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v0.5.1
v0.5.1
https://github.com/python/cpython
Tip revision: 1da43e5e916949c8e849e656d9d05fa4b9d6836c authored by Benjamin Peterson on 26 June 2009, 13:21:52 UTC
rearrange the sections of the README, so they'll hopefully be more in the order people will interested in
rearrange the sections of the README, so they'll hopefully be more in the order people will interested in
Tip revision: 1da43e5
life.py
#!/usr/bin/env python
# life.py -- A curses-based version of Conway's Game of Life.
# Contributed by AMK
#
# An empty board will be displayed, and the following commands are available:
# E : Erase the board
# R : Fill the board randomly
# S : Step for a single generation
# C : Update continuously until a key is struck
# Q : Quit
# Cursor keys : Move the cursor around the board
# Space or Enter : Toggle the contents of the cursor's position
#
# TODO :
# Support the mouse
# Use colour if available
# Make board updates faster
#
import random, string, traceback
import curses
class LifeBoard:
"""Encapsulates a Life board
Attributes:
X,Y : horizontal and vertical size of the board
state : dictionary mapping (x,y) to 0 or 1
Methods:
display(update_board) -- If update_board is true, compute the
next generation. Then display the state
of the board and refresh the screen.
erase() -- clear the entire board
makeRandom() -- fill the board randomly
set(y,x) -- set the given cell to Live; doesn't refresh the screen
toggle(y,x) -- change the given cell from live to dead, or vice
versa, and refresh the screen display
"""
def __init__(self, scr, char=ord('*')):
"""Create a new LifeBoard instance.
scr -- curses screen object to use for display
char -- character used to render live cells (default: '*')
"""
self.state = {}
self.scr = scr
Y, X = self.scr.getmaxyx()
self.X, self.Y = X-2, Y-2-1
self.char = char
self.scr.clear()
# Draw a border around the board
border_line = '+'+(self.X*'-')+'+'
self.scr.addstr(0, 0, border_line)
self.scr.addstr(self.Y+1,0, border_line)
for y in range(0, self.Y):
self.scr.addstr(1+y, 0, '|')
self.scr.addstr(1+y, self.X+1, '|')
self.scr.refresh()
def set(self, y, x):
"""Set a cell to the live state"""
if x<0 or self.X<=x or y<0 or self.Y<=y:
raise ValueError("Coordinates out of range %i,%i"% (y,x))
self.state[x,y] = 1
def toggle(self, y, x):
"""Toggle a cell's state between live and dead"""
if x<0 or self.X<=x or y<0 or self.Y<=y:
raise ValueError("Coordinates out of range %i,%i"% (y,x))
if (x,y) in self.state:
del self.state[x,y]
self.scr.addch(y+1, x+1, ' ')
else:
self.state[x,y] = 1
self.scr.addch(y+1, x+1, self.char)
self.scr.refresh()
def erase(self):
"""Clear the entire board and update the board display"""
self.state = {}
self.display(update_board=False)
def display(self, update_board=True):
"""Display the whole board, optionally computing one generation"""
M,N = self.X, self.Y
if not update_board:
for i in range(0, M):
for j in range(0, N):
if (i,j) in self.state:
self.scr.addch(j+1, i+1, self.char)
else:
self.scr.addch(j+1, i+1, ' ')
self.scr.refresh()
return
d = {}
self.boring = 1
for i in range(0, M):
L = range( max(0, i-1), min(M, i+2) )
for j in range(0, N):
s = 0
live = (i,j) in self.state
for k in range( max(0, j-1), min(N, j+2) ):
for l in L:
if (l,k) in self.state:
s += 1
s -= live
if s == 3:
# Birth
d[i,j] = 1
self.scr.addch(j+1, i+1, self.char)
if not live: self.boring = 0
elif s == 2 and live: d[i,j] = 1 # Survival
elif live:
# Death
self.scr.addch(j+1, i+1, ' ')
self.boring = 0
self.state = d
self.scr.refresh()
def makeRandom(self):
"Fill the board with a random pattern"
self.state = {}
for i in range(0, self.X):
for j in range(0, self.Y):
if random.random() > 0.5:
self.set(j,i)
def erase_menu(stdscr, menu_y):
"Clear the space where the menu resides"
stdscr.move(menu_y, 0)
stdscr.clrtoeol()
stdscr.move(menu_y+1, 0)
stdscr.clrtoeol()
def display_menu(stdscr, menu_y):
"Display the menu of possible keystroke commands"
erase_menu(stdscr, menu_y)
stdscr.addstr(menu_y, 4,
'Use the cursor keys to move, and space or Enter to toggle a cell.')
stdscr.addstr(menu_y+1, 4,
'E)rase the board, R)andom fill, S)tep once or C)ontinuously, Q)uit')
def keyloop(stdscr):
# Clear the screen and display the menu of keys
stdscr.clear()
stdscr_y, stdscr_x = stdscr.getmaxyx()
menu_y = (stdscr_y-3)-1
display_menu(stdscr, menu_y)
# Allocate a subwindow for the Life board and create the board object
subwin = stdscr.subwin(stdscr_y-3, stdscr_x, 0, 0)
board = LifeBoard(subwin, char=ord('*'))
board.display(update_board=False)
# xpos, ypos are the cursor's position
xpos, ypos = board.X//2, board.Y//2
# Main loop:
while (1):
stdscr.move(1+ypos, 1+xpos) # Move the cursor
c = stdscr.getch() # Get a keystroke
if 0<c<256:
c = chr(c)
if c in ' \n':
board.toggle(ypos, xpos)
elif c in 'Cc':
erase_menu(stdscr, menu_y)
stdscr.addstr(menu_y, 6, ' Hit any key to stop continuously '
'updating the screen.')
stdscr.refresh()
# Activate nodelay mode; getch() will return -1
# if no keystroke is available, instead of waiting.
stdscr.nodelay(1)
while (1):
c = stdscr.getch()
if c != -1:
break
stdscr.addstr(0,0, '/')
stdscr.refresh()
board.display()
stdscr.addstr(0,0, '+')
stdscr.refresh()
stdscr.nodelay(0) # Disable nodelay mode
display_menu(stdscr, menu_y)
elif c in 'Ee':
board.erase()
elif c in 'Qq':
break
elif c in 'Rr':
board.makeRandom()
board.display(update_board=False)
elif c in 'Ss':
board.display()
else: pass # Ignore incorrect keys
elif c == curses.KEY_UP and ypos>0: ypos -= 1
elif c == curses.KEY_DOWN and ypos<board.Y-1: ypos += 1
elif c == curses.KEY_LEFT and xpos>0: xpos -= 1
elif c == curses.KEY_RIGHT and xpos<board.X-1: xpos += 1
else:
# Ignore incorrect keys
pass
def main(stdscr):
keyloop(stdscr) # Enter the main loop
if __name__ == '__main__':
curses.wrapper(main)