main.cpp
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#include <qapplication.h>
#include "plot.h"
#ifndef QWT_NO_OPENGL
#define USE_OPENGL 1
#endif
#if USE_OPENGL
#include <qgl.h>
#include <qwt_plot_glcanvas.h>
#else
#include <qwt_plot_canvas.h>
#endif
int main ( int argc, char **argv )
{
#if USE_OPENGL
#if QT_VERSION >= 0x040600 && QT_VERSION < 0x050000
// on my box QPaintEngine::OpenGL2 has serious problems, f.e:
// the lines of a simple drawRect are wrong.
QGL::setPreferredPaintEngine( QPaintEngine::OpenGL );
#endif
#endif
QApplication a( argc, argv );
Plot plot;
#if USE_OPENGL
QwtPlotGLCanvas *canvas = new QwtPlotGLCanvas();
canvas->setFrameStyle( QwtPlotGLCanvas::NoFrame );
#else
QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setFrameStyle( QFrame::NoFrame );
canvas->setPaintAttribute( QwtPlotCanvas::BackingStore, false );
#endif
plot.setCanvas( canvas );
plot.setCanvasBackground( QColor( 30, 30, 50 ) );
plot.resize( 400, 400 );
plot.show();
return a.exec();
}