SeedWidget
Description¶
This example demonstrates how to use vtkSeedWidget, which generates (seeds) points to be placed in the scene in the locations where the user clicks.
The points can then be used for operations like connectivity, segmentation, and region growing. For an example using a custom callback where such operations can be assembled, see SeedWidgetWithCustomCallback.
Other languages
See (Java)
Question
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Code¶
SeedWidget.cxx
#include <vtkPointHandleRepresentation2D.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty2D.h> // For setting the color in the handles
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSeedRepresentation.h>
#include <vtkSeedWidget.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
int main(int vtkNotUsed(argc), char* vtkNotUsed(argv)[])
{
auto sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
// Create a mapper and actor
auto mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
auto actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
auto renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddActor(actor);
auto window =
vtkSmartPointer<vtkRenderWindow>::New();
window->AddRenderer(renderer);
auto interactor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
interactor->SetRenderWindow(window);
// Create the representation for the seed widget and for its handles
auto handleRep =
vtkSmartPointer<vtkPointHandleRepresentation2D>::New();
handleRep->GetProperty()->SetColor(1, 1, 0); // Make the handles yellow
auto widgetRep =
vtkSmartPointer<vtkSeedRepresentation>::New();
widgetRep->SetHandleRepresentation(handleRep);
// Create the seed widget
auto seedWidget =
vtkSmartPointer<vtkSeedWidget>::New();
seedWidget->SetInteractor(interactor);
seedWidget->SetRepresentation(widgetRep);
seedWidget->On();
window->Render();
interactor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(SeedWidget)
find_package(VTK COMPONENTS
vtkvtkCommonCore
vtkvtkFiltersSources
vtkvtkInteractionStyle
vtkvtkInteractionWidgets
vtkvtkRenderingContextOpenGL2
vtkvtkRenderingCore
vtkvtkRenderingFreeType
vtkvtkRenderingGL2PSOpenGL2
vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
message("Skipping SeedWidget: ${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(SeedWidget MACOSX_BUNDLE SeedWidget.cxx )
target_link_libraries(SeedWidget PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(SeedWidget MACOSX_BUNDLE SeedWidget.cxx )
target_link_libraries(SeedWidget PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS SeedWidget
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build SeedWidget¶
Click here to download SeedWidget and its CMakeLists.txt file. Once the tarball SeedWidget.tar has been downloaded and extracted,
cd SeedWidget/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:
./SeedWidget
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.