之四：落子及判断输赢
“程序主界面”上落子，判断输赢，效果见下图：

准备工作：

Images文件夹下，放置black.png及white.png图片一张。

代码实现：

package com.fivechess.view;
import javax.swing.JOptionPane;

public class WhichWin extends ChessBoard2{

//判断上下输赢
public void upOrDown(int x1,int y1,int[][] position,int whichColor) {  
 int sum=1;
  //向上判断 
 for(int i=0;i<5;i++) {
 
 if(position[x1][y1]==0) {
 return;
 }   
 if(position[x1][y1-i]==position[x1][y1-i-1]) {
 sum+=1;
 }
 else {
 break;
 }
 }
 
//向下判断 
 for(int i=0;i<5;i++) {
 
 if(position[x1][y1]==0) {
 return;
 } 
 
 if(position[x1][y1+i]==position[x1][y1+i+1]) {
 sum+=1;
 }
 
 else {
 break;
 }
 }
 
 if(sum>=5) {
 if(whichColor==1) {
 JOptionPane.showMessageDialog(null,"白棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 }
 if(whichColor==0) {
 JOptionPane.showMessageDialog(null,"黑棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 }   
 
 PCChessBoard2.isClose=1;   
 initStart();
 }      
}

//判断左右输赢
public void leftOrRight(int x1,int y1,int[][] position,int whichColor) {
int sum=1;
//向左判断
for(int i=0;i<5;i++) {

 if(position[x1][y1]==0) {
 return;
 }   
 if(position[x1-i][y1]==position[x1-i-1][y1]) {
 sum+=1;
 }
 else {
 break;
 }
 }
 
//向右判断 
 for(int i=0;i<5;i++) {
 
 if(position[x1][y1]==0) {
 return;
 } 
 if(position[x1+i][y1]==position[x1+i+1][y1]) {
   sum+=1;
   }
 else {
 break;
 }
 }
 
 if(sum>=5) {
 if(whichColor==1) {
 JOptionPane.showMessageDialog(null,"白棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 }
 if(whichColor==0) {
 JOptionPane.showMessageDialog(null,"黑棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 } 
 PCChessBoard2.isClose=1;
 }
    
}

//判断左上及右下输赢
public void Obliquedirection(int x1,int y1,int[][] position,int whichColor) {
int sum=1;
//向左上判断
for(int i=0;i<5;i++) {

 if(position[x1][y1]==0) {
 return;
 }   
 if(position[x1-i][y1-i]==position[x1-i-1][y1-i-1]) {
 sum+=1;
 }
 else {
 break;
 }
 }
 
//向右判断 
 for(int i=0;i<5;i++) {
 
 if(position[x1][y1]==0) {
 return;
 }   
 if(position[x1+i][y1+i]==position[x1+i+1][y1+i+1]) {
 sum+=1;
 }
 else {
 break;
 }
 }
 
 if(sum>=5) {
 if(whichColor==1) {
 JOptionPane.showMessageDialog(null,"白棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 }
 if(whichColor==0) {
 JOptionPane.showMessageDialog(null,"黑棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 } 
 PCChessBoard2.isClose=1;
 }
    
}

//判断右上及左下输赢
public void Obliquedirection2(int x1,int y1,int[][] position,int whichColor) {
int sum=1;
//向右上判断
for(int i=0;i<5;i++) {

 if(position[x1][y1]==0) {
 return;
 }   
 if(position[x1+i][y1-i]==position[x1+i+1][y1-i-1]) {
 sum+=1;
 }
 else {
 break;
 }
 }
 
//向左下判断 
 for(int i=0;i<5;i++) {
 
 if(position[x1][y1]==0) {
 return;
 }   
 if(position[x1-i][y1+i]==position[x1-i-1][y1+i+1]) {
 sum+=1;
 }
 else {
 break;
 }
 }
 
 if(sum>=5) {
 if(whichColor==1) {
 JOptionPane.showMessageDialog(null,"白棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 }
 if(whichColor==0) {
 JOptionPane.showMessageDialog(null,"黑棋胜利，游戏结束", "消息提示", JOptionPane.INFORMATION_MESSAGE);
 } 
 PCChessBoard2.isClose=1;
 } 
}

}

修改后PCChessBoard2 类的代码

package com.fivechess.view;

import java.awt.event.MouseEvent;
import javax.swing.JOptionPane;

public class PCChessBoard2 extends ChessBoard2{

public int whichColor=0;
private int ex;
private int ey;

public static int isClose=0;

WhichWin whichwin=new WhichWin();

//落下棋子
@Override
public void mouseMoved(MouseEvent e) {
repaint();  
} 

@Override
public void mouseClicked(MouseEvent e) {

if(isClose==1) {
return;
}

 ex=e.getX();
 ey=e.getY();
 
 float x = (ex - 25) / 25;
   float y = (ey - 25) / 25;
   int x1 = (int) x;
   int y1 = (int) y;

if(whichColor==0&&position[x1][y1]==0) {
position[x1][y1]=1;//落下白棋子
whichColor=1;
}
else if(whichColor==1&&position[x1][y1]==0) {
position[x1][y1]=2;//落下黑色棋子
whichColor=0;
}

//判断各方向输赢
whichwin.upOrDown(x1,y1,position,whichColor);
whichwin.leftOrRight(x1,y1,position,whichColor);
whichwin.Obliquedirection(x1,y1,position,whichColor);
whichwin.Obliquedirection2(x1,y1,position,whichColor);

}

}

ChessBoard2类

package com.fivechess.view;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import javax.swing.JPanel;

/*

• 汇制棋盘的代码

• */
  public class ChessBoard2 extends JPanel implements MouseMotionListener,MouseListener{

  public Image chessBoardImage;
  public Image blackChess;
  public Image whiteChess;

  public static final int COLS=19;
  public static final int RAWS=19;//棋盘的行数和列数
  public int position[][]=new int[COLS][RAWS];

  public ChessBoard2() {
  chessBoardImage = Toolkit.getDefaultToolkit().getImage(“images/chessBoard.jpg”);
  blackChess= Toolkit.getDefaultToolkit().getImage(“images/black.png”);
  whiteChess= Toolkit.getDefaultToolkit().getImage(“images/white.png”);

   initStart();
   addMouseListener(this);
  

  }
  /**
  * 初始化数组为BLANK
  */
  public void initStart()
  {
  for(int i=0;i<19;i++)
  {
  for(int j=0;j<19;j++)
  {
  position[i][j]= 0;//“0”代表当前无棋子
  }
  }
  }

  //汇制棋盘
  @Override
  public void paintComponent(Graphics g) {
  super.paintComponent(g);
  g.drawImage(chessBoardImage, 0, 0,null);

   for (int i = 0; i < 19; i++) {
     for (int j = 0; j < 19; j++) {
       if (position[i][j] ==2) {
         g.drawImage(blackChess, 13+i * 25 , 13+j * 25 , null);
       } else if (position[i][j] ==1) {
         g.drawImage(whiteChess, 13+i * 25 , 13+j * 25 , null);
       }
     }
   }
  

  }

  @Override
  public void mouseClicked(MouseEvent e) {
  }
  /**
  * 按下鼠标时，记录鼠标的位置，并改写数组的数值，重新绘制图形
  * @param e
  */
  @Override
  public void mousePressed(MouseEvent e) {
  }
  @Override
  public void mouseReleased(MouseEvent e) {
  }

   @Override
   public void mouseEntered(MouseEvent e) {
   }
  
   @Override
   public void mouseExited(MouseEvent e) {
   }
   @Override
   public void mouseDragged(MouseEvent e) {
   // TODO Auto-generated method stub
   }
   @Override
   public void mouseMoved(MouseEvent e) {
   // TODO Auto-generated method stub
   }
  

}