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| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="geometry.reference.access.get.get_1"></a><a class="link" href="get_1.html" title="get">get</a> |
| </h5></div></div></div> |
| <p> |
| <a class="indexterm" name="idp101308720"></a> |
| Get coordinate value of a geometry (usually a point) |
| </p> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h0"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.description"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.description">Description</a> |
| </h6> |
| <p> |
| The free functions <span class="bold"><strong>get</strong></span> and <span class="bold"><strong>set</strong></span> are two of the most important functions of |
| Boost.Geometry, both within the library, as also for the library user. |
| With these two functions you normally get and set coordinate values from |
| and for a point, box, segment or sphere. |
| </p> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h1"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.synopsis"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.synopsis">Synopsis</a> |
| </h6> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">Dimension</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">></span> |
| <span class="identifier">coordinate_type</span><span class="special"><</span><span class="identifier">Geometry</span><span class="special">>::</span><span class="identifier">type</span> <span class="identifier">get</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="keyword">const</span> <span class="special">&</span> <span class="identifier">geometry</span><span class="special">)</span></pre> |
| <p> |
| </p> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h2"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.parameters"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.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> |
| Dimension |
| </p> |
| </td> |
| <td> |
| <p> |
| Dimension, this template parameter is required. Should contain |
| [0 .. n-1] for an n-dimensional geometry |
| </p> |
| </td> |
| <td> |
| <p> |
| - |
| </p> |
| </td> |
| <td> |
| <p> |
| Must be specified |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Geometry const & |
| </p> |
| </td> |
| <td> |
| <p> |
| Any type fulfilling a Geometry Concept (usually a Point Concept) |
| </p> |
| </td> |
| <td> |
| <p> |
| geometry |
| </p> |
| </td> |
| <td> |
| <p> |
| A model of the specified concept (usually a point) |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h3"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.returns"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.returns">Returns</a> |
| </h6> |
| <p> |
| The coordinate value of specified dimension of specified geometry |
| </p> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h4"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.header"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.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">core</span><span class="special">/</span><span class="identifier">access</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h5"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.behavior"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.behavior">Behavior</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Case |
| </p> |
| </th> |
| <th> |
| <p> |
| Behavior |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| Point |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the coordinate of a point |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Circle or Sphere |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the coordinate of the center of a circle or sphere |
| (currently in an extension) |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| Spherical |
| </p> |
| </td> |
| <td> |
| <p> |
| Returns the coordinate of a point, in either Radian's or Degree's, |
| depending on specified units |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h6"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.complexity"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.complexity">Complexity</a> |
| </h6> |
| <p> |
| Constant |
| </p> |
| <h6> |
| <a name="geometry.reference.access.get.get_1.h7"></a> |
| <span class="phrase"><a name="geometry.reference.access.get.get_1.example"></a></span><a class="link" href="get_1.html#geometry.reference.access.get.get_1.example">Example</a> |
| </h6> |
| <p> |
| Get the coordinate of a point |
| </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="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="keyword">namespace</span> <span class="identifier">bg</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="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> |
| <span class="special">{</span> |
| <span class="identifier">bg</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</span><span class="special">(</span><span class="number">1</span><span class="special">,</span> <span class="number">2</span><span class="special">);</span> |
| |
| <span class="keyword">double</span> <span class="identifier">x</span> <span class="special">=</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">get</span><span class="special"><</span><span class="number">0</span><span class="special">>(</span><span class="identifier">point</span><span class="special">);</span> |
| <span class="keyword">double</span> <span class="identifier">y</span> <span class="special">=</span> <span class="identifier">bg</span><span class="special">::</span><span class="identifier">get</span><span class="special"><</span><span class="number">1</span><span class="special">>(</span><span class="identifier">point</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">"x="</span> <span class="special"><<</span> <span class="identifier">x</span> <span class="special"><<</span> <span class="string">" y="</span> <span class="special"><<</span> <span class="identifier">y</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">x=1 y=2 |
| </pre> |
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| 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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