geometry/curves/exampleGridCurve3d-2.cpp

This example shows how to use GridCurve as a sequence of 2-scells in a 3d Khalimsky space.

$ ./examples/geometry/curves/exampleGridCurve3d-2

Note that the data type you want to display may be passed as argument as follows:

$ ./examples/geometry/curves/exampleGridCurve3d-2 gridcurve

This command line produces the following output:

Slice of a digital surface

See also

Analysis of one-dimensional discrete structures

#include <iostream>
#include "DGtal/base/Common.h"
 
#include "DGtal/helpers/StdDefs.h"
#include "DGtal/topology/KhalimskySpaceND.h"
#include "DGtal/topology/SurfelAdjacency.h"
#include "DGtal/topology/DigitalSurface.h"
#include "DGtal/topology/SetOfSurfels.h"
#include "DGtal/topology/DigitalSurface2DSlice.h"
#include "DGtal/topology/helpers/Surfaces.h"
 
#include "DGtal/io/viewers/PolyscopeViewer.h"
#include "DGtal/io/readers/VolReader.h"
#include "DGtal/images/ImageSelector.h"
#include "DGtal/images/ImageHelper.h"
#include "DGtal/kernel/sets/DigitalSetInserter.h"
#include "DGtal/io/Color.h"
 
#include "DGtal/geometry/curves/GridCurve.h"
 
#include "ConfigExamples.h"
 
 

using namespace std;
using namespace DGtal;
using namespace Z3i;
 
int main( int argc, char** argv )
{
  trace.info() << "exampleGridCurve3d-2: the type of data to be displayed "
               << "may be given as argument as follows: "
               << argv[0] << " inner" << endl; 
  trace.info() << "Available types are: gridcurve (default), inner, outer, incident" << endl;
 
  string type = (argc > 1) ? string(argv[1]) : "gridcurve";
  trace.info() << "Chosen type: " << type << endl; 
 
  //vol reading and digital set construction
  trace.beginBlock( "Reading vol file into an image." );
  typedef ImageSelector < Domain, int>::Type Image;
  std::string inputFilename = examplesPath + "samples/cat10.vol";
  Image image = VolReader<Image>::importVol(inputFilename);
  DigitalSet set3d (image.domain());
  setFromImage( image, DigitalSetInserter<DigitalSet>(set3d), 1);
  trace.info() << set3d.size() << " voxels." << std::endl;
  trace.endBlock();
 
  //Khalimsky space construction
  trace.beginBlock( "Construct the Khalimsky space from the image domain." );
  KSpace ks;
  trace.endBlock();
 
  //digital surface construction
  typedef SurfelAdjacency<KSpace::dimension> MySurfelAdjacency;
  MySurfelAdjacency surfAdj( true ); // interior in all directions.
 
  trace.beginBlock( "Extracting boundary by scanning the space. " );
  typedef KSpace::Surfel Surfel;
  typedef KSpace::SurfelSet SurfelSet;
  typedef SetOfSurfels< KSpace, SurfelSet > MySetOfSurfels;
  typedef DigitalSurface< MySetOfSurfels > MyDigitalSurface;
  MySetOfSurfels theSetOfSurfels( ks, surfAdj );
  Surfaces<KSpace>::sMakeBoundary( theSetOfSurfels.surfelSet(),
                                   ks, set3d,
                                   image.domain().lowerBound(),
                                   image.domain().upperBound() );
  MyDigitalSurface digSurf( theSetOfSurfels );
  trace.info() << digSurf.size() << " surfels." << std::endl;
  trace.endBlock();
 
  //slice retrieving
  trace.beginBlock( "Extracting slice and constructing a grid curve. " );
  typedef MyDigitalSurface::DigitalSurfaceTracker MyTracker;
  typedef DigitalSurface2DSlice< MyTracker > My2DSlice;
 
  //Extract an initial boundary cell
  Surfel surf = *digSurf.begin();
  MyTracker* tracker = digSurf.container().newTracker( surf );
 
  // Extract the bondary contour associated to the initial surfel in
  // its first direction
  My2DSlice slice( tracker, *(ks.sDirs( surf )) );
  delete tracker;

  GridCurve<KSpace> gc(ks);
  gc.initFromSCellsRange( slice.begin(), slice.end() );
 
  trace.endBlock();
 
 
  // for 3D display with PolyscopeViewer
  trace.beginBlock( "Display all with Viewer." );
  PolyscopeViewer<Space, KSpace> viewer(ks);
  // Displaying all the surfels in transparent mode
  viewer.allowReuseList = true;
  for( MyDigitalSurface::ConstIterator it = theSetOfSurfels.begin(),
         it_end = theSetOfSurfels.end(); it != it_end; ++it )
    viewer<< *it;
 
  // Displaying slice
  viewer << Color( 50, 50, 255 );
 
  if (type == "gridcurve")
    {
      viewer  << gc;
    }
  else if (type == "inner")
    {
      viewer << gc.getInnerPointsRange();
    }
  else if (type == "outer")
    {
      viewer << gc.getOuterPointsRange();
    }
  else if (type == "incident")
    {
      viewer << gc.getIncidentPointsRange();
    }
  else
    {
      trace.info() << "Display type not known." << std::endl;
    }
 
  trace.endBlock();
 
  viewer.show();
  return 0;
}
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