HTML5 Canvas 精灵表动画实例

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HTML5 动画游戏

html html5 JavaScript

两张精灵表图片：

这里可以看效果：
http://www.108js.com/article/article3/view/30161/an.html

<!DOCTYPE html> 
  <html> 
    <head> 
     <meta charset="gbk">
     <title>精灵表动画实例</title>            
     <style type="text/css"> 
       #draw-target {
        width:480px;
        height:320px;
        background-color:#ccf;
        position:relative;
        border:1px solid;
       }
      </style> 
     <script type="text/javascript"> 
 	 
    function CanvasSprite(params) {
       this.x=params.x;//精灵在画布中的x坐标
       this.y=params.y;
       this.index=params.index;//精灵图片的索引，从左到右，从0开始
       this.ctx = params.ctx;//画布的上下文，绘图的地方
       this.width = params.width;//精灵图片的宽
       this.height = params.height;
       this.imagesWidth = params.imagesWidth;//精灵表的宽
       //精灵在精灵表中的位置
       this.vOffset = Math.floor(this.index*this.width / this.imagesWidth) * this.height;
       this.hOffset = (this.index*this.width) % this.imagesWidth;

       this.hide = false;
       this.img = new Image();
       this.img.src = params.images;//精灵表图片
       this.act=params.act;//精灵的动作行为
     }
     //在画布中绘制精灵
     CanvasSprite.prototype.draw=function() {
        if (this.hide) {
            return;
        }
        this.ctx.drawImage(this.img, this.hOffset, this.vOffset, this.width, this.height,this.x , this.y, this.width, this.height);
     }
     
      //改变精灵的索引
    CanvasSprite.prototype.changeImage=function(index) {
        this.index =index;
            this.vOffset = Math.floor(this.index*this.width / this.imagesWidth) * this.height;
            this.hOffset = (this.index*this.width) % this.imagesWidth;
     }
      CanvasSprite.prototype.show=function() {
            this.hide = false;
        }
        
       CanvasSprite.prototype.hide=function() {
            this.hide = true;
        }
  
        CanvasSprite.prototype.destroy=function () {
            return;
        }
  
       //精灵的行为，交给实现了ac（）方法的对象
      CanvasSprite.prototype.move= function(drawTarget) {  
         this.act.ac(this,drawTarget); 
       }
        //精灵1的动作
       function action(){
        this.ac=function(canvasSprite,drawTarget){
          var maxX=drawTarget.width - 64;
          var maxY= drawTarget.height - 64;  
          canvasSprite.x += 2;
          canvasSprite.y += 2; 
          canvasSprite.index++;
          if(canvasSprite.index>=5) canvasSprite.index=0;
          if(canvasSprite.x>maxX) canvasSprite.x-=2;
          if(canvasSprite.y>maxY) canvasSprite.y-=2;
          canvasSprite.changeImage(canvasSprite.index);
       }
     }
    //精灵2的动作
    function action1(){
        this.ac=function(canvasSprite,drawTarget){
          canvasSprite.index++;
          if(canvasSprite.index>=4) canvasSprite.index=0;
          canvasSprite.changeImage(canvasSprite.index);
       }
     }

   
   window.onload=function() {
     var canvas = document.getElementById('draw-target');
     var ctx=canvas.getContext("2d");
     var drawTarget=document.getElementById("draw-target");

     //精灵1的参数
     var para={
           x:0,
           y:0,
           index:0,
           images: 'cogs.png',
           imagesWidth: 256,
           width: 64,
           height: 64,
           ctx:ctx,
          act:new action()
      }
       //精灵2的参数
      var para1={
           x:200,
           y:0,
           index:0,
           images: 'ren.png',
           imagesWidth: 240,
           width: 60,
           height: 60,
           ctx:ctx,
           act:new action1()
      }

     var sprite1=new CanvasSprite(para);
     var sprite2=new CanvasSprite(para1);
   
    
      function moveAll() {	
       ctx.clearRect(0,0,ctx.canvas.width,ctx.canvas.height);
       sprite2.move(drawTarget);
       sprite1.move(drawTarget);	
       sprite2.draw();
       sprite1.draw();
       setTimeout(moveAll, 50);
      }
    moveAll(); 
    
   }
   </script> 
        </head>              
        <body> 
         精灵动画.
 
         <canvas id="draw-target" width = 480 height = 320> 浏览器不支持HTML5
         </canvas>           
			
        </body>    
    </html>

下载源代码：http://www.108js.com/article/article3/30161.html