VTK/Examples/Cxx/Utilities/PointInPolygon

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PointInPolygon.cxx

#include <vtkSmartPointer.h>
#include <vtkPoints.h>
#include <vtkPolygon.h>
 
int main(int, char *[])
{
  // Create the polygon
  vtkSmartPointer<vtkPolygon> polygon =
    vtkSmartPointer<vtkPolygon>::New();
  polygon->GetPoints()->InsertNextPoint(0.0, 0.0, 0.0);
  polygon->GetPoints()->InsertNextPoint(1.0, 0.0, 0.0);
  polygon->GetPoints()->InsertNextPoint(1.0, 1.0, 0.0);
  polygon->GetPoints()->InsertNextPoint(0.0, 1.0, 0.0);
 
  double testIn[3] = {0.5, 0.5, 0.0};
  double testOut[3] = {2.0, 0.5, 0.0};
 
  double n[3];
  polygon->ComputeNormal(polygon->GetPoints()->GetNumberOfPoints(),
          static_cast<double*>(polygon->GetPoints()->GetData()->GetVoidPointer(0)), n);
 
  double bounds[6];
  polygon->GetPoints()->GetBounds(bounds);
 
  std::cout << "testIn in polygon? " << polygon->PointInPolygon(testIn,
      polygon->GetPoints()->GetNumberOfPoints(), static_cast<double*>(
      polygon->GetPoints()->GetData()->GetVoidPointer(0)), bounds, n) << std::endl;
 
  std::cout << "testOut in polygon? " << polygon->PointInPolygon(testOut,
      polygon->GetPoints()->GetNumberOfPoints(), static_cast<double*>(
      polygon->GetPoints()->GetData()->GetVoidPointer(0)), bounds, n) << std::endl;
 
  /*
  std::cout << "New functions:" << std::endl;
 
  std::cout << "testIn in polygon? " << polygon->PointInPolygon(testIn) << std::endl;
 
  std::cout << "testOut in polygon? " << polygon->PointInPolygon(testOut) << std::endl;
  */
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(PointInPolygon)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
add_executable(PointInPolygon MACOSX_BUNDLE PointInPolygon.cxx)
 
if(VTK_LIBRARIES)
  target_link_libraries(PointInPolygon ${VTK_LIBRARIES})
else()
  target_link_libraries(PointInPolygon vtkHybrid vtkWidgets)
endif()

Download and Build PointInPolygon

Click here to download PointInPolygon. and its CMakeLists.txt file.

Once the tarball PointInPolygon.tar has been downloaded and extracted,

cd PointInPolygon/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:

./PointInPolygon

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.