Export SVG: Qwt Bug?

[giusepped]

I think there is a bug, which is easily checked by using the bode example.

If you put his line in the constructor of bode_cpp

setAxisScale(QwtPlot::yLeft,0,40);

setAxisScale(QwtPlot::yLeft,0,40);

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by forcing the y scale to be from 0 40, and if you then export in SVG,
you will see that the plot is painted outside the canvas in the svg file.
It seems that values behond the limit set by setAxisScale() are handled in the wrong way.
Uwe, do you agree?

[giusepped]

Nobody checked this error? It is very important to get svg file in the correct form....
G

[Uwe]

Looks like the svg paint engine ignores clipping at all. Looking into Qt 4.5.0 beta I can't see any new code, so it doesn't seem to be on the TODO list of the Qt developers.

If you enable QwtPlotCurve::ClipPolygons, the curves are clipped against the paint device boundaries ( QPainter::window() ). Then you have to patch qwt_plot_curve.cpp, so that the canvasRect is used instead of painter->window().

Uwe

[giusepped]

Why not submitting a patch to Qwt in the subversion ?
G

[giusepped]

Moreover, for me is quite hard to understand where to patch...may you be more detailed...?
G