On Sat, Apr 26, 2008 at 2:04 PM, Eric Firing <[EMAIL PROTECTED]> wrote:
> The attached script, run on svn mpl, illustrates a positioning problem: note
> that the subplot titles are badly positioned in the 50 dpi version. I
> believe that changing from 150 to 50 dpi should yield a perfect scaling of
> everything in the plot, but it doesn't. There is a similar problem with a
> quiver key positioned outside the axes frame, but I don't have a trivial
> example yet; I am hoping that whatever solves the title positioning problem
> will take care of that also. If not, I will make a simple example and we
> can attack it separately.
There were two problems with title positioning. The first was that
the title offset transformation was hardcoded in pixels and not dpi,
and the second was that is was not getting notifed when the figure dpi
was changed. I changed the offset to read:
self.titleOffsetTrans = mtransforms.Affine2D().translate(
0.0, 5.0*self.figure.dpi/72.)
and added a callbacks registry to the figure instance so that
observers could be notified when dpi was changed (dpi used to be a
lazy value on the maintenance branch but is a plain-ol-value on the
trunk).
def on_dpi_change(fig):
self.titleOffsetTrans.clear().translate(
0.0, 5.0*fig.dpi/72.)
self.figure.callbacks.connect('dpi_changed', on_dpi_change)
It looks like the problem in the quiver code is that the "labelsep"
property reads the dpi when the QuiverKey is intiitalized but does not
get notified on dpi change. I added a callback there too so you
should test to see if this helps. The dpi setting is also referenced
in the _set_transform method. Since you are more familiar with the
quiver code that I am, and this hint may point you in the right
direction, I'll let you take a look at that and see if a callback is
needed.
On a related note, one trick I use when debugging text layout problems
is to turn on the "bbox". If the bbox is right but the text is in the
wrong place, you know it is in the layout. If the bbox is in the
wrong place, you know the problem is in the font metrics:
boxprops = dict(facecolor='red')
ax1.set_title('Top Plot', bbox=boxprops)
JDH
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