Qwt with QWidget or QGraphicsView+QGraphicsScene

Hello!

I want to show a QwtPlot 2D graphic in my Qt application (and I'm using the UI interface for that). In previous software, what I did was I created a personal class with QwtPlot inherited and used the function setParent() pointing to a QWidget inside the UI interface.

But I noticed that the QGraphicsView + QGraphicsScene provides some painting functionality that simple QWidget don't provide, so I figured out, if it turned to be necessary, that probably it would be better if I connected the QwtPlot not with a QWidget, but with a QGraphicsView/QGraphicsScene so I could use not only the functions Qwt provide, but also what QGraphicsView/Scene provides.

I would like to know, given this desire, what are the advantages/disavantages of linking a QwtPlot to a QGraphicsView instead of a QWidget, what can I loose and if my previous, written thoughs are correct. Notice that I don't want only to plot, but to use many "special" functionality for the QwtPlot such as zoom and pan.


Thanks,


Momergil

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Originally Posted by Momergil

I would like to know, given this desire, what are the advantages ...

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When you are trying to use OpenGL you might find a way to tunnel QWidgets ( here Qwt widgets ) by using the OpenGL mode of the QGL canvas. Never tried this hack myself, but I wouldn't expect that it works out of the box.

Beside this I wouldn't expect anything useful from stacking Qwt and QGV as both are on the same level of abstraction ( somewhere between QPainter and QWidget ).

Uwe

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Originally Posted by Uwe

When you are trying to use OpenGL you might find a way to tunnel QWidgets ( here Qwt widgets ) by using the OpenGL mode of the QGL canvas. Never tried this hack myself, but I wouldn't expect that it works out of the box.

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To be sincere I'm not sure if I understood what you mean in this explanation.

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Beside this I wouldn't expect anything useful from stacking Qwt and QGV as both are on the same level of abstraction ( somewhere between QPainter and QWidget ).

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Hmm, Ok. But does this garantee to me that all functionality that QGV+QGS provides will be avaliable if I stack Qwt in a QWidget?*


Now, given you mentioned OpenGL and some days ago I was studying what would be better to use to display graphics in my software - Qwt or OpenGL -, could you also say to me if there is the possibility to use OpenGL functions inside a QwtPlot? Let's imagine that I want to do something that Qwt classes/functions don't do or don't do very well while OpenGL offers exactly what I need. Is there a way to work with both of them in the same plot?

Thanks!

Momergil


*Notice that my greatest interest in using QGV+QGS by now is to be able to use the write text function in the Qt example Diagram Scene.

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To be sincere I'm not sure if I understood what you mean in this explanation.

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Then it is of no importance for you.

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Ok. But does this garantee to me that all functionality that QGV+QGS provides will be avaliable if I stack Qwt in a QWidget?*

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Of course not - stacking Qwt on QGV doesn't offer you to put QGraphicsItems on the plot canvas or QwtPlotItems on the QG scene. You can't have Qwt and QGV features together.

Uwe

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Originally Posted by Uwe

Then it is of no importance for you.


Of course not - stacking Qwt on QGV doesn't offer you to put QGraphicsItems on the plot canvas or QwtPlotItems on the QG scene. You can't have Qwt and QGV features together.

Uwe

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Hmm, ok. And what about OpenGL and Qwt together?


Momergil