Thanks a lot, Ben!!!
With using the mplot3d/pbaspect branch, my plot shows exactly what i asked
for a few hours(!) ago. Nothing ugly here :)
I'll keep track of that branch and can at least contribute by testing.
Richard
2011/6/9 Benjamin Root <ben.r...@ou.edu>
>
>
> On Thu, Jun 9, 2011 at 10:13 AM, Benjamin Root <ben.r...@ou.edu> wrote:
>
>>
>>
>> On Thu, Jun 9, 2011 at 6:25 AM, Richard Hofmeister <
>> richard.hofmeis...@io-warnemuende.de> wrote:
>>
>>> Hello mplot3d specialists,
>>>
>>> I would like to change the aspect ratio of the 3d axes similar to
>>> matlab's functionality with daspect() or the 'dataaspectratio' property of
>>> 3d-axes.
>>> In the end, the x-y-plane should be non-square due to different lengths
>>> (not range) of the x and y axis (i know that i can use the aspect property
>>> of the axes to set the x-z/y-z aspect ratio).
>>>
>>> There is also the package "scitools", which provides all the matlab-3d
>>> functions including daspect via a VTK-backend; that would be my next try.
>>>
>>> For the simple 3d-plotting without fancy shading, i would like to stick
>>> to mplot3d:
>>> Is it possible to change the axis lengths/aspect ratios independently?
>>>
>>> Richard
>>>
>>>
>> Richard,
>>
>> Good question. I have never thought about such a feature for mplot3d.
>> Looking back at the code, it does not appear to be feasible to do in its
>> current state, as the code seems to assume that the 3d grid is a constructed
>> from a unit cube. However, I will see if I can add aspect multipliers to
>> the point calculation and get arbitrary aspects. Maybe I can get that
>> feature added into the upcoming 1.1.0 release.
>>
>> Ben Root
>>
>>
> Richard,
>
> I took a look at how this might be implemented. There would have to be
> some extra work to make the plots look right when experiencing changes in
> aspect. I first tried an implementation of just the plot box aspect ratio
> (pbaspect) as a member variable of the axes object. It will probably turn
> into a property so that I can link it with a daspect value. Also, the
> values should be normalized to 1, unless you want to see some interesting
> shrinkage/growth of your plot area.
>
> Try my branch here:
> https://github.com/WeatherGod/matplotlib/tree/mplot3d/pbaspect
>
> After building that branch, try the following script (shamelessly adapted
> from some Matlab help pages for pbaspect and daspect).
>
> import matplotlib.pyplot as plt
> from mpl_toolkits.mplot3d import Axes3D
> import numpy as np
>
> fig = plt.figure()
> ax = fig.gca(projection='3d')
>
> x, y = np.mgrid[-2:2:.2, -2:2:.2]
> z = x * np.exp(-x**2 - y**2)
> ax.plot_surface(x, y, z, rstride=1, cstride=1)
> ax.pbaspect = [1.0, 1.0, 0.25]
> plt.show()
>
> While this will squash the z-axis nicely, it does not force the z-ticks to
> be pruned, so it gets a little ugly. However, the axis ticks can be changed
> manually. Also, with some of my other changes coming soon, it should be
> possible for the Axes3D object to automatically adjust the spacing of the
> tick labels so that it is not impacted by the changes in aspect ratio in the
> perpendicular direction (i.e. - the x and y tick labels are closer to the
> axis due to the z-axis scaling).
>
> Keep an eye on that branch as I work to improve this feature, and feel free
> to contribute to it as well!
>
> Ben Root
>
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