[Qt-interest] Qwt Error

[Sujan Dasmahapatra]

Dear Friends 

I have installed Qwt for plotting when I am trying to compile the give
tutorial code I ma getting a lot of errors..Mostly I think because of
header file inclusion or .pro file add  ons......Can u say anyone how
could I compile this piece of code for Qwt.

What header files if at all I need to include and what I have to specify
in the .pro file plss help me...

////////////////////////////////////////////////////////////////////////
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/////////////////main.cpp

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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();
}

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Kind regards, 
LM Glasfiber R&D (India) Pvt. Ltd.
 
Sujan Dasmahapatra
Project Engineer - CFD
  
Telephone: +91 80 66470248 
Mobile: 
E-mail: sdh at lmglasfiber.com <mailto:sdh at lmglasfiber.com>  

 

 

 

 

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