M_PI undeclared

[bduhan]

Great project, thank you!

In Visual Studio Community Edition 2015 I get multiple errors stating that M_PI is undeclared in ofxNeoPixelRing.cpp. Everything works if I directly include math.h like this:

#define _USE_MATH_DEFINES
#include <math.h>

I did not submit a pull request because this has not been tested on Linux and OSX yet and it probably makes more sense to change this elsewhere.

[DHaylock]

Hi @bduhan,

I've added the maths header works fine with linux and OSX.

Cheers for spotting this.

D