Qwt Plot Grid and Plot Background problem when updating qwt 5.2.3 to 6.1.6

[olredi]

I updated the Qwt version from 5.2.3 to 6.1.6 and the Plot Grid and Plot Background are not visible anymore in the plot.

I have classes that reimplements the draw method:

class PlotGrid : public QwtPlotGrid

class PlotGrid : public QwtPlotGrid

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and

class PlotBackground : public QwtPlotShapeItem

class PlotBackground : public QwtPlotShapeItem

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.

The implementation is working with Qwt 5.2.3 and Qt 4.8.2 and updated the Qwt to 6.1.6 and Qt 5.15.2 and the plot grid and plot background are not shown anymore in the plot panel.

I already added the libraries needed qwtd.dll, qwt.dll, Qt5Core.dll, Qt5Cored.dll, Qt5Gui.dll, Qt5Guid.dll, Qt5Widgets.dll and Qt5Widgetsd.dll.

I added a break point in the draw method and it does not trigger the break points in VS2019. Testing my old Qt and Qwt version in VS2008 will trigger the break point in the draw method.

The only difference in the code is that I inherit the PlotGrid class to QwtPlotGrid instead of QwtPlotItem


Regards,
olredi