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# Copyright 2018 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Logic for dealing with coordinates.
This introduces some helpers and terminology that are used throughout MiniGo.
MiniGo Coordinate: This is a tuple of the form (row, column) that is indexed
starting out at (0, 0) from the upper-left.
Flattened Coordinate: this is a number ranging from 0 - N^2 (so N^2+1
possible values). The extra value N^2 is used to mark a 'pass' move.
SGF Coordinate: Coordinate used for SGF serialization format. Coordinates use
two-letter pairs having the form (column, row) indexed from the upper-left
where 0, 0 = 'aa'.
KGS Coordinate: Human-readable coordinate string indexed from bottom left, with
the first character a capital letter for the column and the second a number
from 1-19 for the row. Note that KGS chooses to skip the letter 'I' due to
its similarity with 'l' (lowercase 'L').
PYGTP Coordinate: Tuple coordinate indexed starting at 1,1 from bottom-left
in the format (column, row)
So, for a 19x19,
Coord Type upper_left upper_right pass
-------------------------------------------------------
minigo coord (0, 0) (0, 18) None
flat 0 18 361
SGF 'aa' 'sa' ''
KGS 'A19' 'T19' 'pass'
"""
import go
# We provide more than 19 entries here in case of boards larger than 19 x 19.
_SGF_COLUMNS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
_KGS_COLUMNS = 'ABCDEFGHJKLMNOPQRSTUVWXYZ'
def from_flat(flat):
"""Converts from a flattened coordinate to a MiniGo coordinate."""
if flat == go.N * go.N:
return None
return divmod(flat, go.N)
def to_flat(coord):
"""Converts from a MiniGo coordinate to a flattened coordinate."""
if coord is None:
return go.N * go.N
return go.N * coord[0] + coord[1]
def from_sgf(sgfc):
"""Converts from an SGF coordinate to a MiniGo coordinate."""
if sgfc is None or sgfc == '':
return None
return _SGF_COLUMNS.index(sgfc[1]), _SGF_COLUMNS.index(sgfc[0])
def to_sgf(coord):
"""Converts from a MiniGo coordinate to an SGF coordinate."""
if coord is None:
return ''
return _SGF_COLUMNS[coord[1]] + _SGF_COLUMNS[coord[0]]
def from_kgs(kgsc):
"""Converts from a KGS coordinate to a MiniGo coordinate."""
if kgsc == 'pass':
return None
kgsc = kgsc.upper()
col = _KGS_COLUMNS.index(kgsc[0])
row_from_bottom = int(kgsc[1:])
return go.N - row_from_bottom, col
def to_kgs(coord):
"""Converts from a MiniGo coordinate to a KGS coordinate."""
if coord is None:
return 'pass'
y, x = coord
return '{}{}'.format(_KGS_COLUMNS[x], go.N - y)