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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="geometry.reference.io.wkt.read_wkt"></a><a class="link" href="read_wkt.html" title="read_wkt">read_wkt</a>
</h5></div></div></div>
<p>
<a class="indexterm" name="idp123609696"></a>
Parses OGC Well-Known Text (WKT (Well-Known Text)) into a geometry (any
geometry)
</p>
<h6>
<a name="geometry.reference.io.wkt.read_wkt.h0"></a>
<span class="phrase"><a name="geometry.reference.io.wkt.read_wkt.synopsis"></a></span><a class="link" href="read_wkt.html#geometry.reference.io.wkt.read_wkt.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">Geometry</span><span class="special">></span>
<span class="keyword">void</span> <span class="identifier">read_wkt</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">wkt</span><span class="special">,</span> <span class="identifier">Geometry</span> <span class="special">&</span> <span class="identifier">geometry</span><span class="special">)</span></pre>
<p>
</p>
<h6>
<a name="geometry.reference.io.wkt.read_wkt.h1"></a>
<span class="phrase"><a name="geometry.reference.io.wkt.read_wkt.parameters"></a></span><a class="link" href="read_wkt.html#geometry.reference.io.wkt.read_wkt.parameters">Parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Type
</p>
</th>
<th>
<p>
Concept
</p>
</th>
<th>
<p>
Name
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
std::string const &
</p>
</td>
<td>
</td>
<td>
<p>
wkt
</p>
</td>
<td>
<p>
string containing WKT (Well-Known Text)
</p>
</td>
</tr>
<tr>
<td>
<p>
Geometry &
</p>
</td>
<td>
<p>
Any type fulfilling a Geometry Concept
</p>
</td>
<td>
<p>
geometry
</p>
</td>
<td>
<p>
A model of the specified concept output geometry
</p>
</td>
</tr>
</tbody>
</table></div>
<h6>
<a name="geometry.reference.io.wkt.read_wkt.h2"></a>
<span class="phrase"><a name="geometry.reference.io.wkt.read_wkt.header"></a></span><a class="link" href="read_wkt.html#geometry.reference.io.wkt.read_wkt.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">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">io</span><span class="special">/</span><span class="identifier">wkt</span><span class="special">/</span><span class="identifier">read</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code>
</p>
<h6>
<a name="geometry.reference.io.wkt.read_wkt.h3"></a>
<span class="phrase"><a name="geometry.reference.io.wkt.read_wkt.conformance"></a></span><a class="link" href="read_wkt.html#geometry.reference.io.wkt.read_wkt.conformance">Conformance</a>
</h6>
<p>
Other libraries refer to this functionality as <span class="bold"><strong>ST_GeomFromText</strong></span>
or <span class="bold"><strong>STGeomFromText</strong></span>. That is not done
here because Boost.Geometry support more text formats. The name GeomFromText
is reserved for future usage, which will then have an indication of the
used text format.
</p>
<h6>
<a name="geometry.reference.io.wkt.read_wkt.h4"></a>
<span class="phrase"><a name="geometry.reference.io.wkt.read_wkt.example"></a></span><a class="link" href="read_wkt.html#geometry.reference.io.wkt.read_wkt.example">Example</a>
</h6>
<p>
Shows the usage of read_wkt
</p>
<p>
</p>
<pre class="programlisting"><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="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">geometries</span><span class="special">/</span><span class="identifier">point_xy</span><span class="special">.</span><span class="identifier">hpp</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">geometries</span><span class="special">/</span><span class="identifier">linestring</span><span class="special">.</span><span class="identifier">hpp</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">geometries</span><span class="special">/</span><span class="identifier">polygon</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">d2</span><span class="special">::</span><span class="identifier">point_xy</span><span class="special"><</span><span class="keyword">double</span><span class="special">></span> <span class="identifier">point_type</span><span class="special">;</span>
<span class="identifier">point_type</span> <span class="identifier">a</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">linestring</span><span class="special"><</span><span class="identifier">point_type</span><span class="special">></span> <span class="identifier">b</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">polygon</span><span class="special"><</span><span class="identifier">point_type</span><span class="special">></span> <span class="identifier">c</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">box</span><span class="special"><</span><span class="identifier">point_type</span><span class="special">></span> <span class="identifier">d</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">segment</span><span class="special"><</span><span class="identifier">point_type</span><span class="special">></span> <span class="identifier">e</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">read_wkt</span><span class="special">(</span><span class="string">"POINT(1 2)"</span><span class="special">,</span> <span class="identifier">a</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">read_wkt</span><span class="special">(</span><span class="string">"LINESTRING(0 0,2 2,3 1)"</span><span class="special">,</span> <span class="identifier">b</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">read_wkt</span><span class="special">(</span><span class="string">"POLYGON((0 0,0 7,4 2,2 0,0 0))"</span><span class="special">,</span> <span class="identifier">c</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">read_wkt</span><span class="special">(</span><span class="string">"BOX(0 0,3 3)"</span><span class="special">,</span> <span class="identifier">d</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">read_wkt</span><span class="special">(</span><span class="string">"SEGMENT(1 0,3 4)"</span><span class="special">,</span> <span class="identifier">e</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>
<h6>
<a name="geometry.reference.io.wkt.read_wkt.h5"></a>
<span class="phrase"><a name="geometry.reference.io.wkt.read_wkt.see_also"></a></span><a class="link" href="read_wkt.html#geometry.reference.io.wkt.read_wkt.see_also">See
also</a>
</h6>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
<a class="link" href="wkt.html" title="wkt">WKT streaming manipulator</a>
</li></ul></div>
</div>
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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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