之前的两篇文章：java实现两人五子棋游戏(二) 画出棋盘；java实现两人五子棋游戏(三) 画出棋子；java实现两人五子棋游戏(四) 落子动作的实现，可以点击查看。
前面我们已经画好了棋盘、棋子并且可以自由的落子了，那么接下来要实现的功能是判断是否有五连珠（暂时不考虑行棋方）。
我们采用遍历棋盘已经落子的位置，查看每个落子点，在它的上下，左右，左下右上，左上右下四个方向的任一方向上是否有五个连续的棋子。
第一步，对棋子类进行改造，之前我们的棋子类只有颜色信息和落子状态，现在要新增一个int型的数据，用于记录遍历过程中当前有几个珠子已知连续。
chessman.java
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package xchen.test.simplegobang;
public class chessman {
private int color;//1-white，0-black
private boolean placed = false;
int matchcount = 1;
public chessman(int color,boolean placed){
this.color=color;
this.placed=placed;
}
public boolean getplaced() {
return placed;
}
public void setplaced(boolean placed) {
this.placed = placed;
}
public int getcolor() {
return color;
}
public void setcolor(int color) {
this.color = color;
}
}
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第二步，先从一个方向上判断是否有五连珠，这里采用左右方向作为尝试。
添加了一个iswin函数，用遍历整个棋盘上的有效棋子的方式，来进行胜出判断。
drawchessboard.java
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package xchen.test.simplegobang;
import java.awt.graphics;
import java.awt.graphics2d;
import java.awt.radialgradientpaint;
import java.awt.image;
import java.awt.toolkit;
import java.awt.event.mouseevent;
import java.awt.event.mouselistener;
import java.awt.color;
import javax.swing.jpanel;
public class drawchessboard extends jpanel implements mouselistener{
final static int black=0;
final static int white=1;
public int chesscolor = black;
int chessman_width=30;
public image boardimg;
final private int rows = 19;
chessman[][] chessstatus=new chessman[rows+1][rows+1];
public drawchessboard() {
boardimg = toolkit.getdefaulttoolkit().getimage("res/drawable/chessboard2.png");
if(boardimg == null)
system.err.println("png do not exist");
addmouselistener(this);
}
@override
protected void paintcomponent(graphics g) {
// todo auto-generated method stub
super.paintcomponent(g);
int imgwidth = boardimg.getheight(this);
int imgheight = boardimg.getwidth(this);
int fwidth = getwidth();
int fheight= getheight();
int x=(fwidth-imgwidth)/2;
int y=(fheight-imgheight)/2;
int span_x=imgwidth/rows;
int span_y=imgheight/rows;
g.drawimage(boardimg, x, y, null);
//画横线
for(int i=0;i<rows;i++)
{
g.drawline(x, y+i*span_y, fwidth-x,y+i*span_y);
}
//画竖线
for(int i=0;i<rows;i++)
{
g.drawline(x+i*span_x, y, x+i*span_x,fheight-y);
}
//画棋子
for(int i=0;i<rows+1;i++)
{
for(int j=0;j<rows+1;j++)
{
if(chessstatus[i][j]!=null&&chessstatus[i][j].getplaced()==true)
{
//system.out.println("draw chessman "+i+" "+j);
int pos_x=x+i*span_x;
int pos_y=y+j*span_y;
float radius_b=40;
float radius_w=80;
float[] fractions = new float[]{0f,1f};
java.awt.color[] colors_b = new java.awt.color[]{color.black,color.white};
color[] colors_w = new color[]{color.white,color.black};
radialgradientpaint paint;
if(chessstatus[i][j].getcolor()==1)
{
//system.out.println("draw white chess");
paint = new radialgradientpaint(pos_x-chessman_width/2f, pos_y-chessman_width/2f, radius_w*2, fractions, colors_w);
}else{
//system.out.println("draw black chess");
paint = new radialgradientpaint(pos_x-chessman_width/2f, pos_y-chessman_width/2f, radius_b*2, fractions, colors_b);
}
((graphics2d)g).setpaint(paint);
((graphics2d)g).filloval(pos_x-chessman_width/2,pos_y-chessman_width/2,chessman_width,chessman_width);
}
}
}
}
@override
//当用户按下鼠标按钮时发生
public void mousepressed(mouseevent e) {
int point_x=e.getx();
int point_y=e.gety();
int imgwidth = boardimg.getheight(this);
int imgheight = boardimg.getwidth(this);
int fwidth = getwidth();
int fheight= getheight();
int x=(fwidth-imgwidth)/2;
int y=(fheight-imgheight)/2;
int span_x=imgwidth/rows;
int span_y=imgheight/rows;
//system.out.println("press");
int status_x = 0;
int status_y = 0;
if(point_x>=x && point_x<=x+imgwidth && point_y>=y && point_y <= y+imgheight)
{
//system.out.println("合法");
for(int i=0;i<rows+1;i++)
{
if(point_x>=x-chessman_width/2+1+i*span_x)
{
if(point_x<=x+chessman_width/2-1+i*span_x)//如果是width/2会在中间点出现两个匹配值
{
//system.out.println("point x "+i+" "+point_x+" "+(x-chessman_width/2+i*span_x)+" "+(x+chessman_width/2+i*span_x));
status_x = i;
}
}
}
for(int i=0;i<rows+1;i++)
{
if(point_y>=y-chessman_width/2+1+i*span_y)
{
if(point_y <= y+chessman_width/2-1+i*span_y)
{
//system.out.println("point y "+i+" "+point_y+" "+(y-chessman_width/2+1+i*span_y)+" "+(y+chessman_width/2-1+i*span_y));
status_y = i;
}
}
}
chessman chessman = new chessman(black, true);
chessstatus[status_x][status_y]=chessman;
repaint();
if(iswin(status_x, status_y, chessstatus))
{
system.out.println("win!!!!!");
}
}
}
@override
//当用户按下并松开鼠标按钮时发生
public void mouseclicked(mouseevent e) {
// todo auto-generated method stub
}
@override
public void mousereleased(mouseevent e) {
// todo auto-generated method stub
}
@override
public void mouseentered(mouseevent e) {
// todo auto-generated method stub
}
@override
public void mouseexited(mouseevent e) {
// todo auto-generated method stub
}
boolean iswin(int point_x,int point_y,chessman[][] cm)
{
//int matchcount = 1;//记录连珠的数目
//横向查找
for(int i=0;i<rows+1;i++)
{
for(int j=0;j<rows+1;j++)
{
if(chessstatus[i][j]!=null&&chessstatus[i][j].getplaced()==true)
{
//system.out.println("iswin:"+i+" "+j);
//向右侧查找
for(int n=1;n<=4;n++)
{
if((i+n>=0)&&(i+n)<=rows)
{
if(chessstatus[i+n][j]!=null&&chessstatus[i+n][j].getplaced()==true)
{
chessstatus[i][j].matchcount++;
system.out.println("pos:"+i+" "+j+" right count++:"+(i+n)+" "+j+" count:"+chessstatus[i][j].matchcount);
if(chessstatus[i][j].matchcount==5)
{
return true;
}
}else
{
break;
}
}
}
//向左侧查找
for(int n=1;n<=4;n++)
{
if((i-n>=0)&&(i-n)<=rows)
{
if(chessstatus[i-n][j]!=null&&chessstatus[i-n][j].getplaced()==true)
{
chessstatus[i][j].matchcount++;
system.out.println("pos:"+i+" "+j+" "+"left count++:"+(i-n)+" "+j+" count:"+chessstatus[i][j].matchcount);
if(chessstatus[i][j].matchcount==5)
{
return true;
}
}else
{
if(chessstatus[i-n][j]!=null)
{
chessstatus[i][j].matchcount = 1;
}
break;
}
}
}
chessstatus[i][j].matchcount=1;//refresh count
}
}
}
return false;
}
}
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第三步，主模块不变，运行测试一下我们的算法是否正确
main.java
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package xchen.test.simplegobang;
import java.awt.container;
import javax.swing.jframe;
import xchen.test.simplegobang.drawchessboard;
public class main extends jframe{
private drawchessboard drawchessboard;
public main() {
drawchessboard = new drawchessboard();
//frame标题
settitle("单机五子棋");
container containerpane =getcontentpane();
containerpane.add(drawchessboard);
}
public static void main(string[] args) {
main m = new main();
m.setsize(800, 800);
m.setvisible(true);
}
}
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第四步，现在我们一个方向上的判断已经做好了，接下来补全其他三个方向上的判断代码
补足drawchessboard.java中的iswin()函数