Polygon
VTKExamples/Cxx/GeometricObjects/Polygon
Code¶
Polygon.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkPolygon.h> #include <vtkCellArray.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> int main(int, char *[]) { // Setup four points vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New(); points->InsertNextPoint(0.0, 0.0, 0.0); points->InsertNextPoint(1.0, 0.0, 0.0); points->InsertNextPoint(1.0, 1.0, 0.0); points->InsertNextPoint(0.0, 1.0, 0.0); // Create the polygon vtkSmartPointer<vtkPolygon> polygon = vtkSmartPointer<vtkPolygon>::New(); polygon->GetPointIds()->SetNumberOfIds(4); //make a quad polygon->GetPointIds()->SetId(0, 0); polygon->GetPointIds()->SetId(1, 1); polygon->GetPointIds()->SetId(2, 2); polygon->GetPointIds()->SetId(3, 3); // Add the polygon to a list of polygons vtkSmartPointer<vtkCellArray> polygons = vtkSmartPointer<vtkCellArray>::New(); polygons->InsertNextCell(polygon); // Create a PolyData vtkSmartPointer<vtkPolyData> polygonPolyData = vtkSmartPointer<vtkPolyData>::New(); polygonPolyData->SetPoints(points); polygonPolyData->SetPolys(polygons); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); #if VTK_MAJOR_VERSION <= 5 mapper->SetInput(polygonPolyData); #else mapper->SetInputData(polygonPolyData); #endif vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // Visualize vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderer->AddActor(actor); renderer->SetBackground(.5,.3,.31); // Background color salmon renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(Polygon) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(Polygon MACOSX_BUNDLE Polygon.cxx) target_link_libraries(Polygon ${VTK_LIBRARIES})
Download and Build Polygon¶
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 Some tarballs may be missing or out-of-date.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 Polygon and its CMakeLists.txt file. Once the tarball Polygon.tar has been downloaded and extracted,
cd Polygon/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:
./Polygon
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.