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fig_loopdoubledeal.py
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#!/usr/bin/env python3
# Copyright 2016 Andrew Medworth ([email protected])
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Illustrate double-dealing move on a loop"""
import svg
def make_original_position(layout):
"""Create original position with loops"""
pos = svg.StringsAndCoinsPosition(layout)
other_grid = pos.add_horizontal_loop(10)
pos.next_line()
pos.next_line(small=True)
grid = pos.add_horizontal_loop(10)
pos.next_line()
pos.next_line(small=True)
return [pos, grid, other_grid]
def original(layout, pos):
"""Render original position"""
layout.add_default_text("Original position:")
layout.next_grid_position()
pos.highlight_add_and_move()
def opened(layout, pos, grid):
"""Render position with loop opened"""
layout.add_default_text("Player $A$ must open a loop:")
layout.next_grid_position()
pos.cut_2coin_string(grid[0][3], grid[0][4])
pos.highlight_add_and_move()
def doubledeal(layout, pos, grid):
"""Render double-dealing move"""
layout.add_default_text("Player $B$ double-deals:")
layout.next_grid_position()
# Ends
pos.cut_2coin_string(grid[0][0], grid[1][0])
pos.cut_2coin_string(grid[0][-1], grid[1][-1])
# Horizontals (leaving [0][0] to [0][1] and [1][0] to [1][1])
pos.cut_2coin_string(grid[0][1], grid[0][2])
pos.cut_2coin_string(grid[0][2], grid[0][3])
pos.cut_2coin_string(grid[1][1], grid[1][2])
pos.cut_2coin_string(grid[1][2], grid[1][3])
pos.cut_2coin_string(grid[1][3], grid[1][4])
pos.highlight_add_and_move(colour="red")
def final(layout, pos, grid, other_grid):
"""Render final position"""
layout.add_default_text("Player $A$ must now open the final loop:")
layout.next_grid_position()
pos.cut_2coin_string(grid[0][0], grid[0][1])
pos.cut_2coin_string(grid[1][0], grid[1][1])
pos.cut_2coin_string(other_grid[0][3], other_grid[0][4])
pos.highlight_add_and_move()
layout.add_default_text("Player $B$ takes and wins 4--16.")
def main():
"""Entry point"""
layout = svg.Layout()
[pos, grid, other_grid] = make_original_position(layout)
original(layout, pos)
opened(layout, pos, grid)
doubledeal(layout, pos, grid)
final(layout, pos, grid, other_grid)
layout.render()
if __name__ == "__main__":
main()