Quoting John Hunter:
> Alternatively you can connect to the figure dpi_changed event -- there is
> an example in Axes.cla
Regarding that example, each call to Axes.cla connects a new dpi_changed
callback, but, as far as I can tell, the callback is never disconnected.
Thus, each cla call augments the dict of dpi_changed figure callbacks:
fig = figure()
ax = fig.add_subplot(1, 1, 1)
print len(fig.callbacks.callbacks['dpi_changed']) # only 1
for n in range(7): ax.cla()
print len(fig.callbacks.callbacks['dpi_changed']) # now 8
Should cla store the connection id and, if there is a stored id from a prior
call, disconnect the previous callback before connecting the new one?
Stan
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