The Python matplotlib package supports the concept of a colormap for selecting colors for each data set that is displayed -- the user uses an index, like color 0, 1, 2, etc and this is mapped to a RGB value in the color map. The visual aspect of a plot can be changed just by switching the color map.
The color maps that are available to the matplotlib user have a nice set of colors chosen by experts (presumably) and this makes it easy to create nice looking plots, you can see the colors here: https://matplotlib.org/examples/color/colormaps_reference.html The `plot` library from Racket allows specifying colors by using the RGB triplet, or by using the `->pen-color` function which converts an index into a hardcoded set of colors -- this is similar to the color map concept, except that the available colors are not as nice and they are hardcoded: https://docs.racket-lang.org/plot/utils.html?q=-%3Epen-color#%28def._%28%28lib._plot%2Futils..rkt%29._-~3epen-color%29%29 I would like to add support for color maps to the plot package, if others consider it worthwile. The way I think it would work is that a new plot parameter (say `plot-pen-color-map`) would be defined and `->pen-color` would be changed to use the user specified color map instead of the default set of colors (the default set would still be used if no color map is specified). I put together some prototype code (including a screenshot of what it would look like) here: https://gist.github.com/alex-hhh/8ca14a0890dc2cfa8fc89e0c816d86da Technically this could be implemented outside the `plot` package, but I think it is much nicer to be readily available when Racket is installed and it will result in much nicer looking plots for a lot less effort. Do others think this would be useful? Alex. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
