examplePointFunctorHolder.cpp

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// Inclusions

#include <algorithm>
 
#include "DGtal/base/Common.h"
#include "DGtal/helpers/StdDefs.h"
 
#include "DGtal/kernel/PointFunctorHolder.h"
#include "DGtal/geometry/volumes/distance/DistanceTransformation.h"
 
#include "DGtal/io/boards/Board2D.h"
#include "DGtal/io/colormaps/HueShadeColorMap.h"
 
#include <boost/algorithm/minmax_element.hpp>

using namespace DGtal;
 
int main()
{
  auto mickey = functors::holdPointFunctor<Z2i::Point>(
    [] ( Z2i::Point const& pt ) {
      return
           (pt - Z2i::Point(0, -5)).norm() > 3
        && (    pt.norm() <= 20
             || (pt - Z2i::Point(-18,21)).norm() <= 10
             || (pt - Z2i::Point( 18,21)).norm() <= 10
           );
    });

  Z2i::Domain domain( Z2i::Point(-35,-25), Z2i::Point(35, 35) );
 
  using DTL2 = DistanceTransformation<Z2i::Space, decltype(mickey), Z2i::L2Metric>;
 
  DTL2 dt( domain, mickey, Z2i::l2Metric );
 

  DTL2::Value maxDT = *boost::first_max_element( dt.constRange().begin(), dt.constRange().end() );
  using HueTwice = HueShadeColorMap<DTL2::Value, 1>;
 
  Board2D aBoard;
  aBoard << domain;
  Display2DFactory::drawImage<HueTwice>(aBoard, dt, 0, maxDT);
  aBoard.saveEPS("examplePointFunctorHolder.eps");
 
  return 0;
 
}