examplePreimage.cpp

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#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"

 
using namespace std;
using namespace DGtal;
using namespace Z2i; 
 

int main( int argc, char** argv )
{
  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 DGTAL_WITH_CAIRO
    board.saveCairo("PreimageExample2.pdf", Board2D::CairoPDF);
#endif
 
  trace.endBlock();
}
 
  return 0;
}
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