Hi,
The following code highlights a picked point tentatively, although I
don't know if this is really a formal and correct way of using vtk.
-------
#include <vtkSmartPointer.h>
#include <vtkRendererCollection.h>
#include <vtkPointPicker.h>
#include <vtkSphereSource.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkVertexGlyphFilter.h>
#include <vtkProperty.h>
#include <vtkActor.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkObjectFactory.h>
// Define interaction style
class MouseInteractorStylePP : public vtkInteractorStyleTrackballCamera
{
public:
static MouseInteractorStylePP* New();
vtkTypeMacro(MouseInteractorStylePP, vtkInteractorStyleTrackballCamera);
MouseInteractorStylePP()
{
this->PointPicker = vtkSmartPointer<vtkPointPicker>::New();
// Setup ghost glyph
vtkSmartPointer<vtkPoints> points =
vtkSmartPointer<vtkPoints>::New();
points->InsertNextPoint(0,0,0);
this->SelectedPolyData = vtkSmartPointer<vtkPolyData>::New();
this->SelectedPolyData->SetPoints(points);
this->SelectedGlyphFilter = vtkSmartPointer<vtkVertexGlyphFilter>::New();
#if VTK_MAJOR_VERSION <= 5
this->SelectedGlyphFilter->SetInputConnection(
this->SelectedPolyData->GetProducerPort());
#else
this->SelectedGlyphFilter->SetInputData(this->SelectedPolyData);
#endif
this->SelectedGlyphFilter->Update();
this->SelectedMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
this->SelectedMapper->SetInputConnection(this->SelectedGlyphFilter->GetOutputPort());
this->SelectedActor = vtkSmartPointer<vtkActor>::New();
this->SelectedActor->SetMapper(SelectedMapper);
this->SelectedActor->VisibilityOff();
this->SelectedActor->GetProperty()->SetPointSize(10);
this->SelectedActor->GetProperty()->SetColor(1,0,0);
}
virtual void OnLeftButtonDown()
{
// Forward events
vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
// Get the selected point
int x = this->Interactor->GetEventPosition()[0];
int y = this->Interactor->GetEventPosition()[1];
this->FindPokedRenderer(x, y);
std::cout << "Picking pixel: " <<
this->Interactor->GetEventPosition()[0] << " " <<
this->Interactor->GetEventPosition()[1] << std::endl;
this->PointPicker->Pick(this->Interactor->GetEventPosition()[0],
this->Interactor->GetEventPosition()[1],
0, // always zero.
this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
if (this->PointPicker->GetPointId() >= 0)
{
this->SelectedActor->VisibilityOn();
this->HighlightProp(NULL);
this->SelectedPoint = this->PointPicker->GetPointId();
double p[3];
this->Points->GetPoint(this->SelectedPoint, p);
this->SelectedActor->SetPosition(p);
this->GetCurrentRenderer()->AddActor(this->SelectedActor);
}
}
void SetPoints(vtkSmartPointer<vtkPolyData> points) {this->Points = points;}
private:
vtkSmartPointer<vtkPolyData> Points;
vtkSmartPointer<vtkPointPicker> PointPicker;
vtkSmartPointer<vtkActor> SelectedActor;
vtkSmartPointer<vtkPolyDataMapper> SelectedMapper;
vtkSmartPointer<vtkPolyData> SelectedPolyData;
vtkSmartPointer<vtkVertexGlyphFilter> SelectedGlyphFilter;
vtkIdType SelectedPoint;
};
vtkStandardNewMacro(MouseInteractorStylePP);
int main(int, char *[])
{
vtkSmartPointer<vtkSphereSource> sphereSource =
vtkSmartPointer<vtkSphereSource>::New();
sphereSource->Update();
vtkSmartPointer<vtkPointPicker> pointPicker =
vtkSmartPointer<vtkPointPicker>::New();
vtkSmartPointer<vtkPolyData> points =
vtkSmartPointer<vtkPolyData>::New();
points->SetPoints(sphereSource->GetOutput()->GetPoints());
// Create a mapper and actor
vtkSmartPointer<vtkPolyDataMapper> mapper =
vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor =
vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->EdgeVisibilityOn();
// Create a renderer, render window, and interactor
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetPicker(pointPicker);
renderWindowInteractor->SetRenderWindow(renderWindow);
vtkSmartPointer<MouseInteractorStylePP> style =
vtkSmartPointer<MouseInteractorStylePP>::New();
style->SetPoints(points);
renderWindowInteractor->SetInteractorStyle( style );
// Add the actor to the scene
renderer->AddActor(actor);
renderer->SetBackground(1,1,1); // Background color white
// Render and interact
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
-----
Hope that helps
Post by meakceyHi
How can i extend Point Pick example to highlighted point pick. Something
https://lorensen.github.io/VTKExamples/site/Cxx/Interaction/PointPicker/
https://lorensen.github.io/VTKExamples/site/Cxx/Picking/HighlightSelectedPoints/
Is there any direct way to reach point ids and properties and also setting
properties by point picker?
Thanks
--
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