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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Interesting - could be a rounding issue. I know as @allObjects mentioned circles aren't great either.
If anyone wants to have a go at improving fillPoly/fillEllipse then the code's here: https://github.com/espruino/Espruino/blob/master/libs/graphics/graphics.c#L441
You can easily build Espruino 'native' on Linux/Mac/Windows(via Linux subsystem for Windows) and can test using code like this: https://github.com/espruino/Espruino/blob/master/tests/test_graphics_ellipse.js
Or even just a bit of C code all on its own would be appreciated. I can merge it into Espruino as long as it works well (although if you're copying it rather than making your own it'll need to be compatible with MPLv2's license).