DistancePointToLine

VTKExamples/Cxx/SimpleOperations/DistancePointToLine

Description

This example computes the distance from a point to a line.

Other Languages

See (CSharp)

Question

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Code

DistancePointToLine.cxx

#include <vtkSmartPointer.h>
#include <vtkLine.h>
#include <vtkPoints.h>

int main(int, char *[])
{
  double lineP0[3] = {0.0, 0.0, 0.0};
  double lineP1[3] = {2.0, 0.0, 0.0};

  double p0[3] = {1.0, 0, 0};
  double p1[3] = {1.0, 2.0, 0};

  /*
  vtkSmartPointer<vtkLine> line = 
    vtkSmartPointer<vtkLine>::New();
  line->GetPoints()->SetPoint(0, lineP0);
  line->GetPoints()->SetPoint(0, lineP1);
  */

  {
  double dist0 = vtkLine::DistanceToLine(p0, lineP0, lineP1);
  std::cout << "Dist0: " << dist0 << std::endl;

  double dist1 = vtkLine::DistanceToLine(p1, lineP0, lineP1);
  std::cout << "Dist1: " << dist1 << std::endl;
  }

  {
  double t;
  double closest[3];
  double dist0 = vtkLine::DistanceToLine(p0, lineP0, lineP1, t, closest);
  std::cout << "Dist0: " << dist0 << " closest point: " << closest[0] << " " << closest[1] << " " << closest[2] << std::endl;

  double dist1 = vtkLine::DistanceToLine(p1, lineP0, lineP1, t, closest);
  std::cout << "Dist1: " << dist1 << " closest point: " << closest[0] << " " << closest[1] << " " << closest[2] << std::endl;
  } 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(DistancePointToLine)

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

Download and Build DistancePointToLine

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

cd DistancePointToLine/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:

./DistancePointToLine

WINDOWS USERS

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