Re: [Matplotlib-users] Animation and imshow

[Michael <mna...@bl...>]

loop through the data and call clf():

from pylab import *
from numpy import *

ion()
hold(False)

frame1 = zeros((200, 200))
frame1[20:40, 20:40] = 255

frame2 = zeros((200, 200))
frame2[20:40, 30:50] = 255

frame3 = zeros((200, 200))
frame3[20:40, 40:60] = 255

frame4 = zeros((200, 200))
frame4[20:40, 50:70] = 255

frame5 = zeros((200, 200))
frame5[20:40, 50:70] = 255

data=[frame1,frame2,frame3,frame4,frame5]

for frame in data:
    m=imshow(frame)
    m.set_data(frame)
    clf()
show()
#close() 

> Message: 2
> Date: Tue, 7 Oct 2008 15:10:30 +0200
> From: "Alexander Borghgraef" <ale...@gm...>
> Subject: [Matplotlib-users] Animation and imshow
> To: mat...@li...
> Message-ID:
> 	<9e8...@ma...>
> Content-Type: text/plain; charset=ISO-8859-1
> 
> I'm trying to figure out how to do animated graphics in pylab using
> imshow, so I made this little 'hello world' equivalent showing a
> moving square over two frames.
> Problem is I have to call draw twice to refresh the image. Anyone can
> explain why this is so (and how to do this more elegantly)? This is
> the code:
> 
> from pylab import *
> from numpy import *
> 
> ion()
> hold(False)
> 
> frame1 = zeros((200, 200))
> frame1[20:40, 20:40] = 255
> 
> frame2 = zeros((200, 200))
> frame2[20:40, 30:50] = 255
> 
> m = imshow(frame1)
> draw()               # shows frame1
> m.set_data(frame2)
> draw()               # still shows frame1!!!
> draw()               # and now it shows frame2!??
> 
> 
> -- 
> Alex Borghgraef
> 
> 

-- 
"When you think of the long and gloomy history of man, you will find far
more hideous crimes have been committed in the name of obedience than
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