[Edu-sig] Brainstorming about January
urnerk at qwest.net
Mon Dec 13 06:42:20 CET 2004
> As far as I know there are a *lot* of graphics-Toolkits for Python out
> there. Which of them could be used for this task? What are your
> experiences? Do you have significantly faster solutions?
John's graphics.py has a tweak that significantly increases speed, by not
refreshing the screen with each change.
>From his source code:
# Version 2.1 1/15/04
# Added autoflush option to GraphWin. When True (default) updates on
# the window are done after each action. This makes some graphics
# intensive programs sluggish. Turning off autoflush causes updates
# to happen during idle periods or when flush is called.
Here's a program that takes about 30-50 secs to complete 500,000 loops, but
then almost as long again to actually paint the window.
The 10,000 loop takes a little over a second.
I have a 2.8 Ghz P4, gig of RAM.
I find using John's graphics.py (downloadable from his website) is a good
alternative to working directly with Tkinter. It's a façade, i.e. a wrapper
that simplifies the API.
My thanks to Bernie Gunn for a lot of this:
# Demo graphic of Sierpinskis Triangle with Graphics.py
from graphics import *
from random import randint
start = time.time()
# autoflush isn't well documented in Zelle's manual -- mentioned in source
# code comments. If set to false, window won't update with each new
# draw, meaning we get the 10,000 pixels to plot, THEN show them all
# at once. Set autoflush to True (default) for pixel-by-pixel rendering
# but in that case, suggest 100 or 1000, vs. 10000 pixels.
win = GraphWin("The Sierpinski Triangle",1280,1024, autoflush = False) #
shape = Rectangle(Point(10,10), Point(1270,970))
x = 500 # = centre of work screen
y = 360
col = 'orange'
Xd = 200
t = Text(Point(Xd,b2), ' .......A Genuine Sierpinski Triangle')
print "Working.... (please be patient)"
Triang = Polygon(Point(600,20), Point(200,720), Point(1000,720))
i = 1
while i < 500000: # you can play with this (make it smaller maybe)
sel = randint(1,3)
if sel == 1:
x = (600 + x) / man
y = (y + 20) / man
elif sel == 2:
x = (x + 200) / man
y = (720 + y) / man
x = (1000 + x) / man
y = (720 + y) / man
i += 1
end = time.time()
print end - start
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