mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
224 lines
6.5 KiB
Python
Executable File
224 lines
6.5 KiB
Python
Executable File
#!/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 self.state.has_key( (x,y) ):
|
|
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=0)
|
|
|
|
def display(self, update_board=1):
|
|
"""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 self.state.has_key( (i,j) ):
|
|
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=self.state.has_key( (i,j) )
|
|
for k in range( max(0, j-1), min(N, j+2) ):
|
|
for l in L:
|
|
if self.state.has_key( (l,k) ):
|
|
s=s+1
|
|
s=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 main(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=0)
|
|
|
|
# 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=0)
|
|
elif c in 'Ss':
|
|
board.display()
|
|
else: pass # Ignore incorrect keys
|
|
elif c==curses.KEY_UP and ypos>0: ypos=ypos-1
|
|
elif c==curses.KEY_DOWN and ypos<board.Y-1: ypos=ypos+1
|
|
elif c==curses.KEY_LEFT and xpos>0: xpos=xpos-1
|
|
elif c==curses.KEY_RIGHT and xpos<board.X-1: xpos=xpos+1
|
|
else: pass # Ignore incorrect keys
|
|
|
|
if __name__=='__main__':
|
|
try:
|
|
# Initialize curses
|
|
stdscr=curses.initscr()
|
|
# Turn off echoing of keys, and enter cbreak mode,
|
|
# where no buffering is performed on keyboard input
|
|
curses.noecho() ; curses.cbreak()
|
|
|
|
# In keypad mode, escape sequences for special keys
|
|
# (like the cursor keys) will be interpreted and
|
|
# a special value like curses.KEY_LEFT will be returned
|
|
stdscr.keypad(1)
|
|
main(stdscr) # Enter the main loop
|
|
# Set everything back to normal
|
|
stdscr.keypad(0)
|
|
curses.echo() ; curses.nocbreak()
|
|
curses.endwin() # Terminate curses
|
|
except:
|
|
# In the event of an error, restore the terminal
|
|
# to a sane state.
|
|
stdscr.keypad(0)
|
|
curses.echo() ; curses.nocbreak()
|
|
curses.endwin()
|
|
traceback.print_exc() # Print the exception
|
|
|