纯HTML5 Canvas实现的饼图
发布时间：2020-12-14 23:37:09 所属栏目：Java 来源：网络整理
导读：今天PHP站长网 52php.cn把收集自互联网的代码分享给大家，仅供参考。 htmlheadmeta http-equiv="X-UA-Compatible" content="chrome=IE8"script src="js/fishcomponent.js"/scriptscript src="js/pie.js"/scripttitleMy De
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以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家，仅供参考 <html>
<head>
<meta http-equiv="X-UA-Compatible" content="chrome=IE8">
<script src="js/fishcomponent.js"></script>
<script src="js/pie.js"></script>
<title>My Demo 1</title>
<script>
window.onload = function() {
var canvas = document.getElementById("pie_canvas");
var seriesData = [{name:"apples",value:150,color:"RGBA(255,1)"},{name:"orange",value:100,255,{name:"banana",value:80,{name:"peaches",value:60,color:"RGBA(0,{name:"strawberries",value:40,127,1)"}]
var config = {
width : 600,height: 400,series: seriesData,canvas: canvas,unit: "kg",title:"Fruit Sales",tooltips : {
enable : true
},animation :{
enable: true
},legend : {
enable : true
},text : {
enable: true
},};
pieChart.initSettings(config);
pieChart.render();
}
</script>
</head>
<body>
<h1>Pie Chart Demo</h1>
<div id="my_container" style="width:600px; height:500px;">
<canvas id="pie_canvas"></canvas>
</div>
<div id="btn-group">
<button type="button" id="clear-button">Clear Plot</button>
<button type="button" id="refresh-button">Draw Plot</button>
</div>
</body>
</html>
var pieChart = {
width: 600,series: [],chartCanvas: null,selectable : true,title: "Pie Chart",legend : {
enable : true
},edge : {
width: 50,height: 50
},animation: {
enable: true,animCanvas : null,hh: 1,// trick is here!! for animation play
pctx: null
},tooltips: {
enable: true,tooltipCanvas : null,ttContext: null,index: -1
},circle : {
cx: 0,cy: 0,radius: 0
},text : {
enable: false,content:[]
},initSettings: function (config) {
this.chartCanvas = config.canvas;
this.chartCanvas.width = config.width;
this.chartCanvas.height = config.height;
this.width = config.width;
this.height = config.height;
this.series = config.series;
this.title = config.title;
this.unit = config.unit;
if(config.tooltips != undefined) {
this.tooltips.enable = config.tooltips.enable;
}
if(config.animation != undefined) {
this.animation.enable = config.animation.enable;
}
if(config.legend != undefined) {
this.legend.enable = config.legend.enable;
}
if(config.text != undefined) {
this.text.enable = config.text.enable;
}
},render : function() {
// initialization circle
this.circle.cx = this.width/2;
this.circle.cy = this.height/2;
this.circle.radius = Math.min(this.width/2,this.height/2) - Math.max(this.edge.width,this.edge.height);
var ctx = null;
if(this.animation.enable) {
this.animation.animCanvas = document.createElement("canvas");
this.animation.animCanvas.width = this.width;
this.animation.animCanvas.height = this.height;
ctx = this.animation.animCanvas.getContext("2d");
} else {
ctx = this.chartCanvas.getContext("2d");
this.renderBorder(ctx);
}
if(this.circle.radius <= 0) {
ctx.strokeText("Can not reader the chart,Circle is too small.");
return;
}
// draw each arc according to data series
var sum = 0;
var nums = this.series.length;
for(var i=0; i<nums; i++) {
sum += this.series[i].value;
}
// draw title
ctx.font = '18pt Calibri';
ctx.fillText(this.title,this.width/2 - this.edge.width,30);
ctx.save();
var deltaArc = 0;
for(var i=0; i<nums; i++) {
var precent = this.series[i].value/sum;
this.renderPie(ctx,i,precent,deltaArc);
deltaArc += 2*Math.PI * precent;
}
ctx.restore();
// add blur shadow
ctx.save();
ctx.shadowColor = "black";
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 10;
ctx.beginPath();
ctx.arc(this.circle.cx,this.circle.cy,this.circle.radius,Math.PI * 2,false);
ctx.closePath();
ctx.lineWidth = 1;
ctx.strokeStyle = "RGBA(127,1)";
ctx.stroke();
ctx.restore();
// render legend
ctx.save();
this.renderLegend(ctx,sum);
ctx.restore();
// play animation
if(this.animation.enable) {
var parent = this;
this.animation.pctx = this.chartCanvas.getContext("2d");
this.renderBorder(this.animation.pctx);
setTimeout(function() {parent.playAnimation(parent);},1000/20);
}
},showTooltips : function(loc,ctx) {
if(!this.tooltips.enable) {
return;
}
var dx = loc.x - this.width/2;
var dy = loc.y - this.height/2;
var dis = Math.floor(Math.sqrt(dx * dx + dy * dy));
if(dis <= this.circle.radius) {
// draw tool tip text
var angle = Math.atan2(dy,dx);
if(angle <= 0) {
// if[-Math.PI,0],make it[Math.PI,2*Math.PI]
angle = angle + 2*Math.PI;
}
var sum = 0;
var nums = this.series.length;
for(var s=0; s<nums; s++) {
sum += this.series[s].value;
}
var deltaArc = 0;
var index = 0;
for(var i=0; i<nums; i++) {
var precent = this.series[i].value/sum;
deltaArc += 2*Math.PI * precent;
if(angle<=deltaArc) {
index = i;
break;
}
}
if(this.tooltips.tooltipCanvas == null) {
this.tooltips.tooltipCanvas = document.createElement("canvas");
this.tooltips.ttContext = this.tooltips.tooltipCanvas.getContext("2d");
this.tooltips.tooltipCanvas.width = 150;
this.tooltips.tooltipCanvas.height = 100;
}
// only draw once
// if(index == this.tooltips.index){
// return;
// }
this.clearTooltips(ctx);
this.tooltips.index = index;
var m_context = this.tooltips.ttContext;
m_context.save();
m_context.clearRect(0,this.tooltips.tooltipCanvas.width,this.tooltips.tooltipCanvas.height);
m_context.lineWidth = 2;
m_context.strokeStyle = this.series[index].color;
m_context.fillStyle="RGBA(255,0.7)";
// m_context.strokeRect(2,2,this.tooltips.tooltipCanvas.width-4,this.tooltips.tooltipCanvas.height-4);
// m_context.fillRect(2,this.tooltips.tooltipCanvas.height-4);
m_context.roundRect(2,this.tooltips.tooltipCanvas.height-4,5,true,true);
m_context.font="14px Arial";
m_context.fillStyle="RGBA(0,1)";
m_context.fillText("Index: " + (index + 1),20);
m_context.fillText(this.series[index].name + ": " + this.series[index].value + this.unit,40);
m_context.fillText(this.series[index].precent,60);
m_context.restore();
// make tool-tip rectangle is always visible
if((loc.x + this.tooltips.tooltipCanvas.width)> this.width) {
loc.x = loc.x - this.tooltips.tooltipCanvas.width;
}
if((loc.y - this.tooltips.tooltipCanvas.height) <= 0) {
loc.y = loc.y + this.tooltips.tooltipCanvas.height;
}
ctx.drawImage(this.tooltips.tooltipCanvas,this.tooltips.tooltipCanvas.height,loc.x,loc.y-this.tooltips.tooltipCanvas.height,this.tooltips.tooltipCanvas.height);
} else {
this.tooltips.index = -1;
this.clearTooltips(ctx);
}
},clearTooltips : function(ctx) {
ctx.clearRect(0,this.width,this.height);
this.renderBorder(ctx);
ctx.drawImage(this.animation.animCanvas,this.height,this.height);
},renderBorder : function(ctx) {
ctx.save();
ctx.fillStyle="white";
ctx.strokeStyle="black";
ctx.fillRect(0,this.height);
ctx.strokeRect(0,this.height);
ctx.restore();
},renderPie : function(ctx,index,deltaArc) {
var endAngle = deltaArc + 2*Math.PI*precent;
ctx.beginPath();
ctx.arc(this.circle.cx,deltaArc,endAngle,false);
ctx.moveTo(this.circle.cx,this.circle.cy);
ctx.lineTo(this.circle.cx + this.circle.radius * Math.cos(deltaArc),this.circle.cy + this.circle.radius * Math.sin(deltaArc));
ctx.lineTo(this.circle.cx + this.circle.radius * Math.cos(endAngle),this.circle.cy + this.circle.radius * Math.sin(endAngle));
ctx.lineTo(this.circle.cx,this.circle.cy);
ctx.closePath();
ctx.fillStyle = this.series[index].color;
ctx.fill();
// render text content
if(this.text.enable) {
var halfEndAngle = deltaArc + Math.PI*precent;
var hx = this.circle.cx + this.circle.radius * Math.cos(halfEndAngle);
var hy = this.circle.cy + this.circle.radius * Math.sin(halfEndAngle);
ctx.beginPath();
ctx.moveTo(hx,hy);
var linePos = (hx < this.circle.cx) ? (hx - this.edge.width) : (hx + this.edge.width);
ctx.lineTo(linePos,hy);
ctx.closePath();
ctx.strokeStyle="black";
ctx.stroke();
var textPos = (hx < this.circle.cx) ? (hx - this.edge.width*2) : (hx + this.edge.width);
precent = Math.round (precent*100) / 100;
var size = this.text.content.length;
var tipStr = (size > index) ? this.text.content[index] : this.series[index].name + ": " + (precent * 100).toFixed(0) + "%";
ctx.font = '10pt Calibri';
ctx.fillStyle="black";
ctx.fillText(tipStr,textPos,hy);
}
},renderLegend : function(ctx,sum) {
if(!this.legend.enable) return;
var nums = this.series.length;
ctx.font = '10pt Calibri';
var pos = (this.width/2 > (this.circle.radius+50)) ? 50 : (this.circle.cx - this.circle.radius);
for(var i=0; i<nums; i++) {
var x = this.series[i].value/sum;
x = Math.round (x*100) / 100;
var tipStr = this.series[i].name + ": " + (x * 100).toFixed(0) + "%";
this.series[i].precent = tipStr;
ctx.fillStyle = this.series[i].color;
ctx.fillRect(pos - 40,20*i+10,10,10);
ctx.fillStyle = "black";
ctx.fillText(tipStr,pos - 25,20*i+20);
}
},playAnimation : function(parent) {
if(parent.animation.hh < parent.height) {
parent.animation.pctx.save();
parent.animation.pctx.globalAlpha=0.5;
parent.animation.pctx.clearRect(0,parent.width,parent.height);
parent.renderBorder(parent.animation.pctx);
parent.animation.pctx.drawImage(parent.animation.animCanvas,this.animation.hh,this.animation.hh);
parent.animation.hh = parent.animation.hh + 10;
parent.animation.pctx.restore();
setTimeout(function() {parent.playAnimation(parent);},1000/20);
} else {
parent.animation.pctx.clearRect(0,parent.height,parent.height);
// enable tool-tip functionality
if(parent.animation.enable && parent.legend.enable) {
parent.chartCanvas.addEventListener('mousemove',function(event) {
var x = event.pageX;
var y = event.pageY;
var canvas = event.target;
var bbox = canvas.getBoundingClientRect();
var loc = { x: x - bbox.left * (canvas.width / bbox.width),y: y - bbox.top * (canvas.height / bbox.height)};
parent.showTooltips(loc,(parent.animation.enable ? parent.animation.pctx : ctx));
},false);
}
}
},}; 源代码可以直接使用
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