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263 lines
8.8 KiB
263 lines
8.8 KiB
#!/usr/bin/env python3
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"""
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A curses-based version of Conway's Game of Life.
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An empty board will be displayed, and the following commands are available:
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E : Erase the board
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R : Fill the board randomly
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S : Step for a single generation
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C : Update continuously until a key is struck
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Q : Quit
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Cursor keys : Move the cursor around the board
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Space or Enter : Toggle the contents of the cursor's position
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Contributed by Andrew Kuchling, Mouse support and color by Dafydd Crosby.
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"""
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import curses
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import random
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class LifeBoard:
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"""Encapsulates a Life board
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Attributes:
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X,Y : horizontal and vertical size of the board
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state : dictionary mapping (x,y) to 0 or 1
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Methods:
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display(update_board) -- If update_board is true, compute the
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next generation. Then display the state
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of the board and refresh the screen.
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erase() -- clear the entire board
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make_random() -- fill the board randomly
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set(y,x) -- set the given cell to Live; doesn't refresh the screen
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toggle(y,x) -- change the given cell from live to dead, or vice
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versa, and refresh the screen display
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"""
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def __init__(self, scr, char=ord('*')):
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"""Create a new LifeBoard instance.
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scr -- curses screen object to use for display
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char -- character used to render live cells (default: '*')
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"""
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self.state = {}
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self.scr = scr
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Y, X = self.scr.getmaxyx()
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self.X, self.Y = X - 2, Y - 2 - 1
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self.char = char
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self.scr.clear()
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# Draw a border around the board
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border_line = '+' + (self.X * '-') + '+'
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self.scr.addstr(0, 0, border_line)
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self.scr.addstr(self.Y + 1, 0, border_line)
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for y in range(0, self.Y):
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self.scr.addstr(1 + y, 0, '|')
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self.scr.addstr(1 + y, self.X + 1, '|')
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self.scr.refresh()
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def set(self, y, x):
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"""Set a cell to the live state"""
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if x < 0 or self.X <= x or y < 0 or self.Y <= y:
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raise ValueError("Coordinates out of range %i,%i" % (y, x))
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self.state[x, y] = 1
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def toggle(self, y, x):
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"""Toggle a cell's state between live and dead"""
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if x < 0 or self.X <= x or y < 0 or self.Y <= y:
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raise ValueError("Coordinates out of range %i,%i" % (y, x))
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if (x, y) in self.state:
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del self.state[x, y]
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self.scr.addch(y + 1, x + 1, ' ')
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else:
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self.state[x, y] = 1
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if curses.has_colors():
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# Let's pick a random color!
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self.scr.attrset(curses.color_pair(random.randrange(1, 7)))
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self.scr.addch(y + 1, x + 1, self.char)
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self.scr.attrset(0)
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self.scr.refresh()
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def erase(self):
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"""Clear the entire board and update the board display"""
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self.state = {}
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self.display(update_board=False)
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def display(self, update_board=True):
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"""Display the whole board, optionally computing one generation"""
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M, N = self.X, self.Y
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if not update_board:
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for i in range(0, M):
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for j in range(0, N):
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if (i, j) in self.state:
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self.scr.addch(j + 1, i + 1, self.char)
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else:
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self.scr.addch(j + 1, i + 1, ' ')
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self.scr.refresh()
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return
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d = {}
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self.boring = 1
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for i in range(0, M):
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L = range(max(0, i - 1), min(M, i + 2))
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for j in range(0, N):
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s = 0
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live = (i, j) in self.state
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for k in range(max(0, j - 1), min(N, j + 2)):
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for l in L:
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if (l, k) in self.state:
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s += 1
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s -= live
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if s == 3:
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# Birth
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d[i, j] = 1
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if curses.has_colors():
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# Let's pick a random color!
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self.scr.attrset(curses.color_pair(
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random.randrange(1, 7)))
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self.scr.addch(j + 1, i + 1, self.char)
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self.scr.attrset(0)
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if not live:
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self.boring = 0
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elif s == 2 and live:
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# Survival
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d[i, j] = 1
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elif live:
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# Death
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self.scr.addch(j + 1, i + 1, ' ')
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self.boring = 0
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self.state = d
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self.scr.refresh()
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def make_random(self):
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"Fill the board with a random pattern"
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self.state = {}
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for i in range(0, self.X):
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for j in range(0, self.Y):
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if random.random() > 0.5:
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self.set(j, i)
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def erase_menu(stdscr, menu_y):
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"Clear the space where the menu resides"
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stdscr.move(menu_y, 0)
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stdscr.clrtoeol()
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stdscr.move(menu_y + 1, 0)
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stdscr.clrtoeol()
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def display_menu(stdscr, menu_y):
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"Display the menu of possible keystroke commands"
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erase_menu(stdscr, menu_y)
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# If color, then light the menu up :-)
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if curses.has_colors():
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stdscr.attrset(curses.color_pair(1))
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stdscr.addstr(menu_y, 4,
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'Use the cursor keys to move, and space or Enter to toggle a cell.')
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stdscr.addstr(menu_y + 1, 4,
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'E)rase the board, R)andom fill, S)tep once or C)ontinuously, Q)uit')
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stdscr.attrset(0)
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def keyloop(stdscr):
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# Clear the screen and display the menu of keys
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stdscr.clear()
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stdscr_y, stdscr_x = stdscr.getmaxyx()
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menu_y = (stdscr_y - 3) - 1
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display_menu(stdscr, menu_y)
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# If color, then initialize the color pairs
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if curses.has_colors():
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curses.init_pair(1, curses.COLOR_BLUE, 0)
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curses.init_pair(2, curses.COLOR_CYAN, 0)
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curses.init_pair(3, curses.COLOR_GREEN, 0)
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curses.init_pair(4, curses.COLOR_MAGENTA, 0)
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curses.init_pair(5, curses.COLOR_RED, 0)
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curses.init_pair(6, curses.COLOR_YELLOW, 0)
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curses.init_pair(7, curses.COLOR_WHITE, 0)
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# Set up the mask to listen for mouse events
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curses.mousemask(curses.BUTTON1_CLICKED)
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# Allocate a subwindow for the Life board and create the board object
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subwin = stdscr.subwin(stdscr_y - 3, stdscr_x, 0, 0)
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board = LifeBoard(subwin, char=ord('*'))
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board.display(update_board=False)
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# xpos, ypos are the cursor's position
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xpos, ypos = board.X // 2, board.Y // 2
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# Main loop:
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while True:
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stdscr.move(1 + ypos, 1 + xpos) # Move the cursor
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c = stdscr.getch() # Get a keystroke
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if 0 < c < 256:
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c = chr(c)
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if c in ' \n':
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board.toggle(ypos, xpos)
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elif c in 'Cc':
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erase_menu(stdscr, menu_y)
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stdscr.addstr(menu_y, 6, ' Hit any key to stop continuously '
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'updating the screen.')
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stdscr.refresh()
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# Activate nodelay mode; getch() will return -1
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# if no keystroke is available, instead of waiting.
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stdscr.nodelay(1)
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while True:
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c = stdscr.getch()
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if c != -1:
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break
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stdscr.addstr(0, 0, '/')
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stdscr.refresh()
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board.display()
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stdscr.addstr(0, 0, '+')
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stdscr.refresh()
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stdscr.nodelay(0) # Disable nodelay mode
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display_menu(stdscr, menu_y)
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elif c in 'Ee':
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board.erase()
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elif c in 'Qq':
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break
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elif c in 'Rr':
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board.make_random()
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board.display(update_board=False)
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elif c in 'Ss':
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board.display()
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else:
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# Ignore incorrect keys
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pass
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elif c == curses.KEY_UP and ypos > 0:
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ypos -= 1
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elif c == curses.KEY_DOWN and ypos + 1 < board.Y:
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ypos += 1
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elif c == curses.KEY_LEFT and xpos > 0:
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xpos -= 1
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elif c == curses.KEY_RIGHT and xpos + 1 < board.X:
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xpos += 1
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elif c == curses.KEY_MOUSE:
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mouse_id, mouse_x, mouse_y, mouse_z, button_state = curses.getmouse()
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if (mouse_x > 0 and mouse_x < board.X + 1 and
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mouse_y > 0 and mouse_y < board.Y + 1):
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xpos = mouse_x - 1
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ypos = mouse_y - 1
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board.toggle(ypos, xpos)
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else:
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# They've clicked outside the board
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curses.flash()
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else:
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# Ignore incorrect keys
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pass
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def main(stdscr):
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keyloop(stdscr) # Enter the main loop
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if __name__ == '__main__':
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curses.wrapper(main)
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