exampleConstImageFunctorHolder.cpp File Reference

An example file for DGtal::functors::ConstImageFunctorHolder. More...

#include "DGtal/base/Common.h"
#include "DGtal/helpers/StdDefs.h"
#include "DGtal/io/boards/Board2D.h"
#include <cmath>
#include <DGtal/io/colormaps/HueShadeColorMap.h>
#include "DGtal/images/ConstImageFunctorHolder.h"

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Functions
int	main ()
	[include] More...

Detailed Description

An example file for DGtal::functors::ConstImageFunctorHolder.

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

Roland Denis (denis.nosp@m.@mat.nosp@m.h.uni.nosp@m.v-ly.nosp@m.on1.f.nosp@m.r ) CNRS, Institut Camille Jordan (UMR 5208), Université Lyon 1, France

Date

2018/07/18

This file is part of the DGtal library.

Definition in file exampleConstImageFunctorHolder.cpp.

Function Documentation

main()

int main

(

void

)

[include]

[include]

[def]

[def]

[example1]

[example1]

[example2]

[example2]

[example3]

[example3]

Definition at line 44 of file exampleConstImageFunctorHolder.cpp.

{
  using namespace DGtal::Z2i;
 
  DGtal::Board2D aBoard;
 
  using Value = double; // value type  of the image
  using HueShadeDouble = DGtal::HueShadeColorMap<Value>;  // a simple HueShadeColorMap varying on 'double' values
 
  // Image from a unary lambda
  const Domain domain1(Point(1,1), Point(16,16));
 
  auto image1 = DGtal::functors::holdConstImageFunctor(
      domain1,
      [] (Point const& pt) { return 25 * ( std::cos( (pt - Point(4,4)).norm() ) + 1 ); }
  );
 
  aBoard.clear();
  DGtal::Display2DFactory::drawImage<HueShadeDouble>(aBoard, image1, 0, 225);
  aBoard.saveSVG("ConstImageFunctorHolder_example1.svg");
 
  // Image from a binary lambda
  const Domain domain2(Point(-1,1), Point(18,18));
 
  auto image2 = DGtal::functors::holdConstImageFunctor(
      domain2,
      [] (Point const& pt, Domain const& d) { // we could also capture the domain
        return 2 * std::min( ( pt - d.lowerBound() ).norm(), ( pt - d.upperBound() ).norm() );
      }
  );
  
  aBoard.clear();
  DGtal::Display2DFactory::drawImage<HueShadeDouble>(aBoard, image2, 0, 225);
  aBoard.saveSVG("ConstImageFunctorHolder_example2.svg");
 
  // Image that depends on other images
  auto image3 = DGtal::functors::holdConstImageFunctor(
      domain1,
      [&image1, &image2] (Point const& pt) { return image1(pt) + image2(pt); }
  );
  
  aBoard.clear();
  DGtal::Display2DFactory::drawImage<HueShadeDouble>(aBoard, image3, 0, 225);
  aBoard.saveSVG("ConstImageFunctorHolder_example3.svg");
  return 0;
}

References LibBoard::Board::clear(), DGtal::functors::holdConstImageFunctor(), DGtal::HyperRectDomain< TSpace >::lowerBound(), LibBoard::Board::saveSVG(), and DGtal::HyperRectDomain< TSpace >::upperBound().