QwtPlot Canvas Size Hint?

Hi All,

I have 3 QwtPlot in vertical layouted widget as you can from attached screenshot. When I zoomen in or out in my any canvas as you expect that scales changes so layout sizes changing too. Then my end-to-end alignment in each QwtPlot is breaking down.

At this point, how can set my canvas size fixed. So my all 3 canvas left and right point lined up on same line.

Thanks in advance.
Regards.

If you are not looking for a dynamic solution, you can setMinimumExtent of the left side of the axis to a higher number.

For example, p->axisScaleDraw ()->setMinimumExtent (80);

And if you are looking for a dynamic solution use QwtScaleDraw::extent() from all left axes to calculate the value for the minimum extent.

Uwe

In order to use extent(), one must know the currently used QFont and QPen.

Figuring out the QFont is easy:

Code:

---

self.plot.axisFont(axis)

---

, but how can I figure out the QPen used?

http://qwt.svn.sourceforge.net/viewv...22&view=markup

Uwe

Thanks, but that seems qwt trunk version.
QwtScaleDraw::extent takes 2 parameters (as of http://qwt.sourceforge.net/class_qwt...6501cc5ff290c6), and I do not know from where to get the QPen.

Code:

---

QPen( Qt::color1, axisWidget(..)->penWidth() );

---

The color doesn't matter.

Uwe

Hi I've 4 QwtPlots in a layout similar to u. I want to plot diffrent waves, but i am not able to plot diffrent waves. Its plotting the latest one in all 4 QwtPlots. Can u please help me solving this. Thanks in advance

Kishore

Maybe you're setting the same data on all the plots?

Show some code then it'll be easier to say.