I spent some time and ported the NeoPixel Matrix library from Adafruit over to the Spark Core. You can even use it in the web IDE if you include the
Adafruit_GFX libraries in your project.
You can checkout the source code here. I’m pretty confident it should work in any/most projects. I’m a week or two into my project with the Matrix and the library hasn’t failed me once.
It was pretty easy to port actually thanks to the work from @BDub on the NeoPixel library.
Would love feedback!