Hi, I have written a basic QtAgg backend for
> Matplot-lib. It is only tested on Windows, so some more
> testing should be done, but it is my hope that it can some
> day be included in the matplotlib distribution. I will test
> on linux when I get the time, but all the code is python so
> it should probably work ok.
Indeed -- it's a testament to QT and python that the untested code
appears to run the same on linux (per Steve's report) and OS X, which
I tested today. Good work!
> See http://www.tjora.no/python/matplotlib/ for the code.
> Most examples run ok, but the keypress_demo.py does not
> work yet. Not all examples have been tested, just some
> random double-clicking on the one that look interesting.
I think the problem here was that you had
def keyPressEvent(self, ev):
self.keyPressEvent(ev.text())
def keyReleaseEvent(self, ev):
self.keyReleaseEvent(ev.text())
where you meant
def keyPressEvent(self, ev):
self.key_press_event(ev.text())
def keyReleaseEvent(self, ev):
self.key_release_event(ev.text())
I made these changes in CVS, and the keypress_demo indeed works.
> A lot of the comments from the backend_template.py has not
> been removed or fixed. The code is also somewhat rough
> around the edges, but it works.
> Is there any unittest-suite it is possible to run the
> backend against?
The standard test suite is examples/backend_driver. You just need to
set the "backends" list to the list of backends you want to test. Eg
backends = ['QtAgg']
> Feedback is welcome.
I agree with most of the comments Steve made.
* I think factoring the class into a module that handles the qt
widgets, and have a small module that does qtagg would be a good
thing. Steve would likely do a qtcairo backend if you did this...
* The only explanation I can think of for why the colors are wrong
is that qt has a different byte order for images than you are
getting from agg (is could it be bgra instead of rgba, or that
something is wrong with the endianess...) If you need a different
byte ordering /pixel format, I can provide the required method in
the agg backend. I note that the saved figures *do* have the
right color scheme, which supports this idea.
* The control key modifier is apparently not recognized -- this
provides aspect ratio preserving zoom. I can't test any of the
right click drag functionality right now, actually, since I'm on a
mac w/o an external mouse plugged in **&$$ macs!
Thanks!
JDH