On Tue, Sep 16, 2008 at 9:00 PM, John Hunter <[EMAIL PROTECTED]> wrote:
> Oops, wait, I answered too fast. The figure.dpi *was* already used in
> the cache key and the renderer.dpi, which I just added, is not
> guaranteed to exist (depending on the backend). I need to figure out
> why the figure.dpi in the cache key is not sufficient ....
OK, I see what is going on. Actually, nothing is broken (feature not
bug, though admittedly confusing). In savefig, the renderer saves the
display dpi, sets the savefig dpi on the figure and renderer (as
necessary) instances, draws the figure, and then restores the display
dpi. Outside of savefig therefore, all you see when calling
get_window_extent is the display dpi. What you need to do is hook
into the drawing so you can get the window extent when the canvas is
drawn by savefig, when the savefig dpi is set. The script below shows
that before and after savefig, you get the display dpi extent, but in
the draw event you get the savefig dpi. If this is too onerous and
you know you will be using an image backend, just set the rc figure
and savefig dpi to be the same.
import matplotlib as mpl
mpl.use('agg')
import matplotlib.pyplot as plt
fig = plt.figure()
t = plt.text(0.5, 0.6, 'testing')
print 'before save window extent', t.get_window_extent().extents
def ondraw(event):
print 'on draw window extent', t.get_window_extent().extents
fig.canvas.mpl_connect('draw_event', ondraw)
fig.savefig('/tmp/t150.png', dpi=150)
print 'after save window extent', t.get_window_extent().extents
plt.show()
JDH
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