Re: [Matplotlib-users] autoscale and "equal aspect" mode

Andrew,

Sure enough.  I did not pay a lot of attention to the zoom part of 
pan/zoom mode with fixed aspect ratio because it doesn't make much sense 
to me--it is trying to change the aspect ratio, while the aspect-ratio 
code is desperately trying to keep the aspect ratio fixed. The solution 
is probably to redefine what the right-button-event does in the fixed 
aspect ratio case. It should either be disabled, or arranged so that 
motion to the right and/or up zooms in and to the left and/or down zooms 
out.  What do you think it should do?

Left-button pan is definitely broken for horizontal motion.

I think what we have is not a single simple bug, but a whole set of 
bugs.  It seems to be difficult to fix one thing related to aspect-ratio 
handling without breaking something else for interactive drawing.  That 
probably means the overall design is bad.  When I can, I will take 
another look and see if I can patch it up, but it won't be right away. 
If you can find a solution, that would be great.

Eric



Andrew Straw wrote:
> I'm having trouble with axis('equal') myself -- I'm happy to take a look
> in the source, but maybe it's a simple and easy bug. The issue I'm
> having is readily apparent with examples/axis_equal_demo.py -- using the
> pan/zoom mode and holding the right-mouse button down to zoom, I notice
> several issues:
> 
> 1) moving left-and-right seems to affect the position, not the zoom level
> 2) moving up seems to zoom in (as expected)
> 3) moving down zooms out as expected, but past a certain point, only the
> vertical axis gets re-scaled and breaking the equal-aspect.
> 
> Eric Firing wrote:
> 
> 
>>Mike,
>>
>>I thought all the aspect handling was finally working correctly.  If
>>you generate a simple example, I will take a look.  The simpler the
>>better, of course.  I presume you are working with a recent svn version.
>>
>>Eric
>>
>>Michael P. Mossey wrote:
>>
>>
>>>I'm using this aspect mode:
>>>
>>>      axes.set_aspect( 'equal', adjustable='datalim' )
>>>
>>>With several xy line plots on the axes, autoscaling doesn't seem to
>>>occur properly. It cuts off part of the data. Is this a known issue?
>>>I don't have a simple script to replicate it---I'll have to pull that
>>>out of a larger program---but just wanted to check if it is known. I
>>>don't see anything in the bug tracker.
>>>
>>>Mike
>>>
> 
>