Source code for maze.tri
# coding=utf-8
'''
pymaze
Copyright (C) 2012-2014 Moses Palmér
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
'''
import math
from . import BaseWall, BaseMaze
class TriWall(BaseMaze.Wall):
# The angles for each corner; this is a list of the tuple (angle, alt_angle)
# where alt_angle is used for the room at x, y when x + y is odd
_ANGLES = []
# The directions for each wall; this is a list of the tuple (dir, alt_dir)
# where alt_dir is used for the room at x, y when x + y is odd
_DIRECTIONS = []
# The names of the walls
NAMES = []
# The list of walls; this is the list [0, 1, 2... N]
WALLS = []
# The horizontal scale factor when converting maze coordinates to physical
# coordinates
HORIZONTAL_MULTIPLICATOR = math.cos(math.pi / 2 + 2 * 2 * math.pi / 3)
# The vertical scale factor when converting maze coordinates to physical
# coordinates
VERTICAL_MULTIPLICATOR = 2 + math.sin(math.pi / 2 + 2 * math.pi / 3)
# The vertical offset added or removed when converting maze coordinates to
# physical coordinates; it is added if x + y is odd
OFFSET = 0.5 * (1 + math.sin(math.pi / 2 + 2 * math.pi / 3))
__slots__ = tuple()
start_angle = math.pi / 2 + 2 * math.pi / 3
data = (
('DIAGONAL_1', (-1, 0), (1, 0)),
('DIAGONAL_2', (1, 0), (-1, 0)),
('HORIZONTAL', (0, -1), (0, 1)))
for i, (name, dir1, dir2) in enumerate(data):
locals()[name] = i
next_angle = _ANGLES[-1][0] - 2 * math.pi / len(data) \
if _ANGLES else start_angle
while next_angle < 0.0:
next_angle += 2 * math.pi
alt_angle = next_angle - math.pi
while alt_angle < 0.0:
alt_angle += 2 * math.pi
_ANGLES.append((next_angle, alt_angle))
_DIRECTIONS.append((dir1, dir2))
NAMES.append(name.lower())
WALLS.append(i)
@classmethod
def from_direction(self, room_pos, direction):
"""
@see Maze.Wall.from_direction
"""
alt = (room_pos[0] + room_pos[1]) % 2
for i, dirs in enumerate(self._DIRECTIONS):
if direction == dirs[alt]:
return self(room_pos, i)
raise ValueError('Invalid direction for %s: %s' % (
str(room_pos), str(direction)))
@classmethod
def from_corner(self, room_pos, wall_index):
"""
@see Maze.Wall.from_corner
"""
start_wall = wall = self(room_pos, wall_index)
while True:
yield wall
back = wall.back
next_room_pos = back.room_pos
next_wall = (int(back) + 1) % len(self.WALLS)
next = self(next_room_pos, next_wall)
if next == start_wall:
break
wall = next
def _get_opposite_index(self):
"""
There is no opposite wall in a triangular room.
@raise NotImplementedError
"""
raise NotImplementedError()
def _get_back_index(self):
"""
@see Maze.Wall._get_back_index
"""
return self.wall
def _get_direction(self):
"""
@see Maze.Wall._get_direction
"""
alt = (self.room_pos[0] + self.room_pos[1]) % 2
return self._DIRECTIONS[self.wall][alt]
def _get_span(self):
"""
@see Maze.Wall._get_span
"""
alt = (self.room_pos[0] + self.room_pos[1]) % 2
start = self._ANGLES[self.wall][alt]
end = self._ANGLES[(self.wall + 1) % len(self._ANGLES)][alt]
return (start, end)
[docs]class TriMaze(BaseMaze):
"""A maze with triangular rooms.
The rooms alternate between having a wall facing downwards and a corner
facing downwards. The room at x, y will have a corner facing downwards if
x + y is odd.
Walls in a triangular maze do not have an opposite wall.
"""
Wall = TriWall
def get_center(self, room_pos):
alt = (room_pos[0] + room_pos[1]) % 2
sign = 1 if alt == 1 else -1
return (
(room_pos[0] + 0.5) * self.Wall.HORIZONTAL_MULTIPLICATOR,
(room_pos[1] + 0.5) * self.Wall.VERTICAL_MULTIPLICATOR \
+ sign * self.Wall.OFFSET)