double degToRad(double deg);
double radToDeg(double rad);
void angleToStep(double stepRatioX, double stepRatioY, long &stepX, long &stepY,
                 double angleX, double angleY);
void cartesianToPolar(double stepRatioX, double stepRatioY, double offsetX,
                      double offsetY, double offsetZ, long &stepX, long &stepY,
                      double zeroX, double zeroY, double x, double y, double z);