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+"""
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+Online Shared Gomoku Game
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+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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+All online players are divided into two roles (black and white) and play same Gomoku game together.
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+
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+:demo_host:`Demo </gomoku_game>`, `Source code <https://github.com/wang0618/PyWebIO/blob/dev/demos/gomoku_game.py>`_
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+"""
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+import pywebio, time
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+from pywebio.output import *
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+from pywebio.session import *
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+
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+chessboard_size = 15
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+# -1 -> none, 0 -> black, 1 -> white
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+chessboard = [
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+ [-1] * chessboard_size
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+ for _ in range(chessboard_size)
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+]
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+
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+def winner(): # return winner piece, return None if no winner
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+ for x in range(2, chessboard_size - 2):
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+ for y in range(2, chessboard_size - 2):
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+ # check if (x,y) is the win center
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+ if chessboard[x][y] != -1 and any([
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+ all(chessboard[x][y] == chessboard[m][n] for m, n in [(x - 2, y), (x - 1, y), (x + 1, y), (x + 2, y)]),
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+ all(chessboard[x][y] == chessboard[m][n] for m, n in [(x, y - 2), (x, y - 1), (x, y + 1), (x, y + 2)]),
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+ all(chessboard[x][y] == chessboard[m][n] for m, n in [(x - 2, y - 2), (x - 1, y - 1), (x + 1, y + 1), (x + 2, y + 2)]),
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+ all(chessboard[x][y] == chessboard[m][n] for m, n in [(x - 2, y + 2), (x - 1, y + 1), (x + 1, y - 1), (x + 2, y - 2)]),
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+ ]):
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+ return ['⚫', '⚪'][chessboard[x][y]]
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+
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+session_id = 0 # auto incremented id for each session
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+current_turn = 0 # 0 for black, 1 for white
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+player_count = [0, 0] # count of player for two roles
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+def main():
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+ """Online Shared Gomoku Game
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+
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+ All online players are divided into two roles (black and white) and share this game."""
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+ global session_id, current_turn, chessboard
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+ if winner(): # The current game is over, reset game
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+ chessboard = [[-1] * chessboard_size for _ in range(chessboard_size)]
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+ current_turn = 0
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+
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+ my_turn = session_id % 2
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+ my_chess = ['⚫', '⚪'][my_turn]
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+ session_id += 1
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+ player_count[my_turn] += 1
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+
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+ @defer_call
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+ def player_exit():
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+ player_count[my_turn] -= 1
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+
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+ set_env(output_animation=False)
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+ put_html("""<style> table th, table td { padding: 0px !important;} button {padding: .75rem!important; margin:0!important} </style>""") # Custom styles to make the board more beautiful
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+
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+ put_markdown(f"""# Online Shared Gomoku Game
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+ All online players are divided into two roles (black and white) and share this game. You can open this page in multiple tabs of your browser to simulate multiple users.
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+ This application uses less than 100 lines of code, the source code is [here](https://github.com/wang0618/PyWebIO/blob/dev/demos/gomoku_game.py)
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+ Currently online player: {player_count[0]} for ⚫, {player_count[1]} for ⚪.
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+ Your role is {my_chess}.
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+ """, lstrip=True)
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+
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+ def set_chess(pos):
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+ global current_turn
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+ if current_turn != my_turn:
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+ toast("It's not your turn!!", color='error')
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+ return
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+ x, y = pos
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+ chessboard[x][y] = my_turn
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+ current_turn = (current_turn + 1) % 2
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+
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+ @use_scope('chessboard', clear=True)
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+ def show_chessboard():
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+ table = [
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+ [
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+ put_buttons([dict(label=' ', value=(x, y), color='light')], onclick=set_chess) if cell == -1 else [' ⚫', ' ⚪'][cell]
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+ for y, cell in enumerate(row)
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+ ]
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+ for x, row in enumerate(chessboard)
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+ ]
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+ put_table(table)
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+
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+ show_chessboard()
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+ while not winner():
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+ with use_scope('msg', clear=True):
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+ current_turn_copy = current_turn
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+ if current_turn_copy == my_turn:
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+ put_text("It's your turn!")
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+ else:
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+ put_row([put_text("Your opponent's turn, waiting... "), put_loading().style('width:1.5em; height:1.5em')], size='auto 1fr')
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+ while current_turn == current_turn_copy: # wait for next move
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+ time.sleep(0.2)
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+ show_chessboard()
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+ with use_scope('msg', clear=True):
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+ put_text('Game over. The winner is %s!\nRefresh page to start a new round.' % winner())
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+
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+
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+if __name__ == '__main__':
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+ pywebio.start_server(main, debug=True, port=8080, cdn=False)
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wangweimin