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DistancePointToLine

vtk-examples/Cxx/SimpleOperations/DistancePointToLine

Description

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

Other languages

See (CSharp)

Question

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

Code

DistancePointToLine.cxx

#include <vtkLine.h>
#include <vtkNew.h>
// #include <vtkPoints.h>

#include <iostream>
#include <string>

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};

  /*
  vtkNew<vtkLine> line;
  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 3.12 FATAL_ERROR)

project(DistancePointToLine)

find_package(VTK COMPONENTS 
)

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

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.