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<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width,initial-scale=1.0" /> <title>Echarts Example</title> </head> <body> <div id="main" style="width: 600px;height: 400px"></div> <script src="//cdn.bootcss.com/echarts/4.5.0/echarts.js"></script> <script type="text/javascript"> var myChart = echarts.init(document.getElementById('main')); var data = []; var a = 3; var b = 20; for (var i = 0; i <= 360; i++) { var x = (i / 360) * Math.PI; // 椭圆公式 var r = Math.sqrt(Math.pow(a * b, 2) / (Math.pow(a * Math.sin(x), 2) + Math.pow(b * Math.cos(x), 2))); data.push([r, i]); } var option = { toolbox: { feature: { saveAsImage: {}, }, }, polar: {}, angleAxis: { type: 'value', startAngle: 0 }, radiusAxis: { min: 0 }, series: [{ showSymbol: false, coordinateSystem: 'polar', type: 'line', data: data }], }; myChart.setOption(option); </script> </body> </html>
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