SeedWidgetWithCustomCallback
vtk-examples/Cxx/Widgets/SeedWidgetWithCustomCallback
Descriptionn¶
This example demonstrates how to place seed points in the scene. The seed points can be used for operations like connectivity, segmentation, and region growing.
Question
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Code¶
SeedWidgetWithCustomCallback.cxx
#include <vtkActor.h>
#include <vtkCommand.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPointHandleRepresentation2D.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkProperty2D.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSeedRepresentation.h>
#include <vtkSeedWidget.h>
#include <vtkSphereSource.h>
namespace {
class vtkSeedCallback : public vtkCommand
{
public:
static vtkSeedCallback* New()
{
return new vtkSeedCallback;
}
vtkSeedCallback()
{
}
virtual void Execute(vtkObject*, unsigned long event, void* calldata)
{
if (event == vtkCommand::PlacePointEvent)
{
std::cout << "Point placed, total of: "
<< this->SeedRepresentation->GetNumberOfSeeds() << std::endl;
}
if (event == vtkCommand::InteractionEvent)
{
if (calldata)
{
std::cout << "Interacting with seed : "
<< *(static_cast<int*>(calldata)) << std::endl;
}
}
std::cout << "List of seeds (Display coordinates):" << std::endl;
for (vtkIdType i = 0; i < this->SeedRepresentation->GetNumberOfSeeds(); i++)
{
double pos[3];
this->SeedRepresentation->GetSeedDisplayPosition(i, pos);
std::cout << "(" << pos[0] << " " << pos[1] << " " << pos[2] << ")"
<< std::endl;
}
}
void SetRepresentation(vtkSeedRepresentation* rep)
{
this->SeedRepresentation = rep;
}
private:
vtkSeedRepresentation* SeedRepresentation;
};
} // namespace
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
vtkNew<vtkSphereSource> sphereSource;
sphereSource->Update();
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(colors->GetColor3d("MidnightBlue").GetData());
// A renderer and render window
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("SeedWidgetWithCustomCallback");
renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
renderer->AddActor(actor);
// An interactor
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Create the representation
vtkNew<vtkPointHandleRepresentation2D> handle;
handle->GetProperty()->SetColor(colors->GetColor3d("Red").GetData());
vtkNew<vtkSeedRepresentation> rep;
rep->SetHandleRepresentation(handle);
// Seed widget
vtkNew<vtkSeedWidget> seedWidget;
seedWidget->SetInteractor(renderWindowInteractor);
seedWidget->SetRepresentation(rep);
vtkNew<vtkSeedCallback> seedCallback;
seedCallback->SetRepresentation(rep);
seedWidget->AddObserver(vtkCommand::PlacePointEvent, seedCallback);
seedWidget->AddObserver(vtkCommand::InteractionEvent, seedCallback);
renderWindow->Render();
renderWindowInteractor->Initialize();
renderWindow->Render();
seedWidget->On();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(SeedWidgetWithCustomCallback)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkFiltersSources
vtkInteractionStyle
vtkInteractionWidgets
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping SeedWidgetWithCustomCallback: ${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(SeedWidgetWithCustomCallback MACOSX_BUNDLE SeedWidgetWithCustomCallback.cxx )
target_link_libraries(SeedWidgetWithCustomCallback PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(SeedWidgetWithCustomCallback MACOSX_BUNDLE SeedWidgetWithCustomCallback.cxx )
target_link_libraries(SeedWidgetWithCustomCallback PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS SeedWidgetWithCustomCallback
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build SeedWidgetWithCustomCallback¶
Click here to download SeedWidgetWithCustomCallback and its CMakeLists.txt file. Once the tarball SeedWidgetWithCustomCallback.tar has been downloaded and extracted,
cd SeedWidgetWithCustomCallback/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:
./SeedWidgetWithCustomCallback
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.