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106 lines
3.1 KiB
106 lines
3.1 KiB
2 years ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: Cone2.cxx,v $
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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//
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// This example shows how to add an observer to a C++ program. It extends
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// the Step1/Cxx/Cone.cxx C++ example (see that example for information on
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// the basic setup).
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//
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// VTK uses a command/observer design pattern. That is, observers watch for
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// particular events that any vtkObject (or subclass) may invoke on
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// itself. For example, the vtkRenderer invokes a "StartEvent" as it begins
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// to render. Here we add an observer that invokes a command when this event
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// is observed.
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//
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// first include the required header files for the vtk classes we are using
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#include "vtkConeSource.h"
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#include "vtkPolyDataMapper.h"
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#include "vtkRenderWindow.h"
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#include "vtkCommand.h"
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#include "vtkCamera.h"
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#include "vtkActor.h"
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#include "vtkRenderer.h"
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// Callback for the interaction
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class vtkMyCallback : public vtkCommand
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{
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public:
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static vtkMyCallback *New()
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{ return new vtkMyCallback; }
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virtual void Execute(vtkObject *caller, unsigned long, void*)
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{
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vtkRenderer *renderer = reinterpret_cast<vtkRenderer*>(caller);
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cout << renderer->GetActiveCamera()->GetPosition()[0] << " "
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<< renderer->GetActiveCamera()->GetPosition()[1] << " "
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<< renderer->GetActiveCamera()->GetPosition()[2] << "\n";
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}
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};
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int main()
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{
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//
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// The pipeline creation is documented in Step1
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//
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vtkConeSource *cone = vtkConeSource::New();
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cone->SetHeight( 3.0 );
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cone->SetRadius( 1.0 );
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cone->SetResolution( 10 );
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vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
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coneMapper->SetInputConnection( cone->GetOutputPort() );
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vtkActor *coneActor = vtkActor::New();
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coneActor->SetMapper( coneMapper );
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vtkRenderer *ren1= vtkRenderer::New();
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ren1->AddActor( coneActor );
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ren1->SetBackground( 0.1, 0.2, 0.4 );
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ren1->ResetCamera();
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vtkRenderWindow *renWin = vtkRenderWindow::New();
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renWin->AddRenderer( ren1 );
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renWin->SetSize( 300, 300 );
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// Here is where we setup the observer, we do a new and ren1 will
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// eventually free the observer
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vtkMyCallback *mo1 = vtkMyCallback::New();
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ren1->AddObserver(vtkCommand::StartEvent,mo1);
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mo1->Delete();
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//
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// now we loop over 360 degrees and render the cone each time
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//
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int i;
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for (i = 0; i < 360; ++i)
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{
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// render the image
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renWin->Render();
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// rotate the active camera by one degree
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ren1->GetActiveCamera()->Azimuth( 1 );
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}
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//
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// Free up any objects we created
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//
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cone->Delete();
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coneMapper->Delete();
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coneActor->Delete();
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ren1->Delete();
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renWin->Delete();
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return 0;
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}
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