Function main

Examples/DataManipulation/Cxx/Arrays.cxx:25–115

#include <array>

int main()
{
  vtkNew<vtkNamedColors> colors;

  // Create a float array which represents the points.
  vtkNew<vtkDoubleArray> pcoords;

  // Note that by default, an array has 1 component.
  // We have to change it to 3 for points.
  pcoords->SetNumberOfComponents(3);
  // We ask pcoords to allocate room for at least 4 tuples
  // and set the number of tuples to 4.
  pcoords->SetNumberOfTuples(4);
  // Assign each tuple. There are 5 specialized versions of SetTuple:
  // SetTuple1 SetTuple2 SetTuple3 SetTuple4 SetTuple9
  // These take 1, 2, 3, 4 and 9 components respectively.
  std::array<std::array<double, 3>, 4> pts = { { { { 0.0, 0.0, 0.0 } }, { { 0.0, 1.0, 0.0 } },
    { { 1.0, 0.0, 0.0 } }, { { 1.0, 1.0, 0.0 } } } };
  for (auto i = 0ul; i < pts.size(); ++i)
  {
    pcoords->SetTuple(i, pts[i].data());
  }

  // Create vtkPoints and assign pcoords as the internal data array.
  vtkNew<vtkPoints> points;
  points->SetData(pcoords);

  // Create the cells. In this case, a triangle strip with 2 triangles
  // (which can be represented by 4 points).
  vtkNew<vtkCellArray> strips;
  strips->InsertNextCell(4);
  strips->InsertCellPoint(0);
  strips->InsertCellPoint(1);
  strips->InsertCellPoint(2);
  strips->InsertCellPoint(3);

  // Create an integer array with 4 tuples. Note that when using
  // InsertNextValue (or InsertNextTuple1 which is equivalent in
  // this situation), the array will expand automatically.
  vtkNew<vtkIntArray> temperature;
  temperature->SetName("Temperature");
  temperature->InsertNextValue(10);
  temperature->InsertNextValue(20);
  temperature->InsertNextValue(30);
  temperature->InsertNextValue(40);

  // Create a double array.
  vtkNew<vtkDoubleArray> vorticity;
  vorticity->SetName("Vorticity");
  vorticity->InsertNextValue(2.7);
  vorticity->InsertNextValue(4.1);
  vorticity->InsertNextValue(5.3);
  vorticity->InsertNextValue(3.4);

  // Create the dataset. In this case, we create a vtkPolyData
  vtkNew<vtkPolyData> polydata;
  // Assign points and cells
  polydata->SetPoints(points);