zooming with ctrl + mouse wheel

[alperyazir66]

My problem is very interesting to me. I am working on Qwt and I would like to enable zoom respect X and Y axis separately. I achived zoom only X axis but Y axis didn't work. I couldn't get it. I will be glad if you give an advise.

Here is my code:

void Kmh::keyPressEvent(QKeyEvent *event)
{
    zoom_in_out = new QwtPlotMagnifier( canvas() );
 
    if(event->key() == Qt::Key_Shift)
    {
        zoom_in_out->setWheelModifiers(Qt::ShiftModifier);
        zoom_in_out->setAxisEnabled(Qt::XAxis,false);
    }
    else if(event->key() == Qt::Key_Control)
    {
        zoom_in_out->setWheelModifiers(Qt::ControlModifier);
        zoom_in_out->setAxisEnabled(Qt::YAxis,false);
    }
}

void Kmh::keyPressEvent(QKeyEvent *event)
{
    zoom_in_out = new QwtPlotMagnifier( canvas() );

    if(event->key() == Qt::Key_Shift)
    {
        zoom_in_out->setWheelModifiers(Qt::ShiftModifier);
        zoom_in_out->setAxisEnabled(Qt::XAxis,false);
    }
    else if(event->key() == Qt::Key_Control)
    {
        zoom_in_out->setWheelModifiers(Qt::ControlModifier);
        zoom_in_out->setAxisEnabled(Qt::YAxis,false);
    }
}

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shift + mousewheel is working for zoom respect X axis. But ctrl + mousewheel is zooming both X and Y axis. What am I doing wrong?

Regards

[Uwe]

Do something like this:

class YourPlot: public QwtPlot
{
public:
    YourPlot( QWidget *parent ):
        QwtPlot( parent )
    {
        QwtPlotMagnifier *magnifier1 = new QwtPlotMagnifier( canvas() );
        magnifier1->setMouseButton(... );
        magnifier1->setAxisEnabled( QwtPlot::yLeft, false );
 
        QwtPlotMagnifier *magnifier2 = new QwtPlotMagnifier( canvas() );
        magnifier2->setMouseButton(... );
        magnifier2->setAxisEnabled( QwtPlot::xBottom, false );
 
         ...
    }
};

class YourPlot: public QwtPlot
{
public:
    YourPlot( QWidget *parent ):
        QwtPlot( parent )
    {
        QwtPlotMagnifier *magnifier1 = new QwtPlotMagnifier( canvas() );
        magnifier1->setMouseButton(... );
        magnifier1->setAxisEnabled( QwtPlot::yLeft, false );

        QwtPlotMagnifier *magnifier2 = new QwtPlotMagnifier( canvas() );
        magnifier2->setMouseButton(... );
        magnifier2->setAxisEnabled( QwtPlot::xBottom, false );

         ...
    }
};

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HTH,
Uwe

[bradbill]

all this time had problems till i found this. thanks