javascript数据曲线图实例代码

数据曲线图效果在一些网站有大量的应用，比如对数据的统计或者说走势的预测之类的，比如说股市的曲线图，或者销售量的曲线图等等，比较直观，并且还能够看得出变化趋势，下面就是一段通过js实现的此效果。

代码实例如下:

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="author" content="http://www.51qianduan.com/" />
<title>51前端</title>
<script type="text/javascript">
var gov=new Object();
var Class={
  create:function(){
    return function(){
      this.initialize.apply(this, arguments);
    }
  }
}
Object.extend=function(destination,source){
  for(var property in source){
    destination[property] = source[property];
  }
  return destination;
}
var $=function(elem){
  if(arguments.length>1){
    for(var i = 0, elems = [], length = arguments.length; i < length; i++)
      elems.push($(arguments[i]));
      return elems;
    }
    if(typeof elem == 'string'){
      return document.getElementById(elem);
    } 
        else{
      return elem;
    }
  };
  var period= Class.create();
  period.prototype={
    initialize:function(value,time){
      this.value = value;      
      this.time = time;
    }
  };
  gov.Graphic = Class.create();
  gov.Graphic.prototype={
    initialize:function(data,elm,options){
      this.setOptions(options);
      this.entity=document.createElement("div");
      this.pointBox=$(elm);
      this.showPointGraphic(data);
    },
    setOptions:function(options){
      this.options={
        height:170,//绘图区域高度
        maxHeight:50,//y轴最高数值
        barDistance:26, //x轴坐标间距
        topDistance:0,//上部填充
        bottomDistance:0,//底部填充
        leftDistance:20,
        pointWidth:5,//坐标点宽度
        pointHeight:5,//坐标点高度
        pointColor:"#ff0000",//坐标点颜色
        lineColor:"#ffd43a",//连接线颜色
        valueWidth:20,//y轴数值宽度
        valueColor:"#000",//y轴数值颜色
        timeWidth:20,//x轴数值宽度
        timeColor:"#000",//x轴数值颜色
        disvalue:true,//是否显示y轴数值
        distime:true//是否显示x轴数值
      }
      Object.extend(this.options, options || {});
    },
    showPointGraphic:function(data,obj)
    {
      var This=this;
      var showPoints=new Array();
      var values=new Array();
      var times=new Array();
      This.points=data;
      This.count=data.value.length;
      for(var i=0;i<This.count;i++)
      {
        var showPoint=document.createElement("div");
        var spanValue=document.createElement("span");
        var spanTime=document.createElement("span");
        showPoint.height=This.points.value[i];
        showPoint.value=This.points.value[i];
        showPoint.time=This.points.time[i];
      
        showPoint.style.backgroundColor=this.options.pointColor;
        showPoint.style.fontSize="0px";
        showPoint.style.position="absolute";
        showPoint.style.zIndex ="999";
        showPoint.style.width=this.options.pointWidth+"px";
        showPoint.style.height=this.options.pointHeight+"px";
        showPoint.style.top=this.options.topDistance+"px";
                  
        spanValue.style.position="absolute";
        spanValue.style.width=this.options.valueWidth+"px";
        spanValue.style.textAlign="center";
        spanValue.style.color=this.options.valueColor;
        spanValue.style.zIndex ="999";
        spanTime.style.position="absolute";
        spanTime.style.width=this.options.timeWidth+"px";
        spanTime.style.textAlign="center";
        spanTime.style.color=this.options.timeColor;
        var timeHeight=15;
        var valueHeight=21;
        if(!this.options.disvalue){
          spanValue.style.display="none";
          valueHeight=this.options.pointHeight;
        }
        if(!this.options.distime){
          spanTime.style.display="none";
          timeHeight=0;
        }
        var left;
        if(showPoints.length!=0){
          left=parseInt(showPoints[showPoints.length-1].style.left)+
                  parseInt(showPoints[showPoints.length-1].style.width)+
                  this.options.barDistance;
        }
        else{
          left=this.options.leftDistance;
        }
      
        showPoint.style.left=left+"px";
        spanValue.style.left=left+parseInt((this.options.pointWidth-this.options.valueWidth)/2)+"px";
        spanTime.style.left=left+parseInt((this.options.pointWidth-this.options.timeWidth)/2)+"px";
              
        if(showPoint.height>this.options.maxHeight)
                {
          showPoint.height=this.options.maxHeight;
        }
      
        spanValue.innerHTML=showPoint.value;
        spanTime.innerHTML=showPoint.time;
                          
        showPoints.push(showPoint);
        values.push(spanValue);
        times.push(spanTime);
        This.entity.appendChild(showPoint);
        This.entity.appendChild(spanValue);
        This.entity.appendChild(spanTime);
      
        var percentage=showPoints[i].height/this.options.maxHeight||0;
        var pointTop=(this.options.height-this.options.topDistance-this.options.bottomDistance-timeHeight-valueHeight)*percentage;
        showPoints[i].style.top=(this.options.height-this.options.bottomDistance-pointTop-timeHeight-this.options.pointHeight)+"px";
        values[i].style.top=(this.options.height-this.options.bottomDistance-pointTop-timeHeight-valueHeight)+"px";
        times[i].style.top=this.options.height-this.options.bottomDistance-timeHeight+"px";
      }
      var _leng=showPoints.length
      for(var i=0;i<_leng;i++)
      {
        if(i>0)
        {
          This.drawLine(parseInt(showPoints[i-1].style.left),
          parseInt(showPoints[i-1].style.top),
          parseInt(showPoints[i].style.left),
          parseInt(showPoints[i].style.top)
        );
      }
    }
    This.Constructor.call(This);
  },
  drawLine:function(startX,startY,endX,endY)
  {
   var xDirection=(endX-startX)/Math.abs(endX-startX);
   var yDirection=(endY-startY)/Math.abs(endY-startY);
   var xDistance=endX-startX;
   var yDistance=endY-startY;
   var xPercentage=1/Math.abs(endX-startX);
   var yPercentage=1/Math.abs(endY-startY);
   if(Math.abs(startX-endX)>=Math.abs(startY-endY))
   {
    var _xnum=Math.abs(xDistance)
    for(var i=0;i<=_xnum;i++)
    {
     var point=document.createElement("div");
     point.style.position="absolute";
     point.style.backgroundColor=this.options.lineColor;
     point.style.fontSize="0";
     point.style.width="1px";
     point.style.height="1px";       
       
     startX+=xDirection;
     point.style.left=startX+this.options.pointWidth/2+"px";
     startY=startY+yDistance*xPercentage;
     point.style.top=startY+this.options.pointHeight/2+"px";
     this.entity.appendChild(point);
    }
   }
   else
   {
    var _ynum=Math.abs(yDistance)
    for(var i=0;i<=_ynum;i++)
    {
     var point=document.createElement("div");
     point.style.position="absolute";
     point.style.backgroundColor=this.options.lineColor;
     point.style.fontSize="0";
     point.style.width="1px";
     point.style.height="1px";       
       
     startY+=yDirection;
     point.style.top=startY+this.options.pointWidth/2+"px";
     startX=startX+xDistance*yPercentage;
     point.style.left=startX+this.options.pointHeight/2+"px";
     this.entity.appendChild(point);
    }
   }
  },
  Constructor:function()
  {
   this.entity.style.position="absolute";
   this.pointBox.innerHTML="";
   this.pointBox.appendChild(this.entity);
  }
}
window.onload=function()
{
  var data=new period([0,10,22,13,34,25,28,26,30,35,28,34,39,28,26,50,35,28,34,39,55],//y轴数据
   [188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208]//x轴数据
  );
  var data1=new period([48,23,10,2,12,8,24,25,15,35,25,14,42,58,46,25,12,8,14,28,42],//y轴数据
   [188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208]//x轴数据
  );
  new gov.Graphic(data,"box");
  new gov.Graphic(data1,"box1",{ pointColor:"#3366ff",lineColor:"#33ffff"});
}
</script>
<style type="text/css">
body,td,th 
{
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  margin:0px;
  padding:0px;
}
#box,#box1
{
  padding:13px 0px 10px;
  padding-left:28px;
  width:677px;
  height:180px;
}
</style>
</head>
<body>
  <div id="box"></div>
  <div id="box1"></div>
</body>
</html>

代码描述：javascript数据曲线图。javascript数据曲线图实例代码

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