examplePreimage.cpp File Reference

An example file for Preimage2D. More...

#include <iostream>
#include "DGtal/base/Common.h"
#include "DGtal/helpers/StdDefs.h"
#include "ConfigExamples.h"
#include "DGtal/geometry/tools/Preimage2D.h"
#include "DGtal/shapes/fromPoints/StraightLineFrom2Points.h"
#include "DGtal/shapes/fromPoints/CircleFrom2Points.h"
#include "DGtal/io/boards/Board2D.h"

Include dependency graph for examplePreimage.cpp:

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

Detailed Description

An example file for Preimage2D.

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

Tristan Roussillon (trist.nosp@m.an.r.nosp@m.oussi.nosp@m.llon.nosp@m.@liri.nosp@m.s.cn.nosp@m.rs.fr ) Laboratoire d'InfoRmatique en Image et Systèmes d'information - LIRIS (CNRS, UMR 5205), CNRS, France

Date

2011/09/21

This file is part of the DGtal library.

Definition in file examplePreimage.cpp.

Function Documentation

main()

int main	(	int	argc,
		char **	argv )

[PreimageTypedefFromStraightLine]

[PreimageTypedefFromStraightLine]

[PreimageUsageFromIncidentPointsRange]

[PreimageUsageFromIncidentPointsRange]

[PreimageTypedefFromCircle]

[PreimageTypedefFromCircle]

Definition at line 59 of file examplePreimage.cpp.

{
  trace.beginBlock ( "Example for Preimage computation" );
  trace.info() << "Args:";
  for ( int i = 0; i < argc; ++i )
    trace.info() << " " << argv[ i ];
  trace.info() << endl;
  
  std::string filename = examplesPath + "samples/DSS.dat";
  ifstream instream; // input stream
  instream.open (filename.c_str(), ifstream::in);
  
  Curve c; //grid curve
  c.initFromVectorStream(instream);
 
{
  trace.beginBlock("Simple preimage example");
 
  typedef StraightLineFrom2Points<Curve::Point> StraightLine;
  StraightLine aStraightLine; //instance of straight line
  typedef Preimage2D<StraightLine> Preimage2D;
 
 
  Curve::IncidentPointsRange r = c.getIncidentPointsRange(); //range
  Curve::IncidentPointsRange::ConstIterator it (r.begin()); //iterators
  Curve::IncidentPointsRange::ConstIterator itEnd (r.end()); 
 
  //preimage computation
  Preimage2D thePreimage(it->first, it->second, aStraightLine);
  ++it; 
  while ( (it != itEnd) &&
              (thePreimage.addFront(it->first, it->second)) )
  {
    ++it;
  }
  trace.info() << thePreimage << endl;
  //display
  Board2D board;
  board.setUnit(Board2D::UCentimeter);
  board << r << thePreimage; 
  board.saveEPS( "PreimageExample.eps" );
  
  trace.endBlock();
}
 
{
  trace.beginBlock("Preimage example with circles");
  Curve::Point pole(7,2); 
 
  typedef CircleFrom2Points<Curve::Point> Circle;
  Circle aCircle( pole ); //instance of circle passing through point 'pole' 
  typedef Preimage2D<Circle> Preimage2D;
 
  Curve::IncidentPointsRange r = c.getIncidentPointsRange(); //range
  Curve::IncidentPointsRange::ConstIterator it (r.begin()); //iterators
  Curve::IncidentPointsRange::ConstIterator itEnd (r.end()); 
 
  //preimage computation
  Preimage2D thePreimage(it->first, it->second, aCircle);
  ++it; 
  while ( (it != itEnd) &&
              (thePreimage.addFront(it->first, it->second)) )
  {
    ++it;
  }
  trace.info() << thePreimage << endl;
  //display
  Board2D board;
  board.setUnit(Board2D::UCentimeter);
  board << r << SetMode(pole.className(),"Grid") << pole << thePreimage; 
  board.saveEPS( "PreimageExample2.eps" );
  board.saveSVG( "PreimageExample2.svg" );  
#ifdef WITH_CAIRO
    board.saveCairo("PreimageExample2.pdf", Board2D::CairoPDF);
#endif
 
  trace.endBlock();
}
 
  return 0;
}

References DGtal::Preimage2D< Shape >::addFront(), DGtal::Trace::beginBlock(), DGtal::PointVector< dim, TEuclideanRing, TContainer >::className(), DGtal::Trace::endBlock(), DGtal::Trace::info(), DGtal::GridCurve< TKSpace >::initFromVectorStream(), LibBoard::Board::saveCairo(), LibBoard::Board::saveEPS(), LibBoard::Board::saveSVG(), LibBoard::Board::setUnit(), and DGtal::trace.