def coords_behind_2D_perpwall(coord, angletable_2D=arc_tools.TABLE, shellcache=shell_tools.CACHE):
# 'high' should be bigger -- if not, we have a wraparound scenario
(low, high) = edges_of_coord(coord)
# print low, high
if low > high:
# wraparound, correct terms
(low, high) = (high, low)
between = angletable_2D.between(0, low) | angletable_2D.between(high, 360) - set([coord])
else:
between = angletable_2D.between(low, high) - set([coord]) # <---<<< !!! THIS IS CRUCIAL! Otherwise blocking propagates?
mag = int(round(magnitude(coord)))
return utils.fast_hemiarc(between, mag, shellcache)
def potentially_illuminated(self):
potential = self.angletable2D.around(self.angle, self.arc_length) | set([(0,0)])
return potential - utils.fast_hemiarc(potential, self.radius, self.shellcache)
