QwtPlot, how to remove gap between xBottom axis and yLeft?

[Renat]

Hello!
I have some code:

...
QwtPlot *MyPlot = new QwtPlot;
...

By default, Qwt plot inserts gap between 0 at Ox axis and 0 at Oy axis.
how to remove gap between xBottom axis and yLeft (in the left bottom corner)?


when I do:
...
MyPlot->axisWidget(QwtPlot::xBottom)->setMargin(0);
MyPlot->axisWidget(QwtPlot::yLeft)->setMargin(0);
...
gap is decrease by factor two.

I need to remove gap at all.


Here you can see it (with gap).

[QtDeveloper]

I am facing the same problem. Can somebody provide a solution?
Thanks in advance.

[Uwe]

Check the examples - at least one of them should demonstrate the combination you are looking for.

Uwe

[QtDeveloper]

Hello Uwe,

Thanks a lot. I found the refreshtest example, which does something very similar that I can definitely use.

I have another question. When I am creating a QwtPlot with a frame as the parent, it seems there is a margin of 4 pixels between the ticks and the frame border. How can I remove this spacing too, so that ticks start from the frame boundary? The frame applies QHBoxLayout with no margin/spacing and at present the QwtPlot is the only control there.

Thanks in advance,

[Uwe]

plot->plotLayout()->setAlignCanvasToScales( true );
plot->canvas()->setLineWidth( 0 );
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
{
    plot->axisWidget( axis )->setMargin( 0 );
    plot->axisScaleDraw( axis )->enableComponent(
        QwtAbstractScaleDraw::Backbone, false );
}

plot->plotLayout()->setAlignCanvasToScales( true );
plot->canvas()->setLineWidth( 0 );
for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
{
    plot->axisWidget( axis )->setMargin( 0 );
    plot->axisScaleDraw( axis )->enableComponent(
        QwtAbstractScaleDraw::Backbone, false );
}

To copy to clipboard, switch view to plain text mode 

Decide yourself which of these settings you want to have on your plot,

Uwe