ObserverMemberFunction
VTKExamples/Cxx/Interaction/ObserverMemberFunction
Description
You must use the git version of VTK from at least 10/11/2010 to use this functionality.
Code
ObserverMemberFunction.cxx
#include <vtkPolyDataMapper.h>
#include <vtkObjectFactory.h>
#include <vtkCommand.h>
#include <vtkActor.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyle.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkInteractorStyleTrackballCamera.h>
// A class not derived from vtkObjectBase
class MyClass
{
public:
void KeypressCallbackFunction(vtkObject*,
long unsigned int vtkNotUsed(eventId),
void* vtkNotUsed(callData))
{
std::cout << "Caught event in MyClass" << std::endl;
}
};
// A class that is derived from vtkObjectBase
class MyInteractorStyle : public vtkInteractorStyleTrackballCamera
{
public:
static MyInteractorStyle* New();
vtkTypeMacro(MyInteractorStyle, vtkInteractorStyleTrackballCamera);
void KeypressCallbackFunction(vtkObject*,
long unsigned int vtkNotUsed(eventId),
void* vtkNotUsed(callData) )
{
std::cout << "Caught event in MyInteractorStyle" << std::endl;
}
};
vtkStandardNewMacro(MyInteractorStyle);
int main(int, char *[])
{
// Create a sphere
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(5.0);
sphereSource->Update();
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
// Create an actor
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);
MyClass myClass;
renderWindowInteractor->AddObserver(vtkCommand::KeyPressEvent, &myClass, &MyClass::KeypressCallbackFunction);
MyInteractorStyle* style = MyInteractorStyle::New();
renderWindowInteractor->AddObserver(vtkCommand::KeyPressEvent, style, &MyInteractorStyle::KeypressCallbackFunction);
vtkSmartPointer<MyInteractorStyle> style2 =
vtkSmartPointer<MyInteractorStyle>::New();
renderWindowInteractor->AddObserver(vtkCommand::KeyPressEvent, style2, &MyInteractorStyle::KeypressCallbackFunction);
renderer->AddActor(actor);
renderer->SetBackground(1,1,1); // Background color white
renderWindow->Render();
renderWindowInteractor->Start();
style->Delete();
return EXIT_SUCCESS;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ObserverMemberFunction)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ObserverMemberFunction MACOSX_BUNDLE ObserverMemberFunction.cxx)
target_link_libraries(ObserverMemberFunction ${VTK_LIBRARIES})
Download and Build ObserverMemberFunction
Click here to download ObserverMemberFunction and its CMakeLists.txt file. Once the tarball ObserverMemberFunction.tar has been downloaded and extracted,
cd ObserverMemberFunction/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:
./ObserverMemberFunction
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.