KnownLengthArray
VTKExamples/Cxx/Utilities/KnownLengthArray
Description¶
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 VectorArrayKnownLength 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.
Code¶
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 2.8) PROJECT(KnownLengthArray) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(KnownLengthArray MACOSX_BUNDLE KnownLengthArray.cxx) target_link_libraries(KnownLengthArray ${VTK_LIBRARIES})
Download and Build KnownLengthArray¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download KnownLengthArray and its CMakeLists.txt file. Once the tarball KnownLengthArray.tar has been downloaded and extracted,
cd KnownLengthArray/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:
./KnownLengthArray
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.