classogrpolygon.html

gdal库的学习文档

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Get the dimension of this object.<p>
This method corresponds to the SFCOM IGeometry::GetDimension() method. It indicates the dimension of the object, but does not indicate the dimension of the underlying space (as indicated by <a class="el" href="classOGRGeometry.html#4a6fdd4df7c043558b5428d8f1c35b16">OGRGeometry::getCoordinateDimension()</a>).<p>
This method is the same as the C function <a class="el" href="ogr__api_8h.html#94b633e1acd208c258ad49f8d4fd4104">OGR_G_GetDimension()</a>.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>0 for points, 1 for lines and 2 for surfaces. </dd></dl>

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Implements <a class="el" href="classOGRGeometry.html#266c427f00ea35fdc503393c210a115d">OGRGeometry</a>.
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<a class="anchor" name="4e2a4414af5e8a0bf2901b408d29e345"></a><!-- doxytag: member="OGRPolygon::getEnvelope" ref="4e2a4414af5e8a0bf2901b408d29e345" args="(OGREnvelope *psEnvelope) const" -->
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          <td class="memname">void OGRPolygon::getEnvelope           </td>
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          <td class="paramname"> <em>psEnvelope</em>          </td>
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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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Implements <a class="el" href="classOGRGeometry.html#a3d42b06ae6f7bbef6d1a2886da8d398">OGRGeometry</a>.
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<a class="anchor" name="5daaf7cbfb1263a4b9fc126f5c51cf37"></a><!-- doxytag: member="OGRPolygon::Equals" ref="5daaf7cbfb1263a4b9fc126f5c51cf37" args="(OGRGeometry *) const " -->
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          <td class="memname">OGRBoolean OGRPolygon::Equals           </td>
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          <td class="paramtype"><a class="el" href="classOGRGeometry.html">OGRGeometry</a> *&nbsp;</td>
          <td class="paramname"> <em>poOther</em>          </td>
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Returns two if two geometries are equivalent.<p>
This method is the same as the C function OGR_G_Equal().<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>TRUE if equivalent or FALSE otherwise. </dd></dl>

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Implements <a class="el" href="classOGRGeometry.html#e751513a46c7e7b154796bfe494faf16">OGRGeometry</a>.
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<a class="anchor" name="ae4be814a04641d5ad9f8c79e00b3c35"></a><!-- doxytag: member="OGRPolygon::setCoordinateDimension" ref="ae4be814a04641d5ad9f8c79e00b3c35" args="(int nDimension)" -->
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          <td class="memname">void OGRPolygon::setCoordinateDimension           </td>
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          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>nDimension</em>          </td>
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Set the coordinate dimension.<p>
This method sets the explicit coordinate dimension. Setting the coordinate dimension of a geometry to 2 should zero out any existing Z values. Setting the dimension of a geometry collection will not necessarily affect the children geometries.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>nNewDimension</em>&nbsp;</td><td>New coordinate dimension value, either 2 or 3. </td></tr>
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Reimplemented from <a class="el" href="classOGRGeometry.html#79f84a2b948d511f28c47c47577dea49">OGRGeometry</a>.
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<a class="anchor" name="6a2400d013a7538169b6f610499d9e30"></a><!-- doxytag: member="OGRPolygon::addRing" ref="6a2400d013a7538169b6f610499d9e30" args="(OGRLinearRing *)" -->
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          <td class="memname">void OGRPolygon::addRing           </td>
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          <td class="paramtype"><a class="el" href="classOGRLinearRing.html">OGRLinearRing</a> *&nbsp;</td>
          <td class="paramname"> <em>poNewRing</em>          </td>
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<p>
Add a ring to a polygon.<p>
If the polygon has no external ring (it is empty) this will be used as the external ring, otherwise it is used as an internal ring. The passed <a class="el" href="classOGRLinearRing.html">OGRLinearRing</a> remains the responsibility of the caller (an internal copy is made).<p>
This method has no SFCOM analog.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td valign="top"></td><td valign="top"><em>poNewRing</em>&nbsp;</td><td>ring to be added to the polygon. </td></tr>
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<a class="anchor" name="17f7fca852efca8155fba7cbad7572c0"></a><!-- doxytag: member="OGRPolygon::addRingDirectly" ref="17f7fca852efca8155fba7cbad7572c0" args="(OGRLinearRing *)" -->
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          <td class="memname">void OGRPolygon::addRingDirectly           </td>
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          <td class="paramtype"><a class="el" href="classOGRLinearRing.html">OGRLinearRing</a> *&nbsp;</td>
          <td class="paramname"> <em>poNewRing</em>          </td>
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<p>
Add a ring to a polygon.<p>
If the polygon has no external ring (it is empty) this will be used as the external ring, otherwise it is used as an internal ring. Ownership of the passed ring is assumed by the <a class="el" href="classOGRPolygon.html">OGRPolygon</a>, but otherwise this method operates the same as OGRPolygon::AddRing().<p>
This method has no SFCOM analog.<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>poNewRing</em>&nbsp;</td><td>ring to be added to the polygon. </td></tr>
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<a class="anchor" name="d4ba927fb74871bf029e6a3efec3586c"></a><!-- doxytag: member="OGRPolygon::getExteriorRing" ref="d4ba927fb74871bf029e6a3efec3586c" args="()" -->
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          <td class="memname"><a class="el" href="classOGRLinearRing.html">OGRLinearRing</a> * OGRPolygon::getExteriorRing           </td>
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Fetch reference to external polygon ring.<p>
Note that the returned ring pointer is to an internal data object of the <a class="el" href="classOGRPolygon.html">OGRPolygon</a>. It should not be modified or deleted by the application, and the pointer is only valid till the polygon is next modified. Use the <a class="el" href="classOGRGeometry.html#f2fe60f2bde104cb3eef16475f3f3cd8">OGRGeometry::clone()</a> method to make a separate copy within the application.<p>
Relates to the SFCOM IPolygon::get_ExteriorRing() method.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>pointer to external ring. May be NULL if the <a class="el" href="classOGRPolygon.html">OGRPolygon</a> is empty. </dd></dl>

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<a class="anchor" name="a2299b4634f5c1d5468475ec5ab8ce12"></a><!-- doxytag: member="OGRPolygon::getNumInteriorRings" ref="a2299b4634f5c1d5468475ec5ab8ce12" args="() const" -->
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          <td class="memname">int OGRPolygon::getNumInteriorRings           </td>
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<p>
Fetch the number of internal rings.<p>
Relates to the SFCOM IPolygon::get_NumInteriorRings() method.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>count of internal rings, zero or more. </dd></dl>

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<a class="anchor" name="f0bf0b1d1104e142b47637659518ad9c"></a><!-- doxytag: member="OGRPolygon::getInteriorRing" ref="f0bf0b1d1104e142b47637659518ad9c" args="(int)" -->
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          <td class="memname"><a class="el" href="classOGRLinearRing.html">OGRLinearRing</a> * OGRPolygon::getInteriorRing           </td>
          <td>(</td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>iRing</em>          </td>
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<p>
Fetch reference to indicated internal ring.<p>
Note that the returned ring pointer is to an internal data object of the <a class="el" href="classOGRPolygon.html">OGRPolygon</a>. It should not be modified or deleted by the application, and the pointer is only valid till the polygon is next modified. Use the <a class="el" href="classOGRGeometry.html#f2fe60f2bde104cb3eef16475f3f3cd8">OGRGeometry::clone()</a> method to make a separate copy within the application.<p>
Relates to the SFCOM IPolygon::get_InternalRing() method.<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>iRing</em>&nbsp;</td><td>internal ring index from 0 to getNumInternalRings() - 1.</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>pointer to external ring. May be NULL if the <a class="el" href="classOGRPolygon.html">OGRPolygon</a> is empty. </dd></dl>

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<a class="anchor" name="f5f15a5673fde9522b4e70abdb9cec93"></a><!-- doxytag: member="OGRPolygon::closeRings" ref="f5f15a5673fde9522b4e70abdb9cec93" args="()" -->
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          <td class="memname">void OGRPolygon::closeRings           </td>
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<p>
Force rings to be closed.<p>
If this geometry, or any contained geometries has polygon rings that are not closed, they will be closed by adding the starting point at the end. 
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Reimplemented from <a class="el" href="classOGRGeometry.html#eb6cf249316b3046e0d4f77ec400e844">OGRGeometry</a>.
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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>ogrpolygon.cpp</ul>
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