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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'.
GTP 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 GTP 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' ''
GTP 'A19' 'T19' 'pass'
"""
import go
# We provide more than 19 entries here in case of boards larger than 19 x 19.
_SGF_COLUMNS = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
_GTP_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 == '' or (go.N <= 19 and sgfc == 'tt'):
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_gtp(gtpc):
"""Converts from a GTP coordinate to a Minigo coordinate."""
gtpc = gtpc.upper()
if gtpc == 'PASS':
return None
col = _GTP_COLUMNS.index(gtpc[0])
row_from_bottom = int(gtpc[1:])
return go.N - row_from_bottom, col
def to_gtp(coord):
"""Converts from a Minigo coordinate to a GTP coordinate."""
if coord is None:
return 'pass'
y, x = coord
return '{}{}'.format(_GTP_COLUMNS[x], go.N - y)