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22 | <TITLE>Generic Image Library: pixel_2d_locator_base Class Template Reference</TITLE> | |
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38 | <div class="navpath"><a class="el" href="namespaceboost.html">boost</a>::<b>gil</b>::<a class="el" href="g_i_l_0058.html">pixel_2d_locator_base</a> | |
39 | </div> | |
40 | <div class="contents"> | |
41 | <h1>pixel_2d_locator_base Class Template Reference<br> | |
42 | <small> | |
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> | |
45 | <p> | |
46 | <div class="dynheader"> | |
47 | Inheritance diagram for pixel_2d_locator_base:</div> | |
48 | <div class="dynsection"> | |
49 | ||
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"> | |
54 | </map> | |
55 | </div> | |
56 | ||
57 | <p> | |
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> | |
61 | ||
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: | |
64 | <p> | |
65 | <div class="fragment"><pre class="fragment"> difference_type offset2(2,3); | |
66 | locator+=offset2; | |
67 | locator[offset2]=my_pixel; | |
68 | </pre></div><p> | |
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> | |
73 | ||
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); | |
77 | }; | |
78 | ||
79 | my_locator(); | |
80 | my_locator(<span class="keyword">const</span> my_locator& pl); | |
81 | ||
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); | |
85 | ||
86 | <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> my_locator& p) <span class="keyword">const</span>; | |
87 | ||
88 | <span class="comment">// return _references_ to horizontal/vertical iterators. Advancing them moves this locator</span> | |
89 | x_iterator& x(); | |
90 | y_iterator& y(); | |
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>; | |
93 | ||
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>; | |
96 | ||
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>; | |
100 | }; | |
101 | </pre></div><p> | |
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"> | |
103 | <tr><td></td></tr> | |
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> | |
107 | ||
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> | |
110 | ||
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> | |
114 | ||
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> | |
118 | ||
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> | |
123 | ||
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> | |
126 | ||
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> | |
129 | ||
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> | |
133 | ||
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> | |
137 | ||
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> | |
140 | ||
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> | |
144 | ||
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> | |
147 | ||
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> | |
150 | ||
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> | |
153 | ||
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> | |
156 | ||
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> | |
159 | ||
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> | |
162 | ||
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> | |
166 | ||
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> | |
170 | ||
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> | |
174 | ||
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> | |
177 | ||
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> | |
180 | ||
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> | |
183 | ||
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> | |
186 | ||
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> | |
189 | ||
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> | |
192 | ||
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> | |
195 | ||
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> | |
198 | ||
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> | |
201 | ||
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> | |
205 | ||
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> | |
209 | ||
210 | </table> | |
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> | |
213 | </div> | |
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> | |
217 | </body> | |
218 | </html> |