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canvas 实现 柱状图
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了canvas 实现 柱状图，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含6029字，纯文字阅读大概需要9分钟。
内容图文
define([],function(){
var myChart={
init:function(options){
this.ctx = options.ctx;
this.data = options.data;
this.yInterval =options.yInterval||10;
this.marginX=options.marginX||8
this.w1=options.w1||25
this.ox=options.ox||30
this.yearMoney=options.yearMonty
this.bottom=70
this.draw()
},
setUnderLine:function(a,b){
this.ctx.beginPath()
this.ctx.lineWidth = 0.6
this.ctx.strokeStyle="#999999"
var dataCollection = this.dataarray[0].datacollection;
if(b){
x1=a*(this.w1+this.marginX)+this.ox
x2=b*(this.w1+this.marginX)+this.ox
x3=24*(this.w1+this.marginX)+this.ox
}
/* this.ctx.moveTo(this.ox+this.w1, this.ctx.canvas.clientHeight -10);
this.ctx.lineTo(dataCollection.length*(this.w1+this.marginX)+this.ox-this.marginX, this.ctx.canvas.clientHeight -10 );
this.ctx.stroke();*/
var yearText= _.keys(this.yearMoney)
var yearValue= _.values(this.yearMoney)
for(var i=0;i<=(dataCollection.length-1)/12;i++){
var x1=i*(this.w1+this.marginX)*12+this.ox+this.w1
var y1=this.ctx.canvas.clientHeight -10
var y2=this.ctx.canvas.clientHeight -30
this.ctx.beginPath()
this.ctx.moveTo(x1, y1 );
this.ctx.lineTo(x1, y2 );
this.ctx.stroke();
this.ctx.beginPath()
if(i<(dataCollection.length-1)/12){
this.ctx.moveTo(x1, this.ctx.canvas.clientHeight-10);
this.ctx.lineTo(x1+140, this.ctx.canvas.clientHeight-10)
}
if(i>0){
this.ctx.moveTo(x1, this.ctx.canvas.clientHeight -10 );
this.ctx.lineTo(x1-140,this.ctx.canvas.clientHeight -10);
}
this.ctx.stroke();
this.ctx.fillStyle="black"
this.ctx.fillText(yearText[i]+"年业绩", x1+165 ,this.ctx.canvas.clientHeight -15);
/*this.ctx.fillStyle="#64B7E9"*/
this.ctx.fillText(yearValue[i], x1+170 ,this.ctx.canvas.clientHeight -1);
}
this.ctx.fillStyle="#8dbb42"
this.ctx.fillText("入职",this.data.n1*(this.w1+this.marginX)+this.ox+this.w1-16,this.ctx.canvas.clientHeight -40);
/* this.ctx.fillText("职",this.data.n1*(this.w1+this.marginX)+this.ox+this.w1-6,this.ctx.canvas.clientHeight -25);*/
},
drawCloumn:function(){
var x = this.ox+this.w1
var y = this.ctx.canvas.clientHeight;
var colors = ["#AEDAF5", "#FFCC00"];
for (var i = 0; i < this.dataarray.length; i++) {
dataCollection = this.dataarray[i].datacollection;
this.ctx.beginPath();
this.ctx.lineWidth = this.w1;
this.ctx.strokeStyle = colors[i];
for (var j = 0; j < dataCollection.length; j++) {
metaData = dataCollection[j];
this.ctx.moveTo(x, y - this.bottom);
this.ctx.lineTo(x, y - this.bottom - (metaData.amount / this.yInterval) * 50 );
this.ctx.stroke();
this.ctx.fillStyle="black"
//绘制柱的金额
this.ctx.font = "10px Arial";this.ctx.textAlign = "start";
if(metaData.amount!==""){
this.ctx.fillStyle="black"
var amountTMP=metaData.amount*1
amountTMP= amountTMP.toFixed(2)
if(amountTMP==0.00){
amountTMP=" "
}
}
else{
this.ctx.fillStyle="#999999"
amountTMP=" "
}
this.ctx.fillText(amountTMP, x-15, y - this.bottom - 1 - (metaData.amount / this.yInterval) * 50);
//绘制柱的标题
this.ctx.font = "12px Arial";
this.ctx.fillText(metaData.title, x-this.w1/2 , y -this.bottom+15);
x += (this.categoryCount * this.w1 + this.marginX);
}
/*ffffffffffff*/
var aa=this.ox+this.w1
for (var j = 0; j < dataCollection.length; j++) {
this.ctx.beginPath()
this.ctx.lineWidth = 1
this.ctx.strokeStyle="#999999"
this.ctx.moveTo(aa, y - this.bottom);
this.ctx.lineTo(aa, y - this.bottom+5);
this.ctx.stroke();
aa+= (this.categoryCount * this.w1 + this.marginX);
}
/*ddddddd*/
x = 80 + 30 * (i + 1);
}
},
draw:function(){
//柱状图标题
var title = this.data.title;
//Y轴标题
var verticaltitle = this.data.verticaltitle;
//X轴标题
var horizontaltitle = this.data.horizontaltitle;
//颜色
var colors = ["#AEDAF5", "#FFCC00"];
this.dataarray = this.data.data;
var dataCollection;
var metaData;
var maxamount = 0;
this.categoryCount = this.dataarray.length;
this.dataCount = this.dataarray[0].datacollection.length;
//找出最大的数值，以便绘制Y轴的刻度。
for (var i = 0; i < this.dataarray.length; i++) {
dataCollection = this.dataarray[i].datacollection;
for (var j = 0; j < dataCollection.length; j++) {
metaData = dataCollection[j]; /*alert(metaData.amount);*/
maxamount = (new Number(metaData.amount) > maxamount) ? metaData.amount : maxamount;
}
}
this.maxAmount=maxamount
//动态设置 canvas 的尺寸
this.ctx.canvas.height = Math.ceil(this.maxAmount / this.yInterval) * 50 + 100; //120 is for the chart title.
this.ctx.canvas.width = this.categoryCount * this.dataCount * this.w1 + this.dataCount*this.marginX + 50; //150 is for right side index
$("#myCanvasDiv").scrollLeft($("#myCanvasDiv")[0].scrollWidth)
/* this.verticalbar()*/
this.horizontalbar()
this.drawCloumn()
this.setUnderLine()
},
verticalbar:function(){
//计算需要绘制几个刻度
var segmentcount = Math.ceil(this.maxAmount / this.yInterval);
//Y轴的高度
var height = segmentcount * 50;
this.height=height
//绘制Y轴
this.ctx.beginPath();
this.ctx.lineWidth = 1;
this.ctx.strokeStyle = "#999999";
this.ctx.moveTo(this.ox, this.ctx.canvas.clientHeight - this.bottom);
this.ctx.lineTo(this.ox, this.ctx.canvas.clientHeight - this.bottom - height - 20);
this.ctx.stroke();
//绘制刻度数
this.ctx.font = "12px Arial";
this.ctx.textAlign = "end";
this.ctx.fillText("0", this.ox-10, this.ctx.canvas.clientHeight - this.bottom);
for (var j = 1; j < segmentcount + 1; j++) {
/* this.ctx.lineWidth = 1;
this.ctx.strokeStyle = "#999999";*/
this.ctx.beginPath();
this.ctx.moveTo(this.ox, this.ctx.canvas.clientHeight - this.bottom - (j ) * 50 );
this.ctx.lineTo(this.ox-10, this.ctx.canvas.clientHeight -this.bottom - (j ) * 50 );
this.ctx.stroke();
this.ctx.fillText(this.yInterval * j, this.ox-10 , this.ctx.canvas.clientHeight - this.bottom - (j - 1) * 50 -40);
}
},
horizontalbar:function(){
var width = this.categoryCount * this.dataCount * this.w1 + this.dataCount*this.marginX;
//绘制X轴
this.ctx.beginPath();
this.ctx.lineWidth = 1;
this.ctx.strokeStyle = "#999999";
this.ctx.moveTo(this.ox, this.ctx.canvas.clientHeight - this.bottom);
this.ctx.lineTo(this.ox+width+50, this.ctx.canvas.clientHeight - this.bottom);
this.ctx.stroke();
}
}
return myChart
})
原文：http://www.cnblogs.com/breakdown/p/3786784.html
内容总结
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