HTML5 Canvas学习笔记(6)拼图游戏（数字版）

今天网上发现了一段代码，只有界面，很不错，学习了并完成了逻辑。
效果图：


点击这里试玩http://www.108js.com/article/canvas/6/play.html

欢迎访问博主的网站：http://www.108js.com

代码：
<canvas id="15-puzzle"></canvas>
<div id="msg">请您将上面数字排成<br>
1，2，3, 4<br>
5, 6, 7, 8<br>
9, 10,11,12<br>
13,14,15<br>

</div>
<script>
   window.onload = function() {
    var W = window.innerHeight/2, H = W;
    var canvas = document.getElementById('15-puzzle');
    var ctx = canvas.getContext('2d');
    var frames, time;
    canvas.width = W;
    canvas.height = H;
    var tileWidth = W/4, tileHeight = H/5;
    ctx.font = tileHeight/2 + 'px Helvetica';
    var I1=0;//记录鼠标点击和移动的位置
    var I=0;
    var J1=0;
    var J=0;
    var fillC=false;//用于改变文字的颜色

    var tiles = {//界面对象
      tiles: [[0, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 11], [12, 13, 14, 15]],
      rightTiles: [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12], [13, 14, 15, 0]],
      draw: function() {//绘制自己
       var x = 0, y = 0;
       ctx.strokeStyle = "#FFF";
       var tile, width, height, posX, posY;
       for (var i = 0; i < this.tiles.length; i++) {
       for (var j = 0; j < this.tiles[0].length; j++) {
         tile = this.tiles[i][j];
         if(tile!= 0){
           width = ctx.measureText(tile).width;
           height = tileHeight/2;
           posX = x * tileWidth + (tileWidth - width)/2;
           posY = y * tileHeight + tileHeight - (height/2);
           var fillStyle;
          tile== this.rightTiles[i][j] ? fillStyle = "#0F0": fillStyle = "#FFF";
          ctx.fillStyle = fillStyle;
          ctx.fillText(this.tiles[i][j], posX, posY);
          ctx.beginPath();
          ctx.rect(x * tileWidth, y * tileHeight, tileWidth, tileHeight);
          ctx.stroke();
         }
         x++;
       }
       x = 0;
       y++;
     }
   },
   //打乱二维数组
   randomize: function() {
     var aux = [];
     for (var i = 0; i < this.tiles.length; i++) {
       for (var j = 0; j < this.tiles[0].length; j++) {
          aux.push(this.tiles[i][j]);
       }
      }
      aux = shuffle(aux);
      for (var i = 0; i < this.tiles.length; i++) {
        for (var j = 0; j < this.tiles[0].length; j++) {
          this.tiles[i][j] = aux[j+i*4];
        }
      }
   }
}
   //启动游戏
  function init() {
    tiles.randomize();
    frames = 0, time = 0;
    run();
   }
  
   function run() {
     frames++;
     update();
     draw();
     if(end()) document.getElementById("msg").innerHTML="你成功了!!!!";
     window.requestAnimationFrame(run, canvas);
     }

    //更新
    function update() {
      if(frames % 60 === 0) {
        if(time < 999){
          time++;
         }
      }
    if(inx(I,J)&&tiles.tiles[I][J]!=0){
      if(inx(I-1,J)&&tiles.tiles[I-1][J]==0) swap(I,J,I-1,J);
      if(inx(I+1,J)&&tiles.tiles[I+1][J]==0) swap(I,J,I+1,J);
      if(inx(I,J-1)&&tiles.tiles[I][J-1]==0) swap(I,J,I,J-1);
      if(inx(I,J+1)&&tiles.tiles[I][J+1]==0) swap(I,J,I,J+1);
    }
  }

     //绘制
    function draw() {
       drawBackground();
       tiles.draw();
     }
//画背景
    function drawBackground() {
ctx.fillStyle = "#000";
ctx.fillRect(0, 0, W, H);
ctx.fillStyle = "#AAA";
ctx.fillRect(0, tileHeight * 4, tileWidth*4, tileHeight);
drawRestart();
drawTime();
    }
     //画重新开始按钮
    function drawRestart() {         
        ctx.strokeStyle ="#FFF";
ctx.beginPath();
ctx.rect(0, tileHeight * 4, tileWidth * 2.5, tileHeight);
ctx.stroke();
var text = "RESTART";
var width = ctx.measureText(text).width;
var height = tileHeight/2;
var textX = (tileWidth * 2.5 - width)/2;
var textY = tileHeight * 5 - (height/2);
        ctx.fillStyle =fillC? "#FF0":"#FFF";
ctx.fillText(text, textX, textY);
     }

     //画游戏计时
     function drawTime() {
ctx.strokeStyle = "#FFF";
ctx.beginPath();
ctx.rect(tileWidth * 2.5, tileHeight * 4, tileWidth * 1.5, tileHeight);
ctx.stroke();
var width = ctx.measureText(time).width;
var height = tileHeight/2;
var textX = tileWidth * 2.5 + (tileWidth * 1.5 - width)/2;
var textY = tileHeight * 5 - (height/2);
ctx.fillStyle = "#000";
ctx.fillText(time, textX, textY);
      }

     init();
     function shuffle(array) {//打乱一个一维数组
       array.sort(function(){ return 0.5 - Math.random() })
       return array;
     }
      //鼠标点击http://www.108js.com
     canvas.onclick =function(e) {
              var e = window.event || e;
              var rect = this.getBoundingClientRect();
              var mouseX =e.clientX - rect.left;//获取鼠标在canvsa中的坐标
              var mouseY =e.clientY - rect.top;
               J=Math.floor(mouseX/tileWidth);
               I=Math.floor(mouseY/tileHeight);
               if(I==4&J<3) init();
           }
       //鼠标移动
       canvas.onmousemove = function(e){
               var e = window.event || e;//
               var rect = this.getBoundingClientRect();
               var mouseX =e.clientX - rect.left;//获取鼠标在canvsa中的坐标
               var mouseY =e.clientY - rect.top;
                J1=Math.floor(mouseX/tileWidth);
                I1=Math.floor(mouseY/tileHeight);
             
                if(I1==4&J1<3) fillC=true;//改变重新开始按钮的颜色
                else fillC=false;

           }
         //鼠标移动,要改变文字颜色http://www.108js.com
           canvas.onmouseout = function(){
            fillC=false;
           }

         //交换二维数组两个位置的值
          function swap(a,b,x,y){
            var temp=tiles.tiles[a][b];
            tiles.tiles[a][b]=tiles.tiles[x][y];
            tiles.tiles[x][y]=temp;
          }

        //是否出边界
      function inx(x,y){
        if(0<=x&&x<tiles.tiles.length&&0<=y&&y<tiles.tiles[0].length) return true;
             return false;
          }

       //是否完成游戏
          function end(){
           for(var m=0;m<tiles.tiles.length;m++){
               for(var n=0;n<tiles.tiles[0].length;n++){
                  if(tiles.tiles[m][n]!=tiles.rightTiles[m][n]) return false;
               }
            }
           return true;
          }
}
</script>
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