package hh;

import java.awt.*;
import java.awt.event.*;
import java.util.*;

import javax.swing.*;

import java.awt.geom.*;

class Point
{
      int x,y;
      Color col;
      int tool;
      int boarder;
      Point(int x, int y, Color col, int tool, int boarder)
      {
            this.x = x;
            this.y = y;
            this.col = col;
            this.tool = tool;
            this.boarder = boarder;
       }
}

/*
*BasicStroke
*Choice
*validate();
**/

class paintboard extends Frame implements ActionListener, MouseMotionListener, MouseListener, ItemListener
{
     int xx0=0,yy0=0;
     int xx1=0,yy1=0;
     int type=6;
     int x = -1, y = -1;
     int con = 1;         //画笔大小
     int Econ = 5;        //橡皮大小
     int toolFlag = 0;  //toolFlag:工具标记
                       //toolFlag工具对应表：
                      //（0--画笔）；（1--橡皮）；（2--清除）；
                  //（3--直线）；（4--圆）；（5--矩形）；
                 
     Color c = new Color(0,0,0); //画笔颜色
BasicStroke size = new BasicStroke (con,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);//画笔粗细
     Point cutflag = new Point(-1, -1, c, 6, con);//截断标志
     Vector paintInfo = null;//点信息向量组
     int n = 1;

     // *工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除*/
     Panel toolPanel;
     Button eraser, drLine,drCircle,drRect;
     Button clear ,pen;
     Choice ColChoice,SizeChoice,EraserChoice;
     Button colchooser;
     Label 颜色,大小B,大小E;
     
       paintboard(String s)//构造函数
     {
            super(s);
            addMouseMotionListener(this);
            addMouseListener(this);
            paintInfo = new Vector();
         
/*各工具按钮及选择项*/
           
            //颜色选择
            ColChoice = new Choice();
            ColChoice.add("黑色");
            ColChoice.add("红色");
            ColChoice.add("蓝色");
            ColChoice.add("绿色");
            ColChoice.addItemListener(this);
            
//画笔大小选择
            SizeChoice = new Choice();
            SizeChoice.add("1");
            SizeChoice.add("3");
            SizeChoice.add("5");
            SizeChoice.add("7");
            SizeChoice.add("9");
            SizeChoice.addItemListener(this);
//橡皮大小选择
            EraserChoice = new Choice();
            EraserChoice.add("2");
            EraserChoice.add("3");
            EraserChoice.add("4");
            EraserChoice.add("5");
            EraserChoice.addItemListener(this);
            
            toolPanel = new Panel();
            clear = new Button("清除");
            eraser = new Button("橡皮");
            pen = new Button("画笔");
            drLine = new Button("画直线");
            drCircle = new Button("画圆形");
            drRect = new Button("画矩形");
            colchooser = new Button("显示调色板");
            
            //各组件事件监听
            clear.addActionListener(this);
            eraser.addActionListener(this);
            pen.addActionListener(this);
            drLine.addActionListener(this);
            drCircle.addActionListener(this);
            drRect.addActionListener(this);
            colchooser.addActionListener(this);      
   
  颜色 = new Label("画笔颜色",Label.CENTER);
            大小B = new Label("画笔大小",Label.CENTER);
            大小E = new Label("橡皮大小",Label.CENTER);
           
 //面板添加组件
            toolPanel.add(pen);
            toolPanel.add(drLine);
            toolPanel.add(drCircle);
            toolPanel.add(drRect);
            toolPanel.add(颜色); toolPanel.add(ColChoice);
            toolPanel.add(大小B); toolPanel.add(SizeChoice);
            toolPanel.add(colchooser);
            toolPanel.add(eraser);
            toolPanel.add(大小E); toolPanel.add(EraserChoice);
            toolPanel.add(clear);
           
 //工具面板到APPLET面板
            add(toolPanel,BorderLayout.NORTH);
            setBounds(60,60,800,650);
            setVisible(true);
            validate();
            
            //dialog for save and load
            addWindowListener(new WindowAdapter()
            {
                  public void windowClosing(WindowEvent e)
                   { System.exit(0);}
            });
      }
      
     public void paint(Graphics g)
     {
          Graphics2D g2d = (Graphics2D)g;
          Point p1,p2;
        n = paintInfo.size();
        if(toolFlag==2)
           g.clearRect(0,0,getSize().width,getSize().height);//清除
           
          switch(type)
          {
            case 3:
                   Line2D line = new Line2D.Double(xx0,yy0,xx1,yy1);
                    g2d.draw(line);
                   break;
            case 4:
                   Ellipse2D ellipse1 = new Ellipse2D.Double(xx0, yy0,  Math.abs(xx1-xx0) ,Math.abs(yy1-yy0));
                   g2d.draw(ellipse1);
                   break;
            case 5:
                   Rectangle2D rect1 = new Rectangle2D.Double(xx0, yy0, Math.abs(xx1-xx0) , Math.abs(yy1-yy0));
                   g2d.draw(rect1);
                   break;
                   default:break;
          }
         
       for(int i=0; i<n-1; i++)
       {
         p1 = (Point)paintInfo.elementAt(i);
         p2 = (Point)paintInfo.elementAt(i+1);
         size = new BasicStroke(p1.boarder,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);                  g2d.setColor(p1.col);
         g2d.setStroke(size);
     if(p1.tool==p2.tool)
         {               
switch(p1.tool)
             {
               case 0://画笔
                      Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x,p2.y);
                      g2d.draw(line1);
                      break;
               case 1://橡皮
                      g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder);
                      break;
               case 3://画直线
                      Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y);
                      g2d.draw(line2);
                      break;
               case 4://画圆
                      Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) ,Math.abs(p2.y-p1.y));
                      g2d.draw(ellipse);
                      break;
               case 5://画矩形
                      Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) ,Math.abs(p2.y-p1.y));
                      g2d.draw(rect);
                      break;
               case 6://截断，跳过
                      i=i+1;
                      break;
               default :break;
                         }//end switch
                   }//end if
             }//end for
     }  

   public void itemStateChanged(ItemEvent e)
     {
            if(e.getSource()==ColChoice)//预选颜色
            {
                  String name = ColChoice.getSelectedItem();
                  if(name=="黑色")
                              { c = new Color(0,0,0); }
                  else if(name=="红色")
                               { c = new Color(255,0,0); }
                  else if(name=="绿色")
                               { c = new Color(0,255,0); }
                  else if(name=="蓝色")
                               { c = new Color(0,0,255); }
            }
            else if(e.getSource()==SizeChoice)//画笔大小
             {
                  String selected = SizeChoice.getSelectedItem();
          if(selected=="1")
             {
                con = 1;
                size = new BasicStroke(con,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
                       }
          else if(selected=="3")
              {
                 con = 3;
                 size = new BasicStroke(con,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
                      }
          else if(selected=="5")
              {
con = 5;
                 size = new BasicStroke(con,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
                      }
          else if(selected=="7")
               {
con = 7;
                 size = new BasicStroke(con,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
                        }
         else if(selected=="9")
                {
con = 9;
                 size = new BasicStroke(con,BasicStroke.CAP_BUTT,
BasicStroke.JOIN_BEVEL);
                      }
             }
         else if(e.getSource()==EraserChoice)//橡皮大小
            {
                  String Esize = EraserChoice.getSelectedItem();
                  if(Esize=="2")
                                   { Econ = 3*3; }
                  else if(Esize=="3")
                                   { Econ = 4*4; }
                  else if(Esize=="4")
                                   { Econ = 5*5; }
                  else if(Esize=="5")
                                   { Econ = 6*6; }
           }
     }
         
 public void mouseDragged(MouseEvent e)
     {
           xx1 = (int)e.getX();
           yy1 = (int)e.getY();
            Point p1 ;
        switch(toolFlag){
            case 0://画笔
               x = (int)e.getX();
               y = (int)e.getY();
               p1 = new Point(x, y, c, toolFlag, con);
             paintInfo.addElement(p1);
               repaint();
               break;
               
            case 1://橡皮
               x = (int)e.getX();
               y = (int)e.getY();
               p1 = new Point(x, y, null, toolFlag, Econ);
               paintInfo.addElement(p1);
               repaint();
               break;               
case 3:
           case 4:     
           case 5:
               repaint();
               break;
           default :
            }
//repaint();
     }   

public void mousePressed(MouseEvent e)
     {
         xx0= (int)e.getX();
          yy0= (int)e.getY();
            Point p2;
       switch(toolFlag)
{
           case 3://直线
               type=3;
               x = (int)e.getX();
               y = (int)e.getY();
               p2 = new Point(x, y, c, toolFlag, con);
               paintInfo.addElement(p2);
               break;
               
           case 4: //圆
               type=4;
               x = (int)e.getX();
               y = (int)e.getY();
               p2 = new Point(x, y, c, toolFlag, con);
               paintInfo.addElement(p2);
               break;
               
           case 5: //矩形
               type=5;
               x = (int)e.getX();
               y = (int)e.getY();
               p2 = new Point(x, y, c, toolFlag, con);
               paintInfo.addElement(p2);
               break;
               
          default :type=6;
            }
     }
     
     public void mouseEntered(MouseEvent e){}
     public void mouseExited(MouseEvent e){}
     public void mouseClicked(MouseEvent e){}
     public void mouseMoved(MouseEvent e){}     
public void actionPerformed(ActionEvent e)
     {
            if(e.getSource()==pen)//画笔
                                     { toolFlag = 0; }
            if(e.getSource()==eraser)//橡皮
                                    { toolFlag = 1; }
            if(e.getSource()==clear)//清除
                                    {
                                      toolFlag = 2;
                                      paintInfo.removeAllElements();
                                      repaint();
                                    }
            if(e.getSource()==drLine)//画线
                                    { toolFlag = 3; }
            if(e.getSource()==drCircle)//画圆
                                    { toolFlag = 4; }
            if(e.getSource()==drRect)//画矩形
                                    { toolFlag = 5; }
            if(e.getSource()==colchooser)//调色板
            {
                 Color newColor = JColorChooser.showDialog(this,
"调色板",c);
                 c = newColor;}
            }

public void mouseReleased(MouseEvent e) {
    // TODO Auto-generated method stub
   
}
     }//end
public class PaintBrush
{
      public static void main (String args[])
      {
            new paintboard("画图程序");
       }
}