SB());
	}

	private class SB implements ActionListener {

		public void actionPerformed(ActionEvent arg0) {
			// TODO Auto-generated method stub
			if (arg0.getSource() == bt) {
				MousePanel.setControl(1);
			}
			if (arg0.getSource() == bt1) {
				MousePanel.setControl(2);
			}
			if (arg0.getSource() == bt2) {
				MousePanel.setControl(4);
			}
			if (arg0.getSource() == bt3) {
				MousePanel.setControl(3);
			}
		}

	}

	public static final int WIDTH = 300;

	public static final int HEIGHT = 200;
}

class MousePanel extends JPanel {
	private Point pt;

	private Point old_Pt;

	private static int Control = 4;

	public MousePanel() {

		// 注册监听器
		addMouseListener(new MouseHandler());
		addMouseMotionListener(new MouseMotionHandler());
	}
	
	public static void setControl(int para){
		Control = para;
	}

	public void paintComponent(Graphics g) {
		if (Control == 1 || Control == 2)
			g.drawLine(pt.x, pt.y, old_Pt.x, old_Pt.y);
		if (Control == 3)
			g.drawRect(pt.x, pt.y, old_Pt.x - pt.x, old_Pt.y - pt.y);
		if (Control == 4)
			g.drawOval(pt.x, pt.y, old_Pt.x - pt.x, old_Pt.y - pt.y);
	}

	private class MouseHandler extends MouseAdapter {
		public void mousePressed(MouseEvent event) {
			if (Control > 1) {
				pt = event.getPoint();
			}
			if (Control == 1) {
				pt = event.getPoint();
				old_Pt = pt;
			}
		}

		public void mouseReleased(MouseEvent event) {
			// 得到鼠标光标的当前位置
			if (Control > 1) {
				old_Pt = event.getPoint();
				repaint();
			}
		}
	}

	private class MouseMotionHandler implements MouseMotionListener {
		public void mouseMoved(MouseEvent event) {
			// 得到鼠标光标的当前位置
		}

		public void mouseDragged(MouseEvent event) {
			// 得到鼠标光标的当前位置
			if (Control == 1) {
				old_Pt = pt;
				pt = event.getPoint();
				repaint();
			}
		}
	}
}

评论

1 楼 haizhiguang 2012-06-22  

我按照你的代码自己写了一个试试，没看出我的代码跟你的有什么区别来，但是我的点击完鼠标之后怎么总是显示多个按钮，好像把按钮也在JPenal里面重绘了，有时间帮我看看吧，我很想使用这段代码谢谢！！！！



import java.awt.*;
import java.awt.event.*;

import javax.swing.*;


public class DrawPad {
private static JMenuBar jMenuBar1; 
 
    public static void main(String[] args) { 
        DrawArea frame = new DrawArea(); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        { 
            jMenuBar1 = new JMenuBar(); 
            frame.setJMenuBar(jMenuBar1); 
        }
        frame.show(); 
        
    } 
}


class DrawArea extends JFrame {

/**
* @param args
*/

public  JButton yuan ;
public  JButton tuoyuan ;
public  JButton juxing;
public  JButton zhengfang ;
public  JToolBar jtoolbar ;
public  JButton choseColor;




public DrawArea(){
this.setSize(this.width, this.height);
BorderLayout bl = new BorderLayout(); 
        setLayout(bl); 
DrawPanel drawpanel=new DrawPanel();

Container cc =getContentPane();
yuan =new JButton("圆");
tuoyuan =new JButton("椭圆");
juxing =new JButton("矩形");
zhengfang =new JButton("正方形");
choseColor = new JButton("选择颜色");
   
cc.add(yuan,BorderLayout.NORTH);
cc.add(tuoyuan,BorderLayout.SOUTH);
cc.add(zhengfang,BorderLayout.WEST);
cc.add(juxing,BorderLayout.EAST);

cc.add(drawpanel,BorderLayout.CENTER);

init();
}

public void init(){

this.yuan.addActionListener(new ButtonHandler());
this.tuoyuan.addActionListener(new ButtonHandler());
this.juxing.addActionListener(new ButtonHandler());
this.zhengfang.addActionListener(new ButtonHandler());
this.choseColor.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent event){
choseColor();
}
});
}
public void choseColor(){

}
private class ButtonHandler implements ActionListener{

public void actionPerformed(ActionEvent args){
if(args.getSource()== yuan){
DrawPanel.setcontrol(1);
}
if(args.getSource()==tuoyuan){
DrawPanel.setcontrol(2);
}
if(args.getSource()== juxing){
DrawPanel.setcontrol(3);
}
if(args.getSource()== zhengfang){
DrawPanel.setcontrol(4);
}

}
}

private static final int width=300;
private static final int  height =200;
}



class DrawPanel extends JPanel{

int index=0;
static int control=0;
int x,x1,y,y1;


public DrawPanel(){
//this.setBackground(Color.white);
addMouseListener(new MouseHandler());
addMouseMotionListener(new MouseMotionListeners());
}

public static void setcontrol(int par)
{
control=par;
}
public void paintComponent(Graphics g){
if (control == 1 || control == 2)
{
g.setColor(new Color(200,34,54));
     g.drawOval(x, y, x1-x, x1-x);
}
     if(control == 2){
    g.drawOval(x, y, x1-x, y1-y);
     }
     if (control == 3) 
      g.drawRect(x, y, x1-x, y1-y); //矩形
        if (control == 4) 
            g.drawOval(x, y, x1-x, x1-x); //正方形
}
private class MouseHandler extends MouseAdapter{
public void mousePressed(MouseEvent e)
{
x= e.getX();
y= e.getY();
}

public void mouseReleased(MouseEvent e){
if(control>1){
x1=e.getX();
y1=e.getY();

}
repaint();

}

}
private class MouseMotionListeners implements MouseMotionListener {

public void mouseMoved(MouseEvent e)
{

}
public void mouseDragged(MouseEvent e){
//repaint();
}
}
}