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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> |
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| <h6> |
| <a name="geometry.reference.concepts.concept_linestring.h0"></a> |
| <span class="phrase"><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 class="phrase"><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" style="list-style-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"><...>::</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 class="phrase"><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 class="phrase"><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" style="list-style-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"> |
| <tr> |
| <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 |
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| <td align="right"><div class="copyright-footer">Copyright © 2009-2015 Barend Gehrels, Bruno Lalande, |
| Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its affiliates<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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