[Qt-interest] QWt Errors

[Sujan Dasmahapatra]

Plss see the errors below while I tried to compile chap 11's 1st code
simply plotting a curve.....

See also the code below

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main.cpp: In constructor `MyPlot::MyPlot(QWidget*, char*)':

main.cpp:7: error: no matching function for call to
`QwtPlot::QwtPlot(QWidget*&, char*&)'

/usr/local/include/qwt_plot.h:73: note: candidates are:
QwtPlot::QwtPlot(const QwtPlot&)

/usr/local/include/qwt_plot.h:130: note:
QwtPlot::QwtPlot(const QwtText&, QWidget*)

/usr/local/include/qwt_plot.h:129: note:
QwtPlot::QwtPlot(QWidget*)

main.cpp:12: error: `setAutoLegend' was not declared in this scope

main.cpp:13: error: `Qwt' has not been declared

main.cpp:13: error: `Bottom' was not declared in this scope

main.cpp:13: error: `setLegendPos' was not declared in this scope

main.cpp:20: error: `insertCurve' was not declared in this scope

main.cpp:38: error: `setCurveData' was not declared in this scope

main.cpp:42: error: `blue' was not declared in this scope

main.cpp:42: error: invalid use of undefined type `struct QPen'

/usr/local/pack/Qt-4.4.3/include/QtGui/qwindowdefs.h:69: error: forward
declaration of `struct QPen'

main.cpp:42: error: `setCurvePen' was not declared in this scope

main.cpp:43: error: `green' was not declared in this scope

main.cpp:43: error: invalid use of undefined type `struct QPen'

/usr/local/pack/Qt-4.4.3/include/QtGui/qwindowdefs.h:69: error: forward
declaration of `struct QPen'

main.cpp:12: warning: unused variable 'setAutoLegend'

main.cpp:13: warning: unused variable 'Bottom'

main.cpp:13: warning: unused variable 'setLegendPos'

main.cpp:42: warning: unused variable 'blue'

main.cpp:43: warning: unused variable 'green'

main.cpp: In function `int main(int, char**)':

main.cpp:56: error: 'class QApplication' has no member named
'setMainWidget'

make: *** [main.o] Error 1

 

////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////

///see the code below

////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////

#include <QApplication>

#include <qwt_plot.h>

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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