QT : QwtExample1

https://github.com/richelbilderbeek/QwtExample1

#include <cmath>
	#include <QApplication>
	#include <QTimer>
	#include <qwt_plot.h>
	#include <qwt_plot_curve.h>
	#include <qwt_point_data.h>
	int main(int argc, char **argv)
	{
	QApplication a(argc, argv);
	QwtPlot plot(QwtText("QwtExample1"));
	plot.setGeometry(0,0,640,400);
	plot.setAxisScale(QwtPlot::xBottom, 0.0,2.0 * M_PI);
	plot.setAxisScale(QwtPlot::yLeft,-1.0,1.0);
	QwtPlotCurve curve("Sine");
	std::vector<double> xs;
	std::vector<double> ys;
	for (double x = 0; x < 2.0 * M_PI; x+=(M_PI / 100.0))
	{
	xs.push_back(x);
	ys.push_back(std::sin(x) * std::cos(x));
	}
	QwtPointArrayData * const data = new QwtPointArrayData(&xs[0],&ys[0],xs.size());
	curve.setData(data);
	curve.attach(&plot);
	plot.show();
	//In demo mode, close after 1 second
	if (argc == 2 && argv[1] == std::string("--demo"))
	{
	QTimer * const timer = new QTimer;
	QObject::connect(timer, SIGNAL(timeout()), &plot, SLOT(close()));
	timer->start(1000);
	}
	return a.exec();
	}