def _free_line_of_sight(self, x0, y0, x1, y1):
"Check if the line is free of cells blocking the light."
line = get_line(x0, y0, x1, y1)
for cell in line:
if self[cell].block_light:
return False
return True
def clear_los(self, posA, posB):
"Check if both objects have a clear line of sight"
i0, j0 = posA
i1, j1 = posB
los = library.get_line(i0, j0, i1, j1)
#other_ships = {pos:ship for pos, ship in self.entities['ships'].iteritems()
#if (ship is not objA and ship is not objB)}
for cell in los:
if cell in self.entities['asteroids'] or \
cell in self.entities['ships'] and \
cell != (i0, j0) and cell != (i1, j1):
return False
return True
def get_field_of_vision(self, x, y, radius):
"""
Returns a list of tile coordinates in the field of vision.
We first get a bounding circle around our position. Then we raycast lines
going from the position (x, y) to the bounding circle. If we hit a block_light Tile,
we make it visible and stop to look further on that ray.
"""
points = set()
border = self._get_bounding_circle(x, y, radius)
for border_x, border_y in border:
for tile_x, tile_y in get_line(x, y, border_x, border_y):
points.add( (tile_x, tile_y) )
if not self[tile_x, tile_y].block_light:
# To remove artifacts, check surrounding cells for a wall
points.update(self._reveal_adjacent_walls(tile_x, tile_y, x, y, radius))
else:
break
return points
