CustomDenseArray

Description¶

The only thing you have to do to enable your class to work with vtkDenseArray is add a single line:

operator [vtkVariant](https://www.vtk.org/doc/nightly/html/classvtkVariant.html)() const { return [vtkVariant](https://www.vtk.org/doc/nightly/html/classvtkVariant.html)(); }

Question

If you have a question about this example, please use the VTK Discourse Forum

Code¶

CustomDenseArray.cxx

#include <vtkDenseArray.h>
#include <vtkNew.h>

struct Point
{
  double x, y;

  operator vtkVariant() const
  {
    return vtkVariant();
  }
};

int main(int, char*[])
{
  Point point;
  point.x = 1.0;
  point.y = 2.0;

  std::cout << point.x << " " << point.y << std::endl;

  vtkNew<vtkDenseArray<Point>> array;
  array->Resize(5, 5);

  array->SetValue(4, 4, point);

  Point retrievedPoint = array->GetValue(4, 4);
  std::cout << retrievedPoint.x << " " << retrievedPoint.y << std::endl;

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(CustomDenseArray)

find_package(VTK COMPONENTS 
  CommonCore
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "CustomDenseArray: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(CustomDenseArray MACOSX_BUNDLE CustomDenseArray.cxx )
  target_link_libraries(CustomDenseArray PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS CustomDenseArray
  MODULES ${VTK_LIBRARIES}
)

Download and Build CustomDenseArray¶

Click here to download CustomDenseArray and its CMakeLists.txt file. Once the tarball CustomDenseArray.tar has been downloaded and extracted,

cd CustomDenseArray/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:

./CustomDenseArray

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.