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-rw-r--r--cursesmodule/lifedemo.py215
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diff --git a/cursesmodule/lifedemo.py b/cursesmodule/lifedemo.py
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+#!/usr/bin/env python
+# life.py -- A curses-based version of Conway's Game of Life.
+# Contributed by A.M. Kuchling <amk@magnet.com>
+#
+# 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
+#
+
+class LifeBoard:
+ """Encapsulates a Life board
+
+ Attributes:
+ M,N : horizontal and vertical size of the board
+
+ 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('*')):
+ """Return a LifeBoard instance.
+
+ scr -- curses screen object to use for display
+ char -- character used to render live cells (default: '*')
+
+ """
+ self.state={} ; self.scr=scr
+ N, M = self.scr.getmaxyx()
+ self.M, self.N = M-2, N-2-1
+ self.char = char
+ self.scr.clear()
+
+ # Draw a border around the board
+ border_line='+'+(self.M*'-')+'+'
+ self.scr.addstr(0, 0, border_line)
+ self.scr.addstr(self.N+1,0, border_line)
+ for y in range(0, self.N):
+ self.scr.addstr(1+y, 0, '|')
+ self.scr.addstr(1+y, self.M+1, '|')
+ self.scr.refresh()
+ def set(self, y, x):
+ """Set a cell to the live state"""
+ if x<0 or self.M<=x or y<0 or self.N<=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.M<=x or y<0 or self.N<=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.M, self.N
+ 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"""
+ import whrandom
+ self.state={}
+ for i in range(0, self.M):
+ for j in range(0, self.N):
+ if whrandom.random()*10>5.0: 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):
+ import string, curses
+
+ # Clear the screen and dispaly 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.M/2, board.N/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.N-1: ypos=ypos+1
+ elif c==curses.key_left and xpos>0: xpos=xpos-1
+ elif c==curses.key_right and xpos<board.M-1: xpos=xpos+1
+ else: pass # Ignore incorrect keys
+
+if __name__=='__main__':
+ import curses, traceback
+ 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
+
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