# VTK/Examples/Cxx/SimpleOperations/DistancePointToLine

< VTK‎ | Examples‎ | Cxx

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

## 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;
}
```

# Please try the new VTKExamples website.

## CMakeLists.txt

```cmake_minimum_required(VERSION 2.8)

PROJECT(DistancePointToLine)

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

if(VTK_LIBRARIES)
else()
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.