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LSSTDataManagementBasePackage
PixelRegion.h
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23 
24 #ifndef LSST_AFW_GEOM_ELLIPSES_PixelRegion_h_INCLUDED
25 #define LSST_AFW_GEOM_ELLIPSES_PixelRegion_h_INCLUDED
26 
27 #include "boost/iterator/iterator_facade.hpp"
28 
29 #include "lsst/afw/geom/Span.h"
30 #include "lsst/afw/geom/Box.h"
32 
33 namespace lsst { namespace afw { namespace geom { namespace ellipses {
34 
35 class PixelRegion {
36 public:
37 
38 #ifndef SWIG
39  class Iterator;
40 
41  Iterator begin() const;
42  Iterator end() const;
43 #endif
44 
45  Box2I const & getBBox() const { return _bbox; }
46 
47  Span const getSpanAt(int y) const;
48 
49  explicit PixelRegion(Ellipse const & ellipse);
50 
51 private:
53  double _detQ;
54  double _invQxx;
55  double _alpha;
57 };
58 
59 #ifndef SWIG
60 
62  public boost::iterator_facade<PixelRegion::Iterator,Span const,boost::random_access_traversal_tag> {
63 public:
64 
65  explicit Iterator(Span const & s = Span(0,0,0), PixelRegion const * region = NULL) :
66  _s(s), _region(region) {}
67 
68 private:
69 
71 
72  Span const & dereference() const { return _s; }
73 
74  void increment() { _s = _region->getSpanAt(_s.getY()+1); }
75 
76  void decrement() { _s = _region->getSpanAt(_s.getY()-1); }
77 
78  void advance(int n) { _s = _region->getSpanAt(_s.getY() + n); }
79 
80  bool equal(Iterator const & other) const { return _s == other._s; }
81 
82  int distance_to(Iterator const & other) const {
83  return other._s.getY() - _s.getY();
84  }
85 
88 };
89 
90 
92  return Iterator(getSpanAt(_bbox.getBeginY()), this);
93 }
95  return Iterator(getSpanAt(_bbox.getEndY()), this);
96 }
97 
98 #endif
99 
100 }}}} // namespace lsst::afw::geom::ellipses
101 
102 #endif // !LSST_AFW_GEOM_ELLIPSES_PixelRegion_h_INCLUDED
int y
bool equal(Iterator const &other) const
Definition: PixelRegion.h:80
A range of pixels within one row of an Image.
Definition: Span.h:54
Iterator(Span const &s=Span(0, 0, 0), PixelRegion const *region=NULL)
Definition: PixelRegion.h:65
int getEndY() const
Definition: Box.h:144
An integer coordinate rectangle.
Definition: Box.h:53
int distance_to(Iterator const &other) const
Definition: PixelRegion.h:82
An ellipse defined by an arbitrary BaseCore and a center point.
Definition: Ellipse.h:50
PixelRegion(Ellipse const &ellipse)
Box2I const & getBBox() const
Definition: PixelRegion.h:45
Forward declarations, typedefs, and definitions for Ellipse.
Span const getSpanAt(int y) const
int getY() const
Return the y-value.
Definition: Span.h:81
int getBeginY() const
Definition: Box.h:140