使用 raphael 基础类库画图，兼容 ie6+

coderyin
700 阅读4分钟
原文链接： www.jianshu.com

由于业务需要所有的图表都支持在ie8上能正常显示，且设计在设计图表时未遵循市面上的highcharts、echarts，经过团队调研，最终选择了raphael。本文主要从效果图、基础API、demo三方面来介绍。

  • 首先看一下最终的效果图

雷达图

环形进度
  • 基础API

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  • 雷达图demo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
padding: 0;
margin: 0;
}
</style>
<script src="./raphael.min.js"></script>
</head>
<body>
<div class="container">
  <div id="rate-chart-wrap" class="rate-chart"></div>
</div>
<script type="text/javascript">
/**
* 根据圆心、半径、角度得到元素的坐标
* @return {[type]} [点的坐标]
*/

function getLocationByDeg(deg, percent, isOutter) {
var x0 = 160,
y0 = 160;
var r = !!percent ? 83 * percent : 93;
r = percent === 0 ? 3 : r;
r = !isOutter ? r : 125;
var x1 = parseInt((x0 + r * Math.cos(deg*3.14/180)).toFixed(0));
var y1 = parseInt((x0 + r * Math.sin(deg*3.14/180)).toFixed(0));
return {'x': x1, 'y': y1};
}

/**
* 获得所有需要的点的位置
* @param {[type]} initParams [description]
* @return {[type]} [description]
*/
function getDotsPosition(initParams) {
//所有外面标记点的坐标集合
var outsideDots= [];
var outsideTextDots= [];
var insideDots = [];
var outLineDots = [];
var totalOutLineObj = {
'100': [],
'75': [],
'50': [],
'25': []
};

var dotNums = initParams.length;
var deg = 360 / dotNums; //每个扇形所占的角度
for(var i = 0; i < dotNums; i++) {
outsideDots.push(getLocationByDeg(270 - deg * i));
outsideTextDots.push(getLocationByDeg(270 - deg * i, 1, true));
insideDots.push(getLocationByDeg((270 - deg * i),(initParams[i].score)/100));
outLineDots.push(getLocationByDeg(270 - deg * i, 1));
totalOutLineObj['100'].push(getLocationByDeg((270 - deg * i),1));
totalOutLineObj['75'].push(getLocationByDeg((270 - deg * i),0.75));
totalOutLineObj['50'].push(getLocationByDeg((270 - deg * i),0.5));
totalOutLineObj['25'].push(getLocationByDeg((270 - deg * i ),0.25));
}

return {'outsideDots': outsideDots,'outsideTextDots': outsideTextDots, 'insideDots': insideDots, 'outLineDots': outLineDots, 'totalOutLineObj': totalOutLineObj};
}

//将内部的点连接起来并填充颜色
function drawPath(dots) {
var length = dots.length;
var p = ['M'];

for (var i = 0; i < length; i++) {
var dot = dots[i];
p.push(dot.x, dot.y, 'L');
}
p = p.slice(0, -1);
p.push('Z');
return p;
}

function drawRadarChart(initParams) {
var paramsLength = initParams.length;
var colors = [
'rgb(92, 215, 120)',
'rgb(120, 164, 255)',
'rgb(200, 150, 254)',
'rgb(255, 130, 121)',
'rgb(254, 178, 50)',
'rgb(177, 221, 48)'
];

for (var i = 0; i < paramsLength; i++) {
initParams[i]['color'] = colors[i%5];
}

var dotLength = initParams.length;
var dotsPosition = getDotsPosition(initParams);
var outsideDots = dotsPosition.outsideDots,
outsideTextDots = dotsPosition.outsideTextDots,
insideDots = dotsPosition.insideDots,
outLineDots = dotsPosition.outLineDots,
totalOutLineObj = dotsPosition.totalOutLineObj;

var paper = Raphael(document.getElementById("rate-chart-wrap"), 320, 320);
var st = paper.set();

//画最外层的折线(100%,75%,50%,25)
paper.path().attr({
'path': drawPath(totalOutLineObj['100']),
'fill': 'rgba(148, 255, 139, 0.12)',
'stroke': 'rgb(205, 241, 205)'
});

paper.path().attr({
'path': drawPath(totalOutLineObj['75']),
'fill': 'rgba(148, 255, 139, 0.12)',
'stroke': 'rgb(205, 241, 205)'
});

paper.path().attr({
'path': drawPath(totalOutLineObj['50']),
'fill': 'rgba(148, 255, 139, 0.12)',
'stroke': 'rgb(205, 241, 205)'
});

paper.path().attr({
'path': drawPath(totalOutLineObj['25']),
'fill': 'rgba(148, 255, 139, 0.12)',
'stroke': 'rgb(205, 241, 205)'
});

for (var i = 0; i < dotLength; i++) {
//画外部的点线文字
var outsideDot = outsideDots[i];
var outsideTextDot = outsideTextDots[i];
var nameY = outsideTextDot.y,
nameX = outsideTextDot.x,
scoreY = outsideTextDot.y,
scoreX = outsideTextDot.x;
if(nameY < 160) {
nameY += 20;
} else if(nameY > 160) {
scoreY -= 10;
nameY += 10;
} else if(nameY == 160) {
scoreY -= 10;
nameY += 10;
}
st.push(
paper.path('M'+outLineDots[i].x+','+outLineDots[i].y+'L160,160Z').attr({
// 'fill': '#eee',
'stroke': 'rgb(187, 223, 187)'
}),
paper.circle(outsideDot.x, outsideDot.y, 3).attr({
'fill': initParams[i].color,
'stroke': initParams[i].color
}),
paper.text(nameX, nameY, initParams[i].name).attr({
'font-size': '12px',
'fill': 'rgb(102, 102, 102)'
}),
paper.text(scoreX, scoreY, initParams[i].score).attr({
'fill': initParams[i].color,
'font-size': '18px'
})
);
}
paper.path().attr({
'path': drawPath(insideDots),
'fill': '270-rgba(159,240,79,0.3)-rgba(56,189,88,0.4)',
'stroke': 'rgb(91, 208, 48)'
});
}

drawRadarChart([
{
'name': 'A',
'score': 15
}, {
'name': 'BB',
'score': 80
}, {
'name': 'CCC',
'score': 60
}, {
'name': 'DDDD',
'score': 86
}

]);

</script>
</body>
</html>
  • 圆环形进度
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <div id="ring-chart" style="background: red"></div>
  <script src="./raphael.min.js">

  </script>

  <script>
  let imgCircleLine = './images/cirle-line.png';
  let imgCircleStroke = './images/circle-stroke.png';

//将内部的点连接起来并填充颜色
function drawPath(dots) {
  var length = dots.length;
  var p = ['M'];
  for (var i = 0; i < length; i++) {
    var dot = dots[i];
    p.push(dot.x, dot.y, 'L');
  }
  p = p.slice(0, -1);
  p.push('Z');
  return p;
}

function getLocationByDeg(percent, isOutter) {
  var deg = -(percent / 100) * 360 - 90;
  var x0 = 70,
      y0 = 70;
  var r = 55;

  r = isOutter ? 69 : r;

  var x1 = x0 + r * Math.cos(deg*3.14/180);
  var y1 = x0 + r * Math.sin(deg*3.14/180);

  return {'x': x1, 'y': y1};;
}

function drawRingChart(percent) {
  percent = 100 - percent;
  var paperRing = Raphael(document.getElementById("ring-chart"), 140, 140);


  paperRing.image(imgCircleLine, 0, 0, 140, 140);
  paperRing.image(imgCircleStroke, 8, 8, 124, 124);

  var finalX = getLocationByDeg(percent).x;
  var finalY = getLocationByDeg(percent).y;

  //大角度则为1，小角度则为0
  var orientationNum = 0;
  if(percent > 50){
    orientationNum = 1;
  }

  var pPercent = ["M", 70, 15, "A", 55, 55, 0, orientationNum, 0, finalX, finalY];
  paperRing.path().attr({
    'path': pPercent,
    'stroke-width': 14,
    'stroke': '#76c573'
  });

  var finalXOuter = getLocationByDeg(percent, true).x;
  var finalYOuter = getLocationByDeg(percent, true).y;
  var pPercentOuter = ["M", 69, 1, "A", 69, 69, 0, orientationNum, 0, finalXOuter, finalYOuter];
  paperRing.path().attr({
    'path': pPercentOuter,
    'stroke-width': 4,
    'stroke': '#5cbb5c'
  });
}

drawRingChart(30);
</script>
</body>
</html>

希望对您有用~~

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