exampleDigitalConvexity.cpp File Reference

An example file for DigitalConvexity in 2D. More...

#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/helpers/StdDefs.h"
#include "ConfigExamples.h"
#include "DGtal/geometry/curves/FreemanChain.h"
#include "DGtal/geometry/curves/GridCurve.h"
#include "DGtal/geometry/volumes/DigitalConvexity.h"
#include "DGtal/io/boards/Board2D.h"

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Functions
int	main (int argc, char **argv)

Detailed Description

An example file for DigitalConvexity in 2D.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Author

Jacques-Olivier Lachaud (jacqu.nosp@m.es-o.nosp@m.livie.nosp@m.r.la.nosp@m.chaud.nosp@m.@uni.nosp@m.v-sav.nosp@m.oie..nosp@m.fr ) Laboratory of Mathematics (CNRS, UMR 5127), University of Savoie, France

Date

2020/02/02

This file is part of the DGtal library.

Definition in file exampleDigitalConvexity.cpp.

Function Documentation

main()

int main	(	int	argc,
		char **	argv )

Definition at line 64 of file exampleDigitalConvexity.cpp.

{
  trace.beginBlock ( "Example for 2d gridcurves" );
  string S = examplesPath + "samples/contourS.fc";
 
  // domain
  const Point lowerBound( -200, -200 );
  const Point upperBound( 200, 200 );
 
  fstream inputStream( S.c_str(), ios::in );
  FreemanChain<int> fc(inputStream);
  inputStream.close();
  Curve c;
  c.initFromPointsRange( fc.begin(), fc.end() );
  auto points = c.getPointsRange();
  std::vector<Point> T( points.begin(), points.end() );
  Board2D aBoard;
  aBoard.setUnit(Board2D::UCentimeter);
  DigitalConvexity<KSpace> dconv( lowerBound, upperBound );
  auto c_cover = dconv.makeCellCover( T.begin(), T.end(), 1, 1 );
  const float sx = -0.5;
  const float sy = -0.5;
  trace.beginBlock( "Compute fully subconvex sets" );
  for ( size_t i = 0; i < T.size(); ++i )
    for ( size_t j = i+2; j < T.size(); ++j )
      {
        aBoard.setPenColorRGBi( rand() % 255, rand() % 255, rand() % 255 );
        size_t k = (i+j)/2;
        if ( ! dconv.isSimplexFullDimensional( { T[i], T[j], T[k] } ) ) continue;
        auto triangle = dconv.makeSimplex( { T[i], T[j], T[k] } );
        if ( dconv.isFullySubconvex( triangle, c_cover ) )
          {
            aBoard.drawLine( sx+(float)T[i][0], sy+(float)T[i][1],
                             sx+(float)T[j][0], sy+(float)T[j][1] );
            aBoard.drawLine( sx+(float)T[i][0], sy+(float)T[i][1],
                             sx+(float)T[k][0], sy+(float)T[k][1] );
            aBoard.drawLine( sx+(float)T[k][0], sy+(float)T[k][1],
                             sx+(float)T[j][0], sy+(float)T[j][1] );
          }
        else
          j = T.size();
      }
  trace.endBlock();
  aBoard.setPenColor( Color::Black );
  aBoard << c;
  aBoard.saveEPS( "myGridCurve.eps", Board2D::BoundingBox );//, 5000 );
  trace.endBlock();
  return 0;
}

References DGtal::FreemanChain< TInteger >::begin(), DGtal::Trace::beginBlock(), DGtal::Color::Black, LibBoard::Board::drawLine(), DGtal::FreemanChain< TInteger >::end(), DGtal::Trace::endBlock(), DGtal::GridCurve< TKSpace >::initFromPointsRange(), DGtal::DigitalConvexity< TKSpace >::isFullySubconvex(), DGtal::DigitalConvexity< TKSpace >::isSimplexFullDimensional(), DGtal::DigitalConvexity< TKSpace >::makeCellCover(), DGtal::DigitalConvexity< TKSpace >::makeSimplex(), LibBoard::Board::saveEPS(), LibBoard::Board::setPenColor(), LibBoard::Board::setPenColorRGBi(), LibBoard::Board::setUnit(), and DGtal::trace.