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<li class="navelem"><a class="el" href="namespacegeos.html">geos</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1operation.html">operation</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1operation_1_1overlayng.html">overlayng</a></li><li class="navelem"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html">OverlayUtil</a></li> </ul>
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<a href="#pub-static-methods">Static Public Member Functions</a> &#124;
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<p><code>#include &lt;<a class="el" href="OverlayUtil_8h_source.html">OverlayUtil.h</a>&gt;</code></p>
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Static Public Member Functions</h2></td></tr>
<tr class="memitem:a6cd09bddbf8868fdb2bda96f9a73fb4f"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a6cd09bddbf8868fdb2bda96f9a73fb4f">isFloating</a> (const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm)</td></tr>
<tr class="separator:a6cd09bddbf8868fdb2bda96f9a73fb4f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:af9d1c355fed3ffe53ade7009a276d74f"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#af9d1c355fed3ffe53ade7009a276d74f">clippingEnvelope</a> (int opCode, const <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1InputGeometry.html">InputGeometry</a> *inputGeom, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm, <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> &amp;rsltEnvelope)</td></tr>
<tr class="separator:af9d1c355fed3ffe53ade7009a276d74f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a6b9e8672e8542dd1ffafe901be0b8219"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a6b9e8672e8542dd1ffafe901be0b8219">isEmptyResult</a> (int opCode, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *a, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *b, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm)</td></tr>
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<tr class="memitem:a98f00f8429b9d82d6ac29df3d35e8a3d"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a98f00f8429b9d82d6ac29df3d35e8a3d">isEnvDisjoint</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *a, const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *b, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm)</td></tr>
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<tr class="memitem:a659ab138517acb2af4756d720010cd7f"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a659ab138517acb2af4756d720010cd7f">createEmptyResult</a> (int dim, const <a class="el" href="classgeos_1_1geom_1_1GeometryFactory.html">GeometryFactory</a> *geomFact)</td></tr>
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<tr class="memitem:a36ac1e4790988baa25bd5e1fd8d811e0"><td class="memItemLeft" align="right" valign="top">static int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a36ac1e4790988baa25bd5e1fd8d811e0">resultDimension</a> (int opCode, int dim0, int dim1)</td></tr>
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<tr class="memitem:a370098885f1d482bf79a40e95ad7a041"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a370098885f1d482bf79a40e95ad7a041">createResultGeometry</a> (std::vector&lt; std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Polygon.html">Polygon</a> &gt;&gt; &amp;resultPolyList, std::vector&lt; std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1LineString.html">LineString</a> &gt;&gt; &amp;resultLineList, std::vector&lt; std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Point.html">Point</a> &gt;&gt; &amp;resultPointList, const <a class="el" href="classgeos_1_1geom_1_1GeometryFactory.html">GeometryFactory</a> *geometryFactory)</td></tr>
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<tr class="memitem:af7edfa7322c78c06af3fd6ac98f19789"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#af7edfa7322c78c06af3fd6ac98f19789">toLines</a> (<a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayGraph.html">OverlayGraph</a> *graph, bool isOutputEdges, const <a class="el" href="classgeos_1_1geom_1_1GeometryFactory.html">GeometryFactory</a> *geomFact)</td></tr>
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<tr class="memitem:a1c5339aa0a9db6635e956c5502c2c5ca"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a1c5339aa0a9db6635e956c5502c2c5ca">round</a> (const <a class="el" href="classgeos_1_1geom_1_1Point.html">Point</a> *pt, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm, <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &amp;rsltCoord)</td></tr>
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<tr class="memitem:afa9884e4ac7847c6e0916d2631581d02"><td class="memTemplParams" colspan="2">template&lt;typename T &gt; </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-static-methods"></a>
Static Private Member Functions</h2></td></tr>
<tr class="memitem:a1e66f0770c4fad5b8eab3c425096289a"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a1e66f0770c4fad5b8eab3c425096289a">resultEnvelope</a> (int opCode, const <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1InputGeometry.html">InputGeometry</a> *inputGeom, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm, <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> &amp;rsltEnvelope)</td></tr>
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<tr class="memitem:a8de3494c8b7e57c210bcd601de8375a5"><td class="memItemLeft" align="right" valign="top">static double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a8de3494c8b7e57c210bcd601de8375a5">safeExpandDistance</a> (const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *env, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm)</td></tr>
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<tr class="memitem:a0821c338e5eaa9071bbfcca64ffd66ba"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a0821c338e5eaa9071bbfcca64ffd66ba">safeEnv</a> (const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *env, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm, <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> &amp;rsltEnvelope)</td></tr>
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<tr class="memitem:aad8dfc37c7a5283cdbec06065e136192"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#aad8dfc37c7a5283cdbec06065e136192">isEmpty</a> (const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *geom)</td></tr>
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<tr class="memitem:ab744fa92e76cdfdf445c5abcebc98486"><td class="memItemLeft" align="right" valign="top">static bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#ab744fa92e76cdfdf445c5abcebc98486">isDisjoint</a> (const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *envA, const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *envB, const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *pm)</td></tr>
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Static Private Attributes</h2></td></tr>
<tr class="memitem:a9043f24415683bc2abf234c9800e0c5a"><td class="memItemLeft" align="right" valign="top">static constexpr double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a9043f24415683bc2abf234c9800e0c5a">SAFE_ENV_BUFFER_FACTOR</a> = 0.1</td></tr>
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<tr class="memitem:a957f182ae818481b94c1adeff51a5276"><td class="memItemLeft" align="right" valign="top">static constexpr int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayUtil.html#a957f182ae818481b94c1adeff51a5276">SAFE_ENV_GRID_FACTOR</a> = 3</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Utility methods for overlay processing.</p>
<dl class="section author"><dt>Author</dt><dd>mdavis </dd></dl>
<p>Definition at line <a class="el" href="OverlayUtil_8h_source.html#l00057">57</a> of file <a class="el" href="OverlayUtil_8h_source.html">OverlayUtil.h</a>.</p>
</div><h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::clippingEnvelope </td>
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<td class="paramtype">int&#160;</td>
<td class="paramname"><em>opCode</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1InputGeometry.html">InputGeometry</a> *&#160;</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *&#160;</td>
<td class="paramname"><em>pm</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> &amp;&#160;</td>
<td class="paramname"><em>rsltEnvelope</em>&#160;</td>
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<p>Computes a clipping envelope for overlay input geometries. The clipping envelope encloses all geometry line segments which might participate in the overlay, with a buffer to account for numerical precision (in particular, rounding due to a precision model. The clipping envelope is used in both the <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html">RingClipper</a> and in the <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1LineLimiter.html">LineLimiter</a>.</p>
<p>Some overlay operations (i.e. UNION and SYMDIFFERENCE cannot use clipping as an optimization, since the result envelope is the full extent of the two input geometries. In this case the returned envelope is null to indicate this. </p>
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<td class="memname">static std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a>&gt; geos::operation::overlayng::OverlayUtil::createEmptyResult </td>
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<p>Creates an empty result geometry of the appropriate dimension, based on the given overlay operation and the dimensions of the inputs. The created geometry is an atomic geometry, not a collection (unless the dimension is -1, in which case a GEOMETRYCOLLECTION EMPTY is created.) </p>
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<td class="memname">static std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a>&gt; geos::operation::overlayng::OverlayUtil::createResultGeometry </td>
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<td class="paramtype">std::vector&lt; std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1Polygon.html">Polygon</a> &gt;&gt; &amp;&#160;</td>
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<td class="paramtype">std::vector&lt; std::unique_ptr&lt; <a class="el" href="classgeos_1_1geom_1_1LineString.html">LineString</a> &gt;&gt; &amp;&#160;</td>
<td class="paramname"><em>resultLineList</em>, </td>
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<p>Creates an overlay result geometry for homogeneous or mixed components. </p>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::isDisjoint </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *&#160;</td>
<td class="paramname"><em>envB</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *&#160;</td>
<td class="paramname"><em>pm</em>&#160;</td>
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<p>Tests for disjoint envelopes adjusting for rounding caused by a fixed precision model. Assumes envelopes are non-empty. </p>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::isEmpty </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *&#160;</td>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::isEmptyResult </td>
<td>(</td>
<td class="paramtype">int&#160;</td>
<td class="paramname"><em>opCode</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a> *&#160;</td>
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<p>Tests if the result can be determined to be empty based on simple properties of the input geometries (such as whether one or both are empty, or their envelopes are disjoint). </p>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::isEnvDisjoint </td>
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<p>Tests if the geometry envelopes are disjoint, or empty. The disjoint test must take into account the precision model being used, since geometry coordinates may shift under rounding. </p>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::isFloating </td>
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<td class="memname">static void geos::operation::overlayng::OverlayUtil::moveGeometry </td>
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<p>Definition at line <a class="el" href="OverlayUtil_8h_source.html#l00168">168</a> of file <a class="el" href="OverlayUtil_8h_source.html">OverlayUtil.h</a>.</p>
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<td class="memname">static int geos::operation::overlayng::OverlayUtil::resultDimension </td>
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<td class="paramtype">int&#160;</td>
<td class="paramname"><em>dim0</em>, </td>
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<p>Computes the dimension of the result of applying the given operation to inputs with the given dimensions. This assumes that complete collapse does not occur.</p>
<p>The result dimension is computed according to the following rules:</p><ul>
<li><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayNG.html#ae377cb489b5244fb00b7042948790f02">OverlayNG::INTERSECTION</a> - result has the dimension of the lowest input dimension</li>
<li><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayNG.html#a2f97adb6ea20a65cf6e0be1a9ae515ea">OverlayNG::UNION</a> - result has the dimension of the highest input dimension</li>
<li><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayNG.html#aa9bbd4b0ce9c18a9e43f23b5c4b6e1cd">OverlayNG::DIFFERENCE</a> - result has the dimension of the left-hand input</li>
<li><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayNG.html#a6e8110f8489231588c03bc60fdff81c2">OverlayNG::SYMDIFFERENCE</a> - result has the dimension of the highest input dimension (since the Symmetric Difference is the Union of the Differences). </li>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::resultEnvelope </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1InputGeometry.html">InputGeometry</a> *&#160;</td>
<td class="paramname"><em>inputGeom</em>, </td>
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<td class="paramname"><em>pm</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> &amp;&#160;</td>
<td class="paramname"><em>rsltEnvelope</em>&#160;</td>
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<p>Computes an envelope which covers the extent of the result of a given overlay operation for given inputs. The operations which have a result envelope smaller than the extent of the inputs are:</p>
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<li>INTERSECTION: result envelope is the intersection of the input envelopes</li>
<li>DIFERENCE: result envelope is the envelope of the A input geometry</li>
</ul>
<p>Otherwise, <code>null</code> is returned to indicate full extent. </p>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::round </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Point.html">Point</a> *&#160;</td>
<td class="paramname"><em>pt</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &amp;&#160;</td>
<td class="paramname"><em>rsltCoord</em>&#160;</td>
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<p>Round the key point if precision model is fixed. Note: return value is only copied if rounding is performed. </p>
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<td class="memname">static bool geos::operation::overlayng::OverlayUtil::safeEnv </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *&#160;</td>
<td class="paramname"><em>env</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *&#160;</td>
<td class="paramname"><em>pm</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> &amp;&#160;</td>
<td class="paramname"><em>rsltEnvelope</em>&#160;</td>
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<td>)</td>
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<td class="memname">static double geos::operation::overlayng::OverlayUtil::safeExpandDistance </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *&#160;</td>
<td class="paramname"><em>env</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">PrecisionModel</a> *&#160;</td>
<td class="paramname"><em>pm</em>&#160;</td>
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<td class="memname">static std::unique_ptr&lt;<a class="el" href="classgeos_1_1geom_1_1Geometry.html">Geometry</a>&gt; geos::operation::overlayng::OverlayUtil::toLines </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayGraph.html">OverlayGraph</a> *&#160;</td>
<td class="paramname"><em>graph</em>, </td>
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<td class="paramname"><em>isOutputEdges</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1GeometryFactory.html">GeometryFactory</a> *&#160;</td>
<td class="paramname"><em>geomFact</em>&#160;</td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">constexpr double geos::operation::overlayng::OverlayUtil::SAFE_ENV_BUFFER_FACTOR = 0.1</td>
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<p>Definition at line <a class="el" href="OverlayUtil_8h_source.html#l00061">61</a> of file <a class="el" href="OverlayUtil_8h_source.html">OverlayUtil.h</a>.</p>
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<td class="memname">constexpr int geos::operation::overlayng::OverlayUtil::SAFE_ENV_GRID_FACTOR = 3</td>
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<p>Definition at line <a class="el" href="OverlayUtil_8h_source.html#l00062">62</a> of file <a class="el" href="OverlayUtil_8h_source.html">OverlayUtil.h</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="OverlayUtil_8h_source.html">OverlayUtil.h</a></li>
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