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新建html文档。

书写hmtl代码。

<div id="outerDiv">

 <div id="m0"></div>

 <div id="m1">1</div>

 <div id="m2">2</div>

 <div id="m3">3</div>

 <div id="m4">4</div>

 <div id="m5">5</div>

 <div id="m6">6</div>

 <div id="m7">7</div>

 <div id="m8">8</div>

</div>

初始化css代码。

<style>

* { margin: 0; padding: 0 }

html { overflow-y: scroll }

body, h1, h2, h3, p, div, dl, dt, dd, ul, ol, li, table, th, td, form, button, input, textarea, legend, hr { padding: 0; margin: 0 }

body { padding: 0; margin: 0;  color: #333; font: 12px/18px "微软雅黑", arial; height: 100% }

button, input, select, textarea { font-size: 100% }

textarea { font: 14px/20px "微软雅黑" }

button { border: 0 }

li { list-style: none }

img { border: 0; }

a { color: #06c; text-decoration: none; cursor: pointer; outline: none; hide-focus:expression(this.hideFocus = true);}

a:hover { color: #06c; text-decoration: underline }

.left{ float:left;}

.right{ float:right;}

.clear:after,ul:after{content:"";display:block;visibility:hidden;height:0;clear:both;}

.clear,.area,.con:after{zoom:1}

</style>

书写css代码。

<style>

#outerDiv{background-color: black;width:300px;height:300px;border-radius:150px;position: absolute;}

#m0{background: blue;width: 100px;height: 100px;border-radius: 50px;position: absolute;left:100px;top:100px;}

#m1,#m2,#m3,#m4,#m5,#m6,#m7,#m8{position: absolute;}

#m1,#m3,#m5,#m7{background: yellow;}

#m2,#m3,#m6,#m8{ background: red;}

</style>

书写并添加js代码。

<script src="js/jquery-1.11.0.js"></script>

<script src="js/jquery.rotate.min.js"></script>

<script>

var or = 150;

var ir = 50;

var mWidth = 54;

var mDLen = Math.sqrt(2 * Math.pow(mWidth,2));

//第1菜单块中心点与以o(150,150)为圆心的的X轴的夹角为-90(-PI/2), 求菜单块中心点坐标

var m1X = parseInt( (Math.cos( -1 * Math.PI / 2 ) * (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m1Y = parseInt( (Math.sin( -1 * Math.PI / 2 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m1").width(mWidth);

$("#m1").height(mWidth);

$("#m1").offset( {top:m1Y,left:m1X} );

//第2菜单块中心点与以o(150,150)为圆心的的X轴的夹角为-45(-PI/4), 求菜单块中心点坐标

var m2X = parseInt( (Math.cos( -1 * Math.PI / 4 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m2Y = parseInt( (Math.sin( -1 * Math.PI / 4 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m2").width(mWidth);

$("#m2").height(mWidth);

$("#m2").offset( {top:m2Y,left:m2X} );

//第3菜单块中心点与以o(150,150)为圆心的的X轴的夹角为0(0), 求菜单块中心点坐标

var m3X = parseInt( (Math.cos( 0 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m3Y = parseInt( (Math.sin( 0 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m3").width(mWidth);

$("#m3").height(mWidth);

$("#m3").offset( {top:m3Y,left:m3X} );

//第4菜单块中心点与以o(150,150)为圆心的的X轴的夹角为45(PI/4), 求菜单块中心点坐标

var m4X = parseInt( (Math.cos( Math.PI / 4 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m4Y = parseInt( (Math.sin( Math.PI / 4 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m4").width(mWidth);

$("#m4").height(mWidth);

$("#m4").offset( {top:m4Y,left:m4X} );

//第5菜单块中心点与以o(150,150)为圆心的的X轴的夹角为90(PI/2), 求菜单块中心点坐标

var m5X = parseInt( (Math.cos( Math.PI / 2 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m5Y = parseInt( (Math.sin( Math.PI / 2 ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m5").width(mWidth);

$("#m5").height(mWidth);

$("#m5").offset( {top:m5Y,left:m5X} );

//第6菜单块中心点与以o(150,150)为圆心的的X轴的夹角为135(0.75PI), 求菜单块中心点坐标

var m6X = parseInt( (Math.cos( 0.75 * Math.PI ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m6Y = parseInt( (Math.sin( 0.75 * Math.PI ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m6").width(mWidth);

$("#m6").height(mWidth);

$("#m6").offset( {top:m6Y,left:m6X} );

//第7菜单块中心点与以o(150,150)为圆心的的X轴的夹角为180(PI), 求菜单块中心点坐标

var m7X = parseInt( (Math.cos( Math.PI ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m7Y = parseInt( (Math.sin( Math.PI ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m7").width(mWidth);

$("#m7").height(mWidth);

$("#m7").offset( {top:m7Y,left:m7X} );

//第8菜单块中心点与以o(150,150)为圆心的的X轴的夹角为-135(PI), 求菜单块中心点坐标

var m8X = parseInt( (Math.cos( -0.75 * Math.PI ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

var m8Y = parseInt( (Math.sin( -0.75 * Math.PI ) *  (ir + ((or - ir - mDLen)/2) + mDLen/2) ) + 150 - mWidth/2 );

$("#m8").width(mWidth);

$("#m8").height(mWidth);

$("#m8").offset( {top:m8Y,left:m8X} );

var preX,preY;//上一次鼠标点的坐标

var curX,curY;//本次鼠标点的坐标

var preAngle;//上一次鼠标点与圆心(150,150)的X轴形成的角度(弧度单位)

var transferAngle;//当前鼠标点与上一次preAngle之间变化的角度

var a = 0;

for(var i = 0 ; i < 15 ; i++){

$("body").append("<br>");

}

//点击事件

$("#outerDiv").mousedown(function(event){

preX = event.clientX;

preY = event.clientY;

//计算当前点击的点与圆心(150,150)的X轴的夹角(弧度) --> 上半圆为负(0 ~ -180), 下半圆未正[0 ~ 180]

preAngle = Math.atan2(preY - 150, preX - 150);

//移动事件

$("html").mousemove(function(event){

curX = event.clientX;

curY = event.clientY;

//计算当前点击的点与圆心(150,150)的X轴的夹角(弧度) --> 上半圆为负(0 ~ -180), 下半圆未正[0 ~ 180]

var curAngle = Math.atan2(curY - 150, curX - 150);

transferAngle = curAngle - preAngle;

a += (transferAngle * 180 / Math.PI);

$('#outerDiv').rotate(a);

for( var i = 1 ; i <= 8 ; i++ ){

$("#m"+i).rotate(-a);

}

preX = curX;

preY = curY;

preAngle = curAngle;

});

//释放事件

$("html").mouseup(function(event){

$("html").unbind("mousemove");

});

});

</script>

代码整体结构。

查看效果。