CODEWITHSUNDEEP
c++qtqwt
Aashu
Aashu

Reputation: 51

qwt plot curve axis not visible

I am using qwt plot curve to draw curve. the x axis and the y axis are not visible, only the curve is visible. How to show the axis with showing some first, last and middle values in the scale interval of the axis

Upvotes: 0

Views: 3606

Answers (2)

Sergey P. aka azure
Sergey P. aka azure

Reputation: 4742

1) You should have some QwtPlot object. I assume you want to draw xBottom and yLeft axes.

QwtPlot *plot=new QwtPlot(this);
//following 4 lines may not be required because
//QwtPlot defaults are to show xBottom and yLeft axes
//and you use autoscaling for these axes
plot->enableAxis(QwtPlot::xBottom);
plot->enableAxis(QwtPlot::yLeft);
plot->setAxisAutoScale(QwtPlot::xBottom,true);
plot->setAxisAutoScale(QwtPlot::yLeft,true);

You already have it if you were using QtDesigner and QwtPlot widget with it. You can access it with ui->plot

2) You should have 

QwtPlotCurve * curve = new QwtPlotCurve();
//.... attach some data to curve
curve->attach(plot);

3) Probably you want to call replot

plot->replot();

Upvotes: 1

v0latile
v0latile

Reputation: 56

I give you a small example: 

   // xBottom - x-axis yBottom - y-axis

    plot->setAxisMaxMinor(QwtPlot::xBottom, 2);
    plot->setAxisScale(QwtPlot::xBottom, 0, MAX_X_VALUE, 2);
    plot->setAxisMaxMinor(QwtPlot::yLeft, 2);
    plot->setAxisScale(QwtPlot::yLeft, 0, 1, 1);
    plot->setAxisMaxMinor(QwtPlot::yLeft, 1);
    plot->setAxisScale(QwtPlot::yLeft, -1, 1, 1);

Upvotes: 2

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