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Asked: 2026-05-14T08:45:36+00:00

I want to draw some items on screen, each item is in one of

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I want to draw some items on screen, each item is in one of N sets. The number of sets changes all the time, so I need to calculate N different colours which are as different as possible (to make it easy to identify what is in which set).

So, for example with N = 2 my results would be black and white. With three I guess I would get all red, all green, all blue. For all four, it’s less obvious what the correct answer is, and this is where I’m having trouble.

EDIT:: The obvious approach is to map 0 to Red, 1 to green, and all the colours in between to the appropriate rainbow colours, then you can get a colour for set N by doing GetRainbowColour(N / TotalSets), so a GetRainbowColour method is all that’s need to solve this problem

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1 Answer

  1. Editorial Team

    You can read up on the HSL and HSV color models in this wikipedia article. The “H” in the acronymns stands for Hue, and that is the rainbow you want. It sounds like you want saturation to max out. The article also explains how to convert to RGB color.

    Looks like a similar question has been asked before here.

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