ClientData
VTKExamples/Cxx/Interaction/ClientData
Code
ClientData.cxx
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkCallbackCommand.h>
#include <vtkCommand.h>
static void KeypressCallbackFunction ( vtkObject* caller, long unsigned int eventId,
void* clientData, void* callData );
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);
vtkSmartPointer<vtkCallbackCommand> keypressCallback =
vtkSmartPointer<vtkCallbackCommand>::New();
// Allow the observer to access the sphereSource
keypressCallback->SetClientData(sphereSource);
keypressCallback->SetCallback(KeypressCallbackFunction );
renderWindowInteractor->AddObserver(vtkCommand::KeyPressEvent, keypressCallback);
renderer->AddActor(actor);
renderer->SetBackground(1,1,1); // Background color white
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
void KeypressCallbackFunction(vtkObject*, long unsigned int vtkNotUsed(eventId), void* clientData, void* vtkNotUsed(callData) )
{
// Prove that we can access the sphere source
vtkSphereSource* sphereSource =
static_cast<vtkSphereSource*>(clientData);
std::cout << "Radius is " << sphereSource->GetRadius() << std::endl;
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ClientData)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ClientData MACOSX_BUNDLE ClientData.cxx)
target_link_libraries(ClientData ${VTK_LIBRARIES})
Download and Build ClientData
Click here to download ClientData and its CMakeLists.txt file. Once the tarball ClientData.tar has been downloaded and extracted,
cd ClientData/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:
./ClientData
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.