libs/geometry/doc/html/geometry/reference/concepts/concept_linestring.html


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<title>Linestring Concept</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="geometry.reference.concepts.concept_linestring"></a><a class="link" href="concept_linestring.html" title="Linestring Concept">Linestring
        Concept</a>
</h4></div></div></div>
<h6>
<a name="geometry.reference.concepts.concept_linestring.h0"></a>
          <span><a name="geometry.reference.concepts.concept_linestring.description"></a></span><a class="link" href="concept_linestring.html#geometry.reference.concepts.concept_linestring.description">Description</a>
        </h6>
<p>
          The Linestring Concept describes the requirements for a linestring type.
          All algorithms in Boost.Geometry will check any geometry arguments against
          the concept requirements.
        </p>
<p>
          A linestring is <span class="emphasis"><em>a Curve with linear interpolation between Points</em></span>.
          (<a href="http://www.opengeospatial.org/standards/sfa" target="_top">OGC Simple Feature
          Specification</a>).
        </p>
<h6>
<a name="geometry.reference.concepts.concept_linestring.h1"></a>
          <span><a name="geometry.reference.concepts.concept_linestring.concept_definition"></a></span><a class="link" href="concept_linestring.html#geometry.reference.concepts.concept_linestring.concept_definition">Concept
          Definition</a>
        </h6>
<p>
          The Linestring Concept is defined as following:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
              there must be a specialization of <code class="computeroutput"><span class="identifier">traits</span><span class="special">::</span><span class="identifier">tag</span></code>
              defining <code class="computeroutput"><span class="identifier">linestring_tag</span></code>
              as type
            </li>
<li class="listitem">
              it must behave like a Boost.Range Random Access Range
            </li>
<li class="listitem">
              The type defined by the metafunction <code class="computeroutput"><span class="identifier">range_value</span><span class="special">&lt;...&gt;::</span><span class="identifier">type</span></code>
              must fulfill the <a class="link" href="concept_point.html" title="Point Concept">Point
              Concept</a>
            </li>
</ul></div>
<h6>
<a name="geometry.reference.concepts.concept_linestring.h2"></a>
          <span><a name="geometry.reference.concepts.concept_linestring.rules"></a></span><a class="link" href="concept_linestring.html#geometry.reference.concepts.concept_linestring.rules">Rules</a>
        </h6>
<p>
          Besides the Concepts, which are checks on compile-time, there are rules
          that valid linestrings must fulfill. Most algorithms work on any linestring,
          so either self-crossing or not. However, for correct results using the
          overlay algorithms (intersection and difference algorithms in combination
          with a polygon) self-intersections can disturb the process and result in
          incorrect results.
        </p>
<h6>
<a name="geometry.reference.concepts.concept_linestring.h3"></a>
          <span><a name="geometry.reference.concepts.concept_linestring.available_models"></a></span><a class="link" href="concept_linestring.html#geometry.reference.concepts.concept_linestring.available_models">Available
          Models</a>
        </h6>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
              <a class="link" href="../models/model_linestring.html" title="model::linestring">model::linestring</a>
            </li>
<li class="listitem">
              a std::vector (requires registration)
            </li>
<li class="listitem">
              a std::deque (requires registration)
            </li>
</ul></div>
<div class="note"><table border="0" summary="Note">
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
            See also the sample in the <a href="../../../../../../range/doc/html/range/reference/extending/method_2.html" target="_top">Boost.Range
            documentation</a> showing how a type can be adapted to a Boost.Range
            to fulfill the concept of a Linestring
          </p></td></tr>
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<td align="right"><div class="copyright-footer">Copyright &#169; 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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