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Thread: making a RubberBand for selecting an area

  1. #1
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    Default making a RubberBand for selecting an area

    Hi,

    I need to select an area with a RubberBand that returns QRectF::top, QRectF::bottom, QRectF::left, QRectF::right. For this I do this:

    Qt Code:
    1. QwtPlotZoomer* zoomer = new QwtPlotZoomer( canvas );
    2. zoomer->setRubberBandPen( QColor( Qt::red ) );
    3. zoomer->setTrackerPen( QColor( Qt::green ) );
    4. zoomer->setMousePattern( QwtEventPattern::MouseSelect2,
    5. Qt::RightButton, Qt::ControlModifier );
    6. zoomer->setMousePattern( QwtEventPattern::MouseSelect3,
    7. Qt::RightButton );
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    and by using zoomed (const QRectF &rect) signal, rect can be obtain.

    Qt Code:
    1. connect(zoomer, zoomed (QRectF), this, slot_pos(QRectF));
    2.  
    3. void MyClass::slot_pos(QRectF pos)
    4. {
    5. qDebug() << pos.top << pos.bottom << pos.left << pos.right;
    6. }
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    now I have this problem:
    Mouse LeftButton causes zooming. I want to to select an area with a RubberBand without zooming by for example LeftButton +ctrl.

  2. #2
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    Default Re: making a RubberBand for selecting an area

    QwtPlotZoomer - zooming = QwtPlotPicker;

    The keys or mouse actions being used for starting,moving and terminating the selection is customizable.

    Uwe

  3. #3
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    Default Re: making a RubberBand for selecting an area

    Thanks Uwe, I used this and nothing happens and no RubberBand has been appeared:
    Qt Code:
    1. QwtPlotPicker* picker= new QwtPlotPicker( canvas );
    2.  
    3. picker->setRubberBandPen( QColor( Qt::red ) );
    4. picker->setTrackerPen( QColor( Qt::green ) );
    5. picker->setMousePattern( QwtEventPattern::MouseSelect2,
    6. Qt::RightButton, Qt::ControlModifier );
    To copy to clipboard, switch view to plain text mode 

  4. #4
    Join Date
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    Default Re: making a RubberBand for selecting an area

    This is your initial sequence to get something started:
    Qt Code:
    1. QwtPlotPicker* picker= new QwtPlotPicker( plot->canvas() );
    2. picker->setStateMachine( new QwtPickerDragRectMachine() );
    3. picker->setRubberBand( QwtPlotPicker::RectRubberBand );
    4. picker->setRubberBandPen( QColor( Qt::red ) );
    5. picker->setTrackerPen( QColor( Qt::green ) );
    6. picker->setTrackerMode( QwtPlotPicker::ActiveOnly );
    7.  
    8. connect( picker, SIGNAL( selected( const QRectF &rect ) ), ... );
    To copy to clipboard, switch view to plain text mode 
    Choose the type of state machine you like and check its docs, what type of event patterns are used by it. In case of the rectangle machines it is using QwtEventPattern::MouseSelect1 and QwtEventPattern::KeySelect1 - what means changing QwtEventPattern::MouseSelect2 ( like in your code snippet ) will have no effect.

    Uwe

  5. The following user says thank you to Uwe for this useful post:

    Alex22 (13th July 2016)

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