/*

*只畫直線，矩形，橢圓，只能向右下角畫

*

*PainterPanel extends JPanel implements MouseListener

*addMouseListener(this);

*

*JToggleButton

*

*hxz*/

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

class PainterPanel extends JPanel implements MouseListener{

int shape=-1; //圖案類型

Point[] point=new Point[2]; //記錄鼠標拖動的起始點和終點

public PainterPanel(){

super(); //調用父類構造函數

this.setBackground(Color.white); //設置背景顏色

point[0]=new Point(-1,-1); //初始化變量

point[1]=new Point(-1,-1);

addMouseListener(this); //增加鼠標事件

}

public void mouseReleased(MouseEvent e){ //鼠標釋放事件

point[1]=new Point(e.getX(),e.getY()); //設置終點位置

repaint(); //重繪屏幕

}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void mousePressed(MouseEvent e){ //鼠標按下時事件

point[0]=new Point(e.getX(),e.getY()); //設置起始點位置

}

public void paint(Graphics g){

super.paint(g);

switch (shape){ //根據shape值繪制圖形

case 0:

g.drawLine(point[0].x,point[0].y,point[1].x,point[1].y); //繪線

break;

case 1:

int width=point[1].x-point[0].x;

int height=point[1].y-point[0].y;

g.drawOval(point[0].x,point[0].y,width,height); //繪橢圓

break;

case 2:

width=point[1].x-point[0].x;

height=point[1].y-point[0].y;

g.drawRect(point[0].x,point[0].y,width,height); //繪矩形

break;

}

}

public void drawShape(int shape){

this.shape=shape;

}

}

/*

*JToggleButton

*

*JToolBar

*

*hxz*/

public class PainterDemo extends JFrame{

JToggleButton[] button=new JToggleButton[3]; //按鈕組

PainterPanel painter=new PainterPanel(); //繪圖面板

public PainterDemo(){

super("Java畫圖程序"); //調用父類構造函數

String[] buttonName={"直線","橢圓","矩形"}; //按鈕文字

DrawShapeListener buttonListener=new DrawShapeListener(); //按鈕事件

JToolBar toolBar=new JToolBar(); //實例化工具欄

ButtonGroup buttonGroup=new ButtonGroup(); //實例化按鈕組

for (int i=0;i

button[i]=new JToggleButton(buttonName[i]); //實例化按鈕

button[i].addActionListener(buttonListener); //增加按鈕事件處理

buttonGroup.add(button[i]); //增加按鈕到按鈕組

toolBar.add(button[i]); //增加按鈕到工具欄

}

Container container=getContentPane(); //得到窗口容器

container.add(toolBar,BorderLayout.NORTH); //增加組件到容器上

container.add(painter,BorderLayout.CENTER);

setSize(300,200); //設置窗口尺寸

setVisible(true); //設置窗口為可視

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //關閉窗口時退出程序

}

//內部類

class DrawShapeListener implements ActionListener{ //按鈕事件處理

public void actionPerformed(ActionEvent e){

for (int i=0;i

if (e.getSource()==button[i]){ //判斷來自于哪個按鈕

painter.drawShape(i); //繪制圖形

}

}

}

}

public static void main(String[] args){

new PainterDemo();

}

}

總結

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