B:BD[
2.5203] → [
2.5203:5488]
// slope, with a maximum distance (in either x or y coordinate) of
// maxrange. Store the visited cells in xpos[] and ypos[], and
// return the number of cells visited.
int shoot_ray( double accx, double accy, const double slope,
int maxrange, int xpos[], int ypos[] )
// slope, bounded by LOS radius. Store the visited cells in
// xpos[] and ypos[], and return the number of cells visited.
int shoot_ray(double accx, double accy, const double slope,
int maxrange, int xpos[], int ypos[])