[GitHub] pissang commented on issue #9700: Pie chart with radial gradient

[GitBox <gi...@apache.org>]

pissang commented on issue #9700: Pie chart with radial gradient
URL: https://github.com/apache/incubator-echarts/issues/9700#issuecomment-452154285
 
 
   It's better to use `global` coordinates to declare the radial gradient in your scene.
   ```js
   option = {
     "color": [
       "rgb(65, 140, 240)",
       "rgb(252, 180, 65)",
       "rgb(224, 64, 10)",
       "rgb(5, 100, 146)",
     ],
     "dataset": [
       {
         "source": [
           {
             "name": "A",
             "value": 25,
           },
           {
             "name": "B",
             "value": 25,
           },
           {
             "name": "C",
             "value": 25
           },
           {
             "name": "D",
             "value": "25"
           }
         ],
       }
     ],
     "series": [
       {
         "type": "pie",
         "startAngle": 0,
         data: [
           {
             "name": "A",
             "value": 25,
           },
           {
             "name": "B",
             "value": 25,
           },
           {
             "name": "C",
             "value": 25
           },
           {
             "name": "D",
             "value": "25"
           }
         ],
         "itemStyle": {
             color: function (args) {
               var c = option.color[args.dataIndex],
                   c2 = c.replace(')', ',.8)'),
                   c3 = c.replace(')', ',.9)')
                   
               return {
                 // Use global coordinates
                 global: true,
                 type: 'radial',
                 x: myChart.getWidth() / 2, // calculate x
                 y: myChart.getHeight() / 2, // calculate y
                 r: 200,
                 colorStops: [
                   { offset: .75, color: c3 },
                   { offset: .95, color: c2 },
                   { offset: 1, color: c }
                 ]
               }
             }            
         },
       }
     ]
   }
   ```

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