[vtkusers] How to read and display a JPEG image

[Elvis Dowson]

Hi,
         I'm trying to read a JPEG image and display it using  
vtkActor2D, but I cant seem to get it to work. What am I missing out  
here?

#include "qapplication.h"
#include <QtGui>

#include <vtkActor.h>
#include <vtkActor2D.h>
#include <vtkTextActor.h>
#include <vtkJPEGReader.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkImageMapper.h>

int main(int argc, char** argv)
{

   QApplication app(argc, argv);
	
#if QT_VERSION >= 0x040000
	Ui::Dialog ui;
	QDialog dialog;
#endif
	
	ui.setupUi(&dialog);
	dialog.setAttribute(Qt::WA_QuitOnClose);
	
	// Qt vtk integration
	vtkRenderer* ren;
	ren = vtkRenderer::New();
	ui.qvtkWidget->GetRenderWindow()->AddRenderer(ren);

	// Declare object instance variables
	vtkJPEGReader* imageReader;
	vtkImageMapper* imageMapper;
	vtkActor2D* mapActor;
	
	// Initialize objects
	imageReader = NULL;
	imageMapper = NULL;
	mapActor = NULL;
		
	// Read 2D image file
	imageReader = vtkJPEGReader::New();
		imageReader->SetFileName("sample.jpg");
	
	// Map 2D image file
	imageMapper = vtkImageMapper::New();
		imageMapper->SetInput(imageReader->GetOutput());
		imageMapper->GetInput();
		
	// Actor in scene
	mapActor = vtkActor2D::New();
		mapActor->SetMapper(imageMapper);	
		
	// Add Actor to renderer
	ren->AddActor2D(mapActor);

	// Reset camera
	ren->ResetCamera();
	
	// Render the scene
	ren->GetRenderWindow()->Render();
	
	// Display the dialog window
	dialog.show();

   return app.exec();
}

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