classogrgeometryfactory.html

gdal库的学习文档

<dl class="return" compact><dt><b>Returns:</b></dt><dd>a geometry on succes, or NULL on error. </dd></dl>

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<a class="anchor" name="ae001086e26985d95c36ccd255a8c6d5"></a><!-- doxytag: member="OGRGeometryFactory::destroyGeometry" ref="ae001086e26985d95c36ccd255a8c6d5" args="(OGRGeometry *)" -->
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          <td class="memname">void OGRGeometryFactory::destroyGeometry           </td>
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          <td class="paramtype"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> *&nbsp;</td>
          <td class="paramname"> <em>poGeom</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [static]</code></td>
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Destroy geometry object.<p>
Equivalent to invoking delete on a geometry, but it guaranteed to take place within the context of the GDAL/OGR heap.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#c4e665f5f9690c4fa0c190b930fe9492">OGR_G_DestroyGeometry()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>poGeom</em>&nbsp;</td><td>the geometry to deallocate. </td></tr>
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<a class="anchor" name="e4887e270d5099357f9a19b1eda6027a"></a><!-- doxytag: member="OGRGeometryFactory::createGeometry" ref="e4887e270d5099357f9a19b1eda6027a" args="(OGRwkbGeometryType)" -->
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          <td class="memname"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> * OGRGeometryFactory::createGeometry           </td>
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          <td class="paramtype">OGRwkbGeometryType&nbsp;</td>
          <td class="paramname"> <em>eGeometryType</em>          </td>
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Create an empty geometry of desired type.<p>
This is equivelent to allocating the desired geometry with new, but the allocation is guaranteed to take place in the context of the GDAL/OGR heap.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#4e47710cf70e5bc72216704ddfead0dd">OGR_G_CreateGeometry()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>eGeometryType</em>&nbsp;</td><td>the type code of the geometry class to be instantiated.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>the newly create geometry or NULL on failure. </dd></dl>

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<a class="anchor" name="fd61936e41ea69831b3196e817658d08"></a><!-- doxytag: member="OGRGeometryFactory::forceToPolygon" ref="fd61936e41ea69831b3196e817658d08" args="(OGRGeometry *)" -->
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          <td class="memname"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> * OGRGeometryFactory::forceToPolygon           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> *&nbsp;</td>
          <td class="paramname"> <em>poGeom</em>          </td>
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Convert to polygon.<p>
Tries to force the provided geometry to be a polygon. Currently this just effects a change on multipolygons. The passed in geometry is consumed and a new one returned (or potentially the same one).<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>new geometry. </dd></dl>

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<a class="anchor" name="2a40032fa65cc71c028516bf8fc0df3e"></a><!-- doxytag: member="OGRGeometryFactory::forceToMultiPolygon" ref="2a40032fa65cc71c028516bf8fc0df3e" args="(OGRGeometry *)" -->
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          <td class="memname"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> * OGRGeometryFactory::forceToMultiPolygon           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> *&nbsp;</td>
          <td class="paramname"> <em>poGeom</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [static]</code></td>
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Convert to multipolygon.<p>
Tries to force the provided geometry to be a multipolygon. Currently this just effects a change on polygons. The passed in geometry is consumed and a new one returned (or potentially the same one).<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>new geometry. </dd></dl>

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<a class="anchor" name="a97b7837101f6c56e476520d10a9f3c3"></a><!-- doxytag: member="OGRGeometryFactory::forceToMultiPoint" ref="a97b7837101f6c56e476520d10a9f3c3" args="(OGRGeometry *)" -->
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          <td class="memname"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> * OGRGeometryFactory::forceToMultiPoint           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> *&nbsp;</td>
          <td class="paramname"> <em>poGeom</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [static]</code></td>
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Convert to multipoint.<p>
Tries to force the provided geometry to be a multipoint. Currently this just effects a change on points. The passed in geometry is consumed and a new one returned (or potentially the same one).<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>new geometry. </dd></dl>

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<a class="anchor" name="1c00a78cec110d71175726d6f26b1b39"></a><!-- doxytag: member="OGRGeometryFactory::forceToMultiLineString" ref="1c00a78cec110d71175726d6f26b1b39" args="(OGRGeometry *)" -->
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          <td class="memname"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> * OGRGeometryFactory::forceToMultiLineString           </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> *&nbsp;</td>
          <td class="paramname"> <em>poGeom</em>          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [static]</code></td>
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Convert to multilinestring.<p>
Tries to force the provided geometry to be a multilinestring. Currently this just effects a change on linestrings. The passed in geometry is consumed and a new one returned (or potentially the same one).<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>new geometry. </dd></dl>

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<a class="anchor" name="04998dcdbb37aa37871891593c048544"></a><!-- doxytag: member="OGRGeometryFactory::haveGEOS" ref="04998dcdbb37aa37871891593c048544" args="()" -->
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          <td class="memname">int OGRGeometryFactory::haveGEOS           </td>
          <td>(</td>
          <td class="paramname">          </td>
          <td>&nbsp;)&nbsp;</td>
          <td width="100%"><code> [static]</code></td>
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Test if GEOS enabled.<p>
This static method returns TRUE if GEOS support is built into OGR, otherwise it returns FALSE.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>TRUE if available, otherwise FALSE. </dd></dl>

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<hr>The documentation for this class was generated from the following files:<ul>
<li><a class="el" href="ogr__geometry_8h-source.html">ogr_geometry.h</a><li>ogrgeometryfactory.cpp</ul>
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