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LSSTDataManagementBasePackage
SpanPixelIterator.h
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1 // -*- lsst-c++ -*-
2 
3 /*
4  * LSST Data Management System
5  * Copyright 2008, 2009, 2010 LSST Corporation.
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8  * LSST Project (http://www.lsst.org/).
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24 
25 #ifndef LSST_AFW_GEOM_SpanPixelIterator_h_INCLUDED
26 #define LSST_AFW_GEOM_SpanPixelIterator_h_INCLUDED
27 
28 #include "boost/iterator/iterator_facade.hpp"
29 
30 #include "lsst/afw/geom/Point.h"
31 
32 namespace lsst { namespace afw { namespace geom {
33 
41  public boost::iterator_facade<SpanPixelIterator,Point2I const,boost::random_access_traversal_tag>
42 {
43 public:
44 
45  explicit SpanPixelIterator(Point2I const & p = Point2I()) : _p(p) {}
46 
47 private:
48 
50 
51  Point2I const & dereference() const { return _p; }
52 
53  void increment() { ++_p.getX(); }
54 
55  void decrement() { --_p.getX(); }
56 
57  void advance(int n) { _p.getX() += n; }
58 
59  bool equal(SpanPixelIterator const & other) const {
60  return _p.getX() == other._p.getX() && _p.getY() == other._p.getY();
61  }
62 
63  int distance_to(SpanPixelIterator const & other) const {
64  assert(other._p.getY() == _p.getY());
65  return other._p.getX() - _p.getX();
66  }
67 
69 };
70 
71 }}} // namespace lsst::afw::geom
72 
73 #endif // !LSST_AFW_GEOM_SpanPixelIterator_h_INCLUDED
An iterator that yields Point2I and increases in the x direction.
A coordinate class intended to represent absolute positions.
friend class boost::iterator_core_access
Point< int, 2 > Point2I
Definition: PSF.h:39
int distance_to(SpanPixelIterator const &other) const
Point2I const & dereference() const
bool equal(SpanPixelIterator const &other) const
SpanPixelIterator(Point2I const &p=Point2I())