[Qgis-developer] Qwt widgets in Qgis

[Tim Sutton]

Hi

I think Qwt is in there by accident rather than by design. QGIS itself
doesnt have any dependency on Qwt and I dont think there are any plans
to add this as a requirement for 1.0.

Regards

Tim

2008/5/11 Barry Rowlingson <b.rowlingson at lancaster.ac.uk>:
>
>   I just noticed that Qgis (0.10.0-Io, Windows XP) seems to have the Qwt
>  widget stuff included, including Python bindings.  Thought this might be
>  useful, so I started playing with it in a Python command line.  Qwt lets
>  me do stuff like this to get a blank X-Y plot - this works fine from a
>  DOS command-line Python:
>
>    from PyQt4.QtCore import *
>    from PyQt4.QtGui import *
>    app=QApplication([])
>    import PyQt4.Qwt5
>    myPlot = PyQt4.Qwt5.QwtPlot()
>    myPlot.show()
>
>   but if I try that from the QGis Python console (actually, just the
>  last three lines, don't do QApplication() from the console), Qgis
>  crashes out when I call QwtPlot() to instantiate a plot object.
>
>   There's some differences: my command-line python is 2.5.1 and my qgis
>  python is 2.5.2. Versions of Qwt5 are the same (5.0.2) and my pythons
>  are getting Qwt5 from the right places - Qgis gets it from its python
>  folder, and command-line python gets it from C:\\Python25\\blahblabla.
>
>   Does this happen to anyone else on this or other platforms?  And also,
>  is there a guarantee that Qwt will be available in Qgis releases?  It
>  does look handy for scientific applications - not just the plots, there
>  are some useful widgets in there too (floating point sliders ftw!).
>
>  Barry
>
>  #irc: spacedman
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Tim Sutton
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