Crosshair on Canvas

[JSchn88]

Hello community,

the simple things i need are a vertical- and horizontal line which cross on mouse position. While using QwtPlotPicker i saw that this class has the functionality to do that by using the rubberband. But it´s just visible while the left mousebutton is clicked and not the whole time my mouse is over the canvas.

hope you can give me a hint if there is a qwt class that provides this functionality

After searching some hours by google i found a good solution for it ! It works fine!

thx a lot
Jens

[Uwe]

Use Qwt 6:

picker = new QwtPlotPicker( QwtPlot::xBottom,  QwtPlot::yLeft,
    QwtPlotPicker::CrossRubberBand,  QwtPicker::AlwaysOn,
    plot->canvas() );
picker->setStateMachine(new QwtPickerTrackerMachine());
picker->setRubberBandPen(...);
picker->setRubberBand(QwtPicker::CrossRubberBand);

picker = new QwtPlotPicker( QwtPlot::xBottom,  QwtPlot::yLeft,
    QwtPlotPicker::CrossRubberBand,  QwtPicker::AlwaysOn,
    plot->canvas() );
picker->setStateMachine(new QwtPickerTrackerMachine());
picker->setRubberBandPen(...);
picker->setRubberBand(QwtPicker::CrossRubberBand);

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Uwe