饼图与渐变（Pie chart with gradient）

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小牛编辑

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2023-12-01

以下是带有渐变的饼图的示例。

我们已经在Highcharts Configuration Syntax一章中看到了用于绘制图表的配置。

下面给出了具有梯度的饼图的示例。

配置 (Configurations)

现在让我们看一下所采取的其他配置/步骤。

颜色

使用Highcharts.getOptions().colors属性配置图表的Highcharts.getOptions().colors 。

// Radialize the colors
Highcharts.getOptions().colors = Highcharts.map(
   Highcharts.getOptions().colors, function (color) {
      return {
         radialGradient: { cx: 0.5, cy: 0.3, r: 0.7 },
         stops: [
            [0, color],
            [1, Highcharts.Color(color).brighten(-0.3).get('rgb')] // darken
         ]
      };
   }
);

例子 (Example)

highcharts_pie_gradient.htm

<html>
   <head>
      <title>Highcharts Tutorial</title>
      <script src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
      </script>
      <script src = "https://code.highcharts.com/highcharts.js"></script>  
   </head>
   <body>
      <div id = "container" style = "width: 550px; height: 400px; margin: 0 auto"></div>
      <script language = "JavaScript">
         $(document).ready(function() {
            var chart = {
               plotBackgroundColor: null,
               plotBorderWidth: null,
               plotShadow: false
            };
            var title = {
               text: 'Browser market shares at a specific website, 2014'   
            };      
            var tooltip = {
               pointFormat: '{series.name}: <b>{point.percentage:.1f}%</b>'
            };
            var plotOptions = {
               pie: {
                  allowPointSelect: true,
                  cursor: 'pointer',
                  dataLabels: {
                     enabled: true,
                     format: '<b>{point.name}%</b>: {point.percentage:.1f} %',
                     style: {
                        color: (Highcharts.theme && Highcharts.theme.contrastTextColor)||
                        'black'
                     }
                  }
               }
            };
            var series = [{
               type: 'pie',
               name: 'Browser share',
               data: [
                  ['Firefox',   45.0],
                  ['IE',       26.8],
                  {
                     name: 'Chrome',
                     y: 12.8,
                     sliced: true,
                     selected: true
                  },
                  ['Safari',    8.5],
                  ['Opera',     6.2],
                  ['Others',   0.7]
               ]
            }];
            // Radialize the colors
            Highcharts.getOptions().colors = Highcharts.map(
               Highcharts.getOptions().colors, function (color) {
                  return {
                     radialGradient: { cx: 0.5, cy: 0.3, r: 0.7 },
                     stops: [
                        [0, color],
                        [1, Highcharts.Color(color).brighten(-0.3).get('rgb')] // darken
                     ]
                  };
               }
            );
            var json = {};   
            json.chart = chart; 
            json.title = title;     
            json.tooltip = tooltip;  
            json.series = series;
            json.plotOptions = plotOptions;
            $('#container').highcharts(json);  
         });
      </script>
   </body>
</html>