PointInPolygon
VTKExamples/Cxx/Utilities/PointInPolygon
Code¶
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) target_link_libraries(PointInPolygon ${VTK_LIBRARIES})
Download and Build PointInPolygon¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
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.