How to force plot grid to follow top axis?

[Sintegrial]

Thank you a lot Uwe!

That was really stupid question, I should have look at QwtPlotItem interface of course

Could you please tell is it also possible to get an axis with a non-regular scale?
I.e. when the ticks are defined in a complete arbitrary way, say, by a table or so on.
Playing around with QwtTransform did not bring a lot, actually.
Or there is another approach to achieve this?

btw, Qwt is great

[Uwe]

Could you please tell is it also possible to get an axis with a non-regular scale?

When there is no rule use QwtPlot::setAxisScaleDiv(), otherwise the rule has to be implemented somehow using QwtScaleEngine/QwtTransform.

Uwe

[Sintegrial]

I've tried to use setAxisScaleDiv() as a very simple test, like that:

QwtScaleDiv scaleDiv(0.0, samplesCount);

m_plotPtr->setAxisScaleDiv(QwtPlot::xBottom, scaleDiv);
m_plotPtr->enableAxis(QwtPlot::xBottom, true);

but unfortunately the bottom axis disappears after these lines

[Sintegrial]

Ok, found the reason: when there are no ticks set, the scala will not be drawn.
Thank you again Uwe!