Hello NG,
I haven't stated my question very clearly, probably. I
am trying to use imshow() with a dinamically changing set of matrices.
What my application does, is just to respond to a user selection from
awxPython radiobutton and, based on the user's choice, display a
different matrix on a matplotlib figure (I am using the OO interface).
I also have an horizontal colorbar to let the user orient himself over
the matrix values. Well, these matrices have different magnitues in
value, and I was expecting that the colorbar would be updated with the
new image data.
Isn't the colorbar supposed to update when the input
image/pcolor/whatever changes?
I attach a modified example of
dynamic_image_wxagg2.py that demonstrates the problem: the values in
the image increase, but the colorbar stays quiet at its bounds
(0.0,2.0) and ends up filled only with blue...
Does anyone have a
suggestion?
Thank you.
Andrea.
dynamic_image_wxagg2.py (3.82 KB)
Andrea,
I agree, the colorbar should dynamically update. A workaround might be to simply call colorbar every time you update the image data.
At least part of a longer-term solution may be to change colorbar so that instead of always using contourf, it uses imshow when it is being used with a nearly continuous set of colors instead of a small discrete set.
I have not had time to look at this closely, but I can add it to my list.
Eric
andrea_gavana@...517... wrote:
···
Hello NG,
I haven't stated my question very clearly, probably. I am trying to use imshow() with a dinamically changing set of matrices.
What my application does, is just to respond to a user selection from awxPython radiobutton and, based on the user's choice, display a different matrix on a matplotlib figure (I am using the OO interface). I also have an horizontal colorbar to let the user orient himself over the matrix values. Well, these matrices have different magnitues in value, and I was expecting that the colorbar would be updated with the new image data. Isn't the colorbar supposed to update when the input image/pcolor/whatever changes?
Eric Firing wrote:
Andrea,
I agree, the colorbar should dynamically update. A workaround might be to simply call colorbar every time you update the image data.
At least part of a longer-term solution may be to change colorbar so that instead of always using contourf, it uses imshow when it is being used with a nearly continuous set of colors instead of a small discrete set.
I have not had time to look at this closely, but I can add it to my list.
Eric
Although updating the colorbar when the image data changes should be the default behaviour will there be a way to keep the colorbar from changing? I've got a visualization application where an image changes according to the position it's currently displaying but I want to keep the colorbar that reflects the largest value. Right now I just display first the image that has the largest value and the colorbar stays the same. Whatever the buggy behaviour an application has someone is taking advantage of it 
João Silva
It sounds like there are two questions here: whether the colorbar correctly tracks the actual color mapping used in the image or contour plot or whatever (it should always do this, but I think that at present it does not), and whether the limits should change even if the mapping does not. I think the behavior you request is sensible, so that would be my target, either as a standard behavior or as an option. Thanks for pointing out this aspect of the problem.
There is another problem with the colorbar code, and I have been trying to decide how to handle that before looking at the update question, so I have not resolved either one yet.
Eric
João Luís Silva wrote:
···
Eric Firing wrote:
Andrea,
I agree, the colorbar should dynamically update. A workaround might be to simply call colorbar every time you update the image data.
At least part of a longer-term solution may be to change colorbar so that instead of always using contourf, it uses imshow when it is being used with a nearly continuous set of colors instead of a small discrete set.
I have not had time to look at this closely, but I can add it to my list.
Eric
Although updating the colorbar when the image data changes should be the default behaviour will there be a way to keep the colorbar from changing? I've got a visualization application where an image changes according to the position it's currently displaying but I want to keep the colorbar that reflects the largest value. Right now I just display first the image that has the largest value and the colorbar stays the same. Whatever the buggy behaviour an application has someone is taking advantage of it
João Silva
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