I have some figures with multiple axes stacked on top of each other,
generated with Figure.add_subplot(). In each figure, some sets of these
axes are logically grouped together, and I need some visual clue of which
axes are more closely related.
The right way is probably to use GridSpec [
http://matplotlib.sourceforge.net/users/gridspec.html] and add some
additional wspace.
Instead, I attempted to just add some lines between the logical groups of
axes (code below), generated from the bounding boxes of the axes, and
drawing the lines halfway between.
There are probably many things wrong with this code. :) If I use 'figure
pixels' (red lines), the displayed figure looks great, but the lines move
to different places in the saved PNG file. I'm guessing this is the result
of rcParams.update({'savefig.dpi': 300.0}). If I use 'figure points' (green
lines), the lines show up in the same place both in the display and saved
file. Is there a different function I should be using to get the bounding
box edges, or to convert between the figure pixels and points?
Thanks,
Justin
---
f = figure()
map(lambda i : f.add_subplot(10, 1, i), range(1,10)) # make subplots
do_lines_after = [1,3,5,7] # draw lines after these axes (indexes)
def group_axes(f, do_lines_after, color='red', coords='figure pixels'):
boxes = [ax.bbox.get_points() for ax in f.axes] # get bounding boxes
for ax_index in do_lines_after:
if ax_index < (len(boxes) - 1):
(x0, y1), (x1, _) = boxes[ax_index] # y1 -> bottom of upper axes
y0 = boxes[ax_index+1][1][1] # y0 -> top of lower axes
y = y0 + (y1 - y0)/2.0 # halfway in between the two axes
dict(arrowstyle='-', facecolor=color, edgecolor=color)
ax.annotate('', xy=(x0*0.3, y), xytext=(x1*1.01, y),
arrowprops=arrowprops, xycoords=coords,
textcoords=coords)
return
group_axes(f, do_lines_after, 'red', 'figure pixels')
group_axes(f, do_lines_after, 'green', 'figure points')
f.canvas.draw() # pixels/red look good, green notsomuch
f.savefig('test.png') # green in the same place; red is somewhere else now
(based on dpi?)
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