下面是我参考别人的代码编写的中国象棋，其中的逻辑什么如果有错还请大家提出来啊。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>中国象棋</title>
<style type="text/css">
body{
background: #eee;
}
#canvas,#canvas1{
position: absolute;
left: 50%;
top: 50%;
/*宽度是250px,高度是250px*/
margin-left: -250px;
margin-top: -250px;
}
/*层级较高*/
#canvas{
z-index: 10;
}
/*层级低但是有背景颜色*/
#canvas1{
z-index: 1;
background: #b3b37d;
}
#title{
width: 100px;
height: 50px;
position: absolute;
left: 50%;
top: 50%;
margin-left: -50px;
margin-top: -280px;
text-align: center;
}
</style>
</head>
<body onselectstart="return false;">
<h2 id="title"></h2>
<canvas id="canvas" width="" height=""></canvas>
<canvas id="canvas1" width="" height=""></canvas>
</body>
</html>
<script type="text/javascript">
//开始画象棋布局
//定义一个棋盘所有的棋子，这是一个二维数组
var chess = [
//['名称(txt)','横坐标x','纵坐标y','哪边下子','判断是红棋还是黑棋','判断是什么棋']
//chess.length = 32，一共32颗棋子
['车',50,50,1,1,1],['车',450,50,1,1,1],
['馬',100,50,1,1,2],['馬',400,50,1,1,2],
['象',150,50,1,1,3],['象',350,50,1,1,3],//3
['士',200,50,1,1,4],['士',300,50,1,1,4],//4
['帅',250,50,1,1,5],//5
['炮',100,150,1,1,6],['炮',400,150,1,1,6],//6
['兵',50,200,1,1,7],['兵',150,200,1,1,7],['兵',250,200,1,1,7],['兵',350,200,1,1,7],['兵',450,200,1,1,1,7],//7
['车',50,500,1,0,1],['车',450,500,1,0,1],
['馬',100,500,1,0,2],['馬',400,500,1,0,2],
['象',150,500,1,0,3],['象',350,500,1,0,3],
['士',200,500,1,0,4],['士',300,500,1,0,4],
['将',250,500,1,0,5],
['炮',100,400,1,0,6],['炮',400,400,1,0,6],
['卒',50,350,1,0,7],['卒',150,350,1,0,7],['卒',250,350,1,0,7],['卒',350,350,1,0,7],['卒',450,350,1,0,7]
];
//建一个数组来存放我们点击的那个棋子的所有参数
//参数：x坐标，y坐标，哪边下子，判断是红棋还是黑棋，判断是什么棋
var desc_click = [0,0,0,-1,0];
//判断当前是哪边出手1表示"汉方"0表示"楚方"
var whose = 1;
window.onload = function (){
var canvas = document.getElementById("canvas");
var canvas1 = document.getElementById("canvas1");
canvas.width = 500;
canvas.height = 550;
canvas1.width = 500;
canvas1.height = 550;
var context = canvas.getContext("2d");
var context1 = canvas1.getContext("2d");
draw_ChessBoard(context1);//画棋盘
draw_Chess_All(context);//画棋子
update_h2();//更换当前的出手的人
canvas.onclick = function(e){
//三个参数 第一个是当前的context，第二个是点击的棋子到画板左边的距离，第三个是当前点击的棋子到画板上边的距离
get_Chess(context,e.clientX - canvas.offsetLeft,e.clientY - canvas.offsetTop);
update_h2();
};
}
//获取棋子 三个参数 第一个是在canvas上画 第二个是坐标x第三个是坐标y
function get_Chess(context,x,y){
//定义俩个变量
var sub_x = 0,sub_y = 0;
if (x<30||y<30||x>470||y>570) {return false};
//这里就是一个四舍五入和向下取整，以便棋子能在棋盘上按格走
if (x%100>80||x%100<20) {sub_x = 100*Math.round(x/100)};
if (x%100>30&&x%100<70) {sub_x = x>100?(Math.floor(x/100)*100 + 50):50};
if (y%100>80||y%100<20) {sub_y = 100*Math.round(y/100)};
if (y%100>30&&y%100<70) {sub_y = y>100?(Math.floor(y/100)*100 + 50):50};
if(sub_x > 0 && sub_y > 0){
for (var i = 0;i < chess.length; i++) {
if (chess[i][1] == sub_x && chess[i][2] == sub_y && chess[i][3] > 0) {
if (chess[i][4] == whose) {//可见第5个参数是判断当前该哪边出手的数
draw_check(context,sub_x,sub_y);//画棋子
//参数：x坐标,y坐标，数组里的第几个，数组的第五个参数即该哪边下，第六个参数
desc_click = [sub_x,sub_y,i,chess[i][4],chess[i][5]];
return false;
}
if(desc_click[3] == whose&&chess[i][4]!=whose){
//这一步判断是否成功换人下子
if(go(sub_x,sub_y,desc_click[4],true)){
chess[desc_click[2]][1] = sub_x;//
chess[desc_click[2]][2] = sub_y;//
chess[i][3] = 0;//棋子第三个参数赋值为0
whose = whose == 0?1:0;//是不是"楚"如果是就换，如果不是就是"楚"
repaint(context);//调用函数重新画整个棋盘
if(chess[i][5] == 5) {document.getElementById("canvas").onclick = null;}//
}
}
return false;
}
}
}
if(sub_x >= 50&&sub_x<=450&&sub_y>=50&&sub_y<=550&&desc_click[3] == whose){
if(go(sub_x,sub_y,desc_click[4])){
chess[desc_click[2]][1] = sub_x;
chess[desc_click[2]][2] = sub_y;
repaint(context);
desc_click = [0,0,0,-1,0];
whose = whose ==0?1:0;
}
}
}
function repaint(context){
context.clearRect(0,0,500,550);
draw_Chess_All(context);
}
//画棋盘
function draw_ChessBoard(context){
//定义线宽
context.lineWidth = 2;
//开始画线
context.beginPath();
//画横线
for (var i = 1; i <= 10; i++) {
context.moveTo(50,50*i);
context.lineTo(450,50*i);
}
//画竖线
for (var i = 1; i <= 9; i++) {
context.moveTo(50*i,50);
context.lineTo(50*i,500);
}
context.stroke();
//画中心的斜线
context.beginPath();
context.moveTo(200,50);
context.lineTo(300,150);
context.moveTo(300,50);
context.lineTo(200,150);
context.moveTo(200,400);
context.lineTo(300,500);
context.moveTo(300,400);
context.lineTo(200,500);
context.stroke();
context.beginPath();
for (var i = 0; i < 2; i++) {
for (var j = 0; j < 2; j++) {
//绘制炮的位置的四个标记
//绘制左上角的
context.moveTo(85 + 300*i,145 + 250*j);
context.lineTo(95 + 300*i,145 + 250*j);
context.lineTo(95 + 300*i,135 + 250*j);
//绘制右上角的
context.moveTo(105 + 300*i,135 + 250*j);
context.lineTo(105 + 300*i,145 + 250*j);
context.lineTo(115 + 300*i,145 + 250*j);
//绘制左下角
context.moveTo(85 + 300*i,155 + 250*j);
context.lineTo(95 + 300*i,155 + 250*j);
context.lineTo(95 + 300*i,165 + 250*j);
//绘制右下角
context.moveTo(105 + 300*i,165 + 250*j);
context.lineTo(105 + 300*i,155 + 250*j);
context.lineTo(115 + 300*i,155 + 250*j);
}
}
context.stroke();
//临时存储一下
context.save();
//画最外层的粗线条边框
context.beginPath();
context.lineWidth = 3;
context.strokeRect(46,46,408,458);
context.fillStyle = "#b3b37d";
context.fillRect(51,251,398,48);
context.restore();
context.save();
context.font = "bold 40px KaiTi_GB2312";
context.translate(100,295);
context.rotate(-90*Math.PI/180);
context.fillText("楚",0,40);
context.restore();
context.save();
context.font = "bold 40px KaiTi_GB2312";
context.translate(150,295);
context.rotate(-90*Math.PI/180);
context.fillText("河",0,40);
context.restore();
context.save();
context.font = "bold 40px KaiTi_GB2312";
context.translate(400,255);
context.rotate(90*Math.PI/180);
context.fillText("汉",0,40);
context.restore();
context.save();
context.font = "bold 40px KaiTi_GB2312";
context.translate(350,255);
context.rotate(90*Math.PI/180);
context.fillText("界",0,40);
context.restore();
}
//
function draw_Chess_All(context){
for (var i = 0;i < chess.length; i++) {
if (chess[i][3]>0) {
draw_Chess_One(context,chess[i][1],chess[i][2],chess[i][0],chess[i][4]);
}
}
}
//绘制棋子 参数：context即当前的画板 x坐标 y坐标 填充的文字 判断是红棋还是黑棋
function draw_Chess_One(context,x,y,txt,p){
//p值是判断是黑棋还是红棋
var color = p>0?"#ff0000":"#000000";
context.save();
context.beginPath();
//棋子颜色填充用的是渐变
var b_Color = context.createLinearGradient(x+15,y-15,x-15,y+15);
b_Color.addColorStop(0,"#f3f5d5");
b_Color.addColorStop(1,"#8c834d");
//棋子的样式
context.arc(x,y,22,0,2*Math.PI);
context.fillStyle = b_Color;
context.fill();
//开始画棋子
context.beginPath();
context.arc(x,y,17,0,2*Math.PI);
context.fillStyle = "#f5da94";
context.strokeStyle = "#c9c876";
context.stroke();
context.fill();
context.beginPath();
context.fillStyle = color;
context.font = "900 24px KaiTi_GB2312";
context.fillText(txt,x-12,y+8);
context.restore();
}
//绘制选中某个棋子的那个框
function draw_check(context,x,y){
//重新画整个棋盘
repaint(context);
//开始画左上角
context.beginPath();
context.moveTo(x-23,y-10);
context.lineTo(x-23,y-23);
context.lineTo(x-10,y-23);
//开始画右上角
context.moveTo(x+10,y-23);
context.lineTo(x+23,y-23);
context.lineTo(x+23,y-10);
//开始画左下角
context.moveTo(x-23,y+10);
context.lineTo(x-23,y+23);
context.lineTo(x-10,y+23);
//开始画右下角
context.moveTo(x+23,y+10);
context.lineTo(x+23,y+23);
context.lineTo(x+10,y+23);
context.stroke();
}
//吃子
function go(x2,y2,txt,eat){
//定义x1是点击的那个对象数组的第一个值 y1是第二个值
var x1 = desc_click[0];
var y1 = desc_click[1];
//定义最大值和最小值
var min_x = x1 > x2?x2:x1;
var max_x = x1 > x2?x1:x2;
var min_y = y1 > y2?y2:y1;
var max_y = y1 > y2?y1:y2;
//定义是否可以吃子
var can_go = true;
var num = 0;
//判断是不是俩个将帅面对面
if (is_face_to_face(x2)) {
return false;
}
//下棋
switch (txt){
case 1:
// 如果俩车不在同一条直线上
if(x1!=x2&&y1!=y2){
//不能吃子
can_go = false;
break;
}
//开始遍历
for(var i = 0;i < chess.length; i++){
//
if(chess[i][1] == x1 && chess[i][2] > min_y && chess[i][2] < max_y && chess[i][3] != 0){
can_go = false;
}
//
if(chess[i][2] == y1 && chess[i][1] > min_x && chess[i][1] < max_x && chess[i][3] != 0){
can_go = false;
}
}
break;
case 2://如果是马怎么走
can_go = false;
if(x1-50==x2&&y1-100==y2&&!is_chess(x1,y1-50)){can_go = true};
if(x1+50==x2&&y1-100==y2&&!is_chess(x1,y1-50)){can_go = true};
if(x1-50==x2&&y1+100==y2&&!is_chess(x1,y1+50)){can_go = true};
if(x1+50==x2&&y1+100==y2&&!is_chess(x1,y1+50)){can_go = true};
if(x1-100==x2&&y1-50==y2&&!is_chess(x1-50,y1)){can_go = true};
if(x1-100==x2&&y1+50==y2&&!is_chess(x1-50,y1)){can_go = true};
if(x1+100==x2&&y1-50==y2&&!is_chess(x1+50,y1)){can_go = true};
if(x1+100==x2&&y1+50==y2&&!is_chess(x1+50,y1)){can_go = true};
break;
case 3://象怎么走
can_go = false;
if(whose == 1 && y2 > 250) {break};
if(whose == 0 && y2 < 300) {break};
if(x1-100==x2&&y1-100==y2&&!is_chess(x1-50,y1-50)) {can_go=true};
if(x1+100==x2&&y1-100==y2&&!is_chess(x1+50,y1-50)) {can_go=true};
if(x1-100==x2&&y1+100==y2&&!is_chess(x1-50,y1+50)) {can_go=true};
if(x1+100==x2&&y1+100==y2&&!is_chess(x1+50,y1+50)) {can_go=true};
break;
case 4://士怎么走
can_go= false;
if(x2<200||x2>300){break};
if(whose == 1&&y2>150){break};
if(x1+50==x2&&y1+50==y2){can_go = true};
if(x1+50==x2&&y1-50==y2){can_go = true};
if(x1-50==x2&&y1+50==y2){can_go = true};
if(x1-50==x2&&y1-50==y2){can_go = true};
break;
case 5://帅怎么走
can_go = false;
if(x2<200||x2>300){break};
//红棋的帅
if(whose == 1&&y2>150){break};
//黑棋的将
if(whose==0&&y2<400){break};
//判断怎么能走
if(x1+50==x2&&y1==y2){can_go=true};
if(x1-50==x2&&y1==y2){can_go=true};
if(x1==x2&&y1+50==y2){can_go=true};
if(x1==x2&&y1-50==y2){can_go=true};
break;
case 6://炮怎么走
//不能原地走
if(x1!=x2&&y1!=y2){
can_go = false;
break;
}
//如果吃子
if(eat){
for(var i = 0;i < chess.length; i++){
if(chess[i][1]==x1&&chess[i][2]>min_y&&chess[i][2]<max_y&&chess[i][3]!=0){num++};
if(chess[i][2]==y1&&chess[i][1]>min_x&&chess[i][1]<max_x&&chess[i][3]!=0){num++};
}
if(num!=1){can_go = false};
break;
}
//
for(var i=0;i<chess.length;i++){
if(chess[i][1]==x1&&chess[i][2]>min_y&&chess[i][2]<max_y&&chess[i][3]!=0){can_go = false};
if(chess[i][2]==y1&&chess[i][1]>min_x&&chess[i][1]<max_x&&chess[i][3]!=0){can_go = false};
}
break;
case 7://兵怎么走
if(whose==1&&y1>y2){can_go = false};
if(whose==0&&y1<y2){can_go = false};
if(whose==1&&y1<=250&&x1!=x2){can_go = false};
if(whose==0&&y1>=300&&x1!=x2){can_go = false};
if(max_x-min_x+max_y-min_y>50){can_go = false};
break;
}
return can_go;
}
//判断这颗棋子是否存在
function is_chess(x,y){
//定义existe判断是否这颗棋子还活着默认是死了
var existe = false;
for(var i = 0;i<chess.length;i++){
//如果某颗棋子的横纵坐标都有并且chess[i][3]任然等于1这个参数是true表示活着
if(chess[i][1]==x && chess[i][2]==y && chess[i][3]==1){existe = true;};
}
return existe;
}
//这是一个判断俩个帅是否是面对面（有bug）
function is_face_to_face(x){
//定义四个参数红色的和黑色的x,y坐标
var r_x = 0,r_y=0,b_x=0,b_y=0,num=0;
//定义一个状态
var state = false;
//
for(var i=0;i<chess.length;i++){
//chess[i][5]值就是从1到7分别代表不同的棋子，例如1表示军7表示兵卒
//5表示将帅
if(chess[i][5]==5 && chess[i][4]==1){//如果将帅活着并且1表示红棋
//获取到这个棋子的横纵坐标
r_x=chess[i][1];
r_y=chess[i][2];
}
if(chess[i][5]==5 && chess[i][4]==0){//如果将帅活着并且1表示黑棋
//获取到当前棋子的横纵坐标
b_x=chess[i][1];
b_y=chess[i][2];
}
}
//如果红色和黑色的横坐标相同时
if(r_x == b_x){
//遍历一遍chess数组
for(var i = 0;i<chess.length;i++){
//如果当前棋子的位置没变并且是红棋落子时
if(chess[i][1] == r_x && chess[i][3] > 0){num++;}
}
//？？有问题
if(num - 2 == 1 && x != r_x){state = true;}
}
return state;
}
function update_h2(){
var h2 = document.getElementById("title");
h2.innerHTML = whose == 1?"汉":"楚";
h2.style.color = whose == 1?"#ff0000":"#000";
}
</script>
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