classogrgeometry.html

gdal库的学习文档

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Returns TRUE if the geometry is simple.<p>
Returns TRUE if the geometry has no anomalous geometric points, such as self intersection or self tangency. The description of each instantiable geometric class will include the specific conditions that cause an instance of that class to be classified as not simple.<p>
This method relates to the SFCOM IGeometry::IsSimple() method.<p>
NOTE: This method is hardcoded to return TRUE at this time.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>TRUE if object is simple, otherwise FALSE. </dd></dl>

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<a class="anchor" name="1702b5b8142abe761061a6cd44e50b05"></a><!-- doxytag: member="OGRGeometry::empty" ref="1702b5b8142abe761061a6cd44e50b05" args="()=0" -->
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          <td class="memname">void OGRGeometry::empty           </td>
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<p>
Clear geometry information. This restores the geometry to it's initial state after construction, and before assignment of actual geometry.<p>
This method relates to the SFCOM IGeometry::Empty() method.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#90cc83b0a3052b8fbe2ed77a86323bf2">OGR_G_Empty()</a>. 
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Implemented in <a class="el" href="classOGRPoint.html#3f4973eec2851ff655b61c600f8bf2f9">OGRPoint</a>, <a class="el" href="classOGRLineString.html#958cec2e062c6372131139be247aecdb">OGRLineString</a>, <a class="el" href="classOGRPolygon.html#8e8ea1eb8916cf60a69650fd3a9025f9">OGRPolygon</a>, and <a class="el" href="classOGRGeometryCollection.html#9aead953ce5cc3076d9d4e4a85c6f68d">OGRGeometryCollection</a>.
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<a class="anchor" name="f2fe60f2bde104cb3eef16475f3f3cd8"></a><!-- doxytag: member="OGRGeometry::clone" ref="f2fe60f2bde104cb3eef16475f3f3cd8" args="() const=0" -->
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          <td class="memname"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> * OGRGeometry::clone           </td>
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<p>
Make a copy of this object.<p>
This method relates to the SFCOM IGeometry::clone() method.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#1725918932da7d59f9ee72829ac171fa">OGR_G_Clone()</a>.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>a new object instance with the same geometry, and spatial reference system as the original. </dd></dl>

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Implemented in <a class="el" href="classOGRPoint.html#f177b24b8fec7b547ded9c0c7636e032">OGRPoint</a>, <a class="el" href="classOGRLineString.html#bda61341d48aff2d374403c1cce69c56">OGRLineString</a>, <a class="el" href="classOGRLinearRing.html#33e70d13f0953a438417714ab8ebb299">OGRLinearRing</a>, <a class="el" href="classOGRPolygon.html#31b267394c89fdd05e2deac7133d8636">OGRPolygon</a>, <a class="el" href="classOGRGeometryCollection.html#cdb672a3c99f6f4136f28b4f53dd1855">OGRGeometryCollection</a>, <a class="el" href="classOGRMultiPolygon.html#cd2ac7a716062f16642ac6040afcc7e9">OGRMultiPolygon</a>, <a class="el" href="classOGRMultiPoint.html#6be07788501b520e48ebc89cccbbc3d0">OGRMultiPoint</a>, and <a class="el" href="classOGRMultiLineString.html#dff0509cc57d7de29eda76da3ba3c1dc">OGRMultiLineString</a>.
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<a class="anchor" name="a3d42b06ae6f7bbef6d1a2886da8d398"></a><!-- doxytag: member="OGRGeometry::getEnvelope" ref="a3d42b06ae6f7bbef6d1a2886da8d398" args="(OGREnvelope *psEnvelope) const =0" -->
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          <td class="memname">void OGRGeometry::getEnvelope           </td>
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          <td class="paramtype"><a class="el" href="classOGREnvelope.html">OGREnvelope</a> *&nbsp;</td>
          <td class="paramname"> <em>psEnvelope</em>          </td>
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<p>
Computes and returns the bounding envelope for this geometry in the passed psEnvelope structure.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#617a9c9ea85157661619a1d8f0a69cf9">OGR_G_GetEnvelope()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>psEnvelope</em>&nbsp;</td><td>the structure in which to place the results. </td></tr>
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Implemented in <a class="el" href="classOGRPoint.html#fde5e07207bccc3e1c5a9170fa03421c">OGRPoint</a>, <a class="el" href="classOGRLineString.html#10e1e99078d31aa7de43b1d930f27fc2">OGRLineString</a>, <a class="el" href="classOGRPolygon.html#4e2a4414af5e8a0bf2901b408d29e345">OGRPolygon</a>, and <a class="el" href="classOGRGeometryCollection.html#bb1251acb05add0bad92b83d1d6906bb">OGRGeometryCollection</a>.
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<a class="anchor" name="68215bd90d675b7627a798b162c54ab1"></a><!-- doxytag: member="OGRGeometry::WkbSize" ref="68215bd90d675b7627a798b162c54ab1" args="() const=0" -->
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          <td class="memname">int OGRGeometry::WkbSize           </td>
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<p>
Returns size of related binary representation.<p>
This method returns the exact number of bytes required to hold the well known binary representation of this geometry object. Its computation may be slightly expensive for complex geometries.<p>
This method relates to the SFCOM IWks::WkbSize() method.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#5f7035a933b957a9d453184c154c237c">OGR_G_WkbSize()</a>.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>size of binary representation in bytes. </dd></dl>

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Implemented in <a class="el" href="classOGRPoint.html#80c0abab7fbc4e871cfdee0617c497aa">OGRPoint</a>, <a class="el" href="classOGRLineString.html#9cd71578349ee3e6fec3d65dc6f17a0e">OGRLineString</a>, <a class="el" href="classOGRLinearRing.html#bbcbb21f4655dab76dbdc40e264695a4">OGRLinearRing</a>, <a class="el" href="classOGRPolygon.html#13e26001d05019fedad787c8e8bc92bc">OGRPolygon</a>, and <a class="el" href="classOGRGeometryCollection.html#5455f464acd7daa54aa592fb493017a6">OGRGeometryCollection</a>.
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<a class="anchor" name="b2c6583c2b7c3e526dcfe54a61470c1f"></a><!-- doxytag: member="OGRGeometry::importFromWkb" ref="b2c6583c2b7c3e526dcfe54a61470c1f" args="(unsigned char *, int=-1)=0" -->
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          <td class="paramtype">unsigned char *&nbsp;</td>
          <td class="paramname"> <em>pabyData</em>, </td>
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          <td class="paramname"> <em>nSize</em> = <code>-1</code></td><td>&nbsp;</td>
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<p>
Assign geometry from well known binary data.<p>
The object must have already been instantiated as the correct derived type of geometry object to match the binaries type. This method is used by the <a class="el" href="classOGRGeometryFactory.html">OGRGeometryFactory</a> class, but not normally called by application code.<p>
This method relates to the SFCOM IWks::ImportFromWKB() method.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#fa5a9173aa3b10a4db09ed696a92ba4a">OGR_G_ImportFromWkb()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>pabyData</em>&nbsp;</td><td>the binary input data. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>nSize</em>&nbsp;</td><td>the size of pabyData in bytes, or zero if not known.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>OGRERR_NONE if all goes well, otherwise any of OGRERR_NOT_ENOUGH_DATA, OGRERR_UNSUPPORTED_GEOMETRY_TYPE, or OGRERR_CORRUPT_DATA may be returned. </dd></dl>

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Implemented in <a class="el" href="classOGRPoint.html#5c5679f8fcc254562e36a8fce316b646">OGRPoint</a>, <a class="el" href="classOGRLineString.html#e594aeb14deec56cf957ce54a9f299a7">OGRLineString</a>, <a class="el" href="classOGRLinearRing.html#80fa5c79e98e92a1b58f30b9904c272c">OGRLinearRing</a>, <a class="el" href="classOGRPolygon.html#46b833f19bf35fcea113233310a245ce">OGRPolygon</a>, and <a class="el" href="classOGRGeometryCollection.html#1f06b21c6ec0a0500eb7e3a815283ccf">OGRGeometryCollection</a>.
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<a class="anchor" name="6fe8947602669a35136e107cd45b084d"></a><!-- doxytag: member="OGRGeometry::exportToWkb" ref="6fe8947602669a35136e107cd45b084d" args="(OGRwkbByteOrder, unsigned char *) const =0" -->
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          <td class="paramname"> <em>eByteOrder</em>, </td>
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<p>
Convert a geometry into well known binary format.<p>
This method relates to the SFCOM IWks::ExportToWKB() method.<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#d5c94ae76c09774dba8725c24daeefd6">OGR_G_ExportToWkb()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>eByteOrder</em>&nbsp;</td><td>One of wkbXDR or wkbNDR indicating MSB or LSB byte order respectively. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pabyData</em>&nbsp;</td><td>a buffer into which the binary representation is written. This buffer must be at least <a class="el" href="classOGRGeometry.html#68215bd90d675b7627a798b162c54ab1">OGRGeometry::WkbSize()</a> byte in size.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>Currently OGRERR_NONE is always returned. </dd></dl>

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Implemented in <a class="el" href="classOGRPoint.html#f3bd24ac1a7305d9a683e208a9065118">OGRPoint</a>, <a class="el" href="classOGRLineString.html#260edbc73c2bd4bde55d759cbc804040">OGRLineString</a>, <a class="el" href="classOGRLinearRing.html#770bb1ca2d82bbba5876923dd2dd3471">OGRLinearRing</a>, <a class="el" href="classOGRPolygon.html#454605f77cb9e17c290272321cac161f">OGRPolygon</a>, and <a class="el" href="classOGRGeometryCollection.html#d3f3dfae1da46c4b0bbdb63abb0c8f5f">OGRGeometryCollection</a>.
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<a class="anchor" name="30561a301d44b1f90393ea4a78a5b0a5"></a><!-- doxytag: member="OGRGeometry::importFromWkt" ref="30561a301d44b1f90393ea4a78a5b0a5" args="(char **ppszInput)=0" -->
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