Re: [Visualpython-users] Creating .png files in Linux

[Kadir H. <kha...@ya...>]

Lorenzo Isella wrote:

> I 
managed 
to 
get 
some 
decent 
animations 
on 
my 
laptop 
(running 
Debian
> testing); 
now 
my 
question 
is 
how 
to 
get 
at 
least 
a 
set 
of 
png 
(or 
any
> other 
decent 
format; 
pdf, 
eps, 
jpg 
etc...) 
files 
with 
the 
"snapshots"
> of 
my 
system.

I can answer your question for Windows environment. Same or similar solution MAY or 
MAY NOT apply for Linux, I have no experience in Linux environment.

First you need to install Python Image Library, PIL, if you have not done so
already. You may be using it already, if you are using TEXTURE feature of
the recent Beta versions of VPython.

Then in your source code you need to add some lines, like the followings:

import Image
import ImageGrab
...

Your animation code goes here

...

while looping:

        im = ImageGrab.grab((24,30,ImageWidth-4,ImageHeight-4))
        fn = "Cat"+str(pn)+".png"
        im.save(fn)

fn is the filename in Windows environment. 

IF THIS SYSTEM WORKS in LINUX, then someting similar to that of filename should be sufficient.
ImageGrab needs the display location (upper-left corner) and display sizedefined to it, so it picks up
the image from the screen for you.

You need to set up some sort of a counter in the loop like the str(pn), to get a unique
file name for each snapshot.

Hope it works...

Kadir





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