HighlightPickedActor
VTKExamples/Cxx/Picking/HighlightPickedActor
Description¶
Click on a sphere to highlight it.
Code¶
HighlightPickedActor.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkMath.h> #include <vtkActor.h> #include <vtkProperty.h> #include <vtkSphereSource.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkObjectFactory.h> #include <vtkSphereSource.h> #include <vtkPolyDataMapper.h> #include <vtkPropPicker.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> // Handle mouse events class MouseInteractorHighLightActor : public vtkInteractorStyleTrackballCamera { public: static MouseInteractorHighLightActor* New(); vtkTypeMacro(MouseInteractorHighLightActor, vtkInteractorStyleTrackballCamera); MouseInteractorHighLightActor() { LastPickedActor = NULL; LastPickedProperty = vtkProperty::New(); } virtual ~MouseInteractorHighLightActor() { LastPickedProperty->Delete(); } virtual void OnLeftButtonDown() { int* clickPos = this->GetInteractor()->GetEventPosition(); // Pick from this location. vtkSmartPointer<vtkPropPicker> picker = vtkSmartPointer<vtkPropPicker>::New(); picker->Pick(clickPos[0], clickPos[1], 0, this->GetDefaultRenderer()); // If we picked something before, reset its property if (this->LastPickedActor) { this->LastPickedActor->GetProperty()->DeepCopy(this->LastPickedProperty); } this->LastPickedActor = picker->GetActor(); if (this->LastPickedActor) { // Save the property of the picked actor so that we can // restore it next time this->LastPickedProperty->DeepCopy(this->LastPickedActor->GetProperty()); // Highlight the picked actor by changing its properties this->LastPickedActor->GetProperty()->SetColor(1.0, 0.0, 0.0); this->LastPickedActor->GetProperty()->SetDiffuse(1.0); this->LastPickedActor->GetProperty()->SetSpecular(0.0); } // Forward events vtkInteractorStyleTrackballCamera::OnLeftButtonDown(); } private: vtkActor *LastPickedActor; vtkProperty *LastPickedProperty; }; vtkStandardNewMacro(MouseInteractorHighLightActor); // Execute application. int main(int argc, char *argv[]) { int numberOfSpheres = 10; if (argc > 1) { numberOfSpheres = atoi(argv[1]); } // 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 ); // Set the custom type to use for interaction. vtkSmartPointer<MouseInteractorHighLightActor> style = vtkSmartPointer<MouseInteractorHighLightActor>::New(); style->SetDefaultRenderer(renderer); renderWindowInteractor->SetInteractorStyle( style ); for (int i = 0; i < numberOfSpheres; ++i) { vtkSmartPointer<vtkSphereSource> source = vtkSmartPointer<vtkSphereSource>::New(); double x, y, z, radius; x = vtkMath::Random(-5,5); y = vtkMath::Random(-5,5); z = vtkMath::Random(-5,5); radius = vtkMath::Random(.5, 1.0); source->SetRadius(radius); source->SetCenter(x, y, z); source->SetPhiResolution(11); source->SetThetaResolution(21); vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection ( source->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper ( mapper ); double r, g, b; r = vtkMath::Random(.4, 1.0); g = vtkMath::Random(.4, 1.0); b = vtkMath::Random(.4, 1.0); actor->GetProperty()->SetDiffuseColor(r, g, b); actor->GetProperty()->SetDiffuse(.8); actor->GetProperty()->SetSpecular(.5); actor->GetProperty()->SetSpecularColor(1.0,1.0,1.0); actor->GetProperty()->SetSpecularPower(30.0); renderer->AddActor ( actor ); } renderer->SetBackground ( .3, .4, .5 ); // Render and interact renderWindow->Render(); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(HighlightPickedActor) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(HighlightPickedActor MACOSX_BUNDLE HighlightPickedActor.cxx) target_link_libraries(HighlightPickedActor ${VTK_LIBRARIES})
Download and Build HighlightPickedActor¶
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 HighlightPickedActor and its CMakeLists.txt file. Once the tarball HighlightPickedActor.tar has been downloaded and extracted,
cd HighlightPickedActor/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:
./HighlightPickedActor
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.