编程 Javascript
canvas 实现中国象棋

Posted in Javascript onFebruary 17, 2017
效果如下：
canvas 实现中国象棋
代码如下：
<!DOCTYPE html>
<html>
 <head>
 <meta charset="utf-8">
 <title></title>
 <style>
 #canvasWrap{
  width: 600px;
  height: 550px;
  margin: 50px auto;
 }
 #currActive{
  font-size: 20px;
  font-weight: bold;
  /*text-align: center;*/
  margin-left:230px ;
 }
 #canvas{
  float: left;
  background: #EAC591;
 }
 #panel{
  width: 80px;
  padding: 10px;
  float: right;
 }
 #ul{
  list-style: none;
  margin: 0;
  padding: 0;
 }
 #ul li{
  padding: 2px;
 }
 </style>
 <script src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
 </head>
 <body>
 <div id="canvasWrap">
  <div id="currActive"></div>
  <canvas id="canvas" width="500" height="550"></canvas>
  <div id="panel">
  <ul id="ul"></ul>
  </div>
 </div>
 <script>
  var obj = {};
  // 初始化
  obj.init = function(args){
  var canvas = document.getElementById("canvas");
  this.ctx = canvas.getContext("2d");
//  this.chunk =args&&args.chunk?args.chunk:50; 
//  this.radius =args&&args.radius?args.radius:23; 
//  this.CandidateCircleR =args&&args.ccr?args.ccr:5;
  this.radius = 23;
  this.chunk =50;
  this.CandidateCircleR = 5;
  $("#currActive").text("红方");
  this.steps = [];      // 记录步骤
  this.currActive = "red";  // 先下
  this.init_back();
  this.init_chess();
  $(canvas).unbind();
  this.addEvent();
  }
  // 棋盘初始化
  obj.init_back = function(){
  this.drawRowLine();
  this.drawColLine();
  this.ctx.clearRect(this.chunk+1, this.chunk*5+1, this.chunk*8-2, this.chunk-2);
  this.drawsharpS();
  this.drawX();
  this.drawText();
  }
  // 棋子初始化
  obj.init_chess = function(){
  var Car_b1 = {x:1,y:1,text:"?"}
  var Horse_b1 = {x:2,y:1,text:"?"}
  var Elephant_b1 = {x:3,y:1,text:"象"}
  var Scholar_b1 = {x:4,y:1,text:"士"}
  var Boss_b = {x:5,y:1,text:"将"} 
  var Scholar_b2 = {x:6,y:1,text:"士"}
  var Elephant_b2 = {x:7,y:1,text:"象"}
  var Horse_b2 = {x:8,y:1,text:"?"}
  var Car_b2 = {x:9,y:1,text:"?"}
  var Cannon_b1 = {x:2,y:3,text:"炮"}
  var Cannon_b2 = {x:8,y:3,text:"炮"}
  var Soldier_b1 = {x:1,y:4,text:"卒"}
  var Soldier_b2 = {x:3,y:4,text:"卒"}
  var Soldier_b3 = {x:5,y:4,text:"卒"}
  var Soldier_b4 = {x:7,y:4,text:"卒"}
  var Soldier_b5 = {x:9,y:4,text:"卒"}
  var Car_r1 = {x:1,y:10,text:"?"}
  var Horse_r1 = {x:2,y:10,text:"?"}
  var Elephant_r1 = {x:3,y:10,text:"相"}
  var Scholar_r1 = {x:4,y:10,text:"仕"}
  var Boss_r = {x:5,y:10,text:"帅"} 
  var Scholar_r2 = {x:6,y:10,text:"仕"}
  var Elephant_r2 = {x:7,y:10,text:"相"}
  var Horse_r2 = {x:8,y:10,text:"?"}
  var Car_r2 = {x:9,y:10,text:"?"}
  var Cannon_r1 = {x:2,y:8,text:"炮"}
  var Cannon_r2 = {x:8,y:8,text:"炮"}
  var Soldier_r1 = {x:1,y:7,text:"兵"}
  var Soldier_r2 = {x:3,y:7,text:"兵"}
  var Soldier_r3 = {x:5,y:7,text:"兵"}
  var Soldier_r4 = {x:7,y:7,text:"兵"}
  var Soldier_r5 = {x:9,y:7,text:"兵"}
  this.cheer_arr_B = [Car_b1,Horse_b1,Elephant_b1,Scholar_b1,Boss_b,Scholar_b2,Elephant_b2,Horse_b2,Car_b2,
Cannon_b1,Cannon_b2,Soldier_b1,Soldier_b2,Soldier_b3,Soldier_b4,Soldier_b5];
  this.cheer_arr_R = [Car_r1,Horse_r1,Elephant_r1,Scholar_r1,Boss_r,Scholar_r2,Elephant_r2,Horse_r2,Car_r2,
Cannon_r1,Cannon_r2,Soldier_r1,Soldier_r2,Soldier_r3,Soldier_r4,Soldier_r5];
  var that = this;
  $.each(this.cheer_arr_B,function(i,e){ 
   e.color = "#000";
   e.bgcolor = "#fff";
   e.bgColor_b = "#000";
   e.type = "black";
   that.drawPiece(e);
   that.drawChessText(e);
  });
  $.each(this.cheer_arr_R,function(i,e){ 
   e.color = "#f00";
   e.bgcolor = "#fff";
   e.bgColor_b = "#f00";
   e.type = "red";
   that.drawPiece(e);
   that.drawChessText(e);
  });
  this.cheer_arr_ALL = this.cheer_arr_B.concat(this.cheer_arr_R); 
  }
  // 更新棋局
  obj.updateChess = function(){
  this.ctx.clearRect(0,0,canvas.width,canvas.height);
  this.init_back();
  var that = this;
  $.each(this.cheer_arr_ALL,function(i,e){   
   that.drawPiece(e);
   that.drawChessText(e);
  });
  $("#ul").empty();
  $.each(this.steps,function(iii,eee){
   $("#ul").append("<li>"+eee+"</li>");
  });
  }
  // 画横线
  obj.drawRowLine = function(){
  for(var i =1;i<=10;i++){
   this.drawLine(1,i,9,i);
  }
  }
  // 画竖线
  obj.drawColLine = function(){
  for(var i =1;i<=9;i++){
   this.drawLine(i,1,i,10);
  }
  }
  // 画直线
  obj.drawLine = function(x0,y0,x1,y1,lw){
  var x0 = x0*this.chunk;
  var y0 = y0*this.chunk;
  var x1 = x1*this.chunk;
  var y1 = y1*this.chunk;
  this.ctx.beginPath();
  this.ctx.strokeStyle = "#000";
  this.ctx.lineWidth =lw?lw:1;
  this.ctx.moveTo(x0,y0);
  this.ctx.lineTo(x1,y1);
  this.ctx.stroke();
  this.ctx.closePath();
  }
  // 画#
  obj.drawsharpS = function(){
  this.round(2,3);
  this.round(8,3);
  this.round(1,4);
  this.round(3,4);
  this.round(5,4);
  this.round(7,4);
  this.round(9,4);
  this.round(2,8);
  this.round(8,8);
  this.round(1,7);
  this.round(3,7);
  this.round(5,7);
  this.round(7,7);
  this.round(9,7);
  }
  // 画单个#
  obj.round = function(x0,y0){
  var x0 = x0*this.chunk;
  var y0 = y0*this.chunk;
  this.ctx.beginPath();
  this.ctx.strokeStyle = "#000";
  this.ctx.lineWidth =1;
  if(x0!=this.chunk){
   // 左上
   this.ctx.moveTo(x0-5,y0-10);
   this.ctx.lineTo(x0-5,y0-5);
   this.ctx.lineTo(x0-10,y0-5);
   // 左下
   this.ctx.moveTo(x0-5,y0+10);
   this.ctx.lineTo(x0-5,y0+5);
   this.ctx.lineTo(x0-10,y0+5);
  }
  if(x0!=this.chunk*9){
   // 右上
   this.ctx.moveTo(x0+5,y0-10);
   this.ctx.lineTo(x0+5,y0-5);
   this.ctx.lineTo(x0+10,y0-5);
   // 右下
   this.ctx.moveTo(x0+5,y0+10);
   this.ctx.lineTo(x0+5,y0+5);
   this.ctx.lineTo(x0+10,y0+5);
  }
  this.ctx.stroke();
  this.ctx.closePath(); 
  }
  // 画X
  obj.drawX = function(){
  this.drawLine(4,1,6,3,0.5);
  this.drawLine(4,3,6,1,0.5);
  this.drawLine(4,8,6,10,0.5);
  this.drawLine(4,10,6,8,0.5);
  }
  // 画楚河/?h界
  obj.drawText = function(){
  this.ctx.font = "bold 30px Courier New";
    this.ctx.fillStyle = "#000";
    this.ctx.fillText("楚 河", this.chunk*2, this.chunk*5+this.chunk/2+10);
    this.ctx.fillText("?h 界", this.chunk*6, this.chunk*5+this.chunk/2+10);
    this.ctx.font = "12px Courier New";
    this.text_arr =["九","八","七","六","五","四","三","二","一"];
    for(var i=0;i<9;i++){
    this.ctx.fillText((i+1).toString(), this.chunk*(i+1)-5, 20);
    this.ctx.fillText(this.text_arr[i], this.chunk*(i+1)-5, this.chunk*10+30+10);
    }
  }
  // 画棋子形状
  obj.drawPiece = function(e){
  this.ctx.beginPath();
  this.ctx.fillStyle =e.bgcolor;
  this.ctx.strokeStyle = e.bgColor_b;
  this.ctx.lineWidth =2;
       this.ctx.arc(e.x*this.chunk, e.y*this.chunk, this.radius, 0, Math.PI * 2, true);
       this.ctx.closePath();
       this.ctx.fill();
       this.ctx.stroke();
  }
  // 画棋子文字
  obj.drawChessText = function(e){
  this.ctx.font = "bold 30px Courier New";
    this.ctx.fillStyle = e.color;
    var offset = this.ctx.measureText(e.text).width/2;
    this.ctx.fillText(e.text, e.x*this.chunk-offset, e.y*this.chunk+10);
  }
  // 增加点击事件
  obj.addEvent = function(){
  var that = this;
  this.checked = false;
  $(canvas).on("mousedown",function(ev){
   for(var j=1;j<=10;j++){
   for(var i=1;i<=9;i++){
    var temp_i = i*that.chunk;
    var temp_j = j*that.chunk;
    var distanct = Math.sqrt(Math.pow(temp_i-ev.offsetX,2)+Math.pow(temp_j-ev.offsetY,2));
    if(distanct<=that.radius){
    var overChess = false;
    $.each(that.cheer_arr_ALL,function(ii,ee){
     if(ee.x ==i&&ee.y==j){
     overChess = true;
     var p ={x:ee.x,y:ee.y};
//     console.log(that.checked); 
     if(that.currActive != ee.type&&!that.checked){
      return false;
     }
     if(!that.checked){
//      console.log("选中一个棋子");
      that.drawChecked(p);
      that.preChess = ee;
      that.drawCandidate();
      that.checked = true;
     }else if(that.preChess.x == ee.x&&that.preChess.y == ee.y){
//      console.log("点在原棋子上");
      that.updateChess();
      that.checked = false;
     }else if(that.preChess.type == ee.type){
//      console.log("切换棋子");
      that.updateChess();
      that.drawChecked(p);
      that.preChess = ee;
      that.drawCandidate();
     }else{
      // 是否能吃子
      if(that.Eat_rule(i,j)){
      that.eat(ii,ee,i,j);
      }else if(that.preChess.text == "帅"){ // 对将
      if(that.preChess.x == i){
       var canEat =true;
       $.each(that.cheer_arr_ALL,function(iii,eee){
       if(eee.x ==that.preChess.x&&eee.y==j){
        if(eee.text == "将"){
        for(var t=that.preChess.y-1;t>j;t--){
         if(that.inArray(that.preChess.x,t)){
         canEat = false;
         break;
         }
        }
        }else{
        canEat = false;
        }
        return false;
       }
       });
       if(canEat){
       that.eat(ii,ee,i,j);
       }
      }
      }else if(that.preChess.text == "将"){
      if(that.preChess.x == i){
       var canEat =true;
       $.each(that.cheer_arr_ALL,function(iii,eee){
       if(eee.x ==that.preChess.x&&eee.y==j){
        if(eee.text == "帅"){
        for(var t=that.preChess.y+1;t<j;t++){
         if(that.inArray(that.preChess.x,t)){
         canEat = false;
         break;
         }
        }
        }else{
        canEat = false;
        }
        return false;
       }
       });
       if(canEat){
       that.eat(ii,ee,i,j);
       }
      }
      }
     } 
     return false;
     }
    });
    if(overChess){
//     alert("点在棋子上");
    }else{
     // 是否能移动
     if(that.checked&&that.Move_rule(i,j)){
//     console.log("移动棋子");
     that.move(i,j);
     }
    }
    }
   }
   }
  });
  }
  // 记谱
  obj.note = function(ee,i,j){
  var distance = Math.abs(ee.y-j);
  var step;
  if(ee.type=="red"){
   $("#currActive").text("黑方");
   var oldP = this.text_arr[ee.x-1];
   var newP = this.text_arr[i-1];
   var num = this.text_arr[9-distance];
   if(j<ee.y){
   if(ee.x == i){
    console.log(ee.text+oldP+"进"+num);
    step = ee.text+oldP+"进"+num;
   }else{
    console.log(ee.text+oldP+"进"+newP);
    step = ee.text+oldP+"进"+newP;
   }
   }else if(j>ee.y){
   if(ee.x == i){
    console.log(ee.text+oldP+"退"+num);
    step = ee.text+oldP+"退"+num;
   }else{
    console.log(ee.text+oldP+"退"+newP);
    step = ee.text+oldP+"退"+newP;
   }
   }else{
   console.log(ee.text+oldP+"平"+newP);
   step = ee.text+oldP+"平"+newP;
   }
  }else{
   $("#currActive").text("红方");
   if(j>ee.y){
   if(ee.x == i){
    console.log(ee.text+ee.x+"进"+distance);
    step = ee.text+ee.x+"进"+distance
   }else{
    console.log(ee.text+ee.x+"进"+i);
    step = ee.text+ee.x+"进"+i;
   }
   }else if(j<ee.y){
   if(ee.x == i){
    console.log(ee.text+ee.x+"退"+distance);
    step = ee.text+ee.x+"退"+distance;
   }else{
    console.log(ee.text+ee.x+"退"+i);
    step = ee.text+ee.x+"退"+i;
   }
   }else{
   console.log(ee.text+ee.x+"平"+i);
   step = ee.text+ee.x+"平"+i;
   } 
  }
  this.steps.push(step); 
  }
  // 是否结束
  obj.isOver = function(ee){
  if(ee.text == "将"){
   alert("you win");
   $("#ul").empty();
   return true;
  }else if(ee.text == "帅"){
   alert("you lose");
   $("#ul").empty();
   return true;
  }else{
   return false;
  }
  }
  // 吃子
  obj.eat = function(ii,ee,i,j){
  this.cheer_arr_ALL.splice(ii,1);
  this.move(i,j);
  if(this.isOver(ee)){
   this.ctx.clearRect(0,0,canvas.width,canvas.height);
   this.init();
   return false;
  };
  }
  // 移动
  obj.move = function(i,j){
  var that = this;
  $.each(that.cheer_arr_ALL,function(iii,eee){
   if(eee.x ==that.preChess.x&&eee.y==that.preChess.y){
   that.note(eee,i,j);
   eee.x= i;
   eee.y = j;
   that.currActive = eee.type=="red"?"black":"red";
   return false;
   }
  });
  that.updateChess();
  that.checked = false;
  }
  // 画选中棋子状态
  obj.drawChecked = function(p){
  var temp_x = p.x*this.chunk;
  var temp_y = p.y*this.chunk;
  this.ctx.beginPath();
  this.ctx.strokeStyle = "#00f";
  this.ctx.lineWidth =1;
  this.ctx.moveTo(temp_x-this.radius,temp_y-this.radius+10);
  this.ctx.lineTo(temp_x-this.radius,temp_y-this.radius);
  this.ctx.lineTo(temp_x-this.radius+10,temp_y-this.radius);
  this.ctx.moveTo(temp_x-this.radius,temp_y+this.radius-10);
  this.ctx.lineTo(temp_x-this.radius,temp_y+this.radius);
  this.ctx.lineTo(temp_x-this.radius+10,temp_y+this.radius);
  this.ctx.moveTo(temp_x+this.radius,temp_y-this.radius+10);
  this.ctx.lineTo(temp_x+this.radius,temp_y-this.radius);
  this.ctx.lineTo(temp_x+this.radius-10,temp_y-this.radius);
  this.ctx.moveTo(temp_x+this.radius,temp_y+this.radius-10);
  this.ctx.lineTo(temp_x+this.radius,temp_y+this.radius);
  this.ctx.lineTo(temp_x+this.radius-10,temp_y+this.radius);
  this.ctx.stroke();
  this.ctx.closePath(); 
  }
  // 画候选位置
  obj.drawCandidate = function(){
  switch(this.preChess.text){
   case "?":
   var temp_y = this.preChess.y;
   while(!this.inArray(this.preChess.x,++temp_y)&&temp_y<=10){
    this.drawCandidateCircle(this.preChess.x,temp_y);
   }
   var temp_y = this.preChess.y;
   while(!this.inArray(this.preChess.x,--temp_y)&&temp_y>0){
    this.drawCandidateCircle(this.preChess.x,temp_y);
   }
   var temp_x = this.preChess.x;
   while(!this.inArray(++temp_x,this.preChess.y)&&temp_x<10){
    this.drawCandidateCircle(temp_x,this.preChess.y);
   }
   var temp_x = this.preChess.x;
   while(!this.inArray(--temp_x,this.preChess.y)&&temp_x>0){
    this.drawCandidateCircle(temp_x,this.preChess.y);
   }
   break;
   case "?":
   if(!this.inArray(this.preChess.x-2,this.preChess.y-1)
   &&this.preChess.x-2>=1&&this.preChess.y-1>=1
   &&!this.inArray(this.preChess.x-1,this.preChess.y)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-1);
   }
   if(!this.inArray(this.preChess.x-1,this.preChess.y-2)
   &&this.preChess.x-1>=1&&this.preChess.y-2>=1
   &&!this.inArray(this.preChess.x,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y-2);
   }
   if(!this.inArray(this.preChess.x+1,this.preChess.y-2)
   &&this.preChess.x+1<=9&&this.preChess.y-2>=1
   &&!this.inArray(this.preChess.x,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y-2);
   }
   if(!this.inArray(this.preChess.x+2,this.preChess.y-1)
   &&this.preChess.x+2<=9&&this.preChess.y-1>=1
   &&!this.inArray(this.preChess.x+1,this.preChess.y)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-1);
   }
   if(!this.inArray(this.preChess.x+2,this.preChess.y+1)
   &&this.preChess.x+2<=9&&this.preChess.y+1<=10
   &&!this.inArray(this.preChess.x+1,this.preChess.y)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+1);
   }
   if(!this.inArray(this.preChess.x+1,this.preChess.y+2)
   &&this.preChess.x+1<=9&&this.preChess.y+2<=10
   &&!this.inArray(this.preChess.x,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y+2);
   }
   if(!this.inArray(this.preChess.x-1,this.preChess.y+2)
   &&this.preChess.x-1>=1&&this.preChess.y+2<=10
   &&!this.inArray(this.preChess.x,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y+2);
   }
   if(!this.inArray(this.preChess.x-2,this.preChess.y+1)
   &&this.preChess.x-2>=1&&this.preChess.y+1<=10
   &&!this.inArray(this.preChess.x-1,this.preChess.y)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+1);
   }
   break;
   case "相":
   if(this.preChess.y==10){
    if(!this.inArray(this.preChess.x-2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-2);
    }
   }else if(this.preChess.y==6){
    if(!this.inArray(this.preChess.x-2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+2);
    }
   }else if(this.preChess.x==1){
    if(!this.inArray(this.preChess.x+2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+2);
    }
   }else if(this.preChess.x==9){
    if(!this.inArray(this.preChess.x-2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x-2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+2);
    }
   }else{
    if(!this.inArray(this.preChess.x+2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+2);
    }
    if(!this.inArray(this.preChess.x-2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x-2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+2);
    }
   }
   break;
   case "象":
   if(this.preChess.y==1){
    if(!this.inArray(this.preChess.x-2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+2);
    }
   }else if(this.preChess.y==5){
    if(!this.inArray(this.preChess.x-2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-2);
    }
   }else if(this.preChess.x==1){
    if(!this.inArray(this.preChess.x+2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+2);
    }
   }else if(this.preChess.x==9){
    if(!this.inArray(this.preChess.x-2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x-2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+2);
    }
   }else{
    if(!this.inArray(this.preChess.x+2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x+2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+2,this.preChess.y+2);
    }
    if(!this.inArray(this.preChess.x-2,this.preChess.y-2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y-2);
    }
    if(!this.inArray(this.preChess.x-2,this.preChess.y+2)
    &&!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-2,this.preChess.y+2);
    }
   }
   break;
   case "仕":
   if(this.preChess.x==5&&this.preChess.y==9){
    if(!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y-1);
    }
    if(!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y+1);
    }
    if(!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y-1);
    }
    if(!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y+1);
    }
   }else{
    this.drawCandidateCircle(5,9);
   }
   break;
   case "士":
   if(this.preChess.x==5&&this.preChess.y==2){
    if(!this.inArray(this.preChess.x-1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y-1);
    }
    if(!this.inArray(this.preChess.x-1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y+1);
    }
    if(!this.inArray(this.preChess.x+1,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y-1);
    }
    if(!this.inArray(this.preChess.x+1,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y+1);
    }
   }else{
    this.drawCandidateCircle(5,2);
   }
   break;
   case "帅":
   if(!this.inArray(this.preChess.x,this.preChess.y-1)&&this.preChess.y>8){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y-1);
   }
   if(!this.inArray(this.preChess.x,this.preChess.y+1)&&this.preChess.y<10){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y+1);
   }
   if(!this.inArray(this.preChess.x-1,this.preChess.y)&&this.preChess.x>4){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y);
   }
   if(!this.inArray(this.preChess.x+1,this.preChess.y)&&this.preChess.x<6){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y);
   }
   break;
   case "将":
   if(!this.inArray(this.preChess.x,this.preChess.y-1)&&this.preChess.y>1){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y-1);
   }
   if(!this.inArray(this.preChess.x,this.preChess.y+1)&&this.preChess.y<3){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y+1);
   }
   if(!this.inArray(this.preChess.x-1,this.preChess.y)&&this.preChess.x>4){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y);
   }
   if(!this.inArray(this.preChess.x+1,this.preChess.y)&&this.preChess.x<6){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y);
   }
   break;
   case "兵":
   if(this.preChess.y>5&&!this.inArray(this.preChess.x,this.preChess.y-1)){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y-1);
   }else if(this.preChess.y<=5){
    if(!this.inArray(this.preChess.x,this.preChess.y-1)&&this.preChess.y>1){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y-1);
    }
    if(!this.inArray(this.preChess.x-1,this.preChess.y)&&this.preChess.x>1){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y);
    }
    if(!this.inArray(this.preChess.x+1,this.preChess.y)&&this.preChess.x<9){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y);
    }
   }
   break;
   case "卒":
   if(this.preChess.y<=5&&!this.inArray(this.preChess.x,this.preChess.y+1)){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y+1);
   }else if(this.preChess.y>5){
    if(!this.inArray(this.preChess.x,this.preChess.y+1)&&this.preChess.y<10){
    this.drawCandidateCircle(this.preChess.x,this.preChess.y+1);
    }
    if(!this.inArray(this.preChess.x-1,this.preChess.y)&&this.preChess.x>1){
    this.drawCandidateCircle(this.preChess.x-1,this.preChess.y);
    }
    if(!this.inArray(this.preChess.x+1,this.preChess.y)&&this.preChess.x<9){
    this.drawCandidateCircle(this.preChess.x+1,this.preChess.y);
    }
   }
   break;
   case "炮":
   var temp_y = this.preChess.y;
   while(!this.inArray(this.preChess.x,++temp_y)&&temp_y<=10){
    this.drawCandidateCircle(this.preChess.x,temp_y);
   }
   var temp_y = this.preChess.y;
   while(!this.inArray(this.preChess.x,--temp_y)&&temp_y>0){
    this.drawCandidateCircle(this.preChess.x,temp_y);
   }
   var temp_x = this.preChess.x;
   while(!this.inArray(++temp_x,this.preChess.y)&&temp_x<10){
    this.drawCandidateCircle(temp_x,this.preChess.y);
   }
   var temp_x = this.preChess.x;
   while(!this.inArray(--temp_x,this.preChess.y)&&temp_x>0){
    this.drawCandidateCircle(temp_x,this.preChess.y);
   }
   break;
  }
  }
  // 画候选形状
  obj.drawCandidateCircle = function(x,y){
  this.ctx.beginPath();
  this.ctx.fillStyle ="#eee";
  this.ctx.strokeStyle = "#000";
  this.ctx.lineWidth =2;
       this.ctx.arc(x*this.chunk, y*this.chunk, this.CandidateCircleR, 0, Math.PI * 2, true);

//  this.ctx.translate(x*this.chunk,y*this.chunk);
//  this.ctx.rotate(45*Math.PI/180);
//  this.ctx.translate(1*this.chunk,1*this.chunk);//设置画布上的(0,0)位置，也就是旋转的中心点
//   this.ctx.rotate(1*Math.PI/180);
//       this.ctx.fillRect(x*this.chunk-5,y*this.chunk-5,10,10);

       this.ctx.closePath();
       this.ctx.fill();
       this.ctx.stroke();
  }
  // 棋子移动规则
  obj.Move_rule = function(i,j){
  switch(this.preChess.text){
   case "?":
   return this.rule_Car(i,j);
   case "?":
   return this.rule_Horse(i,j); 
   case "相":
   return this.rule_Elephant_r(i,j);
   case "象":
   return this.rule_Elephant_b(i,j);
   case "仕":
   return this.rule_Scholar_r(i,j);
   case "士":
   return this.rule_Scholar_b(i,j);
   case "帅":
   return this.rule_Boss_r(i,j);
   case "将":
   return this.rule_Boss_b(i,j);
   case "兵":
   return this.rule_Soldier_r(i,j);
   case "卒":
   return this.rule_Soldier_b(i,j);
   case "炮":
   if(this.rule_Cannon(i,j)==0){
    return true;
   }
   return false;
  }
  }
  // 棋子吃子规则
  obj.Eat_rule = function(i,j){
  switch(this.preChess.text){
   case "?":
   return this.rule_Car(i,j);
   case "?":
   return this.rule_Horse(i,j); 
   case "相":
   return this.rule_Elephant_r(i,j);
   case "象":
   return this.rule_Elephant_b(i,j);
   case "仕":
   return this.rule_Scholar_r(i,j);
   case "士":
   return this.rule_Scholar_b(i,j);
   case "帅":
   return this.rule_Boss_r(i,j);
   case "将":
   return this.rule_Boss_b(i,j);
   case "兵":
   return this.rule_Soldier_r(i,j);
   case "卒":
   return this.rule_Soldier_b(i,j);
   case "炮":
   if(this.rule_Cannon(i,j)==1){
    return true;
   }
   return false;
  }
  }
  // ?的规则
  obj.rule_Car = function(i,j){
  if(this.preChess.x ==i||this.preChess.y==j){
   if(this.preChess.x ==i){
   if(this.preChess.y<j){
//    console.log("下");
    var hasObstacle = false;
    for(var p = this.preChess.y+1;p<j;p++){
    if(this.inArray(i,p)){
     hasObstacle = true;
     break;
    }
    }
    if(hasObstacle){
    return false;
    }
   }
   if(this.preChess.y>j){
//    console.log("上");
    var hasObstacle = false;
    for(var p = this.preChess.y-1;p>j;p--){
    if(this.inArray(i,p)){
     hasObstacle = true;
     break;
    }
    }
    if(hasObstacle){
    return false;
    }
   }
   }
   if(this.preChess.y ==j){
   if(this.preChess.x <i){
//    console.log("右");
    var hasObstacle = false;
    for(var p = this.preChess.x+1;p<i;p++){
    if(this.inArray(p,j)){
     hasObstacle = true;
     break;
    }
    }
    if(hasObstacle){
    return false;
    }
   }
   if(this.preChess.x >i){
//    console.log("左");
    var hasObstacle = false;
    for(var p = this.preChess.x-1;p>i;p--){
    if(this.inArray(p,j)){
     hasObstacle = true;
     break;
    }
    }
    if(hasObstacle){
    return false;
    }
   }
   }
   return true;
  }
  return false;
  }
  // ?的规则
  obj.rule_Horse = function(i,j){
  var hasObstacle = false;
  var that = this;
  if((Math.abs(this.preChess.x-i)==1&&Math.abs(this.preChess.y-j)==2)
  ||(Math.abs(this.preChess.x-i)==2&&Math.abs(this.preChess.y-j)==1)){
   if(this.preChess.x-i==2){ // 左
   $.each(that.cheer_arr_ALL,function(ii,ee){
    if(ee.x ==that.preChess.x-1&&ee.y==that.preChess.y){
    hasObstacle =true;
    return false;
    }
   });
   if(hasObstacle){
    return false;
   }
   }else if(i-that.preChess.x==2){ // 右
   $.each(that.cheer_arr_ALL,function(ii,ee){
    if(ee.x ==that.preChess.x+1&&ee.y==that.preChess.y){
    hasObstacle =true;
    return false;
    }
   });
   if(hasObstacle){
    return false;
   }
   }else if(that.preChess.y-j==2){ // 上
   $.each(that.cheer_arr_ALL,function(ii,ee){
    if(ee.x ==that.preChess.x&&ee.y==that.preChess.y-1){
    hasObstacle =true;
    return false;
    }
   });
   if(hasObstacle){
    return false;
   }
   }else if(j-that.preChess.y==2){ // 下
   $.each(that.cheer_arr_ALL,function(ii,ee){
    if(ee.x ==that.preChess.x&&ee.y==that.preChess.y+1){
    hasObstacle =true;
    return false;
    }
   });
   if(hasObstacle){
    return false;
   }
   }
   return true;
  }
  return false;
  }
  // 红相的规则
  obj.rule_Elephant_r = function(i,j){
  var hasObstacle = false;
  var that = this;
  if((Math.abs(that.preChess.x-i)==2&&Math.abs(that.preChess.y-j)==2)&&j>=6){
   var vgaX = (that.preChess.x+i)/2;
   var vgaY = (that.preChess.y+j)/2;
   console.log(vgaX);
   $.each(that.cheer_arr_ALL,function(ii,ee){
   if(ee.x ==vgaX&&ee.y==vgaY){
    hasObstacle =true;
    return false;
   }
   });
   if(hasObstacle){
   return false;
   }
   return true;
  }
  return false;
  }
  // 黑象的规则
  obj.rule_Elephant_b = function(i,j){
  var hasObstacle = false;
  var that = this;
  if((Math.abs(that.preChess.x-i)==2&&Math.abs(that.preChess.y-j)==2)&&j<6){
   var vgaX = (that.preChess.x+i)/2;
   var vgaY = (that.preChess.y+j)/2;
//   console.log(vgaX);
   $.each(that.cheer_arr_ALL,function(ii,ee){
   if(ee.x ==vgaX&&ee.y==vgaY){
    hasObstacle =true;
    return false;
   }
   });
   if(hasObstacle){
   return false;
   }
   return true;
  }
  return false;
  }
  // 红仕的规则
  obj.rule_Scholar_r = function(i,j){
  if(this.preChess.x==5&&this.preChess.y==9){
   if(Math.abs(this.preChess.x-i)==1&&Math.abs(this.preChess.y-j)==1){
   return true;
   }
  }else if(i==5&&j==9){
   return true;
  }
  return false;
  }
  // 黑仕的规则
  obj.rule_Scholar_b = function(i,j){
  if(this.preChess.x==5&&this.preChess.y==2){
   if(Math.abs(this.preChess.x-i)==1&&Math.abs(this.preChess.y-j)==1){
   return true;
   }
  }else if(i==5&&j==2){
   return true;
  }
  return false;
  }
  // 帅的规则
  obj.rule_Boss_r = function(i,j){
  if((Math.abs(this.preChess.x-i)==1&&this.preChess.y==j)
  ||(this.preChess.x==i&&Math.abs(this.preChess.y-j)==1)){
   if(i>=4&&i<=6&&j>=8&&j<=10){
   return true;
   }else{
   return false;
   }
  }
  return false;
  }
  // 将的规则
  obj.rule_Boss_b = function(i,j){
  if((Math.abs(this.preChess.x-i)==1&&this.preChess.y==j)
  ||(this.preChess.x==i&&Math.abs(this.preChess.y-j)==1)){
   if(i>=4&&i<=6&&j>=1&&j<=3){
   return true;
   }else{
   return false;
   }
  }
  return false;
  }
  // 兵的规则
  obj.rule_Soldier_r = function(i,j){
  if(this.preChess.y<=5){
   if((this.preChess.x ==i&&this.preChess.y-1==j)||(this.preChess.x-1 ==i&&this.preChess.y==j)||(this.preChess.x+1 ==i&&this.preChess.y==j)){
   return true;
   }
  }else{
   if(this.preChess.x ==i&&this.preChess.y-1==j){
   return true;
   }
  }
  return false;
  }
  // 卒的规则
  obj.rule_Soldier_b = function(i,j){
  if(this.preChess.y>5){
   if((this.preChess.x ==i&&this.preChess.y+1==j)||(this.preChess.x-1 ==i&&this.preChess.y==j)||(this.preChess.x+1 ==i&&this.preChess.y==j)){
   return true;
   }
  }else{
   if(this.preChess.x ==i&&this.preChess.y+1==j){
   return true;
   }
  }
  return false;
  }
  // 炮的规则
  obj.rule_Cannon = function(i,j){
  var that = this;
  if(this.preChess.x ==i||this.preChess.y==j){
   var t =0;
   if(this.preChess.x ==i){
   var temp = this.preChess.y;
   if(temp<j){
    while(++temp!=j){
    $.each(this.cheer_arr_ALL,function(ii,ee){
     if(ee.x ==that.preChess.x&&ee.y==temp){
     t++;
     return false;
     }
    });
    }
    return t;
   }else{
    while(--temp!=j){
    $.each(this.cheer_arr_ALL,function(ii,ee){
     if(ee.x ==that.preChess.x&&ee.y==temp){
     t++;
     return false;
     }
    });
    }
    return t;
   }
   }else{
   var temp = this.preChess.x;
   if(temp<i){
    while(++temp!=i){
    $.each(this.cheer_arr_ALL,function(ii,ee){
     if(ee.x ==temp&&ee.y==that.preChess.y){
     t++;
     return false;
     }
    });
    }
    return t;
   }else{
    while(--temp!=i){
    $.each(this.cheer_arr_ALL,function(ii,ee){
     if(ee.x ==temp&&ee.y==that.preChess.y){
     t++;
     return false;
     }
    });
    }
    return t;
   }
   }
  }
  return 2;
  }
  obj.inArray = function(x,y){
  var hasObstacle = false;
  $.each(this.cheer_arr_ALL,function(ii,ee){
   if(ee.x ==x&&ee.y==y){
   hasObstacle = true;
   return false;
   }
  });
  return hasObstacle;
  }
  obj.init();
//  obj.init({
//  chunk:50, // 格子大小
//  radius:23, // 棋子半径
//  ccr:3   // 候选小圆半径
//  });
 </script>
 </body>
</html>
以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持三水点靠木！
canvas 实现中国象棋
- Author -
backsword
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