How do I get a plot working using Qt Creator and the Design Tab?

[CodingGnome]

I've spent a few hours looking, but I've found nothing.

I already know how to do all the basic stuff via coding in c++, but I'm trying to figure out how to do this using the Qt Creator Design tab.

Steps I do so far:
1) Open my project from Qt Creator
2) Open my mainwindow.ui file which takes me to the design tab
3) drag and drop a Qwt Plot widget onto my form
4) ?


As I said, I've already got my program working by using the following mainwindow code (that does not use a ui file), but I want to figure out how to do this from the Qt Creator Designer tab.

Current working non-ui mainwindow.cpp code:

#include "mainwindow.h"
#include "plot.h"
#include <qwt_scale_engine.h>
#include <qlabel.h>
#include <qlayout.h>
 
MainWindow::MainWindow( QWidget *parent ):
    QWidget( parent )
{
    const double intervalLength = 10.0; // seconds
 
    d_plot = new Plot( this );
    d_plot->setIntervalLength( intervalLength );
 
 
    QHBoxLayout *layout = new QHBoxLayout( this );
    layout->addWidget( d_plot, 10 );
}
 
void MainWindow::start()
{
    d_plot->start();
}

#include "mainwindow.h"
#include "plot.h"
#include <qwt_scale_engine.h>
#include <qlabel.h>
#include <qlayout.h>

MainWindow::MainWindow( QWidget *parent ):
    QWidget( parent )
{
    const double intervalLength = 10.0; // seconds

    d_plot = new Plot( this );
    d_plot->setIntervalLength( intervalLength );


    QHBoxLayout *layout = new QHBoxLayout( this );
    layout->addWidget( d_plot, 10 );
}

void MainWindow::start()
{
    d_plot->start();
}

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[Santosh Reddy]

In the designer add a plain widget and promote it to Plot, Right click on widget and then prommote, here give the Plot class details.

Then your code should look like this

#include "mainwindow.h"
#include "plot.h"
#include <qwt_scale_engine.h>
#include <qlabel.h>
#include <qlayout.h>
 
#include "ui_plot.h"
 
MainWindow::MainWindow( QWidget *parent ):
    QWidget( parent ),
    ui(new Ui::Plot())
{
    const double intervalLength = 10.0; // seconds
 
    setupUi(this);
    ui->plot->setIntervalLength( intervalLength );
}
 
void MainWindow::start()
{
    ui->plot->start();
}

#include "mainwindow.h"
#include "plot.h"
#include <qwt_scale_engine.h>
#include <qlabel.h>
#include <qlayout.h>

#include "ui_plot.h"

MainWindow::MainWindow( QWidget *parent ):
    QWidget( parent ),
    ui(new Ui::Plot())
{
    const double intervalLength = 10.0; // seconds

    setupUi(this);
    ui->plot->setIntervalLength( intervalLength );
}

void MainWindow::start()
{
    ui->plot->start();
}

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