I'm attempting to plot a graph based on data that I have obtained and stored inside a vector, but, I cannot seem to find any tutorials or references out there and give me any indication to what I need to do. So here is my code:
class Plotter : public QwtPlot
{
public:
Plotter() {
}
};
int main( int argc, char **argv )
{
QApplication app(argc, argv);
//Plotter *d_plot = new Plotter();
Plotter* d_plot = new Plotter();
d_plot->setTitle("DEMO");
d_plot->setCanvasBackground(Qt::white);
d_plot->setAxisScale( QwtPlot::yLeft, 0.1, 50.0 );
d_plot->setAxisScale(QwtPlot::yRight, 0.1, 50.00);
// PLOT THE DATA
std::vector<double> data;
data.push_back(1.03);
data.push_back(13.12);
//....
d_plot->resize( 600, 400 );
d_plot->show();
return app.exec();
}
Could anyone give me any ideas to what function I could use to allow me to plot the data?
Thanks
Answer
Check the QwtPlot docs: normally you create a QwtPlotCurve, use QwtPlotCurve::setSamples to get the data in it then QwtPlotCurve::attach to get the data drawn.
Should be something like this:
std::vector<double> x;
std::vector<double> y;
//fill x and y vectors
//make sure they're the same size etc
QwtPlotCurve curve( "Foo" );
//or use &x[ 0 ] or &(*x.first()) pre-C++11
cure.setSamples( x.data(), y.data(), (int) x.size() );
curve.attach( &plot );