FM / curses

/usr/lib64/python2.7/Demo/curses

Name	Size	Mode	Actions
life.py	7349	0755	edit dl rm
life.pyc	6787	0644	edit dl rm
life.pyo	6787	0644	edit dl rm
ncurses.py	6648	0755	edit dl rm
ncurses.pyc	5845	0644	edit dl rm
ncurses.pyo	5845	0644	edit dl rm
rain.py	2403	0755	edit dl rm
rain.pyc	2295	0644	edit dl rm
rain.pyo	2295	0644	edit dl rm
README	852	0644	edit dl rm
repeat.py	1515	0755	edit dl rm
repeat.pyc	1453	0644	edit dl rm
repeat.pyo	1453	0644	edit dl rm
tclock.py	3331	0755	edit dl rm
tclock.pyc	3648	0644	edit dl rm
tclock.pyo	3648	0644	edit dl rm
xmas.py	25446	0644	edit dl rm
xmas.pyc	19864	0644	edit dl rm
xmas.pyo	19864	0644	edit dl rm

Edit: /usr/lib64/python2.7/Demo/curses/life.py (7349B)

#! /usr/bin/python2.7
# 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)

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