java 实现画图板

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.io.*;import java.util.ArrayList;
import javax.swing.*;class Dshape implements Serializable{private static final long serialVersionUID = 1L;Shape s;Color c;boolean f;//填充状态String m=new String();//绘画模式private void writeObject(java.io.ObjectOutputStream out) throws IOException{out.defaultWriteObject();}private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException{in.defaultReadObject();}
}
class Dstr implements Serializable{private static final long serialVersionUID = 1L;String s;Font f;Color c;int x,y;//坐标private void writeObject(java.io.ObjectOutputStream out) throws IOException{out.defaultWriteObject();}private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException{in.defaultReadObject();}
}
class DArray implements Serializable{private static final long serialVersionUID = 1L;ArrayList<Dshape> shapelist=new ArrayList<Dshape>();ArrayList<Dstr> strlist=new ArrayList<Dstr>();Color backColor;//背景色private void writeObject(java.io.ObjectOutputStream out) throws IOException{out.defaultWriteObject();}private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException{in.defaultReadObject();}
}class MA extends MouseAdapter{DrawPanel dp;MA(DrawPanel dp){super();this.dp=dp;}@Overridepublic void mousePressed(MouseEvent e){//鼠标按下if(dp.tempshape!=null) {dp.da.shapelist.add(dp.tempshape);}switch(dp.model)//据绘制模式对“当前绘制图形（tempshape）”进行初始化{case "圆":{dp.tempshape=new Dshape();Ellipse2D ep1=new Ellipse2D.Double();ep1.setFrame(e.getX(), e.getY(), 0, 0);dp.tempshape.c=dp.currColor;dp.tempshape.s=ep1;dp.tempshape.f=dp.fill;dp.tempshape.m="Ellipse";break;}case "直线":{dp.tempshape=new Dshape();Line2D l=new Line2D.Double();l.setLine(e.getX(), e.getY(), e.getX(), e.getY());dp.tempshape.c=dp.currColor;dp.tempshape.s=l;dp.tempshape.f=dp.fill;dp.tempshape.m="Line";break;}case "椭圆":{dp.tempshape=new Dshape();//Arc2D ep = new Arc2D.Double();Ellipse2D ep=new Ellipse2D.Double();ep.setFrame(e.getX(), e.getY(), 0, 0);dp.tempshape.c=dp.currColor;dp.tempshape.s=ep;dp.tempshape.f=dp.fill;dp.tempshape.m="Ellipse";break;}case "矩形":{dp.tempshape=new Dshape();Rectangle2D ra=new Rectangle2D.Double();ra.setFrame(e.getX(), e.getY(), 0, 0);dp.tempshape.c=dp.currColor;dp.tempshape.s=ra;dp.tempshape.f=dp.fill;dp.tempshape.m="Rectangle";break;}}}@Overridepublic void mouseReleased(MouseEvent e){//鼠标松开switch(dp.model)//完成tempshape的绘制{case "圆":{Ellipse2D ep1=(Ellipse2D)(dp.tempshape.s);ep1.setFrame(ep1.getX(), ep1.getY(), e.getX()-ep1.getX(), e.getX()-ep1.getX());dp.repaint();break;}case "直线":{Line2D l=(Line2D)(dp.tempshape.s);l.setLine(l.getX1(), l.getY1(), e.getX(), e.getY());dp.repaint();break;}case "椭圆":{Ellipse2D ep=(Ellipse2D)(dp.tempshape.s);ep.setFrame(ep.getX(), ep.getY(), e.getX()-ep.getX(), e.getY()-ep.getY());dp.repaint();break;}case "矩形":{Rectangle2D ra=(Rectangle2D)(dp.tempshape.s);ra.setFrame(ra.getX(), ra.getY(), e.getX()-ra.getX(), e.getY()-ra.getY());dp.repaint();break;}}}@Overridepublic void mouseClicked(MouseEvent e){//鼠标点击//插入文本if(e.getButton()==MouseEvent.BUTTON3){String inputValue = JOptionPane.showInputDialog("Please input text"); Font f=new Font("宋体",20,20);Dstr ms=new Dstr();ms.s=inputValue;ms.c=dp.currColor;ms.f=f;ms.x=e.getX();ms.y=e.getY();dp.da.strlist.add(ms);dp.repaint();}}
}
class MMA extends MouseMotionAdapter{private static final long serialVersionUID = 1L;DrawPanel dp;MMA(DrawPanel dp){super();this.dp=dp;}@Overridepublic void mouseDragged(MouseEvent e) {//鼠标拖动//仅自由绘画模式触发if(dp.model.equals("Draw")){if(dp.tempshape!=null) {Line2D l=(Line2D)(dp.tempshape.s);l.setLine(l.getX1(), l.getY1(), e.getX(), e.getY());dp.da.shapelist.add(dp.tempshape);}dp.tempshape=new Dshape();Line2D l=new Line2D.Double();l.setLine(e.getX(), e.getY(), e.getX(), e.getY());dp.tempshape.c=dp.currColor;dp.tempshape.s=l;dp.repaint();}}
}class DrawPanel extends JPanel{DArray da= new DArray();Dshape tempshape;Color currColor;boolean fill=false;String model=new String();public DrawPanel(){super();MA ma=new MA(this);this.addMouseListener(ma);MMA mma=new MMA(this);this.addMouseMotionListener(mma);//设置监听器}@Overridepublic void paintComponent(Graphics g) {super.paintComponent(g);Graphics2D g2d=(Graphics2D) g;for(Dshape ms:da.shapelist) {g2d.setColor(ms.c);if(ms.f&&!ms.m.equals("Line"))g2d.fill(ms.s);elseg2d.draw(ms.s);}//绘制已记录的图形for(Dstr ms:da.strlist) {g2d.setColor(ms.c);g2d.setFont(ms.f);g2d.drawString(ms.s,ms.x,ms.y);}//插入已记录的文本if(tempshape!=null) {g2d.setColor(tempshape.c);if(tempshape.f&&!tempshape.m.equals("Line"))g2d.fill(tempshape.s);elseg2d.draw(tempshape.s);}//记录当前绘制的图形（若非null）}}class MTLis implements ActionListener{DrawBoard bo;MTLis(DrawBoard bo){super();this.bo=bo;}@Overridepublic void actionPerformed(ActionEvent ae) {// TODO Auto-generated method stubif(ae.getSource().getClass()==JButton.class){JButton mid=(JButton)ae.getSource();if(mid.getText().equals("打开")){JFileChooser jf=new JFileChooser();jf.showOpenDialog(bo);  String s=jf.getSelectedFile().toString();File f=new File(s);try {read(f);} catch (ClassNotFoundException | IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}bo.dpl.repaint();bo.dpl.setBackground(bo.dpl.da.backColor);bo.message.append("File open "+s+"\n");}//加载文件并将其绘制出来，同时设置背景色if(mid.getText().equals("保存")){if(bo.dpl.tempshape!=null)bo.dpl.da.shapelist.add(bo.dpl.tempshape);JFileChooser jf=new JFileChooser();int n=jf.showSaveDialog(bo);String s=jf.getSelectedFile().toString();File f=new File(s);try {write(f);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}bo.message.append("File save "+s+"\n");}//记录当前绘制图形，序列化保存if(mid.getText().equals("红色")) {JColorChooser jc=new JColorChooser();               Color c=new Color(255,0,0);bo.dpl.currColor=c;}//更改前端颜色if(mid.getText().equals("黑色")){JColorChooser jc=new JColorChooser();                Color c=new Color(0,0,0);bo.dpl.currColor=c;}//更改填充状态if(mid.getText().equals("蓝色")) {JColorChooser jc=new JColorChooser();             Color c=new Color(0,0,255);bo.dpl.currColor=c;    }//更改背景色if(mid.getText().equals("圆")){bo.dpl.model="圆";}if(mid.getText().equals("直线")){bo.dpl.model="直线";}if(mid.getText().equals("椭圆")){bo.dpl.model="椭圆";}if(mid.getText().equals("矩形")){bo.dpl.model="矩形";}//更改绘画模式}}void write(File f) throws IOException{FileOutputStream fo=new FileOutputStream(f);@SuppressWarnings("resource")ObjectOutputStream oo=new ObjectOutputStream(fo);oo.writeObject(bo.dpl.da);}//序列化写void read(File f) throws IOException, ClassNotFoundException{FileInputStream fi=new FileInputStream(f);@SuppressWarnings("resource")ObjectInputStream oi=new ObjectInputStream(fi);DArray dp=(DArray)oi.readObject();bo.dpl.da=dp;}//序列化读
}public class DrawBoard extends JFrame{JPanel menu;JButton open,save,color,fill,bgc;JPanel tool;JButton draw,line,el,rect;DrawPanel dpl;JTextArea message;JScrollPane frame;DrawBoard(String title){super();this.setTitle(title);menu=new JPanel(new GridLayout(1,5));open=new JButton("打开");save=new JButton("保存");color=new JButton("红色");fill=new JButton("黑色");bgc=new JButton("蓝色");menu.add(open);menu.add(save);menu.add(color);menu.add(fill);menu.add(bgc);tool=new JPanel(new GridLayout(4,1));draw=new JButton("圆");line=new JButton("直线");el=new JButton("椭圆");rect=new JButton("矩形");tool.add(draw);tool.add(line);tool.add(el);tool.add(rect);dpl=new DrawPanel();frame = new JScrollPane(message);this.getContentPane().add("North",menu);this.getContentPane().add("West",tool);this.getContentPane().add("Center",dpl);this.getContentPane().add("South",frame);addli();this.setSize(800,500);this.setDefaultCloseOperation(EXIT_ON_CLOSE);this.setVisible(true);   }void addli(){MTLis m =new MTLis(this);open.addActionListener(m);save.addActionListener(m);color.addActionListener(m);fill.addActionListener(m);bgc.addActionListener(m);draw.addActionListener(m);line.addActionListener(m);el.addActionListener(m);rect.addActionListener(m);}//加入监听器public static void main(String[]arg){DrawBoard d=new DrawBoard("Test");}
}

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