用java编写画图程序

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1、Java屮的graphics类提供了画布，可以在graphic而画出各种形状，包括陶片，各种线条,字符串，各种图像。下面这个程序用java编写一个程序用来画图，类似于ppt中的画笔功能Romai▼五号，2426283importjavax.swing.*;importjava.awt.*;importjava.awt.event.*;publicclassdrawtestl{publicstaticvoidmain(Stringargs[]){drawd=newdraw();//d.drawline();}}classdrawextendsJFrameimplementsM

2、ouseListener,MouseMotionListener,ActionListener{Graphicsg;Colorcolor=Color.green;Colorcolorl=Color.gray;intstartx，starty，endx，endy;JPanelpl,p2;JButton[]btns=newJButton[4];Stringtitle[]={"设置前景色n，"设置背景色"，”设置W笔颜色n，"清除画布publicdraw(){super("画图”);this.show();this.setDefaultCloseOperation(JFrame.

3、EXIT_ON_CLOSE);setSize(700,600);setLayout(null);pl=newJPanel();p2=newJPanel();for(inti=0;i<4;i++){btns[i]=newJButton(title[i]);btns[i].addActionListener(this);add(btns[i]);}pl.setBorder(BorderFactory.createTitledBorder(’•设賈颜色pksetBackground(Color.white);pi.setBounds(30,10,140,240);btns[0].

4、setBounds(50,40,100,30);btns[l].setBounds(50,90,100,30);btn$[2].setBounds(50J40,100,30);btns[3].setBounds(50,190,100,30);add(pl);g=this.getGraphics();g.setClip(l80,50,500,500);addMouseListener(this);addMouseMotionListener(this);}//publicvoidpaint(Graphicsg){////重绘画布，当移动此画布或者覆盖此画布时，图像不会消失ll

5、llg.setColor(Color.white);UHg.drawStringC画图板n，20,30);//}publicvoidmouseClicked(MouseEvente){}publicvoidmouseEntered(MouseEvente){}publicvoidmouseExited(MouseEvente){}publicvoidmousePressed(MouseEvente){if(e.getButton()==MouseEvent.BUTTON1){startx=e.getX();starty=e.getY();System.out.println

6、C•鼠标左键被按下••);}elseif(e.getButton()==MouseEvent.BUTTON3){System.out.printlnC•鼠标右键被按下n);}}publicvoidmouseReleased(MouseEvente){}publicvoidmou$eDragged(Mou$eEvente){g.setColor(color);g.drawLine(startx，starty，e.getX()，e.getY());startx=e.getX();starty=e.getY();}publicvoidmouseMoved(MouseEvente)

7、{}publicvoidactionPerformed(ActionEvente){Objecto=e.getSource();if(o==btns[2]){color=JColorChooser.showDialog(null，"设置画笔颜色"，Color.white);g.setColor(color);}if(o==btns[l]){colorl=JColorChooser.showDialog(null，’•设置背景色”，Color.black);g.setColor(colorl);g.fillRect(