Qwt : align center the date/time label text on an bottom axis

[vcloarec]

With Qwt, I want that the time and the date are both center under the stick under a bottom axis, but the time is still on the left side like in this picture :

Capture.jpg

I have tried to use

QwtDateScaleDraw::setLabelAlignment(Qt::AlignHCenter|Qt::AlignBottom);

QwtDateScaleDraw::setLabelAlignment(Qt::AlignHCenter|Qt::AlignBottom);

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But the time is still on the left.

I have tried to subclass the QwtScaleDraw like this:

class MyDateScaleDraw:public QwtDateScaleDraw
{
public:
    QwtText label(double value) const override
    {
        QwtText txt=QwtDateScaleDraw::label(value);
        txt.setRenderFlags(Qt::AlignHCenter);
        return txt;
    }
};

class MyDateScaleDraw:public QwtDateScaleDraw
{
public:
    QwtText label(double value) const override
    {
        QwtText txt=QwtDateScaleDraw::label(value);
        txt.setRenderFlags(Qt::AlignHCenter);
        return txt;
    }
};

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But the time is still on the left side.

Somebody know how to center the time ?

[Narasimha Reddy]

Actually I didn't get which way you are following:
If it is Layout design
http://doc.qt.io/qt-5/qtwidgets-layo...s-example.html

take QGridlayout and add your label at pirtuculer position
or
my_label ->setGeometry(x,y,width,hight);

[Uwe]

class YourScaleDraw: public QwtScaleDraw
{
    virtual QwtText label( double value ) const override
    {
          auto text = QwtScaleDraw::label( value );
          text.setRenderFlags( ... );
          return text;
    }
};
 
plot->setAxisScaleDraw( ..., new YourScaleDraw() );

class YourScaleDraw: public QwtScaleDraw
{
    virtual QwtText label( double value ) const override
    {
          auto text = QwtScaleDraw::label( value );
          text.setRenderFlags( ... );
          return text;
    }
};

plot->setAxisScaleDraw( ..., new YourScaleDraw() );

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The render flags go as flags into https://doc.qt.io/qt-5/qpainter.html#drawText-4.
If you like to do more fancy texts you can consider using rich text labels.

In your case you have to derive from QwtDateScaleDraw - the idea is the same.

Uwe

[vcloarec]

Thanks Uwe for your answer,

Your suggestion is what I have tried (see the code in my post), but the

setRenderFlags

setRenderFlags

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in MyDateScaleDraw class doesn't change the alignment of the axis label...