package MiniDrawPad;

import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;


public class MiniDrawPad extends JFrame     //主類，擴展了JFrame類，用來生成主界面
 {
  private ObjectInputStream  input;
  private ObjectOutputStream output; //定義輸入輸出流，用來調用和保存圖像文件

  private JButton choices[];         //按鈕數組，存放以下名稱的功能按鈕

  private String names[]={
          "New",
          "Open",
          "Save",    //這三個是基本操作按鈕，包括"新建"、"打開"、"保存"

        /*接下來是我們的畫圖板上面有的基本的幾個繪圖單元按鈕*/

          "Pencil",		//鉛筆畫，也就是用鼠標拖動著隨意繪圖
          "Line",		//繪制直線
          "Rect",		//繪制空心矩形
          "fRect",		//繪制以指定顏色填充的實心矩形
          "Oval",		//繪制空心橢圓
          "fOval",		//繪制以指定顏色填充的實心橢圓
          "Circle",		//繪制圓形
          "fCircle",	//繪制以指定顏色填充的實心圓形
          "RoundRect",	//繪制空心圓角矩形
          "frRect",		//繪制以指定顏色填充的實心圓角矩形
          "Rubber",		//橡皮擦，可用來擦去已經繪制好的圖案
          "Color",		//選擇顏色按鈕，可用來選擇需要的顏色
          "Stroke",		//選擇線條粗細的按鈕，輸入需要的數值可以實現繪圖線條粗細的變化
          "Word"		//輸入文字按鈕，可以在繪圖板上實現文字輸入
          };

  private String styleNames[]={
            " 宋體 " , " 隸書 " , " 華文彩云 " , " 仿宋_GB2312 " , " 華文行楷 " ,
            " 方正舒體 " , " Times New Roman " , " Serif " , " Monospaced " ,
            " SonsSerif " , " Garamond "
            };            //可供選擇的字體項
                          //當然這里的靈活的結構可以讓讀者自己隨意添加系統支持的字體

  private Icon items[];

  private String tipText[]={
                  //這里是鼠標移動到相應按鈕上面上停留時給出的提示說明條
                  //讀者可以參照上面的按鈕定義對照著理解
                "Draw a new picture",
                "Open a saved picture",
                "Save current drawing",
                "Draw at will",
                "Draw a straight line",
                "Draw a rectangle",
                "Fill a ractangle",
                "Draw an oval",
                "Fill an oval",
                "Draw a circle",
                "Fill a circle",
                "Draw a round rectangle",
                "Fill a round rectangle",
                "Erase at will",
                "Choose current drawing color",
                "Set current drawing stroke",
                "Write down what u want"
              };

  JToolBar buttonPanel ;		       //定義按鈕面板
  private JLabel statusBar;            //顯示鼠標狀態的提示條

  private DrawPanel drawingArea;       //畫圖區域
  private int width=800,height=550;    //定義畫圖區域初始大小

  drawings[] itemList=new drawings[5000]; //用來存放基本圖形的數組
  private int currentChoice=3;            //設置默認畫圖狀態為隨筆畫
  int index=0;                         //當前已經繪制的圖形數目
  private Color color=Color.black;     //當前畫筆顏色
  int R,G,B;                           //用來存放當前色彩值

  int f1,f2;                  //用來存放當前字體風格
  String style1;              //用來存放當前字體
  private float stroke=1.0f;  //設置畫筆粗細，默認值為1.0f

  JCheckBox bold,italic;      //定義字體風格選擇框
                              //bold為粗體，italic為斜體，二者可以同時使用
  JComboBox styles;

  public MiniDrawPad()        //構造函數
  {
   super("Drawing Pad");
   JMenuBar bar=new JMenuBar();		//定義菜單條
   JMenu fileMenu=new JMenu("File");
   fileMenu.setMnemonic('F');

//新建文件菜單條
   JMenuItem newItem=new JMenuItem("New");
   newItem.setMnemonic('N');
   newItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   newFile();		//如果被觸發，則調用新建文件函數段
                  }
          }
   );
   fileMenu.add(newItem);

//保存文件菜單項
   JMenuItem saveItem=new JMenuItem("Save");
   saveItem.setMnemonic('S');
   saveItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   saveFile();		//如果被觸發，則調用保存文件函數段
                  }
          }
   );
   fileMenu.add(saveItem);

//打開文件菜單項
   JMenuItem loadItem=new JMenuItem("Load");
   loadItem.setMnemonic('L');
   loadItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   loadFile();		//如果被觸發，則調用打開文件函數段
                  }
          }
   );
   fileMenu.add(loadItem);

   fileMenu.addSeparator();

//退出菜單項
   JMenuItem exitItem=new JMenuItem("Exit");
   exitItem.setMnemonic('X');
   exitItem.addActionListener(
          new ActionListener(){
                  public void actionPerformed(ActionEvent e)
                  {
                   System.exit(0);	//如果被觸發，則退出畫圖板程序
                  }
          }
   );
   fileMenu.add(exitItem);
   bar.add(fileMenu);

//設置顏色菜單條
   JMenu colorMenu=new JMenu("Color");
   colorMenu.setMnemonic('C');

//選擇顏色菜單項
   JMenuItem colorItem=new JMenuItem("Choose Color");
   colorItem.setMnemonic('O');
   colorItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                   {
                    chooseColor();	//如果被觸發，則調用選擇顏色函數段
                   }
       }
      );
   colorMenu.add(colorItem);
   bar.add(colorMenu);

//設置線條粗細菜單條
    JMenu strokeMenu=new JMenu("Stroke");
    strokeMenu.setMnemonic('S');

//設置線條粗細菜單項
    JMenuItem strokeItem=new JMenuItem("Set Stroke");
    strokeItem.setMnemonic('K');
    strokeItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                    {
                     setStroke();
                     }
                   }
              );
           strokeMenu.add(strokeItem);
           bar.add(strokeMenu);

//設置提示菜單條
    JMenu helpMenu=new JMenu("Help");
    helpMenu.setMnemonic('H');

//設置提示菜單項
    JMenuItem aboutItem=new JMenuItem("About this Drawing Pad!");
    aboutItem.setMnemonic('A');
    aboutItem.addActionListener(
           new ActionListener(){
                   public void actionPerformed(ActionEvent e)
                    {
                     JOptionPane.showMessageDialog(null,
                        "This is a mini drawing pad!\nCopyright (c) 2002 Tsinghua University ",
                        " 畫圖板程序說明 ",
                         JOptionPane.INFORMATION_MESSAGE );
                     }
                   }
              );
    helpMenu.add(aboutItem);
    bar.add(helpMenu);

    items=new ImageIcon[names.length];

//創建各種基本圖形的按鈕
    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();

//導入我們需要的圖形圖標，這些圖標都存放在與源文件相同的目錄下面
    for(int i=0;i<choices.length;i++)
    {//items[i]=new ImageIcon( MiniDrawPad.class.getResource(names[i] +".gif"));
                       //如果在jbuilder下運行本程序，則應該用這條語句導入圖片
     items[i]=new ImageIcon(names[i] + ".gif");
                   //默認的在jdk或者jcreator下運行，用此語句導入圖片
     choices[i]=new JButton("",items[i]);
     choices[i].setToolTipText(tipText[i]);
     buttonPanel.add(choices[i]);
    }

//將動作偵聽器加入按鈕里面
    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);

//字體風格選擇
    styles=new JComboBox(styleNames);
    styles.setMaximumRowCount(8);
    styles.addItemListener(
            new ItemListener(){
                    public void itemStateChanged(ItemEvent e)
                    {
                      style1=styleNames[styles.getSelectedIndex()];
                    }
               }
            );
//字體選擇
    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();
  }


//按鈕偵聽器ButtonHanler類，內部類，用來偵聽基本按鈕的操作
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();}
        }
    }
 }

//按鈕偵聽器ButtonHanler1類，用來偵聽顏色選擇、畫筆粗細設置、文字輸入按鈕的操作
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();
          }
    }
 }


//鼠標事件mouseA類，繼承了MouseAdapter，用來完成鼠標相應事件操作
 class mouseA extends MouseAdapter
 {
   public void mousePressed(MouseEvent e)
    {statusBar.setText("     Mouse Pressed @:[" + e.getX() +
                              ", " + e.getY() + "]");//設置狀態提示

     itemList[index].x1=itemList[index].x2=e.getX();
     itemList[index].y1=itemList[index].y2=e.getY();

    //如果當前選擇的圖形是隨筆畫或者橡皮擦，則進行下面的操作
    if(currentChoice==3||currentChoice==13)
    {
     itemList[index].x1=itemList[index].x2=e.getX();
     itemList[index].y1=itemList[index].y2=e.getY();
     index++;
     createNewItem();
     }

    //如果當前選擇的圖形式文字輸入，則進行下面操作
     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() + "]");
           }
  }


//鼠標事件mouseB類繼承了MouseMotionAdapter，用來完成鼠標拖動和鼠標移動時的相應操作
 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();