canvas 模仿highcharts自制饼图插件

    <script type=‘text/javascript‘ src="jquery.min.js"></script>
    <script type=‘text/javascript‘ src="pie.js"></script>

<div id="myDiv" style="width:400px;height: 400px; position:absolute"></div>

$("#myDiv").pie({
            data:[18,29,78,24,19,21,39]
        });

(function($){
    $.fn.extend({
        pie:function(options){
            var pie=new pieEffect(this,options);
            canvas.addEventListener("mousemove",function(e){
             var pp = getEventPosition(e);
             pie.drew(pp);           
           },false);
               canvas.addEventListener("click",function(e){
            var pp = getEventPosition(e);
            pie.drew(pp,true);     
           
          },false);
        }
        
    })
    var myDiv=document.createElement("div");
    var clickDiv=document.createElement("div");
    var canvas=document.createElement("canvas");
    var ctx=canvas.getContext("2d");
    var ctop=0,cleft=0;
    var defaults={
        color:["#6A5ACD","#4682B4","#EEB4B4","#FAEBD7","#4EEE94","#63B8FF","#8B658B","#76EEC6","#97FFFF","#BBFFFF","#D1EEEE"],
        data:["5","8","29","15","20","40"],
        angel:[],
        sum:0
    }
         
    canvas.addEventListener("mouseleave",function(e){
         myDiv.style.display="none";
        // clickDiv.style.display="none";
        },false);
    canvas.addEventListener("mouseout",function(e){
         myDiv.style.display="none";
        // clickDiv.style.display="none";
        },false);
    var pieEffect=function(ele,options){
        if(options==null||typeof(options)=="undefined")
             options={};
        this.paintDiv();
        canvas.width=ele[0].clientWidth;
        canvas.height=ele[0].clientHeight;
        ele[0].appendChild(canvas)
        ctop=ele[0].offsetTop;
        cleft=ele[0].offsetLeft;
        defaults=$.extend({},defaults,options)
        this.getSum();
        this.drew();

    }
    pieEffect.prototype={
        getSum:function(){
                for(var i=0;i<defaults.data.length;i++){
                 defaults.sum+=parseInt(defaults.data[i]);    
               }
     
        },
        paintDiv:function(){    
            myDiv.style.height=80+"px";
            myDiv.style.width=100+"px";
            myDiv.style.display="none";
            myDiv.style.backgroundColor="#F0FFF0"
            myDiv.style.borderRadius ="5px"
            myDiv.style.opacity="0.8"
            myDiv.style.float="left";
            myDiv.style.position="absolute";
            myDiv.style.border="1px solid #3d8cdb";
            document.body.appendChild(myDiv);
            clickDiv.style.height=180+"px";
            clickDiv.style.width=220+"px";
            clickDiv.style.display="none";
            clickDiv.style.backgroundColor="#F0FFF0"
            clickDiv.style.borderRadius ="5px"
            clickDiv.style.opacity="0.8"
            clickDiv.style.float="left";
            clickDiv.style.position="absolute";
            clickDiv.style.border="1px solid #3d8cdb";
            var a= document.createElement("a");
            a.style.color="blue";
        //    a.style.marginLeft="200px";
            $(a).attr("href","javascript:void(0)");
            $(a).css("position","absolute").css("top","0").css("right","0")
            a.innerText="关闭";
            $(a).attr(‘title‘,"关闭");
            $(a).attr(‘onclick‘,"$(this).parent().css(‘display‘,‘none‘)");
            
            var title=document.createElement("div");
            $(title).css("background-color","#DCDCDC");
            $(title).css("position","absolute").css("top","0").css("width","220px").css("height","20px");
            title.innerText="我的自定义窗口";
            title.style.opacity="0.6";
            clickDiv.appendChild(title);
            clickDiv.appendChild(a);
            var cdiv=document.createElement("div");
            clickDiv.appendChild(cdiv);
            document.body.appendChild(clickDiv);
            
        
        },
        drew:function(p,flag){
            var begin=end=0;
           for(var i=0;i<defaults.data.length;i++){
            //画一个半角
             ctx.beginPath();
             if(i>5){
                 defaults.color.push(bgColor())    
             }
             ctx.fillStyle=defaults.color[i];
             ctx.strokeStyle="#FFFFFF";
             ctx.moveTo(200,200);
             defaults.angel.push((parseFloat(defaults.data[i])/defaults.sum)*Math.PI*2)     
             begin=end;
             end=defaults.angel[i]+begin;
             ctx.arc(200,200,120,begin,end,false);
             ctx.lineTo(200,200);
             ctx.stroke();
             ctx.fill();
             if(p && ctx.isPointInPath(p.x, p.y)){
          //如果传入了事件坐标，就用isPointInPath判断一下
            //如果当前环境覆盖了该坐标，就将当前环境的index值放到数组里
           //  $("#myDiv").css("left",p.x+left);
           //  $("#myDiv").css("top",p.y+top);
           //  $("#myDiv").css("display","block");
                var mLeft=cleft+p.x;
                var mTop=ctop+p.y;
               //点击事件
              if(flag){
                  
                  clickDiv.style.marginLeft=mLeft-100+"px";
               clickDiv.style.marginTop=mTop-100+"px";
               clickDiv.style.display="block";
               clickDiv.style.position="absolute";
               clickDiv.style.border="1px solid "+defaults.color[i];
               clickDiv.childNodes[2].innerHTML="<br>当前数值:<br>"+defaults.data[i]+"<br>颜色:<br>"+defaults.color[i];
               
                }
                else{
               
                myDiv.style.height=80+"px";
                myDiv.style.width=100+"px";
                myDiv.style.marginLeft=mLeft+"px";
                myDiv.style.marginTop=mTop+"px";
                myDiv.style.display="block";
                myDiv.style.position="absolute";
                myDiv.style.border="1px solid "+defaults.color[i];
                myDiv.innerHTML="数值:<br>"+defaults.data[i]+"<br>颜色:<br>"+defaults.color[i];
                }
             }
            ctx.closePath();
         }            
        }        
    }
    function closeDiv(){
         clickDiv.style.display="none";    
    }
    function bgColor(){
             return  ‘#‘+(‘00000‘+(Math.random()*0x1000000<<0).toString(16)).substr(-6); 
         }

     function bgColor2(){
             var r=Math.floor(Math.random()*256);
             var g=Math.floor(Math.random()*256);
             var b=Math.floor(Math.random()*256);
             return "rgb("+r+‘,‘+g+‘,‘+b+")";//所有方法的拼接都可以用ES6新特性`其他字符串{$变量名}`替换
         }
    function getEventPosition(ev){
    var x, y;
    if (ev.layerX || ev.layerX == 0) {
    x = ev.layerX;
    y = ev.layerY;
    } else if (ev.offsetX || ev.offsetX == 0) { // Opera
    x = ev.offsetX;
    y = ev.offsetY;
    }
  return {x: x, y: y};
}
})(jQuery)