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22 <TITLE>Generic Image Library: pixel_2d_locator_base Class Template Reference
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38 <div class=
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</a>::
<b>gil
</b>::
<a class=
"el" href=
"g_i_l_0058.html">pixel_2d_locator_base
</a>
40 <div class=
"contents">
41 <h1>pixel_2d_locator_base Class Template Reference
<br>
43 [
<a class=
"el" href=
"g_i_l_0205.html">Models
</a>,
<a class=
"el" href=
"g_i_l_0182.html">Models
</a>]
</small>
44 </h1><!-- doxytag: class="boost::gil::pixel_2d_locator_base" --><code>#include
<<a class=
"el" href=
"g_i_l_0236.html">locator.hpp
</a>></code>
46 <div class=
"dynheader">
47 Inheritance diagram for pixel_2d_locator_base:
</div>
48 <div class=
"dynsection">
50 <p><center><img src=
"g_i_l_0008.png" usemap=
"#pixel_2d_locator_base_map" border=
"0" alt=
""></center>
51 <map name=
"pixel_2d_locator_base_map">
52 <area href=
"g_i_l_0044.html" alt=
"memory_based_2d_locator" shape=
"rect" coords=
"0,56,164,80">
53 <area href=
"g_i_l_0064.html" alt=
"virtual_2d_locator" shape=
"rect" coords=
"174,56,338,80">
58 <a href=
"g_i_l_0057.html">List of all members.
</a><hr><a name=
"_details"></a><h2>Detailed Description
</h2>
59 <h3>template
<typename Loc, typename XIterator, typename YIterator
><br>
60 class boost::gil::pixel_2d_locator_base
< Loc, XIterator, YIterator
></h3>
62 base class for models of
<a class=
"el" href=
"g_i_l_0354.html" title=
"GIL's 2-dimensional locator over immutable GIL pixels.">PixelLocatorConcept
</a><p>
63 Pixel locator is similar to a
<a class=
"el" href=
"g_i_l_0599.html" title=
"Represents a pixel value (a container of channels). Models: HomogeneousColorBaseValueConcept...">pixel
</a> iterator, but allows for
2D navigation of pixels within an
<a class=
"el" href=
"g_i_l_0038.html" title=
"container interface over image view. Models ImageConcept, PixelBasedConcept">image
</a> view. It has a
2D difference_type and supports random access operations like:
65 <div class=
"fragment"><pre class=
"fragment"> difference_type offset2(
2,
3);
67 locator[offset2]=my_pixel;
69 In addition, each coordinate acts as a random-access iterator that can be modified separately:
"++locator.x()" or
"locator.y()+=10" thereby moving the locator horizontally or vertically.
<p>
70 It is called a locator because it doesn't implement the complete interface of a random access iterator. For example, increment and decrement operations don't make sense (no way to specify dimension). Also
2D difference between two locators cannot be computed without knowledge of the X position within the
<a class=
"el" href=
"g_i_l_0038.html" title=
"container interface over image view. Models ImageConcept, PixelBasedConcept">image
</a>.
<p>
71 This base class provides most of the methods and typedefs needed to create a model of a locator. GIL provides two locator models as subclasses of
<code><a class=
"el" href=
"g_i_l_0058.html" title=
"base class for models of PixelLocatorConceptPixel locator is similar to a pixel iterator...">pixel_2d_locator_base
</a></code>. A memory-based locator,
<code><a class=
"el" href=
"g_i_l_0044.html" title=
"Memory-based pixel locator. Models: PixelLocatorConcept,HasDynamicXStepTypeConcept...">memory_based_2d_locator
</a></code> and a virtual locator,
<code><a class=
"el" href=
"g_i_l_0064.html" title=
"A 2D locator over a virtual image. Upon dereferencing, invokes a given function object...">virtual_2d_locator
</a></code>. The minimum functionality a subclass must provide is this:
<div class=
"fragment"><pre class=
"fragment"> <span class=
"keyword">class
</span>my_locator :
<span class=
"keyword">public
</span> pixel_2d_locator_base
<my_locator, ..., ...
> {
<span class=
"comment">// supply the types for x-iterator and y-iterator
</span>
72 <span class=
"keyword">typedef
</span> ... const_t;
<span class=
"comment">// read-only locator
</span>
74 <span class=
"keyword">template
</span> <<span class=
"keyword">typename
</span> Deref
> <span class=
"keyword">struct
</span>add_deref {
75 <span class=
"keyword">typedef
</span> ... type;
<span class=
"comment">// locator that invokes the Deref dereference object upon pixel access
</span>
76 <span class=
"keyword">static
</span> type make(
<span class=
"keyword">const
</span> my_locator
& loc,
<span class=
"keyword">const
</span> Deref
& d);
80 my_locator(
<span class=
"keyword">const
</span> my_locator
& pl);
82 <span class=
"comment">// constructors with dynamic step in y (and x). Only valid for locators with dynamic steps
</span>
83 my_locator(
<span class=
"keyword">const
</span> my_locator
& loc, coord_t y_step);
84 my_locator(
<span class=
"keyword">const
</span> my_locator
& loc, coord_t x_step, coord_t y_step,
<span class=
"keywordtype">bool
</span> transpose);
86 <span class=
"keywordtype">bool
</span> operator==(
<span class=
"keyword">const
</span> my_locator
& p)
<span class=
"keyword">const
</span>;
88 <span class=
"comment">// return _references_ to horizontal/vertical iterators. Advancing them moves this locator
</span>
91 x_iterator
<span class=
"keyword">const
</span>& x()
<span class=
"keyword">const
</span>;
92 y_iterator
<span class=
"keyword">const
</span>& y()
<span class=
"keyword">const
</span>;
94 <span class=
"comment">// return the vertical distance to another locator. Some models need the horizontal distance to compute it
</span>
95 y_coord_t y_distance_to(
<span class=
"keyword">const
</span> my_locator
& loc2, x_coord_t xDiff)
<span class=
"keyword">const
</span>;
97 <span class=
"comment">// return true iff incrementing an x-iterator located at the last column will position it at the first
</span>
98 <span class=
"comment">// column of the next row. Some models need the image width to determine that.
</span>
99 <span class=
"keywordtype">bool
</span> is_1d_traversable(x_coord_t width)
<span class=
"keyword">const
</span>;
102 Models may choose to override some of the functions in the base class with more efficient versions.
<table border=
"0" cellpadding=
"0" cellspacing=
"0">
104 <tr><td colspan=
"2"><br><h2>Public Types
</h2></td></tr>
105 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"e3d00803fa442dc8138e53c6fd6ff551"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::x_iterator" ref="e3d00803fa442dc8138e53c6fd6ff551" args="" -->
106 typedef XIterator
</td><td class=
"memItemRight" valign=
"bottom"><b>x_iterator
</b></td></tr>
108 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"1c26f78fc975b07e562860c6035b5c77"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::y_iterator" ref="1c26f78fc975b07e562860c6035b5c77" args="" -->
109 typedef YIterator
</td><td class=
"memItemRight" valign=
"bottom"><b>y_iterator
</b></td></tr>
111 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"8948d7b39ef0dc53a64eeadd1f120236"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::value_type" ref="8948d7b39ef0dc53a64eeadd1f120236" args="" -->
112 typedef std::iterator_traits
<br>
113 < x_iterator
>::value_type
</td><td class=
"memItemRight" valign=
"bottom"><b>value_type
</b></td></tr>
115 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"4c771c6b67581e966f3101a1b89b1984"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::reference" ref="4c771c6b67581e966f3101a1b89b1984" args="" -->
116 typedef std::iterator_traits
<br>
117 < x_iterator
>::reference
</td><td class=
"memItemRight" valign=
"bottom"><b>reference
</b></td></tr>
119 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"a5844f24fb8f1a0086e9682b95250cab"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::coord_t" ref="a5844f24fb8f1a0086e9682b95250cab" args="" -->
120 typedef std::iterator_traits
<br>
121 < x_iterator
><br>
122 ::
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> </td><td class=
"memItemRight" valign=
"bottom"><b>coord_t
</b></td></tr>
124 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"d9fb8862d623c886c8c2afbe30fe386e"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::difference_type" ref="d9fb8862d623c886c8c2afbe30fe386e" args="" -->
125 typedef
<a class=
"el" href=
"g_i_l_0060.html">point2
</a>< coord_t
> </td><td class=
"memItemRight" valign=
"bottom"><b>difference_type
</b></td></tr>
127 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"da4e134f4052097a3359396e730be85f"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::point_t" ref="da4e134f4052097a3359396e730be85f" args="" -->
128 typedef
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> </td><td class=
"memItemRight" valign=
"bottom"><b>point_t
</b></td></tr>
130 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"2f949a5fca986fca0058a1d0f288d9cf"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::x_coord_t" ref="2f949a5fca986fca0058a1d0f288d9cf" args="" -->
131 typedef point_t::template axis
<br>
132 < 0 >::coord_t
</td><td class=
"memItemRight" valign=
"bottom"><b>x_coord_t
</b></td></tr>
134 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"55d7968c5aa5022ee076def9ae3e4c97"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::y_coord_t" ref="55d7968c5aa5022ee076def9ae3e4c97" args="" -->
135 typedef point_t::template axis
<br>
136 < 1 >::coord_t
</td><td class=
"memItemRight" valign=
"bottom"><b>y_coord_t
</b></td></tr>
138 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"923cc58ccc57319b3b438070df9dbedd"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::cached_location_t" ref="923cc58ccc57319b3b438070df9dbedd" args="" -->
139 typedef
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> </td><td class=
"memItemRight" valign=
"bottom"><b>cached_location_t
</b></td></tr>
141 <tr><td colspan=
"2"><br><h2>Public Member Functions
</h2></td></tr>
142 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"5c6c2fc2ab0d5c3e10c8d78c1d83a5ae"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator!=" ref="5c6c2fc2ab0d5c3e10c8d78c1d83a5ae" args="(const Loc &p) const " -->
143 bool
</td><td class=
"memItemRight" valign=
"bottom"><b>operator!=
</b> (const Loc
&p) const
</td></tr>
145 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"a9c85632f9e9074e06d3e5f4e0c46f82"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::x_at" ref="a9c85632f9e9074e06d3e5f4e0c46f82" args="(x_coord_t dx, y_coord_t dy) const " -->
146 x_iterator
</td><td class=
"memItemRight" valign=
"bottom"><b>x_at
</b> (x_coord_t dx, y_coord_t dy) const
</td></tr>
148 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"e38d5bc61a3101e3bb7bd6ab0ff86e0d"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::x_at" ref="e38d5bc61a3101e3bb7bd6ab0ff86e0d" args="(const difference_type &d) const " -->
149 x_iterator
</td><td class=
"memItemRight" valign=
"bottom"><b>x_at
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
151 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"10a35d80a9ff2c5888f68527f332add2"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::y_at" ref="10a35d80a9ff2c5888f68527f332add2" args="(x_coord_t dx, y_coord_t dy) const " -->
152 y_iterator
</td><td class=
"memItemRight" valign=
"bottom"><b>y_at
</b> (x_coord_t dx, y_coord_t dy) const
</td></tr>
154 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"948188df93afb3e9076013cfb3334618"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::y_at" ref="948188df93afb3e9076013cfb3334618" args="(const difference_type &d) const " -->
155 y_iterator
</td><td class=
"memItemRight" valign=
"bottom"><b>y_at
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
157 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"54d7a594e81421cf0b5fbd0f0e83bdc8"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::xy_at" ref="54d7a594e81421cf0b5fbd0f0e83bdc8" args="(x_coord_t dx, y_coord_t dy) const " -->
158 Loc
</td><td class=
"memItemRight" valign=
"bottom"><b>xy_at
</b> (x_coord_t dx, y_coord_t dy) const
</td></tr>
160 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"8d5c54b73f9efe922043baac745e3676"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::xy_at" ref="8d5c54b73f9efe922043baac745e3676" args="(const difference_type &d) const " -->
161 Loc
</td><td class=
"memItemRight" valign=
"bottom"><b>xy_at
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
163 <tr><td class=
"memTemplParams" nowrap
colspan=
"2"><a class=
"anchor" name=
"1c63dd714aee21b469663d1178c954c8"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::axis_iterator" ref="1c63dd714aee21b469663d1178c954c8" args="()" -->
164 template
<std::size_t D
> </td></tr>
165 <tr><td class=
"memTemplItemLeft" nowrap
align=
"right" valign=
"top">axis
< D
>::iterator
& </td><td class=
"memTemplItemRight" valign=
"bottom"><b>axis_iterator
</b> ()
</td></tr>
167 <tr><td class=
"memTemplParams" nowrap
colspan=
"2"><a class=
"anchor" name=
"9225fcf12833f4fd4d61b86912cc2967"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::axis_iterator" ref="9225fcf12833f4fd4d61b86912cc2967" args="() const " -->
168 template
<std::size_t D
> </td></tr>
169 <tr><td class=
"memTemplItemLeft" nowrap
align=
"right" valign=
"top">axis
< D
>::iterator const
& </td><td class=
"memTemplItemRight" valign=
"bottom"><b>axis_iterator
</b> () const
</td></tr>
171 <tr><td class=
"memTemplParams" nowrap
colspan=
"2"><a class=
"anchor" name=
"ac46b196dfd20e7f9fc71a978b0034d6"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::axis_iterator" ref="ac46b196dfd20e7f9fc71a978b0034d6" args="(const point_t &p) const " -->
172 template
<std::size_t D
> </td></tr>
173 <tr><td class=
"memTemplItemLeft" nowrap
align=
"right" valign=
"top">axis
< D
>::iterator
</td><td class=
"memTemplItemRight" valign=
"bottom"><b>axis_iterator
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">point_t
</a> &p) const
</td></tr>
175 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"c2e37864c7119a0bfbf5343c4b91db73"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator()" ref="c2e37864c7119a0bfbf5343c4b91db73" args="(x_coord_t dx, y_coord_t dy) const " -->
176 reference
</td><td class=
"memItemRight" valign=
"bottom"><b>operator()
</b> (x_coord_t dx, y_coord_t dy) const
</td></tr>
178 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"4353d357fd57b04981e3a631b0b79a84"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator[]" ref="4353d357fd57b04981e3a631b0b79a84" args="(const difference_type &d) const " -->
179 reference
</td><td class=
"memItemRight" valign=
"bottom"><b>operator[]
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
181 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"a149c2249879e7727f33688b76bf2c99"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator*" ref="a149c2249879e7727f33688b76bf2c99" args="() const " -->
182 reference
</td><td class=
"memItemRight" valign=
"bottom"><b>operator*
</b> () const
</td></tr>
184 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"5183ba70dbe786e8dd0cb258b73ed2d2"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator+=" ref="5183ba70dbe786e8dd0cb258b73ed2d2" args="(const difference_type &d)" -->
185 Loc
& </td><td class=
"memItemRight" valign=
"bottom"><b>operator+=
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d)
</td></tr>
187 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"e4adb8167f7979861b075323379317de"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator-=" ref="e4adb8167f7979861b075323379317de" args="(const difference_type &d)" -->
188 Loc
& </td><td class=
"memItemRight" valign=
"bottom"><b>operator-=
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d)
</td></tr>
190 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"dff47b8c0f4c756c9b4a45888f9a81ce"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator+" ref="dff47b8c0f4c756c9b4a45888f9a81ce" args="(const difference_type &d) const " -->
191 Loc
</td><td class=
"memItemRight" valign=
"bottom"><b>operator+
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
193 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"4e0438f79c980e5eb7bed95560ef516b"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::operator-" ref="4e0438f79c980e5eb7bed95560ef516b" args="(const difference_type &d) const " -->
194 Loc
</td><td class=
"memItemRight" valign=
"bottom"><b>operator-
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
196 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"e448a693f3baaa731f1d70bb48609611"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::cache_location" ref="e448a693f3baaa731f1d70bb48609611" args="(const difference_type &d) const " -->
197 <a class=
"el" href=
"g_i_l_0060.html">cached_location_t
</a> </td><td class=
"memItemRight" valign=
"bottom"><b>cache_location
</b> (const
<a class=
"el" href=
"g_i_l_0060.html">difference_type
</a> &d) const
</td></tr>
199 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"2dafb8db61c81881f0d2d0e264ac8ed6"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::cache_location" ref="2dafb8db61c81881f0d2d0e264ac8ed6" args="(x_coord_t dx, y_coord_t dy) const " -->
200 <a class=
"el" href=
"g_i_l_0060.html">cached_location_t
</a> </td><td class=
"memItemRight" valign=
"bottom"><b>cache_location
</b> (x_coord_t dx, y_coord_t dy) const
</td></tr>
202 <tr><td colspan=
"2"><br><h2>Static Public Attributes
</h2></td></tr>
203 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"cf81c27b3fffa67d66b47f46979b607e"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::num_dimensions" ref="cf81c27b3fffa67d66b47f46979b607e" args="" -->
204 static const std::size_t
</td><td class=
"memItemRight" valign=
"bottom"><b>num_dimensions
</b> =
2</td></tr>
206 <tr><td colspan=
"2"><br><h2>Friends
</h2></td></tr>
207 <tr><td class=
"memItemLeft" nowrap
align=
"right" valign=
"top"><a class=
"anchor" name=
"9ba84c0f7be73a7130508a02eefbdad6"></a><!-- doxytag: member="boost::gil::pixel_2d_locator_base::pixel_2d_locator" ref="9ba84c0f7be73a7130508a02eefbdad6" args="" -->
208 class
</td><td class=
"memItemRight" valign=
"bottom"><b>pixel_2d_locator
</b></td></tr>
211 <hr>The documentation for this class was generated from the following file:
<ul>
212 <li><a class=
"el" href=
"g_i_l_0236.html">locator.hpp
</a></ul>
214 <hr size=
"1"><address style=
"text-align: right;"><small>Generated on Sat May
2 13:
50:
18 2009 for Generic Image Library by
215 <a href=
"http://www.doxygen.org/index.html">
216 <img src=
"doxygen.png" alt=
"doxygen" align=
"middle" border=
"0"></a> 1.5.6 </small></address>