# DistancePointToLine

vtk-examples/Cxx/SimpleOperations/DistancePointToLine

### Description¶

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

Other languages

See (CSharp)

Question

### 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
CommonCore
CommonDataModel
)

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.")
target_link_libraries(DistancePointToLine PRIVATE ${VTK_LIBRARIES} ) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS DistancePointToLine MODULES${VTK_LIBRARIES}
)


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.