huatu.java

画图板程序 很好用的,用他可以完成一般的画图

package huatu;
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
public class huatu extends JFrame     
 {
  private ObjectInputStream  input;
  private ObjectOutputStream output; 

  private JButton choices[];       

  private String names[]={
          "新建",
          "打开",
          "保存",    
           "铅笔",	
          "直线",	
          "空心矩形",		
          "实心矩形",	
          "空心椭圆",	
          "实心椭圆",		
          "圆",	  
          "实心圆",	
          "圆角矩形",
          "实心圆角矩形",		
          "橡皮檫",		
          "颜色",		
          "线条粗细",	
          "文字"		
          };

  private String styleNames[]={
            " 宋体 " , " 隶书 " , " 华文彩云 " , " 仿宋_GB2312 " , " 华文行楷 " ,
            " 方正舒体 " , " Times New Roman " , " Serif " , " Monospaced " ,
            " SonsSerif " , " Garamond "
            };           
   JToolBar buttonPanel ;		      
  private JLabel statusBar;            
  private DrawPanel drawingArea;       
  private int width=800,height=600;    
  drawings[] itemList=new drawings[5000]; 
  private int currentChoice=3;            
  int index=0;                         
  private Color color=Color.black;     
  int R,G,B;                           
  int f1,f2;                 
  String style1;             
  private float stroke=1.0f;
  JCheckBox bold,italic;      
  JComboBox styles;
 public huatu()       
  {
   super("Drawing Pad");
   JMenuBar bar=new JMenuBar();		
   JMenu fileMenu=new JMenu("文件");
   fileMenu.setMnemonic('F');
   JMenuItem newItem=new JMenuItem("新建");
   newItem.setMnemonic('N');
   newItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   newFile();		
                  }
          }
   );
   fileMenu.add(newItem);
   JMenuItem saveItem=new JMenuItem("保存");
   saveItem.setMnemonic('S');
   saveItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   saveFile();	
                  }
          }
   );
   fileMenu.add(saveItem);
   JMenuItem loadItem=new JMenuItem("打开");
   loadItem.setMnemonic('L');
   loadItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   loadFile();	
                  }
          }
   );
   fileMenu.add(loadItem);
   fileMenu.addSeparator();
   JMenuItem exitItem=new JMenuItem("退出");
   exitItem.setMnemonic('X');
   exitItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   System.exit(0);
                  }
          }
   );
   fileMenu.add(exitItem);
   bar.add(fileMenu);
   JMenu colorMenu=new JMenu("颜色");
   colorMenu.setMnemonic('C');
   JMenuItem colorItem=new JMenuItem("设置颜色");
   colorItem.setMnemonic('O');
   colorItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                   {
                    chooseColor();	
                   }
       }
      );
   colorMenu.add(colorItem);
   bar.add(colorMenu);
    JMenu strokeMenu=new JMenu("线条");
    strokeMenu.setMnemonic('S');

    JMenuItem strokeItem=new JMenuItem("设置线条");
    strokeItem.setMnemonic('K');
    strokeItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                    {
                     setStroke();
                     }
                   }
              );
           strokeMenu.add(strokeItem);
           bar.add(strokeMenu);
    JMenu helpMenu=new JMenu("帮助");
    helpMenu.setMnemonic('H');

    JMenuItem aboutItem=new JMenuItem("关于画图板");
    aboutItem.setMnemonic('A');
    aboutItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                    {
                     JOptionPane.showMessageDialog(null,
                        "这是一个小的画图板 由翱翔2006年制作！  ",
                        " 画图板程序说明 ",
                         JOptionPane.INFORMATION_MESSAGE );
                     }
                   }
              );
    helpMenu.add(aboutItem);
    bar.add(helpMenu);
//创建各种基本图形的按钮
    drawingArea=new DrawPanel();
    choices=new JButton[names.length];
    buttonPanel = new JToolBar( JToolBar.VERTICAL ) ;
    buttonPanel = new JToolBar( JToolBar.HORIZONTAL) ;
    ButtonHandler handler=new ButtonHandler();
    ButtonHandler1 handler1=new ButtonHandler1();
    for(int i=0;i<choices.length;i++)
    {
      choices[i]=new JButton(names[i]);
     buttonPanel.add(choices[i]);
    }

//将动作侦听器加入按钮里面
    for(int i=3;i<choices.length-3;i++)
    {
     choices[i].addActionListener(handler);
    }

    choices[0].addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   newFile();
                  }
          }
     );

    choices[1].addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   loadFile();
                  }
          }
     );

    choices[2].addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   saveFile();
                  }
          }
     );
    choices[choices.length-3].addActionListener(handler1);
    choices[choices.length-2].addActionListener(handler1);
    choices[choices.length-1].addActionListener(handler1);
//字体风格选择
    styles=new JComboBox(styleNames);
    styles.setMaximumRowCount(8);
    styles.addItemListener(
            new ItemListener(){
                    public void itemStateChanged(ItemEvent e)
                    {
                      style1=styleNames[styles.getSelectedIndex()];
                    }
               }
            );
//字体选择
    bold=new JCheckBox("BOLD");
    italic=new JCheckBox("ITALIC");
    checkBoxHandler cHandler=new checkBoxHandler();
    bold.addItemListener(cHandler);
    italic.addItemListener(cHandler);
    JPanel wordPanel=new JPanel();
    buttonPanel.add(bold);
    buttonPanel.add(italic);
    buttonPanel.add(styles);
    styles.setMinimumSize(  new Dimension ( 50, 20 ) );
    styles.setMaximumSize(new Dimension ( 100, 20 ) );
    Container c=getContentPane();
    super.setJMenuBar( bar );
    c.add(buttonPanel,BorderLayout.NORTH);
    c.add(drawingArea,BorderLayout.CENTER);
    statusBar=new JLabel();
    c.add(statusBar,BorderLayout.SOUTH);
    statusBar.setText("     Welcome To The Little Drawing Pad!!!  :)");
    createNewItem();
    setSize(width,height);
    show();
  }
//按钮侦听器ButtonHanler类，内部类，用来侦听基本按钮的操作
public class ButtonHandler implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
   for(int j=3;j<choices.length-3;j++)
   {
      if(e.getSource()==choices[j])
         {currentChoice=j;
          createNewItem();
          repaint();}
        }
    }
 }
//按钮侦听器ButtonHanler1类，用来侦听颜色选择、画笔粗细设置、文字输入按钮的操作
public class ButtonHandler1 implements ActionListener
 {
  public void actionPerformed(ActionEvent e)
  {
    if(e.getSource()==choices[choices.length-3])
         {chooseColor();}
    if(e.getSource()==choices[choices.length-2])
         {setStroke();}
    if(e.getSource()==choices[choices.length-1])
         {JOptionPane.showMessageDialog(null,
             "Please hit the drawing pad to choose the word input position",
             "Hint",JOptionPane.INFORMATION_MESSAGE );
          currentChoice=14;
          createNewItem();
          repaint();
          }
    }
 }
//鼠标事件mouseA类，继承了MouseAdapter，用来完成鼠标相应事件操作
 class mouseA extends MouseAdapter
 {
   public void mousePressed(MouseEvent e)
    {statusBar.setText("     Mouse Pressed @:[" + e.getX() +
                              ", " + e.getY() + "]");
     itemList[index].x1=itemList[index].x2=e.getX();
     itemList[index].y1=itemList[index].y2=e.getY();
    if(currentChoice==3||currentChoice==13)
    {
     itemList[index].x1=itemList[index].x2=e.getX();
     itemList[index].y1=itemList[index].y2=e.getY();
     index++;
     createNewItem();
     }
     if(currentChoice==14)
     {
      itemList[index].x1=e.getX();
      itemList[index].y1=e.getY();
      String input;
      input=JOptionPane.showInputDialog(
          "Please input the text you want!");
      itemList[index].s1=input;
      itemList[index].x2=f1;
      itemList[index].y2=f2;
      itemList[index].s2=style1;
      index++;
      currentChoice=14;
      createNewItem();
      drawingArea.repaint();
      }
    }

   public void mouseReleased(MouseEvent e)
    {statusBar.setText("     Mouse Released @:[" + e.getX() +
                           ", " + e.getY() + "]");
    if(currentChoice==3||currentChoice==13)
    {
     itemList[index].x1=e.getX();
     itemList[index].y1=e.getY();
    }
     itemList[index].x2=e.getX();
     itemList[index].y2=e.getY();
     repaint();
     index++;
     createNewItem();
    }

   public void mouseEntered(MouseEvent e)
   {
           statusBar.setText("     Mouse Entered @:[" + e.getX() +
                              ", " + e.getY() + "]");
           }

   public void mouseExited(MouseEvent e)
   {
           statusBar.setText("     Mouse Exited @:[" + e.getX() +
                              ", " + e.getY() + "]");
           }
  }
//鼠标事件mouseB类继承了MouseMotionAdapter，用来完成鼠标拖动和鼠标移动时的相应操作
 class mouseB extends MouseMotionAdapter
 {
  public void mouseDragged(MouseEvent e)
  {statusBar.setText("     Mouse Dragged @:[" + e.getX() +
                              ", " + e.getY() + "]");
   if(currentChoice==3||currentChoice==13)
   {
    itemList[index-1].x1=itemList[index].x2=itemList[index].x1=e.getX();
    itemList[index-1].y1=itemList[index].y2=itemList[index].y1=e.getY();
    index++;
    createNewItem();
   }
   else
    {
     itemList[index].x2=e.getX();
     itemList[index].y2=e.getY();
    }
   repaint();
   }

  public void mouseMoved(MouseEvent e)
   {statusBar.setText("     Mouse Moved @:[" + e.getX() +
                              ", " + e.getY() + "]");}
  }
//选择字体风格时候用到的事件侦听器类，加入到字体风格的选择框中