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rmatrixrgbchart.jsradar-chart

Pass numeric matrix of rgb color values to chartJSRadar() in R

I'm using chartJSRadar() function in the radarchart package from Chart.js. I want to customize the colors but I can't figure out how to pass the RGB values. My data looks like this:

         Ncount        Strong         Exclusive
 Define     69             19                 6
  Align     74              9                 1
 Refine     84             28                 0
 Assign     77             12                 3

Basically I want a different color for each column. The docs say to pass colors as a matrix of RGB colors in colMatrix. So I've tried- 

chartJSRadar(radarcounts, maxScale = 90, addDots = F, lineAlpha = 0, 
             colMatrix = matrix(c("FF0000","00FF00","0000FF"))

But this just makes all the polygons gray. I can't find working examples of the colMatrix parameter. What should the colMatrix look like?

Solution

  • Finally found a way to format RGB values in a matrix format acceptable to Radarchart. I used grDevices::col2rgb to do so - 

    c <- grDevices::col2rgb(c("orange","blue", "black"))

    Then I just dropped c into the argument list - 

    chartJSRadar(radarcounts, maxScale = 90, addDots = F, lineAlpha = 0, colMatrix = c)

    There is probably a better way to do this, but this is what I found.