Pointcur=track.get（i）;
Pointnext=track.get（i+1）;
g.drawLine（cur.x,cur.y,next.x,next.y）;
}
}
privatevoidAddPoint（Pointp）{
track.add（p）;
}
@Override
publicvoiddoMousePress（Pointp）{
//TODOAuto-generatedmethodstub
AddPoint（p）;
}
@Override
publicvoiddoMouseDrag（Pointp）{
//TODOAuto-generatedmethodstub
AddPoint（p）;
}
@Override
publicvoiddoMouseRelease（Pointp）{
//TODOAuto-generatedmethodstub
AddPoint（p）;
}
}
Rect.java
packagebase;
importjava.awt.Graphics;
importjava.awt.Point;
publicclassRectextendsGrapicsElem{
intx,y,width,height;
@Override
publicvoiddraw（Graphicsg）{
//TODOAuto-generatedmethodstub
g.drawRect（getX（）,getY（）,getWidth（）,getHeight（））;
}
@Override
publicvoiddoMousePress（Pointp）{
super.setStart（p）;
super.setEnd（p）;
}
@Override
publicvoiddoMouseDrag（Pointp）{
super.setEnd（p）;
}
@Override
publicvoiddoMouseRelease（Pointp）{
super.setEnd（p）;
}
publicintgetX（）{
returnMath.min（start.x,end.x）;
}
publicintgetY（）{
returnMath.min（start.y,end.y）;
}
publicintgetWidth（）{
returnMath.abs（start.x-end.x）;
}
publicintgetHeight（）{
returnMath.abs（start.y-end.y）;
}
}
Circle.java
packagebase;
importjava.awt.Graphics;
publicclassCircleextendsRect{
@Override
publicvoiddraw（Graphicsg）{
//TODOAuto-generatedmethodstub
g.drawOval（getX（）,getY（）,getWidth（）,getHeight（））;
}
}
windowsPaint.java
packagewinpaint;
importjava.awt.BasicStroke;
importjava.awt.Button;
importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics;
importjava.awt.Graphics2D;
importjava.awt.Image;
importjava.awt.Point;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.awt.event.MouseEvent;
importjava.awt.event.MouseListener;
importjava.awt.event.MouseMotionListener;
importjava.io.File;
importjava.io.IOException;
importjava.nio.Buffer;
importjava.util.ArrayList;
importjava.util.BitSet;
importjava.util.List;
importjava.awt.geom.*;
importjava.awt.image.BufferedImage;
importjavax.imageio.ImageIO;
importjavax.swing.ImageIcon;
importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JLabel;
importjavax.swing.JPanel;
importjavax.swing.JToolBar;
importbase.Circle;
importbase.GrapicsElem;
importbase.Line;
importbase.Rect;
importjava.awt.BorderLayout;
publicclasswindowsPaintextendsJPanel
implementsMouseListener,MouseMotionListener
{
Stringcommand="矩形";
ListLg=newArrayList（）;
GrapicsElemcur;
JLabellabel;
publicwindowsPaint（Stringtitle）{
init（）;
}
privatevoidinit（）{
addMouseListener（this）;
addMouseMotionListener（this）;
}
/**
*可以使用反射去掉判断语句、
*Class
>g=Class.forName（"base.Rect"）;
*g.newInstance（）;
*@return
*/
privateGrapicsElemnewInstance（）{
command=WinToolBar.Command;
if（command.equals（"矩形"））{
returnnewRect（）;
}elseif（command.equals（"圆形"））{
returnnewCircle（）;
}elseif（command.equals（"线"））{
returnnewLine（）;
}
returnnull;
}
@Override
publicvoidpaint（Graphicsg）{
//TODOAuto-generatedmethodstub
super.paint（g）;
Graphics2Dg2d=（Graphics2D）g;
//g2d.setColor（cur.getColor（））;
//System.out.println（cur.getColor（））;
g2d.setStroke（newBasicStroke（10.0f））;
for（inti=0;iGrapicsElemge=Lg.get（i）;
ge.draw（g）;
}
}
//@Override
//publicvoidrepaint（）{
////TODOAuto-generatedmethodstub
////TODOAuto-generatedmethodstub
////
//super.repaint（）;
////Threadthread=newThread（newRunnable（）{
////@Override
////publicvoidrun（）{
//////TODOAuto-generatedmethodstub
////try{
////SaveToFile（）;
////}catch（IOExceptione）{
//////TODOAuto-generatedcatchblock
////e.printStackTrace（）;
////}
////}
////}）;
////thread.start（）;
////
////ImageIconbg=newImageIcon（"tmp.jpg"）;
////if（bg!
=null）{
////if（label!
=null）
////this.remove（label）;
////label=newJLabel（bg）;
////label.setBounds（0,0,bg.getIconWidth（）,bg.getIconHeight（））;
////this.add（label）;
////super.repaint（）;
////}
////
//}
privatevoidSaveToFile（）throwsIOException{
//TODOAuto-generatedmethodstub
BufferedImagebimg=newBufferedImage（this.getWidth（）,this.getHeight（）,BufferedImage.TYPE_3BYTE_BGR）;
Graphics2Dg2d=bimg.createGraphics（）;
this.paint（g2d）;
ImageIO.write（bimg,"jpg",newFile（"tmp.jpg"））;
}
@Override
publicvoidmousePressed（MouseEvente）{
Pointp=newPoint（e.getX（）,e.getY（））;
cur=newInstance（）;
cur.doMousePress（p）;
Lg.add（cur）;
}
@Override
publicvoidmouseDragged（MouseEvente）{
Pointp=newPoint（e.getX（）,e.getY（））;
cur.doMouseDrag（p）;
repaint（）;
}
@Override
publicvoidmouseReleased（MouseEvente）{
Pointp=newPoint（e.getX（）,e.getY（））;
cur.doMouseRelease（p）;
repaint（）;
}
@Override
publicvoidmouseMoved（MouseEvente）{
//TODOAuto-generatedmethodstub
}
@Override
publicvoidmouseClicked（MouseEvente）{
//TODOAuto-generatedmethodstub
}
@Override
publicvoidmouseEntered（MouseEvente）{
//TODOAuto-generatedmethodstub
}
@Override
publicvoidmouseExited（MouseEvente）{
//TODOAuto-generatedmethodstub
}
}
WinToolBar.java
packagewinpaint;
importjava.awt.Color;
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjava.awt.event.ItemEvent;
importjava.awt.event.ItemListener;
importjavax.swing.JButton;
importjavax.swing.JComboBox;
importjavax.swing.JSeparator;
importjavax.swing.JToolBar;
publicclassWinToolBarextendsJToolBarimplementsActionListener{
publicstaticStringCommand="矩形";
JButtonbtn1,btn2,btn3;
//windowsPaintwinp;
publicWinToolBar（windowsPaintwinP）{
btn1=newJButton（"矩形"）;
btn2=newJButton（"圆形"）;
btn3=newJButton（"线"）;
this.add（btn1）;
this.add（btn2）;
this.add（btn3）;
btn1.addActionListener（（ActionListener）this）;
btn2.addActionListener（（ActionListener）this）;
btn3.addActionListener（（ActionListener）this）;
//this.winp=winP;
JComboBoxcom=newJComboBox（）;
com.addItem（"红色"）;
com.addItem（"蓝色"）;
com.addItem（"黑色"）;
com.addItemListener（newItemListener（）{
@Override
publicvoiditemStateChanged（ItemEvente）{
//TODOAuto-gen
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