qtforum.de

Code: Alles auswählen

#include <QtCore>
#include <QCoreApplication>
#include <QApplication>
#include <qapplication.h>
#include <qwt_plot.h>
#include <qwt_data.h>
#include <qwt_plot_marker.h>
#include <qwt_plot_curve.h>
#include <qwt_legend.h>
#include <qwt_text.h>
#include <qwt_math.h>
#include <iostream>

using namespace std;

class MyPlot : public QwtPlot
{
public:
  MyPlot( QWidget *parent=0, char *name=0 ) : QwtPlot( parent, name )
  {
    // Show a title
    setTitle( "This is an Example" );

    // Show a legend at the bottom
    setAutoLegend( true );
    setLegendPos( Qwt::Bottom );

    // Show the axes
    setAxisTitle( xBottom, "x" );
    setAxisTitle( yLeft, "y" );

    // Insert two curves and get IDs for them
    long cSin = insertCurve( "y = sin(x)" );
    long cSign = insertCurve( "y = sign(sin(x))" );

    // Calculate the data, 500 points each
    const int points = 500;
    double x[ points ];
    double sn[ points ];
    double sg[ points ];

    for( int i=0; i<points; i++ )
    {
      x[i] = (3.0*3.14/double(points))*double(i);

      sn[i] = 2.0*sin( x[i] );
      sg[i] = (sn[i]>0)?1:((sn[i]<0)?-1:0);
    }

    // Copy the data to the plot
    setCurveData( cSin, x, sn, points );
    setCurveData( cSign, x, sg, points );

    // Set the style of the curves
    setCurvePen( cSin, QPen( blue ) );
    setCurvePen( cSign, QPen( green, 3 ) );

    // Show the plots
    replot();
  }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    MyPlot p;
     a.setMainWidget( &p );
     p.show();

    return a.exec();
}

Code: Alles auswählen

TEMPLATE = app
TARGET = z1 

QT        += core 

HEADERS   +=
SOURCES   += main.cpp
FORMS	  +=
RESOURCES +=
CONFIG    +=  console 
LIBS += -L"C:/qwt/lib" -lqwt5 -lqwtd5
INCLUDEPATH += "C:/qwt/src"
DEFINES +=  QT_DLL / QWT_DLL 
QWT_ROOT = C:/qwt
export LD_LIBRARY_PATH=C:/qwt/lib