On Thu, Feb 10, 2011 at 1:38 PM, Matthew Turk <matthewt...@gmail.com> wrote:
> Hi there,
>
> I'm plotting some images in latitude/longitude space. These are
> images generated using the HEALpix method for discretizing the sphere,
> but I have resampled them to a regular grid of phi, theta, and the
> resultant image is contained in a variable img. This is a fully-self
> contained snippet:
>
> import matplotlib.figure
> import matplotlib.backends.backend_agg
> import numpy
> from numpy import pi
>
> img = numpy.random.random((800, 800))
> fig = matplotlib.figure.Figure((10, 4.9))
> ax = fig.add_subplot(1,1,1,projection='mollweide')
> image = ax.imshow(img, extent=(-pi,pi,-pi/2,pi/2), clip_on=False,
> aspect=0.5)
> cb = fig.colorbar(image, orientation='horizontal')
> canvas = matplotlib.backends.backend_agg.FigureCanvasAgg(fig)
> canvas.print_figure("hi.png")
>
> This makes a very nice looking figure, basically as expected: a black
> oval outline for the map projection with the image inside it, the
> lat/lon axes identified, etc. What I'm running into here is that I
> would like to fiddle with the size of the figure, to adjust the
> whitespace and the position of the colorbar and so on, but any
> adjustment to the height of the figure instantiation, for instance:
>
> fig = matplotlib.figure.Figure((10, 4.9))
>
> (and the rest unchanged) results in the black oval, the axes, but the
> image content is completely blank. Is this a bug, or just a subtlety
> I'm missing?
>
> Thanks for any ideas!
>
> Best,
>
> Matt
>
>
I am curious, why are you saving the figure using canvas.print_figure()?
How is it different from fig.savefig()? If you, for some reason, must use
canvas.print_figure(), then it seems like you are creating a new canvas from
the figure (I don't know, maybe it grabs figure's existing canvas
object?). In other words, you could just simply do:
fig.savefig("hi.png")
or, if you must use canvas.print_figure(), you could do:
fig.canvas.print_figure()
instead of the two lines you have right now.
See if that makes a difference.
Ben Root
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