On Wed, Jul 11, 2012 at 8:35 AM, Wolfgang Draxinger <
wdraxinger.maill...@draxit.de> wrote:
> Hi,
>
> I have a plot of an image of which I'd like to interactively select a
> quadrilateral. This is for a homography operation (perspective
> correction). It suffices if the quadrilateral can be dragged by only
> its vertices (display the vertices as rects or circled to click within).
>
> In principle I want to implement a tool similar to the
> "Perspective" tool of The GIMP in corrective mode. The whole image
> processing and geometric transformation is already implemented, but now
> I need a user interface. Since I'm already making heavy use of
> Matplotlib I'd like to stay within this.
>
> After the user applied the homography the next step is placing the
> calibration markers, which would be basically one axvline and two
> axhlines to be dragged to reference points on the previously
> perspective corrected image.
>
> How do I implement such interaction elements?
>
>
> Wolfgang
>
>
Hi Wolfgang,
You can find a decent start to this in the event handling examples. The
poly editor demo is particularly useful:
http://matplotlib.sourceforge.net/examples/event_handling/poly_editor.html
Awhile back, I wrote a tool for my own work. It probably needs a little
cleanup, but it works. I've posted it as a gist if you want to try it out:
https://gist.github.com/3090704
At some point, I had problems with it on certain backends, so you may need
to uncomment the 'tkagg' line. In any case, it seems to work fine with my
current backend (qt4agg).
Cheers,
-Tony
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