MoveAGlyph
vtk-examples/Cxx/Interaction/MoveAGlyph
Description¶
This example allows the user to reposition a glyph. It does this by faking the interactor into thinking that a new actor (MoveActor) is the object to be interacted with. We use the array generated by glyph3D->GeneratePointIdsOn() to determine the point associated with the glyph that the user selected. A "ghost" actor of the selected glyph is generated (because all of the glyphs are part of the same actor, so they would all move together). This actor is moved, and its final position is used to update the point in the original data set.
Question
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Code¶
MoveAGlyph.cxx
#include <vtkActor.h>
#include <vtkAreaPicker.h>
#include <vtkCamera.h>
#include <vtkCellPicker.h>
#include <vtkDataSetMapper.h>
#include <vtkDataSetSurfaceFilter.h>
#include <vtkExtractGeometry.h>
#include <vtkGlyph3D.h>
#include <vtkIdFilter.h>
#include <vtkIdTypeArray.h>
#include <vtkInteractorStyleTrackballActor.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkObjectFactory.h>
#include <vtkPlanes.h>
#include <vtkPointData.h>
#include <vtkPointSource.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkRendererCollection.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkUnstructuredGrid.h>
#include <vtkVertexGlyphFilter.h>
namespace {
// Define interaction style
class InteractorStyleMoveGlyph : public vtkInteractorStyleTrackballActor
{
public:
static InteractorStyleMoveGlyph* New();
vtkTypeMacro(InteractorStyleMoveGlyph, vtkInteractorStyleTrackballActor);
InteractorStyleMoveGlyph()
{
this->MoveSphereSource = vtkSmartPointer<vtkSphereSource>::New();
this->MoveSphereSource->SetRadius(.1);
this->MoveSphereSource->Update();
this->MoveMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
this->MoveMapper->SetInputConnection(
this->MoveSphereSource->GetOutputPort());
this->MoveActor = vtkSmartPointer<vtkActor>::New();
this->MoveActor->SetMapper(this->MoveMapper);
this->MoveActor->GetProperty()->SetColor(
this->color->GetColor3d("Pink").GetData());
// this->MoveActor->VisibilityOff();
this->Move = false;
}
void OnMouseMove() override
{
if (!this->Move)
{
return;
}
vtkInteractorStyleTrackballActor::OnMouseMove();
}
void OnMiddleButtonUp() override
{
// Forward events
vtkInteractorStyleTrackballActor::OnMiddleButtonUp();
this->Move = false;
this->MoveActor->VisibilityOff();
this->Data->GetPoints()->SetPoint(this->SelectedPoint,
this->MoveActor->GetPosition());
this->Data->Modified();
this->GetCurrentRenderer()->Render();
this->GetCurrentRenderer()->GetRenderWindow()->Render();
}
void OnMiddleButtonDown() override
{
// Forward events
vtkInteractorStyleTrackballActor::OnMiddleButtonDown();
this->MoveActor->VisibilityOn();
if (static_cast<vtkCellPicker*>(this->InteractionPicker)->GetPointId() >= 0)
{
vtkIdType id =
dynamic_cast<vtkIdTypeArray*>(
this->GlyphData->GetPointData()->GetArray("InputPointIds"))
->GetValue(static_cast<vtkCellPicker*>(this->InteractionPicker)
->GetPointId());
std::cout << "Id: " << id << std::endl;
this->Move = true;
this->SelectedPoint = id;
double p[3];
this->Data->GetPoint(id, p);
std::cout << "p: " << p[0] << " " << p[1] << " " << p[2] << std::endl;
this->MoveActor->SetPosition(p);
}
this->GetCurrentRenderer()->AddActor(this->MoveActor);
this->InteractionProp = this->MoveActor;
}
vtkNew<vtkNamedColors> color;
vtkPolyData* Data;
vtkPolyData* GlyphData;
vtkSmartPointer<vtkPolyDataMapper> MoveMapper;
vtkSmartPointer<vtkActor> MoveActor;
vtkSmartPointer<vtkSphereSource> MoveSphereSource;
bool Move;
vtkIdType SelectedPoint;
};
vtkStandardNewMacro(InteractorStyleMoveGlyph);
} // namespace
int main(int, char*[])
{
vtkNew<vtkNamedColors> color;
vtkNew<vtkPoints> points;
points->InsertNextPoint(0, 0, 0);
points->InsertNextPoint(1, 0, 0);
points->InsertNextPoint(2, 0, 0);
vtkNew<vtkPolyData> input;
input->SetPoints(points);
vtkNew<vtkSphereSource> glyphSource;
glyphSource->SetRadius(0.1);
glyphSource->Update();
vtkNew<vtkGlyph3D> glyph3D;
glyph3D->GeneratePointIdsOn();
glyph3D->SetSourceConnection(glyphSource->GetOutputPort());
glyph3D->SetInputData(input);
glyph3D->SetScaleModeToDataScalingOff();
glyph3D->Update();
// Create a mapper and actor
vtkNew<vtkPolyDataMapper> mapper;
mapper->SetInputConnection(glyph3D->GetOutputPort());
vtkNew<vtkActor> actor;
actor->SetMapper(mapper);
actor->GetProperty()->SetColor(color->GetColor3d("Tomato").GetData());
// Visualize
vtkNew<vtkRenderer> renderer;
vtkNew<vtkRenderWindow> renderWindow;
renderWindow->AddRenderer(renderer);
renderWindow->SetWindowName("MoveAGlyph");
vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
renderWindowInteractor->SetRenderWindow(renderWindow);
renderer->AddActor(actor);
renderer->SetBackground(color->GetColor3d("Burlywood").GetData());
renderWindow->Render();
vtkNew<InteractorStyleMoveGlyph> style;
renderWindowInteractor->SetInteractorStyle(style);
style->Data = input;
style->GlyphData = glyph3D->GetOutput();
renderer->GetActiveCamera()->Zoom(0.9);
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR)
project(MoveAGlyph)
find_package(VTK COMPONENTS
vtkCommonColor
vtkCommonCore
vtkCommonDataModel
vtkFiltersCore
vtkFiltersExtraction
vtkFiltersGeneral
vtkFiltersGeometry
vtkFiltersSources
vtkInteractionStyle
vtkRenderingContextOpenGL2
vtkRenderingCore
vtkRenderingFreeType
vtkRenderingGL2PSOpenGL2
vtkRenderingOpenGL2
QUIET
)
if (NOT VTK_FOUND)
message("Skipping MoveAGlyph: ${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(MoveAGlyph MACOSX_BUNDLE MoveAGlyph.cxx )
target_link_libraries(MoveAGlyph PRIVATE ${VTK_LIBRARIES})
else ()
# include all components
add_executable(MoveAGlyph MACOSX_BUNDLE MoveAGlyph.cxx )
target_link_libraries(MoveAGlyph PRIVATE ${VTK_LIBRARIES})
# vtk_module_autoinit is needed
vtk_module_autoinit(
TARGETS MoveAGlyph
MODULES ${VTK_LIBRARIES}
)
endif ()
Download and Build MoveAGlyph¶
Click here to download MoveAGlyph and its CMakeLists.txt file. Once the tarball MoveAGlyph.tar has been downloaded and extracted,
cd MoveAGlyph/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:
./MoveAGlyph
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.