js画了一个椭圆

时间：2015-03-02 11:03:58 阅读：202 评论：0 收藏：0 [点我收藏+]

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test</title>
<script type="text/javascript">
          /*
     * Draw a Oval
     * The following is the formula of Oval.
     * All dots is drawn by it.
     * x = r*a*cosθ　(0 <= θ <= 2π)
     * y = r*b*sinθ　(0 <= θ <= 2π)
     * b*b + r*r = a*a //Pythagoras Theorem
     */
    var Circle = {
        centre_of_circle : {x:200,y:200},
        radius : 12,
        dot : function(x,y,w){
            return "<div id=‘dot_"+x+y+"‘ style=‘display:none;font-size:0;width:"+w+"px;height:"+w+"px;position:absolute;background-color:#000;top:"+(y)+"px;left:"+(x)+"px‘></div>";
        },
        draw : function(){
            var s = "",
                dots = 500,
                a = 15,
                b = 9,
                dotsArr = [];
            for(var i = 0; i < dots; i++){
                var x = Circle.centre_of_circle.x+Circle.radius*Math.cos(i*2*Math.PI/dots)*a;
                var y = Circle.centre_of_circle.y+Circle.radius*Math.sin(i*2*Math.PI/dots)*b;
                s += Circle.dot(x, y, 2);
                dotsArr.push({"y":y,"x":x});
            }
            document.body.innerHTML = s;
            return dotsArr;
        }
    }
    window.onload = function(){
        var dots = Circle.draw();
        var count = 0;
        var t = window.setInterval(function(){
           document.getElementById("dot_"+dots[count].x+dots[count].y).style.display = "block";
           count++;
           if(count >= dots.length) window.clearInterval(t);
        },1);
    }
</script>
</head>

<body>
</body>
</html>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>test</title>  
<script type="text/javascript">  
    /*   
     * Draw a Oval   
     * The following is the formula of Oval.   
     * All dots is drawn by it.   
     * x = r*a*cosθ　(0 <= θ <= 2π)   
     * y = r*b*sinθ　(0 <= θ <= 2π)   
     * b*b + r*r = a*a //Pythagoras Theorem   
     */   
    var Circle = {   
        centre_of_circle : {x:200,y:200},   
        radius : 12,   
        dot : function(x,y,w){   
            return "<div id=‘dot_"+x+y+"‘ style=‘display:none;font-size:0;width:"+w+"px;height:"+w+"px;position:absolute;background-color:#000;top:"+(y)+"px;left:"+(x)+"px‘></div>";   
        },   
        draw : function(){   
            var dots = 300,   
                a = 15,   
                b = 9,   
                dotsArr = [];   
            for(var i = 0; i < dots; i++){   
                var x = Circle.centre_of_circle.x+Circle.radius*Math.cos(i*2*Math.PI/dots)*a;   
                var y = Circle.centre_of_circle.y+Circle.radius*Math.sin(i*2*Math.PI/dots)*b;   
                dotsArr.push({"y":y,"x":x});   
            }   
            return dotsArr;   
        },
        words : function(aObjArr){
            var s = "";
            s += "<a href=‘"+aObjArr.href+"‘ target=‘_blank‘ style=‘position:absolute;‘ id=‘a_"+aObjArr.id+"‘>"+aObjArr.str+"</a>";
            return s;
        }
    }   
    window.onload = function(){   
        var dots = Circle.draw();   
        var count = 0;  
        document.body.innerHTML = Circle.words({href:"http://www.baidu.com",id:dots[count].x+""+dots[count].y,str:"baidu"});
        var style = document.getElementById("a_"+dots[count].x+""+dots[count].y).style;
        var t = window.setInterval(function(){     
           with(style){
               top = dots[count].y+"px";
               left = dots[count].x+"px";
               fontSize = (dots[count].y/10)+"px"
           }
           count++;   
           if(count >= dots.length){
               count = 0;
           }
        },1);   
    }   
</script>  
</head>  
  
<body>  
</body>  
</html>

js画了一个椭圆

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原文地址：http://www.cnblogs.com/0515offer/p/4307960.html

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