Labels on axis.

Hello. How I can change frequency of labels drawning on axis? (Example in attachment)

I think that you should set your own scalediv with your own ticks. As far as I know visble values of scale are - majorTicks. So majorTick values should be [1,2,3,4...] and minorTicks - [0.5,1.5,...]

I tried this code, but has no effect. What do I wrong?

Code:

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QwtScaleDiv scaleDiv;
    QwtValueList vList;
    vList<<1<<2<<3<<4<<5;
    scaleDiv.setTicks(QwtScaleDiv::MajorTick,vList);
    setAxisScaleDiv(xBottom,scaleDiv);

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Quote:

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Originally Posted by eugene

I tried this code, but has no effect. What do I wrong?

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A QwtScaleDiv is more than its ticks - at least you have to set a valid interval.
The rest of this code snippet looks o.k. for me.

Uwe

How I can get this intervals and set they? I cant understand this, because documentation of Qwt very poor, and I don't have any examples about this. I tried code from this topic http://www.qtcentre.org/threads/3254...-in-the-middle but also has no effect.

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How I can get this intervals ...

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Maybe [1-5], but what do I ( or anybody else beside you ) know about the interval you want to have displayed on your axis ?

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... and set they?

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QwtScaleDiv::setInterval(). The docs might be weak, but ...

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I cant understand this, because documentation of Qwt very poor, ...

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QwtScaleDiv stores the min/max values of a scale and the positions of its ticks. What else needs to be understood ?

But is setting the ticks manually really what you want you to do - I guess instead you want to use the scale engine that is responsible for calculating the ticks configured, so that you get major ticks at each integer number: for this you have to play with the step parameter in QwtPlot::setAxisScale or with QwtPlot::setAxisMaxMajor().

Uwe