DGtal 1.3.0
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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/Viewer3D.h"
#include "DGtal/io/readers/VolReader.h"
#include "DGtal/io/DrawWithDisplay3DModifier.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;
//Khalimsky space construction
trace.beginBlock( "Construct the Khalimsky space from the image domain." );
KSpace ks;
//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;
MySetOfSurfels theSetOfSurfels( ks, surfAdj );
Surfaces<KSpace>::sMakeBoundary( theSetOfSurfels.surfelSet(),
ks, set3d,
image.domain().upperBound() );
MyDigitalSurface digSurf( theSetOfSurfels );
trace.info() << digSurf.size() << " surfels." << std::endl;
//slice retrieving
trace.beginBlock( "Extracting slice and constructing a grid curve. " );
typedef MyDigitalSurface::DigitalSurfaceTracker MyTracker;
//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;
gc.initFromSCellsRange( slice.begin(), slice.end() );
// for 3D display with Viewer3D
QApplication application(argc,argv);
trace.beginBlock( "Display all with QGLViewer." );
// Displaying all the surfels in transparent mode
viewer << SetMode3D( surf.className(), "Transparent");
for( MyDigitalSurface::ConstIterator it = theSetOfSurfels.begin(),
it_end = theSetOfSurfels.end(); it != it_end; ++it )
viewer<< *it;
// Displaying slice
viewer << Viewer3D<Space, KSpace>::shiftSurfelVisu;
viewer << SetMode3D( surf.className(), "");
viewer.setFillColor( 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();
trace.info() << "Display type not known." << std::endl;
viewer << Viewer3D<Space, KSpace>::updateDisplay;
return application.exec();
// //
Structure representing an RGB triple with alpha component.
Definition: Color.h:68
Aim: this output iterator class is designed to allow algorithms to insert points in the digital set....
Aim: Represents a 2-dimensional slice in a DigitalSurface. In a sense, it is a 4-connected contour,...
ConstIterator begin() const
Aim: Represents a set of n-1-cells in a nD space, together with adjacency relation between these cell...
virtual void setFillColor(DGtal::Color aColor)
Aim: describes, in a cellular space of dimension n, a closed or open sequence of signed d-cells (or d...
Definition: GridCurve.h:173
IncidentPointsRange getIncidentPointsRange() const
Definition: GridCurve.h:486
OuterPointsRange getOuterPointsRange() const
Definition: GridCurve.h:474
InnerPointsRange getInnerPointsRange() const
Definition: GridCurve.h:462
bool initFromSCellsRange(const TIterator &itb, const TIterator &ite)
Aim: A model of CDigitalSurfaceContainer which defines the digital surface as connected surfels....
Definition: SetOfSurfels.h:74
Aim: A utility class for constructing surfaces (i.e. set of (n-1)-cells).
Definition: Surfaces.h:79
Aim: Represent adjacencies between surfel elements, telling if it follows an interior to exterior ord...
void beginBlock(const std::string &keyword="")
std::ostream & info()
double endBlock()
virtual void show()
Overload QWidget method in order to add a call to updateList() method (to ensure that the lists are w...
DigitalSurface< MyDigitalSurfaceContainer > MyDigitalSurface
MyDigitalSurface::SurfelSet SurfelSet
DGtal is the top-level namespace which contains all DGtal functions and types.
STL namespace.
Modifier class in a Display3D stream. Useful to choose your own mode for a given class....
Aim: implements methods to read a "Vol" file format.
Definition: VolReader.h:90
int main()
Definition: testBits.cpp:56
ImageContainerBySTLVector< Domain, Value > Image
Z2i::DigitalSet DigitalSet