# DistancePointToLine

VTKExamples/Cxx/SimpleOperations/DistancePointToLine

### Description

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

### 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 2.8)

    PROJECT(DistancePointToLine)

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

    add_executable(DistancePointToLine MACOSX_BUNDLE DistancePointToLine.cxx )

    target_link_libraries(DistancePointToLine ${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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.