Java 围棋棋盘

1. 根据鼠标监听事件绘制围棋棋盘
   运行效果图：
   

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class ChessGame extends Frame{
     
	ChessBoard b=new ChessBoard();
	public ChessGame() {
     
		setBackground(Color.LIGHT_GRAY);
		setLayout(new BorderLayout());
		add("Center",b);
		Panel p=new Panel();
		Button pass=new Button("放弃一次");
		Button color=new Button("变棋盘背景");
		Button fail=new Button("认输");
		Button back=new Button("悔棋");
		p.setLayout(new GridLayout(8,1,10,10));//控制盘部分8行1列，间距为10
		p.add(new Label());//为了美观，第一行空出来
		p.add(pass);
		p.add(color);
		p.add(fail);
		p.add(back);
		add("East",p);
		addWindowListener(new WindowAdapter(){
       //内嵌窗体关闭类    
   	    	public void windowClosing(WindowEvent e){
     
   	    		dispose();
   	    	}
   	    });
		setSize(500,450);
		setVisible(true);			
	}

	public static void main(String[] args) {
     
		// TODO 自动生成的方法存根
		new ChessGame();
	}
}

class ChessBoard extends Canvas{
     
	int chess[][]=new int[19][19];
	int sx=20,sy=20;//棋盘起始坐标
	int w=20;//棋格宽度
	int cx=200,cy=200;//游标起始位置在棋盘中部
	int player=1;//1是黑子先下，0是白子
	public ChessBoard() {
     
		this.addMouseMotionListener(new MouseMotionAdapter() {
     
			public void mouseMoved(MouseEvent e) {
     
				Graphics g=getGraphics();
				//如果区域是背景颜色，将按画笔颜色替换并画出图形
				g.setXORMode(ChessBoard.this.getBackground());
				g.setColor(Color.RED);
				g.fillRect(cx-w/4, cy-w/4, w/2, w/2);//游标矩形左上角坐标（195，195）
				
				/*使游标矩形总是定位在十字实线上
				如：游标指到（35，35）位置时，绘制的游标矩形中心位置为（40，40）*/
				if(e.getX()%20>=10) {
     
					cx=(e.getX()/10+1)*10;
				}else {
     
					cx=e.getX()/10*10;
				}
				if(e.getY()%20>=10) {
     
					cy=(e.getY()/10+1)*10;
				}else {
     
					cy=e.getY()/10*10;
				}
				/*cx=sx+(e.getX()-sx+w/2)/w*w;
				cy=sy+(e.getY()-sy+w/2)/w*w;*/
				g.fillRect(cx-w/4,cy-w/4, w/2, w/2);
			}
		});
		this.addMouseListener(new MouseAdapter() {
     
			public void mouseClicked(MouseEvent e) {
     
				Graphics g=getGraphics();
				if(chess[(cx-sx)/w][(cy-sy)/w]==0) {
     
					if(player==1) {
     
						g.setColor(Color.BLACK);
						chess[(cx-sx)/w][(cy-sy)/w]=1;
					}else {
     
						g.setColor(Color.WHITE);
						chess[(cx-sx)/w][(cy-sy)/w]=2;
					}
					g.fillOval(cx-w/2+1,cy-w/2+1, w-2, w-2);
					g.setXORMode(ChessBoard.this.getBackground());
					g.setColor(Color.RED);
					g.fillRect(cx-w/4,cy-w/4, w/2, w/2);
					player=(player+1)%2;
				}
			}
		});
	}
	public void paint(Graphics g) {
     
		for(int k=0;k<19;k++) {
     
			g.drawLine(sx, sy+k*w, sx+w*18, sy+k*w);
		}
		for(int k=0;k<19;k++){
     
			g.drawLine(sx+k*w, sy, sx+k*w, sy+w*18);
		}
	/*	for(int i=0;i
	}
}