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 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.
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
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.