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You can decorate the radar chart with colors using the <SolidColor> and <Stroke> element tags.

<RadarGridLines>

  • radarFill : the fill color for the space between two consecutive series.
  • radarAlternateFill : the alternate fill color for the space between two consecutive series.
  • radialStroke : the color for the line which connects two categories which are facing each other.
  • angularStroke : the color for the line which connects all categories circularly.

<Axis2DRenderer>

  • axisStroke : the color for the vertical axis or horizontal axis.
  • tickStroke : tick color.
...
<RadarChart ... >
'''
  <RadarGridLines ... >
    <radarFill>
      <SolidColor color="#efefef" />
    </radarFill>
    <radarAlternateFill>
      <SolidColor color="#fffffc" />
    </radarAlternateFill>
    <radialStroke>
      <Stroke color="#000000" weight="1" />
    </radialStroke>
    <angularStroke>
      <Stroke color="#FF0000" weight="1" />
    </angularStroke>
  </RadarGridLines>
...
  <radialAxisRenderers>
    <Axis2DRenderer horizontal="true" ... >
      <axisStroke>
        <Stroke color="#FF6666" weight="4" />
      </axisStroke>
      <tickStroke>
        <Stroke color="#FF6666" weight="1" alpha="0.2" />
      </tickStroke>
    </Axis2DRenderer>
    <Axis2DRenderer horizontal="false" ... >
      <axisStroke>
        <Stroke color="#FF6666" weight="4" />
      </axisStroke>
      <tickStroke>
        <Stroke color="#FF6666" weight="1" alpha="0.2" />
      </tickStroke>
    </Axis2DRenderer>
  </radialAxisRenderers>
...  
</RadarChart>
...

<SolidColor>

color The color attribute is to set the fill color of the column.
alpha The alpha attribute is to set the transparency of the fill color.

<Stroke>

weight The weight attribute is to set the thickness of the border line.
color The color attribute is to set the border color of the column.
alpha The alpha attribute is to set the transparency of the border color.

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