Difference between revisions of "VTK/Examples/Cxx/PolyData/DecimatePolyline"

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(Decimate one Polyline: add link, remove outdated note)
(Replaced content with "= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/DecimatePolyline DecimatePolyline] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples...")
 
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<div class="floatright">[[File:VTK_Examples_Baseline_Widgets_DecimatePolyline.png|300px]]</div>
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= '''See [https://lorensen.github.io/VTKExamples/site/Cxx/PolyData/DecimatePolyline DecimatePolyline] on the new [https://lorensen.github.io/VTKExamples/site/ VTKExamples website].''' =
== Decimate one Polyline ==
 
This example shows how to [[wikipedia:Decimation (signal processing)|decimate]] a polyline.
 
 
 
==DecimatePolyline.cxx==
 
<source lang="cpp">
 
#include <vtkVersion.h>
 
#include <vtkDecimatePolylineFilter.h>
 
#include <vtkMath.h>
 
#include <vtkPolyData.h>
 
#include <vtkCellArray.h>
 
#include <vtkPolyDataMapper.h>
 
#include <vtkActor.h>
 
#include <vtkRenderer.h>
 
#include <vtkRenderWindow.h>
 
#include <vtkRenderWindowInteractor.h>
 
#include <vtkProperty.h>
 
 
 
#include <vtkSmartPointer.h>
 
 
 
int main(int, char *[])
 
{
 
  const unsigned int numberofpoints = 100;
 
 
 
  vtkPolyData* circle = vtkPolyData::New();
 
  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
 
  vtkSmartPointer<vtkCellArray> lines = vtkSmartPointer<vtkCellArray>::New();
 
  vtkIdType* lineIndices = new vtkIdType[numberofpoints+1];
 
 
 
  for( unsigned int i = 0; i < numberofpoints; i++ )
 
    {
 
    const double angle = 2.0 * vtkMath::Pi() * static_cast< double >( i ) /
 
      static_cast< double >( numberofpoints );
 
    points->InsertPoint( static_cast< vtkIdType >( i ),
 
                        cos( angle ),
 
                        sin( angle ),
 
                        0. );
 
    lineIndices[i] = static_cast< vtkIdType >( i );
 
    }
 
  lineIndices[numberofpoints] = 0;
 
  lines->InsertNextCell( numberofpoints+1, lineIndices );
 
  delete[] lineIndices;
 
 
 
  circle->SetPoints( points );
 
  circle->SetLines( lines );
 
 
 
  vtkSmartPointer<vtkPolyDataMapper> c_mapper =
 
    vtkSmartPointer<vtkPolyDataMapper>::New();
 
#if VTK_MAJOR_VERSION <= 5
 
  c_mapper->SetInput( circle );
 
#else
 
  c_mapper->SetInputData( circle );
 
#endif
 
 
 
  vtkSmartPointer<vtkActor> c_actor =
 
    vtkSmartPointer<vtkActor>::New();
 
  c_actor->SetMapper( c_mapper );
 
 
 
  vtkSmartPointer<vtkDecimatePolylineFilter> decimate =
 
    vtkSmartPointer<vtkDecimatePolylineFilter>::New();
 
#if VTK_MAJOR_VERSION <= 5
 
  decimate->SetInput( circle );
 
#else
 
  decimate->SetInputData( circle );
 
#endif
 
  decimate->SetTargetReduction( 0.95 );
 
  decimate->Update();
 
 
 
  vtkSmartPointer<vtkPolyDataMapper> d_mapper =
 
    vtkSmartPointer<vtkPolyDataMapper>::New();
 
  d_mapper->SetInputConnection( decimate->GetOutputPort() );
 
 
 
  vtkSmartPointer<vtkActor> d_actor =
 
    vtkSmartPointer<vtkActor>::New();
 
  d_actor->SetMapper( d_mapper );
 
  d_actor->GetProperty()->SetColor( 1., 0. ,0. );
 
 
 
  vtkSmartPointer<vtkRenderer> ren =
 
    vtkSmartPointer<vtkRenderer>::New();
 
  ren->AddActor( c_actor );
 
  ren->AddActor( d_actor );
 
 
 
  vtkSmartPointer<vtkRenderWindow> renwin =
 
    vtkSmartPointer<vtkRenderWindow>::New();
 
  renwin->AddRenderer( ren );
 
 
 
  vtkSmartPointer<vtkRenderWindowInteractor> iren =  
 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
 
  iren->SetRenderWindow( renwin );
 
 
 
  renwin->Render();
 
 
 
  iren->Start();
 
 
 
  circle->Delete();
 
 
 
  return EXIT_SUCCESS;
 
}
 
</source>
 
 
 
{{VTKCMakeLists|{{SUBPAGENAME}}}}
 

Latest revision as of 17:12, 9 September 2019

See DecimatePolyline on the new VTKExamples website.