Qwt: Axis Border Dist?

[alperyazir66]

I have two plots which has created by using qwt. But I couldn't sync their axis(xBottom) with each other.

Ekran Alıntısı.jpg


They both have (30,30) BorderDist

plot1->axisWidget(QwtPlot::xBottom)->setMinBorderDist(30,30) //distance between axis and border
plot2->axisWidget(QwtPlot::xBottom)->setMinBorderDist(30,30) //distance between axis and border

plot1->axisWidget(QwtPlot::xBottom)->setMinBorderDist(30,30) //distance between axis and border
plot2->axisWidget(QwtPlot::xBottom)->setMinBorderDist(30,30) //distance between axis and border

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but only upper plot apply this function and there is a difference between axises.

How can I solve this?

Regards.

[Uwe]

What about this:

const int margin = 30;
plot1->plotLayout()->setCanvasMargin( margin, QwtPlot::yLeft );
plot1->plotLayout()->setCanvasMargin( margin, QwtPlot::yRight );
plot2->plotLayout()->setCanvasMargin( margin, QwtPlot::yLeft );
plot2->plotLayout()->setCanvasMargin( margin, QwtPlot::yRight );

const int margin = 30;
plot1->plotLayout()->setCanvasMargin( margin, QwtPlot::yLeft );
plot1->plotLayout()->setCanvasMargin( margin, QwtPlot::yRight );
plot2->plotLayout()->setCanvasMargin( margin, QwtPlot::yLeft );
plot2->plotLayout()->setCanvasMargin( margin, QwtPlot::yRight );

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You probably need Qwt 6.1.1 - AFAIR 6.1.0 had a bug when setting canvas margins in combination with hidden axes.

Uwe

[alperyazir66]

Hey Uwe,

I tried you advise but when i does:

enableAxis(QwtPlot::xBottom,false)

enableAxis(QwtPlot::xBottom,false)

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for plot2, it doesn't care margin value. By the way I tried also in version6.1.1 it has same result.

[Uwe]

Adding the following lines to the simpleplot example in the 6.1 branch shows the expected result:

plot.enableAxis( QwtPlot::xBottom, false );
plot.plotLayout()->setCanvasMargin( 30, QwtPlot::yLeft );
plot.plotLayout()->setCanvasMargin( 30, QwtPlot::yRight );

plot.enableAxis( QwtPlot::xBottom, false );
plot.plotLayout()->setCanvasMargin( 30, QwtPlot::yLeft );
plot.plotLayout()->setCanvasMargin( 30, QwtPlot::yRight );

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Guess something went wrong on your side with installing/using Qwt 6.1.1 ?

Uwe

[alperyazir66]

I think "axis numbers" cause this problem. if I give border width enough, two plots axises are great.

Thanks again Uwe.

[Uwe]

I think "axis numbers" cause this problem.

Yes of course - there needs to be space for the outer halfs of the outmost tick labels.

Both - the border distances of the scale widgets and the canvas margins - have the effect to create extra spaces, but the canvas margin works regardless if a scale is hidden or not.

Uwe