GeometricObjectsDemo
VTKExamples/Cxx/GeometricObjects/GeometricObjectsDemo
Code¶
GeometricObjectsDemo.cxx
#include <vtkSmartPointer.h> #include <vtkPolyDataMapper.h> #include <vtkTextMapper.h> #include <vtkActor.h> #include <vtkActor2D.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkArrowSource.h> #include <vtkConeSource.h> #include <vtkCubeSource.h> #include <vtkCylinderSource.h> #include <vtkDiskSource.h> #include <vtkLineSource.h> #include <vtkRegularPolygonSource.h> #include <vtkSphereSource.h> #include <vector> int main(int, char *[]) { // Create container to hold the 3D object generators (sources) std::vector<vtkSmartPointer<vtkPolyDataAlgorithm> > geometricObjectSources; // Populate the container with the various object sources to be demonstrated geometricObjectSources.push_back( vtkSmartPointer<vtkArrowSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkConeSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkCubeSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkCylinderSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkDiskSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkLineSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkRegularPolygonSource>::New() ); geometricObjectSources.push_back( vtkSmartPointer<vtkSphereSource>::New() ); // Create containers for the remaining nodes of each pipeline std::vector<vtkSmartPointer<vtkRenderer> > renderers; std::vector<vtkSmartPointer<vtkPolyDataMapper> > mappers; std::vector<vtkSmartPointer<vtkActor> > actors; std::vector<vtkSmartPointer<vtkTextMapper> > textmappers; std::vector<vtkSmartPointer<vtkActor2D> > textactors; // Create a mapper and actor for each object and the corresponding text label for( unsigned int i = 0; i < geometricObjectSources.size(); i++ ) { geometricObjectSources[i]->Update(); mappers.push_back( vtkSmartPointer<vtkPolyDataMapper>::New() ); mappers[i]->SetInputConnection( geometricObjectSources[i]->GetOutputPort() ); actors.push_back( vtkSmartPointer<vtkActor>::New() ); actors[i]->SetMapper( mappers[i] ); textmappers.push_back( vtkSmartPointer<vtkTextMapper>::New() ); textmappers[i]->SetInput( geometricObjectSources[i]->GetClassName() ); // set text label to the name of the object source textactors.push_back( vtkSmartPointer<vtkActor2D>::New() ); textactors[i]->SetMapper( textmappers[i] ); textactors[i]->SetPosition( 10, 10); // Note: the position of an Actor2D is specified in display coordinates } // Define size of the grid that will hold the objects int gridCols = 3; int gridRows = 3; // Define side length (in pixels) of each renderer square int rendererSize = 200; vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(rendererSize*gridCols, rendererSize*gridRows); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); // Set up a grid of viewports for each renderer for( double row = 0; row < gridRows; row++ ) { for( double col = 0; col < gridCols; col++ ) { double index = row*gridCols + col; // Create a renderer for this grid cell vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->SetBackground(.1, .2, .3); // Set the renderer's viewport dimensions (xmin, ymin, xmax, ymax) within the render window. // Note that for the Y values, we need to subtract the row index from gridRows // because the viewport Y axis points upwards, but we want to draw the grid from top to down double viewport[4] = { ((col ) * rendererSize) / (gridCols * rendererSize), ((gridRows - (row + 1)) * rendererSize) / (gridRows * rendererSize), ((col + 1) * rendererSize) / (gridCols * rendererSize), ((gridRows - (row )) * rendererSize) / (gridRows * rendererSize) }; renderer->SetViewport(viewport); // Add the corresponding actor and label for this grid cell, if they exist if( index < geometricObjectSources.size() ) { renderer->AddActor(actors[index]); renderer->AddActor(textactors[index]); } renderWindow->AddRenderer(renderer); } } vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); renderWindow->Render(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(GeometricObjectsDemo) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(GeometricObjectsDemo MACOSX_BUNDLE GeometricObjectsDemo.cxx) target_link_libraries(GeometricObjectsDemo ${VTK_LIBRARIES})
Download and Build GeometricObjectsDemo¶
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 GeometricObjectsDemo and its CMakeLists.txt file. Once the tarball GeometricObjectsDemo.tar has been downloaded and extracted,
cd GeometricObjectsDemo/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:
./GeometricObjectsDemo
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.