DGtal  1.2.0
exampleRationalConvexity.cpp
1
44 #include <iostream>
45
46 #include "DGtal/base/Common.h"
47 #include "DGtal/helpers/StdDefs.h"
48 #include "ConfigExamples.h"
49
50 #include "DGtal/topology/KhalimskySpaceND.h"
51 #include "DGtal/geometry/curves/FreemanChain.h"
52 #include "DGtal/geometry/curves/GridCurve.h"
53 #include "DGtal/geometry/volumes/DigitalConvexity.h"
54
55 #include "DGtal/io/boards/Board2D.h"
56
58
59 using namespace std;
60 using namespace DGtal;
61 using namespace Z2i;
62
63
65 int main( int argc, char** argv )
66 {
67  trace.beginBlock ( "Example for 2d gridcurves" );
68  string S = examplesPath + "samples/contourS.fc";
69
70  // domain
71  const Point lowerBound( -200, -200 );
72  const Point upperBound( 200, 200 );
73  DigitalConvexity<KSpace> dconv( lowerBound, upperBound );
74
75  fstream inputStream( S.c_str(), ios::in );
76  FreemanChain<int> fc(inputStream);
77  inputStream.close();
78  Curve c;
79  c.initFromPointsRange( fc.begin(), fc.end() );
80  auto points = c.getPointsRange();
81  std::vector<Point> T( points.begin(), points.end() );
82  auto midpoints = c.getMidPointsRange();
83  std::vector<RealPoint> RT( midpoints.begin(), midpoints.end() );
84  std::vector<Point> T2;
85  for ( auto && rp : midpoints )
86  // there is a shift of (0.5,0.5) between points and cells embedder.
87  T2.push_back( Point( (int) round( 2. * rp[ 0 ] + 1. ),
88  (int) round( 2. * rp[ 1 ] + 1. ) ) );
89  Board2D aBoard;
90  aBoard.setUnit(Board2D::UCentimeter);
91  // Display cells
92  const KSpace& K = dconv.space();
93  Color grey( 200, 200, 200 );
94  std::set<Cell> pixels;
95  for ( auto p : T )
96  {
97  pixels.insert( K.uCell( Point( 2*p[ 0 ] - 1, 2*p[ 1 ] - 1 ) ) );
98  pixels.insert( K.uCell( Point( 2*p[ 0 ] + 1, 2*p[ 1 ] - 1 ) ) );
99  pixels.insert( K.uCell( Point( 2*p[ 0 ] - 1, 2*p[ 1 ] + 1 ) ) );
100  pixels.insert( K.uCell( Point( 2*p[ 0 ] + 1, 2*p[ 1 ] + 1 ) ) );
101  }
102  for ( auto && pixel : pixels )
103  aBoard << CustomStyle( pixel.className(), new CustomColors( grey, grey ) )
104  << pixel;
105  // Display contour
106  aBoard.setPenColor( Color::Black );
107  aBoard << c;
108  // Compute subconvex rational segments.
109  auto c_cover = dconv.makeCellCover( T.begin(), T.end(), 1, 1 );
110  trace.beginBlock( "Compute fully subconvex rational sets" );
111  Point denominator( 2, 2 );
112  unsigned int last_j = 0;
113  unsigned int j = 0;
114  for ( unsigned int i = 0; i < T2.size(); ++i )
115  {
116  aBoard.setPenColorRGBi( rand() % 255, rand() % 255, rand() % 255 );
117  unsigned int start_j = ( i + 1 ) % T2.size();
118  for ( j = ( start_j + 1 ) % T2.size(); j != start_j; j = ( j + 1 ) % T2.size() )
119  {
120  auto segment = dconv.makeRationalSimplex( { denominator, T2[i], T2[j] } );
121  if ( ! dconv.isFullySubconvex( segment, c_cover ) ) break;
122  }
123  j = ( j + T2.size() - 1 ) % T2.size();
124  if ( j != last_j )
125  { // display fully subconvex segments
126  aBoard.setLineWidth( 2.5 );
127  aBoard.drawLine( RT[i][0], RT[i][1], RT[j][0], RT[j][1] );
128  }
129  last_j = j;
130  }
131  trace.endBlock();
132  aBoard.saveEPS( "myGridCurve.eps", Board2D::BoundingBox );//, 5000 );
133  trace.endBlock();
134  return 0;
135 }
136 // //
Aim: This class specializes a 'Board' class so as to display DGtal objects more naturally (with <<)....
Definition: Board2D.h:71
Structure representing an RGB triple with alpha component.
Definition: Color.h:67
Aim: A helper class to build polytopes from digital sets and to check digital k-convexity.
Aim: describes, in a cellular space of dimension n, a closed or open sequence of signed d-cells (or d...
Definition: GridCurve.h:173
bool initFromPointsRange(const TIterator &itb, const TIterator &ite)
Aim: This class is a model of CCellularGridSpaceND. It represents the cubical grid as a cell complex,...
Cell uCell(const PreCell &c) const
From an unsigned cell, returns an unsigned cell lying into this Khalismky space.
void beginBlock(const std::string &keyword="")
double endBlock()
Board & setPenColor(const DGtal::Color &color)
Definition: Board.cpp:298
void drawLine(double x1, double y1, double x2, double y2, int depthValue=-1)
Definition: Board.cpp:368
Board & setPenColorRGBi(unsigned char red, unsigned char green, unsigned char blue, unsigned char alpha=255)
Definition: Board.cpp:278
Board & setLineWidth(double width)
Definition: Board.cpp:329
void saveEPS(const char *filename, PageSize size=Board::BoundingBox, double margin=10.0) const
Definition: Board.cpp:805
void setUnit(Unit unit)
Definition: Board.cpp:240
DGtal is the top-level namespace which contains all DGtal functions and types.
Trace trace
Definition: Common.h:154
Custom style class redefining the pen color and the fill color. You may use Board2D::Color::None for ...
Definition: Board2D.h:279
int main(int argc, char **argv)
MyPointD Point
Definition: testClone2.cpp:383
KSpace K