[vtkusers] How to read and display a JPEG image

[Miguel Angel Rodriguez Florido]

	I haven't seen your email in detail, but perhaps, you need to add 
reader Update method to your pipeline.

	Hth.

Elvis Dowson wrote:
> 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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-- 
Miguel Angel Rodríguez Florido
Departamento de Ingeniería del Software
División de Investigación y Desarrollo Tecnológico
INSTITUTO TECNOLOGICO DE CANARIAS, S.A. - GOBIERNO DE CANARIAS
URL: www.itccanarias.org Tlfno: +34 928 727548, Fax: +34 928 727517

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