QwtScaleEngine::Inverted has no effect (Qwt 6.1.2)

Hi

I recently upgraded Qwt to 6.1.2 (from 6.1.0).
For one of my QwtPlot-derived class, I tweak the 'yLeft' axis scale engine to be QwtScaleEngine::Inverted. It used to work, but not anymore (i.e. the axis is not inverted).

I tracked down

Code:

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QwtScaleEngine::Inverted

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usage in Qwt source code. The flag is tested in

Code:

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QwtLinearScaleEngine::autoScale()

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, but unfortunately the method is not called, eventhough I call setAxisAutoScale(yLeft, true) in constructor. I'm not sure why the method is not called. QwtPlot::setAxisScale() seems to disable AutoScale, but is not called until I use magnifier or zoomer for the first time.

Any idea ?

Is QwtScaleEngine::Inverted flag broken ?
Is it possible to have an QwtScaleEngine::Inverted axis with zoomer/magnifier/panner tools ?

Quote:

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Is QwtScaleEngine::Inverted flag broken ?

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Did a quick check with the simpleplot example: no problems there.

Quote:

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Is it possible to have an QwtScaleEngine::Inverted axis with zoomer/magnifier/panner tools ?

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Sure all of them preserve the direction of the scale.

When not using the autoscaler: setAxisScale( yLeft, 0, 10 ) is inverse to setAxisScale( yLeft, 10, 0 ) !

Uwe

I found what caused the problem

When data change, I want my view to fit contents. So I have a MyPlot::resetZoom() method, which used to be like this :

Code:

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void MyPlot::resetZoom(const QRectF & rect)
{
	p_zoomer->zoom(rect);	
	p_zoomer->setZoomBase(rect);
	p_zoomer->zoom(0);	
}

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and is called like this :

Code:

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resetZoom(some_curve->boundingRect());

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But I never quite understood the zoomer behaviour, and what to call to setup zoom level properly.
I just changed my code to not use a QwtPlotZoomer anymore (but still a magnifier), and modified resetZoom() method :

Code:

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void MyPlot::resetZoom()
{
    setAxisAutoScale(xAxis(), true);
    setAxisAutoScale(yAxis(), true);
    replot();
}

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And it's ok now.

Some day I'll try to better understand all this stuff