# 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 ()


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.