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#include <vtkSphereSource.h>
#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkSliderWidget.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkCommand.h>
#include <vtkWidgetEvent.h>
#include <vtkCallbackCommand.h>
#include <vtkWidgetEventTranslator.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkSliderRepresentation2D.h>
#include <vtkProperty.h>
// The callback does the work.
// The callback keeps a pointer to the sphere whose resolution is
// controlled. After constructing the callback, the program sets the
// SphereSource of the callback to
// the object to be controlled.
class vtkSliderCallback : public vtkCommand
{
public:
static vtkSliderCallback *New()
{
return new vtkSliderCallback;
}
void Execute(vtkObject *caller, unsigned long, void*) VTK_OVERRIDE
{
vtkSliderWidget *sliderWidget =
reinterpret_cast<vtkSliderWidget*>(caller);
int value = static_cast<int>(static_cast<vtkSliderRepresentation *>(sliderWidget->GetRepresentation())->GetValue());
this->SphereSource->SetPhiResolution(value/2);
this->SphereSource->SetThetaResolution(value);
}
vtkSliderCallback():SphereSource(0) {}
vtkSphereSource *SphereSource;
};
int main (int, char *[])
{
// A sphere
vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New();
sphereSource->SetCenter(0.0, 0.0, 0.0);
sphereSource->SetRadius(4.0);
sphereSource->SetPhiResolution(4);
sphereSource->SetThetaResolution(8);
vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
mapper->SetInputConnection(sphereSource->GetOutputPort());
vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
actor->SetMapper(mapper);
actor->GetProperty()->SetInterpolationToFlat();
// A renderer and render window
vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
// An interactor
vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
renderWindowInteractor->SetRenderWindow(renderWindow);
// Add the actors to the scene
renderer->AddActor(actor);
// Render an image (lights and cameras are created automatically)
renderWindow->Render();
// Here we describe the representation of the widget.
vtkSmartPointer<vtkSliderRepresentation2D> sliderRep = vtkSmartPointer<vtkSliderRepresentation2D>::New();
sliderRep->SetMinimumValue(3.0);
sliderRep->SetMaximumValue(20.0);
sliderRep->SetValue(sphereSource->GetThetaResolution());
sliderRep->SetTitleText("Sphere Resolution");
// Here we use normalized display coordinates (0,1) so that the
// slider will stay in the same proportionate location if the window
// is resized.
sliderRep->GetPoint1Coordinate()->SetCoordinateSystemToNormalizedDisplay();
sliderRep->GetPoint1Coordinate()->SetValue(.1 ,.1);
sliderRep->GetPoint2Coordinate()->SetCoordinateSystemToNormalizedDisplay();
sliderRep->GetPoint2Coordinate()->SetValue(.3, .1);
// Create the callback and pass it the sphereSource to be controlled
vtkSmartPointer<vtkSliderCallback> callback = vtkSmartPointer<vtkSliderCallback>::New();
callback->SphereSource = sphereSource;
// The widget is the controller for the interction.
vtkSmartPointer<vtkSliderWidget> sliderWidget = vtkSmartPointer<vtkSliderWidget>::New();
sliderWidget->SetInteractor(renderWindowInteractor);
sliderWidget->SetRepresentation(sliderRep);
sliderWidget->SetAnimationModeToAnimate();
sliderWidget->EnabledOn();
// Observe the interaction events of the widget. If the computation
// in the callback is time consuming, observe the
// EndInteractionEvent instead.
sliderWidget->AddObserver(vtkCommand::InteractionEvent,callback);
renderWindowInteractor->Initialize();
renderWindow->Render();
renderWindowInteractor->Start();
return EXIT_SUCCESS;
}
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