How to set different fill colors for different groups in a radar chart?
Published: 2024-05-08 07:31:48

## Question Description

As shown in the figure, the radar chart has multiple groups. Can different fill colors be set for different groups?


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/vqs01mj52fqqtd5pqebs.png)



## Solution

All VChart graphical elements support functional styles, which allow you to define custom functions to return different fill colors based on the data in the style.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/do7s3fi87l26g4pxkubm.png)




## Code Examples

```
const spec = {
  type: 'radar',
  data: [
    {
      values: [
        {
          month: 'Jan.',
          value: 45,
          type: 'A'
        },
        {
          month: 'Feb.',
          value: 61,
          type: 'A'
        },
        {
          month: 'Mar.',
          value: 92,
          type: 'A'
        },
        {
          month: 'Apr.',
          value: 57,
          type: 'A'
        },
        {
          month: 'May.',
          value: 46,
          type: 'A'
        },
        {
          month: 'Jun.',
          value: 36,
          type: 'A'
        },
        {
          month: 'Jul.',
          value: 33,
          type: 'A'
        },
        {
          month: 'Aug.',
          value: 63,
          type: 'A'
        },
        {
          month: 'Sep.',
          value: 57,
          type: 'A'
        },
        {
          month: 'Oct.',
          value: 53,
          type: 'A'
        },
        {
          month: 'Nov.',
          value: 69,
          type: 'A'
        },
        {
          month: 'Dec.',
          value: 40,
          type: 'A'
        },
        {
          month: 'Jan.',
          value: 31,
          type: 'B'
        },
        {
          month: 'Feb.',
          value: 39,
          type: 'B'
        },
        {
          month: 'Mar.',
          value: 81,
          type: 'B'
        },
        {
          month: 'Apr.',
          value: 39,
          type: 'B'
        },
        {
          month: 'May.',
          value: 64,
          type: 'B'
        },
        {
          month: 'Jun.',
          value: 21,
          type: 'B'
        },
        {
          month: 'Jul.',
          value: 58,
          type: 'B'
        },
        {
          month: 'Aug.',
          value: 72,
          type: 'B'
        },
        {
          month: 'Sep.',
          value: 47,
          type: 'B'
        },
        {
          month: 'Oct.',
          value: 37,
          type: 'B'
        },
        {
          month: 'Nov.',
          value: 80,
          type: 'B'
        },
        {
          month: 'Dec.',
          value: 74,
          type: 'B'
        },
        {
          month: 'Jan.',
          value: 90,
          type: 'C'
        },
        {
          month: 'Feb.',
          value: 95,
          type: 'C'
        },
        {
          month: 'Mar.',
          value: 62,
          type: 'C'
        },
        {
          month: 'Apr.',
          value: 52,
          type: 'C'
        },
        {
          month: 'May.',
          value: 74,
          type: 'C'
        },
        {
          month: 'Jun.',
          value: 87,
          type: 'C'
        },
        {
          month: 'Jul.',
          value: 80,
          type: 'C'
        },
        {
          month: 'Aug.',
          value: 69,
          type: 'C'
        },
        {
          month: 'Sep.',
          value: 74,
          type: 'C'
        },
        {
          month: 'Oct.',
          value: 84,
          type: 'C'
        },
        {
          month: 'Nov.',
          value: 94,
          type: 'C'
        },
        {
          month: 'Dec.',
          value: 23,
          type: 'C'
        }
      ]
    }
  ],
  categoryField: 'month',
  valueField: 'value',
  seriesField: 'type',
  area: {
    visible: true,
    style: {
      fill: (datum, ctx) => {
        return datum.type === 'A' ? ctx.seriesColor(datum.type): false;
      }
    }
  },
  axes: [
    {
      orient: 'radius',
      min: 0,
      domainLine: {
        visible: true
      },
      label: {
        visible: true
      },
      grid: {
        smooth: true
      }
    },
    {
      orient: 'angle',
      tick: {
        visible: false
      },
      grid: {
        style: {
          lineDash: [0]
        }
      }
    }
  ],
  legends: {
    visible: true,
    orient: 'top'
  }
};

const vchart = new VChart(spec, { dom: CONTAINER_ID });
vchart.renderSync();

// Just for the convenience of console debugging, DO NOT COPY!
window['vchart'] = vchart;
```

## Result Presentation


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/pogx3nax9dhyoklr7qin.png)



## Related Documents

-   [Tutorial of Graphical Elements](https://www.visactor.com/vchart/guide/tutorial_docs/Chart_Concepts/Series/Mark)[](https://visactor.com/vchart/guide/tutorial_docs/Chart_Concepts/Axes)
-   [VChart github](https://github.com/VisActor/VChart)