JAVA画板（改进版）

import java.applet.Applet; import java.applet.AudioClip; import java.awt.*; import java.awt.event.*; import javax.swing.*; import sun.java2d.loops.DrawRect; import java.text.SimpleDateFormat; import java.util.*; import java.io.*; import java.awt.geom.Line2D; public class paintBoard extends JFrame { private static int Width=500; private static int Height=600;//设置窗口大小 private JLabel statusBar; //显示鼠标状态的提示条 String timeString=""; JPanel panel; private ObjectInputStream input; private ObjectOutputStream output; //定义输入输出流，用来调用和保存图像文件 private DrawPanel drawingArea; //画图区域 drawings[] itemList=new drawings[5000]; //用来存放基本图形的数组 private int currentChoice=1; //设置默认画图状态为随笔画 int index=0; //当前已经绘制的图形数目 private Color color=Color.black; //当前画笔颜色 private float stroke=1.0f; //设置画笔粗细，默认值为1.0f int R,G,B; //用来存放当前色彩值 int f1,f2; //用来存放当前字体风格 String style1; //用来存放当前字体 int music_flag=0; public paintBoard(){ setTitle("迷你小画板");//设置标题 setSize(Width,Height);//设置窗口 setAlwaysOnTop(false); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Set the window always the center of the current window Dimension scr = Toolkit.getDefaultToolkit().getScreenSize(); Dimension frm = this.getSize(); setLocation( (scr.width - frm.width) / 2, (scr.height - frm.height) / 2 - 18); //addMouseMotionListener(this); //注册监听器 实现鼠标移动接口 //addMouseListener(this); //注册监听器 实现鼠标按钮接口 drawingArea=new DrawPanel(); JMenuBar bar=new JMenuBar();//设置菜单栏 setJMenuBar(bar); JMenu fileMenu=new JMenu("文件");//创建菜单对象fileMenu JMenu paintMenu=new JMenu("图像");//创建菜单对象paintMenu JMenu fillMenu=new JMenu("填充图像");//创建菜单对象fillMenu JMenu musicMenu=new JMenu("音乐"); JMenu otherMenu=new JMenu("其它");//创建菜单对象otherMenu JMenu helpMenu=new JMenu("帮助");//创建菜单对象helpMenu fileMenu.setForeground(Color.BLUE); paintMenu.setForeground(Color.BLUE); fillMenu.setForeground(Color.BLUE); musicMenu.setForeground(Color.BLUE); otherMenu.setForeground(Color.BLUE); helpMenu.setForeground(Color.BLUE); fileMenu.setFont(new Font("华文行楷", Font.PLAIN, 20)); paintMenu.setFont(new Font("华文行楷", Font.PLAIN, 20)); fillMenu.setFont(new Font("华文行楷", Font.PLAIN, 20)); musicMenu.setFont(new Font("华文行楷", Font.PLAIN, 20)); otherMenu.setFont(new Font("华文行楷", Font.PLAIN, 20)); helpMenu.setFont(new Font("华文行楷", Font.PLAIN, 20)); bar.add(fileMenu); bar.add(paintMenu); bar.add(fillMenu); //bar.add(musicMenu); bar.add(otherMenu); bar.add(helpMenu); JMenuItem newItem=new JMenuItem("新建(N)");//创建菜单项对象newItem newItem.setFont(new Font("华文行楷", Font.PLAIN, 20)); newItem.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e) { index=0; currentChoice=3; color=Color.black; stroke=1.0f; createNewItem(); repaint();//将有关值设置为初始状态，并且重画 } }); JMenuItem openItem=new JMenuItem("打开(O)");//创建菜单项对象openItem openItem.setFont(new Font("华文行楷", Font.PLAIN, 20)); openItem.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e) { JFileChooser fileChooser=new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY); int result =fileChooser.showOpenDialog(paintBoard.this); if(result==JFileChooser.CANCEL_OPTION) return ; File fileName=fileChooser.getSelectedFile(); fileName.canRead(); if (fileName==null||fileName.getName().equals("")) JOptionPane.showMessageDialog(fileChooser,"Invalid File Name", "Invalid File Name", JOptionPane.ERROR_MESSAGE); else { try { FileInputStream fis=new FileInputStream(fileName); input=new ObjectInputStream(fis); drawings inputRecord; int countNumber=0; countNumber=input.readInt(); for(index=0;index< countNumber ;index++) { inputRecord=(drawings)input.readObject(); itemList[ index ] = inputRecord ; } createNewItem(); input.close(); repaint(); } catch(EOFException endofFileException){ JOptionPane.showMessageDialog(paintBoard.this,"no more record in file", "class not found",JOptionPane.ERROR_MESSAGE ); } catch(ClassNotFoundException classNotFoundException){ JOptionPane.showMessageDialog(paintBoard.this,"Unable to Create Object", "end of file",JOptionPane.ERROR_MESSAGE ); } catch (IOException ioException){ JOptionPane.showMessageDialog(paintBoard.this,"error during read from file", "read Error",JOptionPane.ERROR_MESSAGE ); } } } }); JMenuItem saveItem=new JMenuItem("保存(S)");//创建菜单项对象saveItem saveItem.setFont(new Font("华文行楷", Font.PLAIN, 20)); saveItem.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e) { JFileChooser fileChooser=new JFileChooser(); fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY); int result =fileChooser.showSaveDialog(paintBoard.this); if(result==JFileChooser.CANCEL_OPTION) return ; File fileName=fileChooser.getSelectedFile(); fileName.canWrite(); if (fileName==null||fileName.getName().equals("")) JOptionPane.showMessageDialog(fileChooser,"Invalid File Name", "Invalid File Name", JOptionPane.ERROR_MESSAGE); else{ try { fileName.delete(); FileOutputStream fos=new FileOutputStream(fileName); output=new ObjectOutputStream(fos); drawings record; output.writeInt( index ); for(int i=0;i< index ;i++) { drawings p= itemList[ i ] ; output.writeObject(p); output.flush(); //将所有图形信息强制转换成父类线性化存储到文件中 } output.close(); fos.close(); } catch(IOException ioe) { ioe.printStackTrace(); } } } }); JMenuItem exitItem=new JMenuItem("退出(E)");//创建菜单项对象exitItem exitItem.setFont(new Font("华文行楷", Font.PLAIN, 20)); exitItem.addActionListener( new ActionListener(){ public void actionPerformed(ActionEvent e) { System.exit(0); } } ); newItem.setMnemonic('N');//设置快捷键 openItem.setMnemonic('O'); saveItem.setMnemonic('S'); exitItem.setMnemonic('E'); newItem.setForeground(new Color(110,10,10)); openItem.setForeground(new Color(110,10,10)); saveItem.setForeground(new Color(110,10,10)); exitItem.setForeground(new Color(110,10,10)); fileMenu.add(newItem); fileMenu.addSeparator(); fileMenu.add(openItem); fileMenu.addSeparator(); fileMenu.add(saveItem); fileMenu.addSeparator(); fileMenu.add(exitItem); JMenuItem ziyouItem=new JMenuItem("自由线");//创建菜单项对象ziyouItem ziyouItem.setFont(new Font("华文行楷", Font.PLAIN, 20)); ziyouItem.addActionListener