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index.html
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<!Doctype Html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Line Chart Demo</title>
<style>
body{
background-color:#fff;
}
canvas{
position:relative;
top:50px;
background-color:white;
box-shadow: 3px 3px 3px #7e7a7c;
}
</style>
</head>
<body>
<canvas width="700" height="400" id="canvas"> </canvas>
<script>
window.onload = function(){
var multiData = {values:[
{ value0:[
{x:"2007",y:5},
{x:"2009",y:5},
{x:"2011",y:80},
]},
{ value1:[
{x:"2007",y:20},
{x:"2009",y:50},
{x:"2011",y:10},
]},
{ value2:[
{x:"2007",y:10},
{x:"2009",y:60},
{x:"2011",y:70},
]},
{ value3:[
{x:"2007",y:50},
{x:"2009",y:40},
{x:"2011",y:60},
]}
]
}//必须按照这个格式定义数据，关键字values value0 value1 ......
/*
*@param0: canvas 的id
*@param1: json 数据
*@param2: 坐标距离画布的间隙padding
*@param3: 如果只有一条数据时数据的颜色，多条数据颜色随机
*@param4: 点的颜色
*@param5: 是否绘制背景线
*@param6: 是否是多条数据
*/
//先定义数据线的名字，再绘制数据
LineChart.setKey(["中国","美国","英国","德国"]);
LineChart.setData("canvas",multiData,60,"red","#333",true,true);
}
var LineChart={
keynames:[],//数据信息数组
can:undefined,
ctx:undefined,
width:undefined,
lineColor:undefined,
dotColor:undefined,
isBg:false,
isMultiData:false,
setData:function(canId,data,padding,lineColor,dotColor,isBg,isMultiData){
this.lineColor = lineColor;
this.dotColor = dotColor;
this.can = document.getElementById(canId);
this.ctx = this.can.getContext("2d");
this.isBg = isBg;
this.isMultiData = isMultiData;
this.drawXY(data,0,padding,this.can);
},
isMultiData:function(data){
if(data.values.length>1){
this.isMultiData = true;
}
},//是否是多条数据线
drawXY:function(data,key,padding,can){
this.ctx.lineWidth="4";
this.ctx.strokeStyle="black";
this.ctx.font = 'italic 15px sans-serif';
this.ctx.beginPath();
this.ctx.moveTo(padding,0)
this.ctx.lineTo(padding,can.height-padding);
this.ctx.lineTo(can.width-150,can.height-padding);//补充：修改了宽度
this.ctx.stroke();
var perwidth = this.getPixel(data,key,can.width-150,padding);//x 轴每一个数据占据的宽度//补充：修改了宽度
var maxY = this.getMax(data,0,this.isMultiData);//获得Y轴上的最大值
var yPixel = this.getYPixel(maxY,can.height,padding).pixel;
var ycount = this.getYPixel(maxY,can.height,padding).ycount;
for( var i=0,ptindex;i< data.values[key]["value"+key].length;i++ ){
ptindex = i+1;
var x_x = this.getCoordX(padding,perwidth,ptindex);
var x_y = can.height-padding+20;
this.ctx.fillText(data.values[key]["value"+key][i].x,x_x,x_y,perwidth);
}
this.ctx.textAlign = "right"//y轴文字靠右写
this.ctx.textBaseline = "middle";//文字的中心线的调整
for(var i=0;i< ycount/10;i++){
this.ctx.fillText(i*10,padding-10,(ycount/10-i)*10*yPixel,perwidth);
}
if(this.isBg){
var x = padding;
this.ctx.lineWidth="1";
this.ctx.strokeStyle="#e8e8e8";
for( var i=0;i< ycount/10;i++ ){
var y = (ycount/10-i)*10*yPixel;
this.ctx.moveTo(x,y);
this.ctx.lineTo(can.width-150,y);//补充：修改了宽度
this.ctx.stroke();
}
}//选择绘制背景线
this.ctx.closePath();
this.drawData(data,0,padding,perwidth,yPixel,this.isMultiData);
},//绘制XY坐标 线 以及点
drawData:function(data,key,padding,perwidth,yPixel,isMultiData,lineColor){
if(!isMultiData){
var keystr = "value"+key;
this.ctx.beginPath();
this.ctx.lineWidth="2";
if(arguments[6]){
this.ctx.strokeStyle=lineColor;
}else{
this.ctx.strokeStyle=this.lineColor;
}
var startX = this.getCoordX(padding,perwidth,0);
var startY = this.getCoordY(padding,yPixel,data.values[key][keystr][0].y);
this.ctx.beginPath();
this.ctx.lineWidth="2";
for( var i=0;i< data.values[key][keystr].length;i++ ){
var x = this.getCoordX(padding,perwidth,i+1);
var y = this.getCoordY(padding,yPixel,data.values[key][keystr][i].y);
this.ctx.lineTo(x,y);
}
this.ctx.stroke();
this.ctx.closePath();
/*下面绘制数据线上的点*/
this.ctx.beginPath();
this.ctx.fillStyle=this.dotColor;
for( var i=0;i< data.values[key][keystr].length;i++ ){
var x = this.getCoordX(padding,perwidth,i+1);
var y = this.getCoordY(padding,yPixel,data.values[key][keystr][i].y);
this.ctx.moveTo(x,y);
this.ctx.arc(x,y,3,0,Math.PI*2,true);//绘制数据线上的点
this.ctx.fill();
}
this.ctx.closePath();
}else{//如果是多条数据线
for( var i=0;i< data.values.length;i++ ){
var color = "rgb("+parseInt(Math.random()*256)+","+parseInt(Math.random()*256)+","+parseInt(Math.random()*256)+")";
LineChart.drawData(data,i,padding,perwidth,yPixel,false,color);
LineChart.drawKey(color,this.keynames[i],padding,i);
}
}
},//绘制数据线和数据点
getPixel:function(data,key,width,padding){
var count = data.values[key]["value"+key].length;
return (width-20-padding)/(count+(count-1)*1.5);
},//宽度
getCoordX:function(padding,perwidth,ptindex){//下标从1开始 不是从0开始
return 2.5*perwidth*ptindex+padding+10-2*perwidth;
},//横坐标X 随ptindex 获得
getCoordY:function(padding,yPixel,value){
var y = yPixel*value;
return this.can.height-padding-y;
},//纵坐标X 随ptindex 获得(注意 纵坐标的算法是倒着的因为原点在最上面)
getYPixel:function(maxY,height,padding){
var ycount = (parseInt(maxY/10)+1)*10+10;//y轴最大值
return {pixel:(height-padding)/ycount,ycount:ycount};
},//y轴的单位长度
getMax:function(data,key,isMultiData){
if(!isMultiData){
var maxY = data.values[key]["value"+key][0].y;
var length = data.values[key]["value"+key].length;
var keystr = "value"+key;
for( var i=1;i< length;i++ ){
if(maxY< data.values[key][keystr][i].y) maxY=data.values[key][keystr][i].y;
}
return maxY;//返回最大值 如果不是多数据
}else{
var maxarr=[];
var count = data.values.length;//多条数据的数据长度
for(var i=0;i< count;i++){
maxarr.push(LineChart.getMax(data,i,false));
}
var maxvalue = maxarr[0];
for(var i=1;i< maxarr.length;i++){
maxvalue = (maxvalue< maxarr[i])?maxarr[i]:maxvalue;
}
return maxvalue;
}//如果是多数据
},
setKey:function(keynames){//keynames 是数组
for(var i=0;i< keynames.length;i++){
this.keynames.push(keynames[i]);//存入数组中
}
},
drawKey:function(color,keyname,padding,lineindex){
var x = padding+500;
var y = this.can.height - padding+20+20*(lineindex+1)-200;
this.ctx.beginPath();
this.ctx.strokeStyle = color;
this.ctx.font="13px";
this.ctx.moveTo(x,y);
this.ctx.lineTo(x+50,y);
this.ctx.fillText(keyname,x+100,y,40);
this.ctx.stroke();
this.ctx.closePath();
}
}
</script>
</body>
</html>