RubberBand2DObserver
vtk-examples/Cxx/Interaction/RubberBand2DObserver
Question
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Code¶
RubberBand2DObserver.cxx
#include <vtkActor.h>
#include <vtkCallbackCommand.h>
#include <vtkInteractorStyleRubberBand2D.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 <vtkSphereSource.h>
namespace {
void SelectionChangedCallbackFunction(vtkObject* caller,
long unsigned int eventId,
void* clientData, void* callData);
}
int main(int, char*[])
{
vtkNew<vtkNamedColors> colors;
vtkNew<vtkSphereSource> sphereSource;
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());
// A renderer and render window
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("RubberBand2DObserver");
// An interactor
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene
renderer->AddActor(actor);
renderer->SetBackground(colors->GetColor3d("SlateGray").GetData());
renderWindow->Render();
vtkNew<vtkCallbackCommand> selectionChangedCallback;
selectionChangedCallback->SetCallback(SelectionChangedCallbackFunction);
vtkNew<vtkInteractorStyleRubberBand2D> style;
style->AddObserver(vtkCommand::SelectionChangedEvent,
selectionChangedCallback);
renderWindowInteractor->SetInteractorStyle(style);
// Begin mouse interaction
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
namespace {
void SelectionChangedCallbackFunction(vtkObject* vtkNotUsed(caller),
long unsigned int vtkNotUsed(eventId),
void* vtkNotUsed(clientData),
void* callData)
{
std::cout << "SelectionChanged callback" << std::endl;
unsigned int* rect = reinterpret_cast<unsigned int*>(callData);
unsigned int pos1X = rect[0];
unsigned int pos1Y = rect[1];
unsigned int pos2X = rect[2];
unsigned int pos2Y = rect[3];
std::cout << "Start x: " << pos1X << " Start y: " << pos1Y
<< " End x: " << pos2X << " End y: " << pos2Y << std::endl;
}
} // namespace
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(RubberBand2DObserver)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping RubberBand2DObserver: ${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(RubberBand2DObserver MACOSX_BUNDLE RubberBand2DObserver.cxx )
target_link_libraries(RubberBand2DObserver PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(RubberBand2DObserver MACOSX_BUNDLE RubberBand2DObserver.cxx )
target_link_libraries(RubberBand2DObserver PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS RubberBand2DObserver
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build RubberBand2DObserver¶
Click here to download RubberBand2DObserver and its CMakeLists.txt file. Once the tarball RubberBand2DObserver.tar has been downloaded and extracted,
cd RubberBand2DObserver/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:
./RubberBand2DObserver
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.