BorderWidget
VTKExamples/Cxx/Widgets/BorderWidget
Description¶
This example draws a border around a region selected with the mouse. Note that the default border color is white - so if you have a white background you will not see anything!
Code¶
BorderWidget.cxx
#include <vtkSmartPointer.h> #include <vtkWidgetCallbackMapper.h> #include <vtkCommand.h> #include <vtkWidgetEvent.h> #include <vtkObjectFactory.h> #include <vtkActor.h> #include <vtkBorderRepresentation.h> #include <vtkBorderWidget.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkSphereSource.h> class vtkCustomBorderWidget : public vtkBorderWidget { public: static vtkCustomBorderWidget *New(); vtkTypeMacro(vtkCustomBorderWidget, vtkBorderWidget); static void EndSelectAction(vtkAbstractWidget *w); vtkCustomBorderWidget(); }; vtkStandardNewMacro(vtkCustomBorderWidget); vtkCustomBorderWidget::vtkCustomBorderWidget() { this->CallbackMapper->SetCallbackMethod(vtkCommand::MiddleButtonReleaseEvent, vtkWidgetEvent::EndSelect, this, vtkCustomBorderWidget::EndSelectAction); } void vtkCustomBorderWidget::EndSelectAction(vtkAbstractWidget *w) { vtkBorderWidget *borderWidget = vtkBorderWidget::SafeDownCast(w); // Get the actual box coordinates/planes vtkSmartPointer<vtkPolyData> polydata = vtkSmartPointer<vtkPolyData>::New(); // Get the bottom left corner double* lowerLeft; lowerLeft = static_cast<vtkBorderRepresentation*>(borderWidget->GetRepresentation())->GetPosition(); std::cout << "Lower left: " << lowerLeft[0] << " " << lowerLeft[1] << std::endl; double* upperRight; upperRight = static_cast<vtkBorderRepresentation*>(borderWidget->GetRepresentation())->GetPosition2(); std::cout << "Upper right: " << upperRight[0] << " " << upperRight[1] << std::endl; vtkBorderWidget::EndSelectAction(w); } int main(int, char *[]) { // Sphere vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetRadius(4.0); sphereSource->Update(); vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // A renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // An interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkCustomBorderWidget> borderWidget = vtkSmartPointer<vtkCustomBorderWidget>::New(); borderWidget->SetInteractor(renderWindowInteractor); borderWidget->CreateDefaultRepresentation(); borderWidget->SelectableOff(); // Add the actors to the scene renderer->AddActor(actor); // Render an image (lights and cameras are created automatically) renderWindowInteractor->Initialize(); renderWindow->Render(); borderWidget->On(); // Begin mouse interaction renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(BorderWidget) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(BorderWidget MACOSX_BUNDLE BorderWidget.cxx) target_link_libraries(BorderWidget ${VTK_LIBRARIES})
Download and Build BorderWidget¶
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 BorderWidget and its CMakeLists.txt file. Once the tarball BorderWidget.tar has been downloaded and extracted,
cd BorderWidget/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:
./BorderWidget
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.