matplotlib-users Mailing List for matplotlib

Greetings,
I've been trying to build a "stripchart" with matplotlib as part of a 
larger PyGTK application. I have rebuilt one of the examples as a GTK 
window class, but it doesn't seem to update unless it is resized. Any ideas?
Thanks,
-carson-

Apologies, but as usual, I'm under a bit of pressure to display a pcolor
using a custom colormap and it's not intuitively obvious how to do it (but
I'll keep looking). If there's a kind soul out there who can quickly point
me/show me how, I'd appreciate it. In my simple example, I want to have
just 4 bands of color: 2 shades of blue for all negative scalar values and
2 shades of red for all positive values.
thanks, Randy

On Jan 3, 2005, at 7:36 PM, Stephen Walton wrote:
> Stephen Walton wrote:
>
>> second would be a windowed, scrollable view into an image which is 
>> larger than the physical display.
>
> Actually, imshow seems almost to do this. I did
>
> imshow(imdata,interpolation='nearest')
>
> where imdata was a 1024 square image. Zooming and panning _seems_ to 
> show the full resolution image with individual pixels visible at high 
> zooms. Is this right?
>
Since John is away, if I interpret your question correctly, yes. Both 
implot and figimage save a reference to the original image so that when 
redisplayed, it is possible to do things like that (like expanding the 
size of a figimage window will show all pixels previously falling 
outside the bounds).
Your previous request regarding adding scrollable plot regions raises 
an interesting issue. I think this is tricky (John may prove me wrong 
on this). It was this sort of functionality that made chaco 
comparatively complex so I'm hesitant about adding it. Effectively one 
now one would be wandering into the area of having the plotting package 
begin to emulate widgets within its canvas (e.g., the scroll bars).
This doesn't mean that one couldn't write a gui application that had 
scroll bars that responded to scroll events by redisplaying the image 
(and plot) according to their position. But then it becomes gui 
dependent. Paul Barrett's suggestion to do a DS9 clone would likely 
take this approach I think.
As you noticed, the general toolbar gives some of this functionality, 
but I don't know if will satisfy all such needs that something like DS9 
does.
Perry

Hi,
On Wed, 5 Jan 2005, Ben Vanhaeren wrote:
> Hello,
>
> I'm trying to generate an animated plot embedded in gtk. The problem I have is
> that the plot only gets drawn when the animation loop is finished instead of
> everytime the draw() function is called inside the loop. Is there any other
> way to force the plot to be redrawn ?
From your description I suspect that you have a loop in
a subroutine which does one plot after another. However,
doing it this way does not leave gtk any opportunity to
refresh the corresponding window.
In the example of a moving sine
 http://matplotlib.sourceforge.net/examples/anim.py
John remarks that one has to
"""
# turn interactive mode on for dynamic updates. If you aren't in
# interactive mode, you'll need to use a GUI event handler/timer.
"""
Maybe you can use something from the mov_sin_mpl_gtk.py example,
http://sourceforge.net/mailarchive/forum.php?thread_id=6175425&forum_id=33405
I for myself haven't use embedding in gtk, so maybe someone
else has a working example...
Best,
Arnd

Hello,
I'm trying to generate an animated plot embedded in gtk. The problem I have is 
that the plot only gets drawn when the animation loop is finished instead of 
everytime the draw() function is called inside the loop. Is there any other 
way to force the plot to be redrawn ?
Best regards,
Ben Vanhaeren 

I'm getting confused about meaning of shape parameter
of arrays used in a pcolor plot...
xarray= [ 0. 1.25 2.5 3.75 5. 0. 1.25 2.5 3.75 5.
0. 1.25 2 .5
 3.75 5. 0. 1.25 2.5 3.75 5. ]
yarray= [500 500 500 500 500 600 600 600 600 600 700 700 700 700 700
800 800 800 80 0
 800]
zarray= [...etc.]
This will create a proper pcolor plot with 4 rows and 5 columns
if I set all 3 array 'shapes' to be (4, 5).
What is confusing me is that if I want to SWAP xarray and yarray
in order to create a plot with 5 rows and 4 columns then
I MUST STILL SET 'shapes' TO BE (4,5).
'shapes' OF ARRAYS DOESN'T EQUAL DIMENSIONS OF PLOT!?!?
*This* is what is confusing me. I'm not sure what array 'shape'
means if it doesn't mean (# plot rows, # plot columns).
Any help greatly appreciated.
Sincerely,
Chris
--
_______________________________________
Christian Seberino, Ph.D.
SPAWAR Systems Center San Diego
Code 2872
49258 Mills Street, Room 158
San Diego, CA 92152-5385
U.S.A.
Phone: (619) 553-9973
Fax : (619) 553-6521
Email: seb...@sp...
_______________________________________

pcolor function gives a nice color plot when user supplies
a list of triplets. e.g. [ (1,2,3), (4,5,6), ... ].
I usually try to supply these points such that the points
are in some *order* and on a regular *lattice*.
Are there any issues with supplying points in any random
order that aren't evenly spaced but completely random
in position as well?
Chris
--
_______________________________________
Christian Seberino, Ph.D.
SPAWAR Systems Center San Diego
Code 2872
49258 Mills Street, Room 158
San Diego, CA 92152-5385
U.S.A.
Phone: (619) 553-9973
Fax : (619) 553-6521
Email: seb...@sp...
_______________________________________