Hi Ryan,
The Axes in the svn version of the mpl has a "axes_locator" property ,
which is meant to be used to update the location of the axes at the
drawing time.
Try to insert the following code before the "show" and see if it works for you.
from matplotlib.transforms import Bbox
def update_pos(cbar_axes, renderer):
cpos = list(ax.get_position().bounds)
cpos[-1] = colorbar_height
return Bbox.from_bounds(*cpos)
cax.set_axes_locator(update_pos)
Also, you may be interested in the "axes_grid" toolkit that I recently
checked in to the trunk, although it would be a bit more tricky to
place the colorbar at the bottom of the axes. Anyhow, you may take a
look at "examples/axes_grid/demo_axes_divider.py".
Regards,
-JJ
On Thu, Apr 23, 2009 at 6:12 PM, Ryan May <rma...@gmail.com> wrote:
> Hi,
>
> I'm trying to make a colorbar that occupies the bottom extent of an axes:
>
> import numpy as np
> import matplotlib.pyplot as plt
> from matplotlib.colorbar import ColorbarBase
> from matplotlib.colors import Normalize
>
> colorbar_height = 0.02
>
> data = np.random.randn(10,10)
> fig = plt.figure()
> ax = fig.add_subplot(1, 1, 1)
>
> norm = Normalize(-4, 4)
> cmap = plt.get_cmap('spring')
>
> ax.imshow(data, norm=norm, cmap=cmap)
>
> cpos = list(ax.get_position().bounds)
> cpos[-1] = colorbar_height
>
> cax = fig.add_axes(cpos)
> cbar = ColorbarBase(cax, norm=norm, cmap=cmap, orientation='horizontal')
> cax.xaxis.set_ticks_position('
> top')
> cax.xaxis.set_ticks_position('both')
>
> plt.show()
>
> The problem is, because this is an image, at draw time, the axes aspect
> ratio (and hence its bounds) get updated, but the colorbar does not get this
> update. This produces a colorbar much longer than the actual extent of the
> axes. (See attached.) Is there a way to give the colorbar axes a bbox that
> is modified but still linked to the axes bbox? Or is there a way to force
> the axes to update its bbox before being drawn? I showed off a version of
> this code that worked great in the interactive shell earlier, but I'm having
> an epic fail at getting this to work within a script. I've taken this same
> approach before, but I think I've just been lucky in how the axes aspect
> ratio was handled.
>
> Ryan
>
> --
> Ryan May
> Graduate Research Assistant
> School of Meteorology
> University of Oklahoma
> Sent from Norman, Oklahoma, United States
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