Syntax:
#include <maths.h>
integer_variable = ATan (_x_vector_,_y_vector_)Explanation:
GCBASIC supports the trigonometric function for ATan.
Details:
GCBASIC supports the following functions ATan( x, y) where x and y are the vectors. The function returns an Integer result representing the angle measured in a whole number of degrees.
The function also returns a global byte variable NegFlag with returns the quadrant of the angle.
Quadrant 1 = 0 to 89 Quadrant 2 = 90 to 179 Quadrant 3 = 180 to 269 Quadrant 4 = 270 to 359
This ATan function is a fast XY vector to integer degree algorithm developed in Jan 2011, see www.RomanBlack.com and see http://www.romanblack.com/integer_degree.htm
The function converts any XY vectors including 0 to a degree value that should be within +/- 1 degree of the accurate value without needing large slow trig functions like ArcTan() or ArcCos().
At least one of the X or Y values must be non-zero. This is the full version, for all 4 quadrants and will generate the angle in integer degrees from 0-360. Any values of X and Y are usable including negative values provided they are between -1456 and 1456 so the 16bit multiply does not overflow.
