#ifndef HELLOWORLD_H
#define HELLOWORLD_H
#include <QWidget>
#include "vtkGraphLayoutView.h"
#include "vtkRandomGraphSource.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
namespace Ui {
class HelloWorld;
}
class HelloWorld : public QWidget
{
    Q_OBJECT
public:
    explicit HelloWorld(QWidget *parent = 0);
    ~HelloWorld();
private:
    Ui::HelloWorld *ui;
};
#endif // HELLOWORLD_H

#include "helloworld.h"
#include "ui_helloworld.h"
HelloWorld::HelloWorld(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::HelloWorld)
{
    ui->setupUi(this);
    vtkRandomGraphSource *source = vtkRandomGraphSource::New();
    vtkGraphLayoutView *view = vtkGraphLayoutView::New();
    view->SetRepresentationFromInputConnection(source->GetOutputPort());
    view->SetRenderWindow(ui->widget->GetRenderWindow());
    view->ResetCamera();
    view->Render();
}
HelloWorld::~HelloWorld()
{
    delete ui;
}