Adding rainbow module.

[kattni]

Adds rainbow module with colorwheel() function. Removes colorwheel() from _pixelbuf.

[gamblor21]

Did a quick look, everything seems fine with me. One question but probably something you did on purpose.

[dhalbert]

The one failure is that some escornabot_makech builds were too big. That board is a robot with wheels, etc. Based on that, you could turn off MIDI and I think that would not crimp any uses.

In ports/atmel_samd/boards/escornabot_makech/mpconfigboard.mk, add CIRCUITPY_USB_MIDI = 0. An example of that is in adafruit_proxlight_trinkey_m0/mpconfigboard.mk (along with other things).

Once #4903 is merged, we won't be so close to the edge on many builds.

[kattni]

@dhalbert Fix submitted. Also updated copyright in _pixelbuf that I meant to include in the first place, but did not want to restart the entire CI process for only that change.

[dhalbert]

Thanks and congrats!

[dhalbert]

Partly addresses #4926.

[tannewt]

Sorry I just looked at this. We shouldn't call this rainbow because of the existing pypi package: https://pypi.org/project/rainbow/

We could call it adafruit_rainbow though. Or rainbowio :-)

[dhalbert]

adafruit_rainbow is ok by me, or even rainbowio. Or:

• rainbows (not taken in PyPi)
• pixel_colors
• rgb
• color_math
• color_calc

[kattni]

So I really like rainbowio but on the off chance we have to make a Python library version of colorwheel(), I should perhaps accept adafruit_rainbow so the name would be the same and all the code would work. It comes down to, what is the likelihood that we'll have to do a Python version? The only reason the Python version of Pixelbuf exists is that _pixelbuf was too big for tiny builds. rainbow built fine into all but one build, so I'm inclined to think we're not going to need a Python version. I'd like to avoid needing a Python version, but if that's going to happen, we'll end up in a _pixelbuf/adafruit_pypixelbuf situation again with rainbowio.

[tannewt]

We could make a rainbowio pypi package if we really wanted to.