mirror of https://github.com/python/cpython
90 lines
1.9 KiB
Python
Executable File
90 lines
1.9 KiB
Python
Executable File
#! /usr/local/bin/python
|
|
|
|
# Simulate "electrons" migrating across the screen.
|
|
# An optional bitmap file in can be in the background.
|
|
#
|
|
# Usage: electrons [n [bitmapfile]]
|
|
#
|
|
# n is the number of electrons to animate; default is 4, maximum 15.
|
|
#
|
|
# The bitmap file can be any X11 bitmap file (look in
|
|
# /usr/include/X11/bitmaps for samples); it is displayed as the
|
|
# background of the animation. Default is no bitmap.
|
|
|
|
# This uses Steen Lumholt's Tk interface
|
|
from Tkinter import *
|
|
|
|
|
|
# The graphical interface
|
|
class Electrons:
|
|
|
|
# Create our objects
|
|
def __init__(self, n, bitmap = None):
|
|
self.n = n
|
|
self.tk = tk = Tk()
|
|
self.canvas = c = Canvas(tk)
|
|
c.pack()
|
|
width, height = tk.getint(c['width']), tk.getint(c['height'])
|
|
|
|
# Add background bitmap
|
|
if bitmap:
|
|
self.bitmap = c.create_bitmap(width/2, height/2,
|
|
bitmap=bitmap,
|
|
foreground='blue')
|
|
|
|
self.pieces = {}
|
|
x1, y1, x2, y2 = 10,70,14,74
|
|
for i in range(n,0,-1):
|
|
p = c.create_oval(x1, y1, x2, y2, fill='red')
|
|
self.pieces[i] = p
|
|
y1, y2 = y1 +2, y2 + 2
|
|
self.tk.update()
|
|
|
|
def random_move(self,n):
|
|
for i in range(1,n+1):
|
|
p = self.pieces[i]
|
|
c = self.canvas
|
|
import rand
|
|
x = rand.choice(range(-2,4))
|
|
y = rand.choice(range(-3,4))
|
|
c.move(p, x, y)
|
|
self.tk.update()
|
|
|
|
# Run -- never returns
|
|
def run(self):
|
|
while 1:
|
|
self.random_move(self.n)
|
|
|
|
|
|
# Main program
|
|
def main():
|
|
import sys, string
|
|
|
|
# First argument is number of pegs, default 4
|
|
if sys.argv[1:]:
|
|
n = string.atoi(sys.argv[1])
|
|
else:
|
|
n = 30
|
|
|
|
# Second argument is bitmap file, default none
|
|
if sys.argv[2:]:
|
|
bitmap = sys.argv[2]
|
|
# Reverse meaning of leading '@' compared to Tk
|
|
if bitmap[0] == '@': bitmap = bitmap[1:]
|
|
else: bitmap = '@' + bitmap
|
|
else:
|
|
bitmap = None
|
|
|
|
# Create the graphical objects...
|
|
h = Electrons(n, bitmap)
|
|
|
|
# ...and run!
|
|
h.run()
|
|
|
|
|
|
# Call main when run as script
|
|
if __name__ == '__main__':
|
|
main()
|
|
|
|
|