已知圆心坐标和圆半径，如何得到圆边所有的点的坐标？

JScript code
r = 100;//半径
o = [x,y]//圆心
for(i=0;i<360;i++){//调整i的步长来求div的分布点坐标
   angle = Math.PI / 180 * i;
   x1[i]=o[0]+r*Math.sin(angle)
   y1[i]=o[1]+r*Math.con(angle)
}

解决方案 »

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其实我是想改随机排列的<!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=gb2312" />
<title>无标题文档</title>
<style type="text/css">
div
{
    width:100px;
    height:100px;
    border: 1px dotted red;
    position:absolute;
    overflow:auto;
}
</style></head>
<body>
   <div>1</div>
   <div>2</div>
   <div>3</div>
   <div>4</div>
   <div>5</div>
</body>
<script type="text/javascript">
/*
var x = Math.ceil(1024/2);
var y = Math.ceil(768/2);
r = 100;//半径
o = [x,y]//圆心
for(i=0;i<360;i++){//调整i的步长来求div的分布点坐标
   angle = Math.PI / 180 * i;
   x1[i]=o[0]+r*Math.sin(angle)
   y1[i]=o[1]+r*Math.cos(angle)
}
*/
var x = Math.ceil(1024/2);
var y = Math.ceil(768/2);var r = 100;//半径
var o = [x,y]//圆心var oPosition = new Object();
oPosition.x = 0;
oPosition.y = 0;var obj_divs=document.getElementsByTagName("div");var angle = Math.PI / 180 * 360*Math.random();//随机角度for(var i=0; i<obj_divs.length; i++)
{
for(var k=0; k<=5; k++)
oPosition.x = o[0]+r*Math.sin(angle);
oPosition.y = o[1]+r*Math.cos(angle); obj_divs[i].style.left = oPosition.x + "px";
obj_divs[i].style.top = oPosition.y + "px";
}//------------------------------------//
function isInteractOnEachOther(oPos)
{
  var bIsInteract = false;

  for (var i=0; i<aX.length; i++)
  {
   if ( ((oPos.x>(aX[i]-iDivWidth))&&(oPos.x<(aX[i]+iDivWidth)))
    && ((oPos.y>(aY[i]-iDivHeight))&&(oPos.y<(aY[i]+iDivHeight))) )
   {
    bIsInteract = true;
    break;
   }
  }

  if (!bIsInteract)
  {
   aX[aX.length] = oPos.x;
   aY[aY.length] = oPos.y;
  }

  return bIsInteract;
}

}
</script>
</html>
结果不成功
angle = Math.PI / 180 * i;都是同一角度，放置的DIV都堆到了一起，好像不行啊
<body>
</body><script>
r = 100;//半径
o = [200,200]//圆心
x1=[]
y1=[]
for(i=0;i<360;i++){//调整i的步长来求div的分布点坐标
   angle = Math.PI / 180 * i;
   x1[i]=o[0]+r*Math.sin(angle)
   y1[i]=o[1]+r*Math.cos(angle)
   div = document.createElement("div")
   div.style.top = y1[i]+"px"
   div.style.left = x1[i]+"px"
   div.style.width = "100px";
   div.style.height = "100px";
   div.style.position = "absolute";
   div.style.border = "1px solid #EEE";
   div.style.background = "#CCC";
   document.body.appendChild(div);
}for(i=0;i<360;i+=30){//调整i的步长来求div的分布点坐标
   angle = Math.PI / 180 * i;
   x1[i]=o[0]+400+r*Math.sin(angle)
   y1[i]=o[1]+r*Math.cos(angle)
   div = document.createElement("div")
   div.style.top = y1[i]+"px"
   div.style.left = x1[i]+"px"
   div.style.width = "100px";
   div.style.height = "100px";
   div.style.position = "absolute";
   div.style.border = "1px solid #EEE";
   div.style.background = "#CCC";
   document.body.appendChild(div);
}
</script>
<body>
</body><script>
r = 100;//半径
o = [200,150]//圆心
x1=[]
y1=[]
for(i=0;i<360;i++){//调整i的步长来求div的分布点坐标
   angle = Math.PI / 180 * i;
   x1[i]=o[0]+r*Math.sin(angle)
   y1[i]=o[1]+r*Math.cos(angle)
   div = document.createElement("div")
   div.style.top = y1[i]+"px"
   div.style.left = x1[i]+"px"
   div.style.width = "100px";
   div.style.height = "100px";
   div.style.position = "absolute";
   div.style.border = "1px solid #EEE";
   div.style.background = "#CCC";
   document.body.appendChild(div);
}for(i=0;i<360;i+=30){//调整i的步长来求div的分布点坐标
   angle = Math.PI / 180 * i;
   x1[i]=o[0]+400+r*Math.sin(angle)
   y1[i]=o[1]+r*Math.cos(angle)
   div = document.createElement("div")
   div.style.top = y1[i]+"px"
   div.style.left = x1[i]+"px"
   div.style.width = "100px";
   div.style.height = "100px";
   div.style.position = "absolute";
   div.style.border = "1px solid #EEE";
   div.style.background = "#CCC";
   document.body.appendChild(div);
}
for(i=0;i<10;i++){//调整i的步长来求div的分布点坐标
   angle = (Math.PI / 180 )* 360*Math.random();
   x1[i]=o[0]+r*Math.sin(angle)
   y1[i]=o[1]+300+r*Math.cos(angle)
   div = document.createElement("div")
   div.style.top = y1[i]+"px"
   div.style.left = x1[i]+"px"
   div.style.width = "50px";
   div.style.height = "50px";
   div.style.position = "absolute";
   div.style.border = "1px solid #EEE";
   div.style.background = "#CCC";
   document.body.appendChild(div);
}
</script>
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