Re: no curve visible

[David S. <David_Stranz@MassSpec.com>]

Harold,

It looks OK.  Try adding curve1->setStyle( QwtPlotCurve::Lines );
Could be the default is QwtPlotCurve::NoCurve.

David
_______________________________________________________________
David Stranz, Ph.D.	david_stranz@MassSpec.com

Sierra Analytics, Inc.
5815 Stoddard Road, Suite 601
Modesto, CA  95356

Tel: (209) 545-8508
http://www.massspec.com
_______________________________________________________________



harold garbeil wrote:
> Greetings
> I have been trying out qwt with a very simple application. I have not 
> been able to get the plot to appear in the MainWindow but the curve is 
> not visible. I am running qwt-5.2.0 with qt 4.6.2. Everything compiles 
> fine, with the plot showing with proper axis scaling. Only thing missing 
> is the curve. The code is fairly simple, with my "myPlot" (derived from 
> QwtPlot) class looking like the following ...
> 
> #include "myplot.h"
> 
> MyPlot::MyPlot(QWidget *gv) : QwtPlot ( gv)
> {
>     int i ;
> 
>     setTitle ("junk") ;
>     QwtPlotCurve *curve1 = new QwtPlotCurve("Curve 1");
>     curve1->attach(this);
>   
>     // alloc memory for data arrays
>     xdata = new double [100] ;
>     ydata = new double [100] ;
>  
>     //load up test data
>     for (i = 0; i < 100; i++)
>     {
>                     xdata[i] = i ;
>                     ydata[i] = i ;
>     }
> 
>     curve1->setRawData(xdata, ydata, 100);
>     curve1->setPen(QPen(Qt::red, 3));
> 
>     this->replot() ;
> 
> }
> ~                                                                               
> 
> ~                                                                               
> 
> 
> This is placed in a MainWindow with the following constructor for the 
> MainWindow via
> 
> #include "mainwindow.h"
> #include "ui_mainwindow.h"
> 
> 
> MainWindow::MainWindow(QWidget *parent) :
>     QMainWindow(parent),
>     ui(new Ui::MainWindow)
> {
>     ui->setupUi(this);
> 
>     myPlot = new MyPlot (this) ;
>     this->setCentralWidget (myPlot) ;
> 
>     // do the replot in constructor for myPlot....
>     //myPlot->replot() ;
> }
> 
> Thanks for any help you can provide
> 
> 
> 
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