VTK/Examples/Cxx/Utilities/KnownLengthArray

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This example creates a VTK style float array. This can be easily interchanged with vtkIntArray, vtkDoubleArray, etc.

The terminology is as follows:

  • SetNumberOfComponents(): sets the number of elements that a tuple in the array will have. See KnownLengthArrayOfVectors for an example with tuples with more than one element.
  • SetNumberOfValues(): sets the number of tuples the array will have. See UnknownLengthArray for an example where the number of values is not known in advance.

KnownLengthArray.cxx

#include <vtkSmartPointer.h>
#include <vtkFloatArray.h>
 
int main(int, char *[])
{
  vtkSmartPointer<vtkFloatArray> distances =
    vtkSmartPointer<vtkFloatArray>::New();
  distances->SetName("Distances");
  distances->SetNumberOfComponents(1);
  distances->SetNumberOfValues(5);
 
  //set values
  for(vtkIdType i = 0; i < distances->GetNumberOfTuples(); i++)
    {
    float f = (float)i + 0.1;
    distances->SetValue(i, f);
    }
 
  //get values
  for(vtkIdType i = 0; i < distances->GetNumberOfTuples(); i++)
    {
    float f = distances->GetValue(i);
    std::cout << f << std::endl;
    }
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
 
PROJECT(Array)
 
FIND_PACKAGE(VTK REQUIRED)
INCLUDE(${VTK_USE_FILE})
 
ADD_EXECUTABLE(KnownLengthArray KnownLengthArray.cxx)
TARGET_LINK_LIBRARIES(KnownLengthArray vtkHybrid)
Retrieved from "http://www.vtk.org/Wiki/VTK/Examples/Cxx/Utilities/KnownLengthArray"
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