ArrayCalculator
VTKExamples/Cxx/Utilities/ArrayCalculator
Code
ArrayCalculator.cxx
#include <vtkVersion.h>
#include <vtkArrayCalculator.h>
#include <vtkDoubleArray.h>
#include <vtkPointData.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
int main(int, char *[])
{
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(1.0, 0.0, 0.0);
points->InsertNextPoint(2.0, 0.0, 0.0);
points->InsertNextPoint(3.0, 0.0, 0.0);
vtkSmartPointer<vtkDoubleArray> array =
vtkSmartPointer<vtkDoubleArray>::New();
array->SetName("orig");
array->InsertNextValue(1.0);
array->InsertNextValue(2.0);
array->InsertNextValue(3.0);
vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New();
polydata->SetPoints(points);
polydata->GetPointData()->AddArray(array);
vtkSmartPointer<vtkArrayCalculator> calc1 =
vtkSmartPointer<vtkArrayCalculator>::New();
#if VTK_MAJOR_VERSION <= 5
calc1->SetInput(polydata);
#else
calc1->SetInputData(polydata);
#endif
calc1->AddScalarArrayName("orig");
calc1->SetFunction("orig+1");
calc1->SetResultArrayName("orig");
calc1->Update();
vtkSmartPointer<vtkDoubleArray> output1 =
vtkDoubleArray::SafeDownCast(
calc1->GetPolyDataOutput()->GetPointData()->GetArray("orig"));
for(vtkIdType i = 0; i < output1->GetNumberOfTuples(); i++)
{
double val = output1->GetValue(i);
cout << "output1 value " << i << ": " << val << endl;
}
vtkSmartPointer<vtkArrayCalculator> calc2 =
vtkSmartPointer<vtkArrayCalculator>::New();
#if VTK_MAJOR_VERSION <= 5
calc2->SetInput(polydata);
#else
calc2->SetInputData(polydata);
#endif
calc2->AddScalarArrayName("orig");
calc2->SetFunction("if(orig=2,1,orig)");
calc2->SetResultArrayName("new");
calc2->Update();
vtkSmartPointer<vtkDoubleArray> output2 =
vtkDoubleArray::SafeDownCast(
calc2->GetPolyDataOutput()->GetPointData()->GetArray("new"));
for(vtkIdType i = 0; i < output2->GetNumberOfTuples(); i++)
{
double val = output2->GetValue(i);
cout << "output2 value " << i << ": " << val << endl;
}
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ArrayCalculator)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ArrayCalculator MACOSX_BUNDLE ArrayCalculator.cxx)
target_link_libraries(ArrayCalculator ${VTK_LIBRARIES})
Download and Build ArrayCalculator
Click here to download ArrayCalculator and its CMakeLists.txt file. Once the tarball ArrayCalculator.tar has been downloaded and extracted,
cd ArrayCalculator/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./ArrayCalculator
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.