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ArrayRange

vtk-examples/Cxx/Utilities/ArrayRange

Question

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Code

ArrayRange.cxx

#include <vtkFloatArray.h>
#include <vtkIntArray.h>
#include <vtkNew.h>

int main(int, char*[])
{
  /////////// Floats ///////////
  {
    vtkNew<vtkFloatArray> distances;
    distances->SetNumberOfComponents(1);
    distances->SetName("Distances");

    distances->InsertNextValue(5);
    distances->InsertNextValue(15);
    distances->InsertNextValue(25);

    // Get min and max
    double range[2];
    distances->GetRange(range);
    std::cout << "range = " << range[0] << " " << range[1] << std::endl;
  }

  /////////////// Ints //////////////
  {
    vtkNew<vtkIntArray> ints;
    ints->SetNumberOfComponents(1);
    ints->SetName("Ints");

    ints->InsertNextValue(5);
    ints->InsertNextValue(15);
    ints->InsertNextValue(25);

    // Get min and max
    int valuesRange[2];
    ints->GetValueRange(valuesRange); // Note this is not GetRange()!
    std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1]
              << std::endl;
  }

  /////////// Range with negative values ///////////
  {
    vtkNew<vtkIntArray> ints;
    ints->SetNumberOfComponents(1);
    ints->SetName("Ints");

    ints->InsertNextValue(-50);
    ints->InsertNextValue(15);
    ints->InsertNextValue(25);

    // Get min and max
    int valuesRange[2];
    ints->GetValueRange(valuesRange); // Note this is not GetRange()!
    std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1]
              << std::endl;
  }

  /////////// Magnitude range ///////////
  {
    vtkNew<vtkIntArray> ints;
    ints->SetNumberOfComponents(1);
    ints->SetName("Ints");

    ints->InsertNextValue(-50);
    ints->InsertNextValue(15);
    ints->InsertNextValue(25);

    // Get min and max
    int valuesRange[2];
    ints->GetValueRange(valuesRange, -1);
    std::cout << "valuesRange = " << valuesRange[0] << " " << valuesRange[1]
              << std::endl;
  }
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(ArrayRange)

find_package(VTK COMPONENTS 
  vtkCommonCore
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping ArrayRange: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(ArrayRange MACOSX_BUNDLE ArrayRange.cxx )
  target_link_libraries(ArrayRange PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(ArrayRange MACOSX_BUNDLE ArrayRange.cxx )
  target_link_libraries(ArrayRange PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS ArrayRange
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build ArrayRange

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

cd ArrayRange/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:

./ArrayRange

WINDOWS USERS

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