DistanceBetweenPoints

VTKExamples/Cxx/SimpleOperations/DistanceBetweenPoints

Description

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

Other Languages

See (Python), (Java), (CSharp)

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 3.3 FATAL_ERROR)

project(DistanceBetweenPoints)

find_package(VTK COMPONENTS 
  vtkCommonCore QUIET)
if (NOT VTK_FOUND)
  message("Skipping DistanceBetweenPoints: ${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(DistanceBetweenPoints MACOSX_BUNDLE DistanceBetweenPoints.cxx )
  target_link_libraries(DistanceBetweenPoints PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(DistanceBetweenPoints MACOSX_BUNDLE DistanceBetweenPoints.cxx )
  target_link_libraries(DistanceBetweenPoints PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS DistanceBetweenPoints
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build DistanceBetweenPoints

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

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