SeedWidgetWithCustomCallback
VTKExamples/Cxx/Widgets/SeedWidgetWithCustomCallback
Description
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.
Code
SeedWidgetWithCustomCallback.cxx
#include <vtkSmartPointer.h>
#include <vtkActor.h>
#include <vtkCommand.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyDataMapper.h>
#include <vtkSeedWidget.h>
#include <vtkSeedRepresentation.h>
#include <vtkPointHandleRepresentation2D.h>
#include <vtkProperty2D.h>
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(vtkSmartPointer<vtkSeedRepresentation> rep) {this->SeedRepresentation = rep;}
private:
vtkSmartPointer<vtkSeedRepresentation> SeedRepresentation;
};
int main(int, char *[])
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
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);
renderer->AddActor(actor);
// An interactor
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Create the representation
vtkSmartPointer<vtkPointHandleRepresentation2D> handle =
vtkSmartPointer<vtkPointHandleRepresentation2D>::New();
handle->GetProperty()->SetColor(1,0,0);
vtkSmartPointer<vtkSeedRepresentation> rep =
vtkSmartPointer<vtkSeedRepresentation>::New();
rep->SetHandleRepresentation(handle);
// Seed widget
vtkSmartPointer<vtkSeedWidget> seedWidget =
vtkSmartPointer<vtkSeedWidget>::New();
seedWidget->SetInteractor(renderWindowInteractor);
seedWidget->SetRepresentation(rep);
vtkSmartPointer<vtkSeedCallback> seedCallback =
vtkSmartPointer<vtkSeedCallback>::New();
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 2.8)
PROJECT(SeedWidgetWithCustomCallback)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(SeedWidgetWithCustomCallback MACOSX_BUNDLE SeedWidgetWithCustomCallback.cxx)
target_link_libraries(SeedWidgetWithCustomCallback ${VTK_LIBRARIES})
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.