VTK/Examples/Cxx/ImageData/GetCellCenter

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Unfortunately this function is not built in directly, but rather quite convoluted to call. This is an easy to use wrapper.

GetCellCenter.cxx

#include <vtkSmartPointer.h>
#include <vtkCell.h>
#include <vtkImageData.h>
 
static void GetCellCenter(vtkImageData* imageData, const unsigned int cellId, double center[3]);
 
int main(int, char *[])
{
  // Create an image data
  vtkSmartPointer<vtkImageData> imageData = vtkSmartPointer<vtkImageData>::New();
 
  // Specify the size of the image data
  imageData->SetDimensions(3,3,2); // This will cause 18 points and 4 cells
  imageData->SetSpacing(1.0, 1.0, 1.0);
  imageData->SetOrigin(0.0, 0.0, 0.0);
 
  std::cout << "Number of points: " << imageData->GetNumberOfPoints() << std::endl;
  std::cout << "Number of cells: " << imageData->GetNumberOfCells() << std::endl;
 
  double center[3] = {0,0,0};
  for(unsigned int cellId = 0; cellId < imageData->GetNumberOfCells(); ++cellId)
    {
    GetCellCenter(imageData, cellId, center);
 
    std::cout << "Cell " << cellId << " center: " << center[0] << " " << center[1] << " " << center[2] << std::endl;
    }
 
  return EXIT_SUCCESS;
}
 
void GetCellCenter(vtkImageData* imageData, const unsigned int cellId, double center[3])
{
  double pcoords[3] = {0,0,0};
  double *weights = new double [imageData->GetMaxCellSize()];
  vtkCell* cell = imageData->GetCell(cellId);
  int subId = cell->GetParametricCenter(pcoords);
  cell->EvaluateLocation(subId, pcoords, center, weights);
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(CellIdFromGridCoordinates)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
if (APPLE)
  add_executable(CellIdFromGridCoordinates MACOSX_BUNDLE CellIdFromGridCoordinates.cxx)
else()
  add_executable(CellIdFromGridCoordinates CellIdFromGridCoordinates.cxx)
endif()
 
if(VTK_LIBRARIES)
  target_link_libraries(CellIdFromGridCoordinates ${VTK_LIBRARIES})
else()
  target_link_libraries(CellIdFromGridCoordinates vtkHybrid )
endif()
Retrieved from "http://batchmake.org/Wiki/VTK/Examples/Cxx/ImageData/GetCellCenter"
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