VTK Multiple viewports

gistfile1.txt

#include <vtkSphereSource.h>
#include <vtkProperty.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>

#include <vtkButtonWidget.h>
#include <vtkTexturedButtonRepresentation2D.h>
#include <vtkImageActor.h>
#include <vtkPNGReader.h>
#include <vtkImageData.h>


#include <vtksys/ios/sstream>

void SetupButton(vtkSmartPointer<vtkRenderWindowInteractor> iren,
                 vtkSmartPointer<vtkRenderer> &renderer,
                 vtkSmartPointer<vtkButtonWidget> &button,
                 const char* image_path,
                 double xmin, double xmax, double ymin, double ymax);

 
int main(int, char *[])
{
  vtkSmartPointer<vtkRenderWindow> renderWindow = 
    vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
 
  renderWindowInteractor->SetRenderWindow(renderWindow);
 
  // Define viewport ranges
  double xmins[4] = {0,.5,0,.5};
  double xmaxs[4] = {0.5,1,0.5,1};
  double ymins[4] = {0,0,.5,.5};
  double ymaxs[4]= {0.5,0.5,1,1};
  for(unsigned i = 0; i < 4; i++)
    {
      vtkSmartPointer<vtkRenderer> renderer = 
        vtkSmartPointer<vtkRenderer>::New();
 
      renderWindow->AddRenderer(renderer);
      renderer->SetViewport(xmins[i],ymins[i],xmaxs[i],ymaxs[i]);
 
      // Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource = 
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->SetCenter(0.0, 0.0, 0.0);
      sphereSource->SetRadius(5);
      sphereSource->Update();
 
      // Create a mapper and actor
      vtkSmartPointer<vtkPolyDataMapper> mapper = 
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
      actor->SetMapper(mapper);
      renderer->AddActor(actor);
      renderer->ResetCamera();

      vtkSmartPointer<vtkButtonWidget> button;
      SetupButton(renderWindowInteractor, 
                  renderer, button, "plus.png", 0, 0.3, 0, 0.3);

      renderWindow->Render();
      renderWindow->SetWindowName("Multiple ViewPorts");
    }
 
  renderWindowInteractor->Start();
 
  return EXIT_SUCCESS;
}

void SetupButton(vtkSmartPointer<vtkRenderWindowInteractor> iren,
                 vtkSmartPointer<vtkRenderer> &renderer,
                 vtkSmartPointer<vtkButtonWidget> &button,
                 const char* image_path,
                 double xmin, double xmax, double ymin, double ymax)
{
  button = vtkSmartPointer<vtkButtonWidget>::New();
  vtkSmartPointer<vtkTexturedButtonRepresentation2D> buttonRepresent = vtkSmartPointer<vtkTexturedButtonRepresentation2D>::New();
  vtkSmartPointer<vtkPNGReader> pngReader = vtkSmartPointer<vtkPNGReader>::New();
  vtkSmartPointer<vtkImageData> image = vtkSmartPointer<vtkImageData>::New();
  pngReader->SetFileName(image_path);
  pngReader->Update();
  image = pngReader->GetOutput();
  buttonRepresent->SetNumberOfStates(1);
  buttonRepresent->SetButtonTexture(0, image);
  button->SetInteractor(iren);
  button->SetRepresentation(buttonRepresent);

  // Setup bounding box
  double bound1[6];
  bound1[0] = xmin;
  bound1[1] = xmax;
  bound1[2] = ymin;
  bound1[3] = ymax;
  bound1[4] = bound1[5] = 0.0;

  buttonRepresent->SetPlaceFactor(1);
  buttonRepresent->PlaceWidget(bound1);
  button->SetCurrentRenderer(renderer);
  button->EnabledOn();
}