qwtplot and mouse tracking

[FelixB]

got it I had to write my own subclass of QwtPlotPicker and overriding the "trackerText" method:

class MyPicker : public QwtPlotPicker
    {
        Q_OBJECT
 
    public:
        MyPicker(int xAxis, int yAxis, int selectionFlags, RubberBand rubberBand, DisplayMode trackerMode, QwtPlotCanvas* canvas);
 
    signals:
        void mouseMoved(const QPoint& pos) const;    
 
    protected:
            virtual QwtText trackerText (const QwtDoublePoint & pos) const;
 
    };

class MyPicker : public QwtPlotPicker
    {
        Q_OBJECT

    public:
        MyPicker(int xAxis, int yAxis, int selectionFlags, RubberBand rubberBand, DisplayMode trackerMode, QwtPlotCanvas* canvas);

    signals:
        void mouseMoved(const QPoint& pos) const;    

    protected:
            virtual QwtText trackerText (const QwtDoublePoint & pos) const;
                
    };

To copy to clipboard, switch view to plain text mode 

MyPicker::MyPicker(int xAxis, int yAxis, int selectionFlags, RubberBand rubberBand, DisplayMode trackerMode, QwtPlotCanvas* canvas)
            : QwtPlotPicker(xAxis, yAxis, selectionFlags, rubberBand, trackerMode, canvas)
        {}
 
QwtText MyPicker::trackerText (const QwtDoublePoint & pos) const
    {
        const QPoint point = pos.toPoint();
        emit mouseMoved(point);
        return QwtText(QString::number(point.x()) + ", " + QString::number(point.y()));
    }

MyPicker::MyPicker(int xAxis, int yAxis, int selectionFlags, RubberBand rubberBand, DisplayMode trackerMode, QwtPlotCanvas* canvas)
            : QwtPlotPicker(xAxis, yAxis, selectionFlags, rubberBand, trackerMode, canvas)
        {}

QwtText MyPicker::trackerText (const QwtDoublePoint & pos) const
    {
        const QPoint point = pos.toPoint();
        emit mouseMoved(point);
        return QwtText(QString::number(point.x()) + ", " + QString::number(point.y()));
    }

To copy to clipboard, switch view to plain text mode 

now I can react to the "mouseMoved"-signal

[FelixB]

I'm not sure if this is related to QwtPlotPicker or general to Qt...

as written above, I want to react to the mouseMoved-signal. Currently, I write text into the statusBar. But I want to do this only as long as the mouse is on my plot. When the user moves the mouse outside the canvas, I don't want to do anything. Is there a possibility to check if the cursor is on the canvas? Or the get a signal when the cursor has left the canvas?