MCL/sf/adapt/qemu: comparison symbian-qemu-0.9.1-12/python-2.6.1/Demo/curses/life.py

equal deleted inserted replaced

-:ffa851df0825
+:2fb8b9db1c86
+#!/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=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 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 += 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)