ClientData
vtk-examples/Cxx/Interaction/ClientData
Question
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Code¶
ClientData.cxx
#include <vtkActor.h>
#include <vtkCallbackCommand.h>
#include <vtkCommand.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
namespace {
void KeypressCallbackFunction(vtkObject* caller, long unsigned int eventId,
void* clientData, void* callData);
}
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
// Create a sphere
vtkNew<vtkSphereSource> sphereSource;
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(5.0);
sphereSource->Update();
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(sphereSource->GetOutputPort());
// Create an actor
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(colors->GetColor3d("Goldenrod").GetData());
// A renderer and render window
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
// An interactor
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkNew<vtkCallbackCommand> keypressCallback;
// Allow the observer to access the sphereSource
keypressCallback->SetClientData(sphereSource);
keypressCallback->SetCallback(KeypressCallbackFunction);
renderWindowInteractor->AddObserver(vtkCommand::KeyPressEvent,
keypressCallback);
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
renderWindow->SetWindowName("ClientData");
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
namespace {
void KeypressCallbackFunction(vtkObject*, long unsigned int vtkNotUsed(eventId),
void* clientData, void* vtkNotUsed(callData))
{
// Prove that we can access the sphere source
auto sphereSource = static_cast<vtkSphereSource*>(clientData);
std::cout << "Radius is " << sphereSource->GetRadius() << std::endl;
}
} // namespace
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(ClientData)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping ClientData: ${VTK_NOT_FOUND_MESSAGE}")
return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
# old system
include(${VTK_USE_FILE})
add_executable(ClientData MACOSX_BUNDLE ClientData.cxx )
target_link_libraries(ClientData PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(ClientData MACOSX_BUNDLE ClientData.cxx )
target_link_libraries(ClientData PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS ClientData
MODULES ${VTK_LIBRARIES}
)
endif ()
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
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.