Spirited Machine ·
Here's a small collection of modules I use frequently since I work with a lot of interface-related projects, hopefully they might help you out sometime.
Coordinate System Conversions - Polar->Rectangular - Rectangular->Polar
Angle Conversions - Degrees->Radians - Radians->Degrees
Distance Related - Distance Calculation - Less than specified Distance (Boolean Test) - Greater than specified Distance (Boolean Test)