# DistanceBetweenPoints

VTKExamples/Cxx/SimpleOperations/DistanceBetweenPoints

### Description

This example finds the squared distance and the Euclidean distance between two 3D points.

### Code

DistanceBetweenPoints.cxx

    #include <vtkMath.h>

    int main(int, char *[])
    {
      // Create two points.
      double p0[3] = {0.0, 0.0, 0.0};
      double p1[3] = {1.0, 1.0, 1.0};

      // Find the squared distance between the points.
      double squaredDistance = vtkMath::Distance2BetweenPoints(p0, p1);

      // Take the square root to get the Euclidean distance between the points.
      double distance = sqrt(squaredDistance);

      // Output the results.
      std::cout << "SquaredDistance = " << squaredDistance << std::endl;
      std::cout << "Distance = " << distance << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(DistanceBetweenPoints)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(DistanceBetweenPoints MACOSX_BUNDLE DistanceBetweenPoints.cxx)

    target_link_libraries(DistanceBetweenPoints ${VTK_LIBRARIES})

### Download and Build DistanceBetweenPoints

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 Some tarballs may be missing or out-of-date.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 DistanceBetweenPoints and its CMakeLists.txt file. Once the tarball DistanceBetweenPoints.tar has been downloaded and extracted,

    cd DistanceBetweenPoints/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:

    ./DistanceBetweenPoints

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.