ArrayRange

Question

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

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 3.12 FATAL_ERROR)

project(ArrayRange)

find_package(VTK COMPONENTS 
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "ArrayRange: 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(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}
)

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.