QwtScaleDraw for yaxis

Hi,

In my app I have a Plot which shows for example a Temperature curve. Additionally to this Plot I have small plots below showing Binary Information of alarm, Input or Relais states.

e.g. I have 5 different Inputs. I have one plot with a yaxis from 0 to 9:
0 & 1: First Input (0 = 0, 1 = 1)
2 & 3: Second Input (2 = 0, 3 = 1)
4 & 5: Third Input (4 = 0, 5 = 1)
6 & 7: Fourth Input (6 = 0, 7 = 1)
8 & 9: Fifth Input (8 = 0, 9 = 1)

I want to display instead of 0 to 9, 0-1-0-1-0-1... on my left yaxis.

Code:

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class BinaryScaleDraw: public QwtScaleDraw
{
public:
    BinaryScaleDraw(){
    }
    virtual QwtText label(int v) const{
        QString LabelText;
        int i;
        i = v % 2;
        LabelText = QString::number(i,2);
        return LabelText;
    }
};

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Code:

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QwtPlot *BinaryPlot;
BinaryPlot = new QwtPlot(DataList.at(i)->NameWithoutNumber(),this);
ui->verticalLayout->addWidget(BinaryPlot);
BinaryPlot->setCanvasBackground(Qt::white);
BinaryPlot->setAxisScale(QwtPlot::yLeft, 0, 2*DataList.at(i)->quantity()-1, 1);
BinaryPlot->setAxisScaleDraw(QwtPlot::yLeft, new BinaryScaleDraw());

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I tried it like this, but this does not work. :(

"virtual QwtText label(int v) const" is not overloading virtual "QwtText label(double v) const" !

Uwe

Thank You. :) This was very helpful.

The idea is to have two or more Plots, which share the same x-Axis or else one plot with two or more yAxis one below the other. I found some help to this theme but couldnt find an example. :(

If I use different plots i need to connect the axis (when i zoom in one plot i need to zoom in the others too) and the canvas need to be in a vertical layout with the other canvas. If i try this I get errors. Is there any way to do this?

Quote:

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The idea is to have two or more Plots, which share the same x-Axis ...

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Check the plotmatrix example.

Quote:

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...or else one plot with two or more yAxis one below the other.

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svn export https://svn.code.sf.net/p/qwt/code/b...-6.1-multiaxes

Uwe

Quote:

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Originally Posted by Uwe

Check the plotmatrix example.

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Okay I checked the example but there is still the problem. If I have for example on my first plot a y-axis with a scale from 100-600 and on the other plots just 0 and 1 the plots aren't exactley below each other. :(

Quote:

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Originally Posted by mikrocat

Okay I checked the example but there is still the problem. If I have for example on my first plot a y-axis with a scale from 100-600 and on the other plots just 0 and 1 the plots aren't exactley below each other. :(

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Then you need to have a second look at the plotmatrix example.

Uwe

Sorry, it was friday. I changed the scaledraw of my yAxis after the alignVaxis was called. So the alignment was ruined.

Thank You!