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D3.js是一個JavaScript庫，它可以通過數據來操作文檔。D3可以通過使用HTML、SVG和CSS把數據鮮活形象地展現出來。D3嚴格遵循Web標準，因而可以讓你的程序輕松兼容現代主流瀏覽器并避免對特定框架的依賴。同時，它提供了強大的可視化組件，可以讓使用者以數據驅動的方式去操作DOM。（來自：維基百科D3.js詞條）

!function(){

var Donut3D={};

function pieTop(d, rx, ry, ir ){

if(d.endAngle - d.startAngle == 0 ) return "M 0 0";

var sx = rx*Math.cos(d.startAngle),

sy = ry*Math.sin(d.startAngle),

ex = rx*Math.cos(d.endAngle),

ey = ry*Math.sin(d.endAngle);

var ret =[];

ret.push("M",sx,sy,"A",rx,ry,"0",(d.endAngle-d.startAngle > Math.PI? 1: 0),"1",ex,ey,"L",ir*ex,ir*ey);

ret.push("A",ir*rx,ir*ry,"0",(d.endAngle-d.startAngle > Math.PI? 1: 0), "0",ir*sx,ir*sy,"z");

return ret.join(" ");

}

function pieOuter(d, rx, ry, h ){

var startAngle = (d.startAngle > Math.PI ? Math.PI : d.startAngle);

var endAngle = (d.endAngle > Math.PI ? Math.PI : d.endAngle);

var sx = rx*Math.cos(startAngle),

sy = ry*Math.sin(startAngle),

ex = rx*Math.cos(endAngle),

ey = ry*Math.sin(endAngle);

var ret =[];

ret.push("M",sx,h+sy,"A",rx,ry,"0 0 1",ex,h+ey,"L",ex,ey,"A",rx,ry,"0 0 0",sx,sy,"z");

return ret.join(" ");

}

function pieInner(d, rx, ry, h, ir ){

var startAngle = (d.startAngle < Math.PI ? Math.PI : d.startAngle);

var endAngle = (d.endAngle < Math.PI ? Math.PI : d.endAngle);

var sx = ir*rx*Math.cos(startAngle),

sy = ir*ry*Math.sin(startAngle),

ex = ir*rx*Math.cos(endAngle),

ey = ir*ry*Math.sin(endAngle);

var ret =[];

ret.push("M",sx, sy,"A",ir*rx,ir*ry,"0 0 1",ex,ey, "L",ex,h+ey,"A",ir*rx, ir*ry,"0 0 0",sx,h+sy,"z");

return ret.join(" ");

}

function getPercent(d){

return (d.endAngle-d.startAngle > 0.2 ?

Math.round(1000*(d.endAngle-d.startAngle)/(Math.PI*2))/10+'%' : '');

}

Donut3D.transition = function(id, data, rx, ry, h, ir){

function arcTweenInner(a) {

  var i = d3.interpolate(this._current, a);

  this._current = i(0);

  return function(t) { return pieInner(i(t), rx+0.5, ry+0.5, h, ir);  };

}

function arcTweenTop(a) {

  var i = d3.interpolate(this._current, a);

  this._current = i(0);

  return function(t) { return pieTop(i(t), rx, ry, ir);  };

}

function arcTweenOuter(a) {

  var i = d3.interpolate(this._current, a);

  this._current = i(0);

  return function(t) { return pieOuter(i(t), rx-.5, ry-.5, h);  };

}

function textTweenX(a) {

  var i = d3.interpolate(this._current, a);

  this._current = i(0);

  return function(t) { return 0.6*rx*Math.cos(0.5*(i(t).startAngle+i(t).endAngle));  };

}

function textTweenY(a) {

  var i = d3.interpolate(this._current, a);

  this._current = i(0);

  return function(t) { return 0.6*rx*Math.sin(0.5*(i(t).startAngle+i(t).endAngle));  };

}

var _data = d3.layout.pie().sort(null).value(function(d) {return d.value;})(data);

d3.select("#"+id).selectAll(".innerSlice").data(_data)

.transition().duration(750).attrTween("d", arcTweenInner);

d3.select("#"+id).selectAll(".topSlice").data(_data)

.transition().duration(750).attrTween("d", arcTweenTop);

d3.select("#"+id).selectAll(".outerSlice").data(_data)

.transition().duration(750).attrTween("d", arcTweenOuter);

d3.select("#"+id).selectAll(".percent").data(_data).transition().duration(750)

.attrTween("x",textTweenX).attrTween("y",textTweenY).text(getPercent);

}

Donut3D.draw=function(id, data, x /*center x*/, y/*center y*/,

rx/*radius x*/, ry/*radius y*/, h/*height*/, ir/*inner radius*/){

var _data = d3.layout.pie().sort(null).value(function(d) {return d.value;})(data);

var slices = d3.select("#"+id).append("g").attr("transform", "translate(" + x + "," + y + ")")

.attr("class", "slices");

slices.selectAll(".innerSlice").data(_data).enter().append("path").attr("class", "innerSlice")

.style("fill", function(d) { return d3.hsl(d.data.color).darker(0.7); })

.attr("d",function(d){ return pieInner(d, rx+0.5,ry+0.5, h, ir);})

.each(function(d){this._current=d;});

slices.selectAll(".topSlice").data(_data).enter().append("path").attr("class", "topSlice")

.style("fill", function(d) { return d.data.color; })

.style("stroke", function(d) { return d.data.color; })

.attr("d",function(d){ return pieTop(d, rx, ry, ir);})

.each(function(d){this._current=d;});

slices.selectAll(".outerSlice").data(_data).enter().append("path").attr("class", "outerSlice")

.style("fill", function(d) { return d3.hsl(d.data.color).darker(0.7); })

.attr("d",function(d){ return pieOuter(d, rx-.5,ry-.5, h);})

.each(function(d){this._current=d;});

slices.selectAll(".percent").data(_data).enter().append("text").attr("class", "percent")

.attr("x",function(d){ return 0.6*rx*Math.cos(0.5*(d.startAngle+d.endAngle));})

.attr("y",function(d){ return 0.6*ry*Math.sin(0.5*(d.startAngle+d.endAngle));})

.text(getPercent).each(function(d){this._current=d;});

}

this.Donut3D = Donut3D;

}();