团队-象棋游戏-开发文档

  1 function Board(ctx, cfg){
  2     this.width = cfg.width;
  3     this.height = cfg.height;
  4     this.margin = cfg.margin ? cfg.margin : 0;
  5     this.space = (this.width-2*this.margin)/8;
  6     this.array = [[],[],[],[],[],[],[],[],[],[]];
  7     this.step = 0;
  8     this.steps = [];
  9     this.init(ctx)
 10 }
 11 Board.prototype.init = function(ctx){
 12     var ctx = canvas.getContext("2d");
 13     var i, j, x;
 14     //象棋位置数组
 15     var xiangqi = [
 16         [Rook, Knight, Elephant, Mandarin, King],
 17         [0, 0, 0, 0, 0],
 18         [0, Cannon, 0, 0, 0],
 19         [Pawn, 0, Pawn, 0, Pawn],
 20         [0, 0, 0, 0, 0],
 21         [0, 0, 0, 0, 0],
 22         [Pawn, 0, Pawn, 0, Pawn],
 23         [0, Cannon, 0, 0, 0],
 24         [0, 0, 0, 0, 0],
 25         [Rook, Knight, Elephant, Mandarin, King]
 26     ];
 27     for(i=0; i<9; i++){
 28         x = i>4 ? (i-(i-4)*2) : i;
 29         for(j=0; j<10; j++){
 30             this.array[i][j] = {};
 31             this.array[i][j].point = {
 32                 x:this.margin+this.space*i,
 33                 y:this.margin+this.space*j
 34             };
 35             this.array[i][j].xiangqi =  xiangqi[j][x] != 0 ? new xiangqi[j][x](j > 4 ? 0 : 1) : 0;
 36         }
 37     }
 38     //画棋盘
 39     this.draw(ctx);
 40     //落子
 41     this.locate(ctx);
 42     //事件
 43     this.initEvents(canvas);
 44     this.current = false;
 45 }
 46 Board.prototype.draw = function(ctx){
 47     var i;
 48     ctx.beginPath();
 49     ctx.strokeStyle = "rgb(0, 0, 0)";
 50     //frame
 51     ctx.moveTo(0, 0);
 52     ctx.lineTo(this.width, 0);
 53     ctx.lineTo(this.width, this.height);
 54     ctx.lineTo(0, this.height);
 55     ctx.lineTo(0, 0);
 56     ctx.stroke();
 57     //horizontal lines
 58     for(i=0; i<10; i++){
 59         ctx.moveTo(this.margin, (i*this.space)+this.margin);
 60         ctx.lineTo(this.margin+this.space*8, (i*this.space)+this.margin);
 61     }
 62     //vertical lines
 63     for(i=0; i<9; i++){
 64         ctx.moveTo((i*this.space)+this.margin, this.margin);
 65         ctx.lineTo((i*this.space)+this.margin, this.margin+this.space*4);
 66         ctx.moveTo((i*this.space)+this.margin, this.margin+this.space*5);
 67         ctx.lineTo((i*this.space)+this.margin, this.margin+this.space*9);
 68     }
 69     ctx.stroke();
 70 
 71     //the path of mandarins
 72     ctx.moveTo(this.margin+3*this.space, this.margin);
 73     ctx.lineTo(this.margin+5*this.space, this.margin+2*this.space);
 74     ctx.moveTo(this.margin+3*this.space, this.margin+7*this.space);
 75     ctx.lineTo(this.margin+5*this.space, this.margin+9*this.space);
 76     ctx.moveTo(this.margin+5*this.space, this.margin);
 77     ctx.lineTo(this.margin+3*this.space, this.margin+2*this.space);
 78     ctx.moveTo(this.margin+5*this.space, this.margin+7*this.space);
 79     ctx.lineTo(this.margin+3*this.space, this.margin+9*this.space);
 80     ctx.stroke();
 81     var drawMark = function(x, y, left, right){
 82         if(right){
 83             //bottom right
 84             ctx.moveTo(x+this.space/9+this.space/3, y+this.space/9);
 85             ctx.lineTo(x+this.space/9, y+this.space/9);
 86             ctx.lineTo(x+this.space/9, y+this.space/9+this.space/3);
 87             //top right
 88             ctx.moveTo(x+this.space/9+this.space/3, y-this.space/9);
 89             ctx.lineTo(x+this.space/9, y-this.space/9);
 90             ctx.lineTo(x+this.space/9, y-this.space/9-this.space/3);
 91         }
 92         if(left){
 93             //top left
 94             ctx.moveTo(x-this.space/9-this.space/3, y-this.space/9);
 95             ctx.lineTo(x-this.space/9, y-this.space/9);
 96             ctx.lineTo(x-this.space/9, y-this.space/9-this.space/3);
 97             //bottom left
 98             ctx.moveTo(x-this.space/9-this.space/3, y+this.space/9);
 99             ctx.lineTo(x-this.space/9, y+this.space/9);
100             ctx.lineTo(x-this.space/9, y+this.space/9+this.space/3);
101         }
102     }
103     //paws mark
104     for(i=0; i<10; i++){
105         var y = this.margin + 3*(i%2)*this.space + 3*this.space;
106         var x = this.margin + Math.floor(i/2)*2*this.space;
107         drawMark(x, y, i>1, i<8);
108     }
109     //cannons mark
110     for(i=0; i<2; i++){
111         var x = this.margin + this.space  +(i%2)*6*this.space;
112         var y = this.margin + 2*this.space;
113         drawMark(x, y, true, true);
114         y = this.margin + 7*this.space;
115         drawMark(x, y, true, true);
116     }
117     ctx.stroke();
118     ctx.save();
119     //楚河 汉界
120     ctx.font = this.space*0.9+"px 宋体";
121     ctx.fillStyle = "#000";
122     var wordspace = (8*this.space - this.space*0.9*4)/5;
123     ctx.fillText("楚", this.margin+wordspace, this.margin+this.space*5-0.2*this.space);
124     ctx.fillText("河", this.margin+2*wordspace+this.space*0.9, this.margin+this.space*5-0.2*this.space);
125     ctx.rotate(Math.PI);
126     ctx.fillText("界", -this.margin-3*wordspace-3*+this.space*0.9, -this.margin-this.space*4-0.2*this.space);
127     ctx.fillText("汉", -this.margin-4*wordspace-4*+this.space*0.9, -this.margin-this.space*4-0.2*this.space);
128     ctx.restore();
129     ctx.closePath();
130 }