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<div class="section">
<div class="titlepage"><div><div><h4 class="title">
<a name="geometry.reference.views.segment_view"></a><a class="link" href="segment_view.html" title="segment_view">segment_view</a>
</h4></div></div></div>
<p>
<a class="indexterm" name="id975768"></a>
Makes a segment behave like a linestring or a range.
</p>
<h6>
<a name="geometry.reference.views.segment_view.h0"></a>
<span><a name="geometry.reference.views.segment_view.description"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.description">Description</a>
</h6>
<p>
Adapts a segment to the Boost.Range concept, enabling the user to iterate
the two segment points. The segment_view is registered as a LineString
Concept
</p>
<h6>
<a name="geometry.reference.views.segment_view.h1"></a>
<span><a name="geometry.reference.views.segment_view.model_of"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.model_of">Model
of</a>
</h6>
<p>
<a class="link" href="../concepts/concept_linestring.html" title="Linestring Concept">LineString
Concept</a>
</p>
<h6>
<a name="geometry.reference.views.segment_view.h2"></a>
<span><a name="geometry.reference.views.segment_view.synopsis"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.synopsis">Synopsis</a>
</h6>
<p>
</p>
<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Segment</span><span class="special">></span>
<span class="keyword">struct</span> <span class="identifier">segment_view</span>
<span class="special">{</span>
<span class="comment">// ...</span>
<span class="special">};</span>
</pre>
<p>
</p>
<h6>
<a name="geometry.reference.views.segment_view.h3"></a>
<span><a name="geometry.reference.views.segment_view.template_parameter_s_"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.template_parameter_s_">Template
parameter(s)</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
typename Segment
</p>
</td>
<td>
<p>
A type fulfilling the Segment Concept
</p>
</td>
</tr></tbody>
</table></div>
<h6>
<a name="geometry.reference.views.segment_view.h4"></a>
<span><a name="geometry.reference.views.segment_view.constructor_s_"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.constructor_s_">Constructor(s)</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Function
</p>
</th>
<th>
<p>
Description
</p>
</th>
<th>
<p>
Parameters
</p>
</th>
</tr></thead>
<tbody><tr>
<td>
<p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">segment_view</span><span class="special">(</span><span class="identifier">Segment</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">segment</span><span class="special">)</span></pre>
<p>
</p>
</td>
<td>
<p>
Constructor accepting the segment to adapt.
</p>
</td>
<td>
<p>
<span class="bold"><strong>Segment const &</strong></span>: <span class="emphasis"><em>segment</em></span>:
</p>
</td>
</tr></tbody>
</table></div>
<h6>
<a name="geometry.reference.views.segment_view.h5"></a>
<span><a name="geometry.reference.views.segment_view.header"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.header">Header</a>
</h6>
<p>
Either
</p>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<p>
Or
</p>
<p>
<code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">views</span><span class="special">/</span><span class="identifier">segment_view</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<h6>
<a name="geometry.reference.views.segment_view.h6"></a>
<span><a name="geometry.reference.views.segment_view.complexity"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.complexity">Complexity</a>
</h6>
<p>
Compile time
</p>
<h6>
<a name="geometry.reference.views.segment_view.h7"></a>
<span><a name="geometry.reference.views.segment_view.example"></a></span><a class="link" href="segment_view.html#geometry.reference.views.segment_view.example">Example</a>
</h6>
<p>
Shows usage of the Boost.Range compatible view on a box
</p>
<p>
</p>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
<span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">segment</span>
<span class="special"><</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">point</span><span class="special"><</span><span class="keyword">double</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">cs</span><span class="special">::</span><span class="identifier">cartesian</span><span class="special">></span>
<span class="special">></span> <span class="identifier">segment_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">segment_view</span><span class="special"><</span><span class="identifier">segment_type</span><span class="special">></span> <span class="identifier">segment_view</span><span class="special">;</span>
<span class="identifier">segment_type</span> <span class="identifier">segment</span><span class="special">;</span>
<span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">assign_values</span><span class="special">(</span><span class="identifier">segment</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="number">1</span><span class="special">,</span> <span class="number">1</span><span class="special">);</span>
<span class="identifier">segment_view</span> <span class="identifier">view</span><span class="special">(</span><span class="identifier">segment</span><span class="special">);</span>
<span class="comment">// Iterating over the points of this segment</span>
<span class="keyword">for</span> <span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">range_iterator</span><span class="special"><</span><span class="identifier">segment_view</span> <span class="keyword">const</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">it</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">begin</span><span class="special">(</span><span class="identifier">view</span><span class="special">);</span>
<span class="identifier">it</span> <span class="special">!=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">end</span><span class="special">(</span><span class="identifier">view</span><span class="special">);</span> <span class="special">++</span><span class="identifier">it</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">" "</span> <span class="special"><<</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">dsv</span><span class="special">(*</span><span class="identifier">it</span><span class="special">);</span>
<span class="special">}</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="comment">// Note that a segment_view is tagged as a linestring, so supports length etc.</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"Length: "</span> <span class="special"><<</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">length</span><span class="special">(</span><span class="identifier">view</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
</p>
<p>
Output:
</p>
<pre class="programlisting">(0, 0) (0, 4) (4, 4) (4, 0) (0, 0)
Area: 16
</pre>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2009-2012 Barend
Gehrels, Bruno Lalande, Mateusz Loskot<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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