88 lines
2.2 KiB
Python
88 lines
2.2 KiB
Python
#!/usr/bin/env python
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# This file is part of A Robot's Conundrum.
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#
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# A Robot's Conundrum is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the Free
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# Software Foundation, either version 3 of the License, or (at your option) any
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# later version.
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#
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# A Robot's Conundrum is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# A Robot's Conundrum. If not, see <http://www.gnu.org/licenses/>.
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#
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# ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
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#
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# direction.py
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# --------------------
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# date created : Tue Aug 7 2012
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# copyright : (C) 2012 Niels G. W. Serup
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# maintained by : Niels G. W. Serup <ngws@metanohi.name>
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"""Directions."""
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class Direction(object):
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@staticmethod
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def next_pos(pos):
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raise NotImplementedError
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@staticmethod
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def to_str():
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raise NotImplementedError
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@staticmethod
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def from_sakse(p):
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return {(0, -1): Up,
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(0, 1): Down,
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(-1, 0): Left,
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(1, 0): Right}[p]
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class Up(Direction):
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@staticmethod
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def next_pos(pos):
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x, y = pos
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return x, y - 1
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@staticmethod
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def to_str():
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return 'up'
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class Right(Direction):
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@staticmethod
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def next_pos(pos):
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x, y = pos
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return x + 1, y
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@staticmethod
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def to_str():
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return 'right'
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class Down(Direction):
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@staticmethod
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def next_pos(pos):
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x, y = pos
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return x, y + 1
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@staticmethod
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def to_str():
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return 'down'
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class Left(Direction):
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@staticmethod
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def next_pos(pos):
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x, y = pos
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return x - 1, y
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@staticmethod
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def to_str():
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return 'left'
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all_directions = [Up, Right, Down, Left]
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_sp = lambda n: lambda d: all_directions[(all_directions.index(d) + n) % 4]
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succ, pred = _sp(1), _sp(-1)
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isDirection = all_directions.__contains__
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