libs/geometry/doc/html/geometry/reference/algorithms/assign/assign_values_3_2_coordinate_values.html

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  25 <div class="section">
  26 <div class="titlepage"><div><div><h5 class="title">
  27 <a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values"></a><a class="link" href="assign_values_3_2_coordinate_values.html" title="assign_values (2 coordinate values)">assign_values
  28           (2 coordinate values)</a>
  29 </h5></div></div></div>
  30 <p>
  31             <a class="indexterm" name="idp109859632"></a>
  32 Assign two coordinates to a geometry (usually a 2D point)
  33           </p>
  34 <h6>
  35 <a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.h0"></a>
  36             <span class="phrase"><a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.synopsis"></a></span><a class="link" href="assign_values_3_2_coordinate_values.html#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.synopsis">Synopsis</a>
  37           </h6>
  38 <p>
  39 </p>
  40 <pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Type</span><span class="special">&gt;</span>
  41 <span class="keyword">void</span> <span class="identifier">assign_values</span><span class="special">(</span><span class="identifier">Geometry</span> <span class="special">&amp;</span> <span class="identifier">geometry</span><span class="special">,</span> <span class="identifier">Type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">c1</span><span class="special">,</span> <span class="identifier">Type</span> <span class="keyword">const</span> <span class="special">&amp;</span> <span class="identifier">c2</span><span class="special">)</span></pre>
  42 <p>
  43           </p>
  44 <h6>
  45 <a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.h1"></a>
  46             <span class="phrase"><a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.parameters"></a></span><a class="link" href="assign_values_3_2_coordinate_values.html#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.parameters">Parameters</a>
  47           </h6>
  48 <div class="informaltable"><table class="table">
  49 <colgroup>
  50 <col>
  51 <col>
  52 <col>
  53 <col>
  54 </colgroup>
  55 <thead><tr>
  56 <th>
  57                     <p>
  58                       Type
  59                     </p>
  60                   </th>
  61 <th>
  62                     <p>
  63                       Concept
  64                     </p>
  65                   </th>
  66 <th>
  67                     <p>
  68                       Name
  69                     </p>
  70                   </th>
  71 <th>
  72                     <p>
  73                       Description
  74                     </p>
  75                   </th>
  76 </tr></thead>
  77 <tbody>
  78 <tr>
  79 <td>
  80                     <p>
  81                       Geometry &amp;
  82                     </p>
  83                   </td>
  84 <td>
  85                     <p>
  86                       Any type fulfilling a Geometry Concept
  87                     </p>
  88                   </td>
  89 <td>
  90                     <p>
  91                       geometry
  92                     </p>
  93                   </td>
  94 <td>
  95                     <p>
  96                       A model of the specified concept
  97                     </p>
  98                   </td>
  99 </tr>
 100 <tr>
 101 <td>
 102                     <p>
 103                       Type const &amp;
 104                     </p>
 105                   </td>
 106 <td>
 107                     <p>
 108                       numerical type (int, double, ttmath, ...) to specify the coordinates
 109                     </p>
 110                   </td>
 111 <td>
 112                     <p>
 113                       c1
 114                     </p>
 115                   </td>
 116 <td>
 117                     <p>
 118                       First coordinate (usually x-coordinate)
 119                     </p>
 120                   </td>
 121 </tr>
 122 <tr>
 123 <td>
 124                     <p>
 125                       Type const &amp;
 126                     </p>
 127                   </td>
 128 <td>
 129                     <p>
 130                       numerical type (int, double, ttmath, ...) to specify the coordinates
 131                     </p>
 132                   </td>
 133 <td>
 134                     <p>
 135                       c2
 136                     </p>
 137                   </td>
 138 <td>
 139                     <p>
 140                       Second coordinate (usually y-coordinate)
 141                     </p>
 142                   </td>
 143 </tr>
 144 </tbody>
 145 </table></div>
 146 <h6>
 147 <a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.h2"></a>
 148             <span class="phrase"><a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.header"></a></span><a class="link" href="assign_values_3_2_coordinate_values.html#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.header">Header</a>
 149           </h6>
 150 <p>
 151             Either
 152           </p>
 153 <p>
 154             <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span></code>
 155           </p>
 156 <p>
 157             Or
 158           </p>
 159 <p>
 160             <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">algorithms</span><span class="special">/</span><span class="identifier">assign</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>
 161           </p>
 162 <h6>
 163 <a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.h3"></a>
 164             <span class="phrase"><a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.example"></a></span><a class="link" href="assign_values_3_2_coordinate_values.html#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.example">Example</a>
 165           </h6>
 166 <p>
 167             Shows the usage of assign to set point coordinates, and, besides that,
 168             shows how you can initialize ttmath points with high precision
 169           </p>
 170 <p>
 171 </p>
 172 <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>
 173 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iomanip</span><span class="special">&gt;</span>
 174
 175 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
 176 <span class="preprocessor">#include</span> <span class="special">&lt;</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">&gt;</span>
 177
 178 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">HAVE_TTMATH</span><span class="special">)</span>
 179 <span class="preprocessor">#  include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">extensions</span><span class="special">/</span><span class="identifier">contrib</span><span class="special">/</span><span class="identifier">ttmath_stub</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
 180 <span class="preprocessor">#endif</span>
 181
 182
 183 <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
 184 <span class="special">{</span>
 185     <span class="keyword">using</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>
 186
 187
 188     <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">&lt;</span><span class="keyword">double</span><span class="special">&gt;</span> <span class="identifier">p1</span><span class="special">;</span>
 189     <span class="identifier">assign_values</span><span class="special">(</span><span class="identifier">p1</span><span class="special">,</span> <span class="number">1.2345</span><span class="special">,</span> <span class="number">2.3456</span><span class="special">);</span>
 190
 191 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">HAVE_TTMATH</span><span class="special">)</span>
 192     <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">&lt;</span><span class="identifier">ttmath</span><span class="special">::</span><span class="identifier">Big</span><span class="special">&lt;</span><span class="number">1</span><span class="special">,</span><span class="number">4</span><span class="special">&gt;</span> <span class="special">&gt;</span> <span class="identifier">p2</span><span class="special">;</span>
 193     <span class="identifier">assign_values</span><span class="special">(</span><span class="identifier">p2</span><span class="special">,</span> <span class="string">"1.2345"</span><span class="special">,</span> <span class="string">"2.3456"</span><span class="special">);</span> <a class="co" name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.c0" href="assign_values_3_2_coordinate_values.html#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.c1"><img src="../../../../../../../../doc/src/images/callouts/1.png" alt="1" border="0"></a>
 194 <span class="preprocessor">#endif</span>
 195
 196     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span>
 197         <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">setprecision</span><span class="special">(</span><span class="number">20</span><span class="special">)</span>
 198         <span class="special">&lt;&lt;</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">p1</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
 199 <span class="preprocessor">#if</span> <span class="identifier">defined</span><span class="special">(</span><span class="identifier">HAVE_TTMATH</span><span class="special">)</span>
 200         <span class="special">&lt;&lt;</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">p2</span><span class="special">)</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span>
 201 <span class="preprocessor">#endif</span>
 202         <span class="special">;</span>
 203
 204     <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
 205 <span class="special">}</span>
 206 </pre>
 207 <p>
 208           </p>
 209 <div class="calloutlist"><table border="0" summary="Callout list"><tr>
 210 <td width="5%" valign="top" align="left"><p><a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.c1"></a><a href="#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.c0"><img src="../../../../../../../../doc/src/images/callouts/1.png" alt="1" border="0"></a> </p></td>
 211 <td valign="top" align="left"><p>
 212                 It is possible to assign coordinates with other types than the coordinate
 213                 type. For ttmath, you can e.g. conveniently use strings. The advantage
 214                 is that it then has higher precision, because if doubles are used
 215                 for assignments the double-precision is used.
 216               </p></td>
 217 </tr></table></div>
 218 <p>
 219             Output:
 220           </p>
 221 <pre class="programlisting">(1.2344999999999999, 2.3456000000000001)
 222 (1.2345, 2.3456)
 223 </pre>
 224 <h6>
 225 <a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.h4"></a>
 226             <span class="phrase"><a name="geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.see_also"></a></span><a class="link" href="assign_values_3_2_coordinate_values.html#geometry.reference.algorithms.assign.assign_values_3_2_coordinate_values.see_also">See
 227             also</a>
 228           </h6>
 229 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
 230                 <a class="link" href="../make/make_2_2_coordinate_values.html" title="make (2 coordinate values)">make</a>
 231               </li></ul></div>
 232 </div>
 233 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 234 <td align="left"></td>
 235 <td align="right"><div class="copyright-footer">Copyright &#169; 2009-2014 Barend Gehrels, Bruno Lalande, Mateusz Loskot, Adam
 236       Wulkiewicz, Oracle and/or its affiliates<p>
 237         Distributed under the Boost Software License, Version 1.0. (See accompanying
 238         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>)
 239       </p>
 240 </div></td>
 241 </tr></table>
 242 <hr>
 243 <div class="spirit-nav">
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