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552 lines
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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_1RingClipper.html">RingClipper</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">geos::operation::overlayng::RingClipper Class Reference</div> </div>
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<p><code>#include <<a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a0bad8437d15d9c8c7c02bcf89b4b4444"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a0bad8437d15d9c8c7c02bcf89b4b4444">RingClipper</a> (const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> *env)</td></tr>
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<tr class="separator:a0bad8437d15d9c8c7c02bcf89b4b4444"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8981e421aefce91857e8580c13a1e904"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1CoordinateArraySequence.html">CoordinateArraySequence</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a8981e421aefce91857e8580c13a1e904">clip</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">CoordinateSequence</a> *cs) const </td></tr>
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<tr class="separator:a8981e421aefce91857e8580c13a1e904"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-methods"></a>
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Private Member Functions</h2></td></tr>
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<tr class="memitem:a295fc9c70300228566ecb2946bd54ac8"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1CoordinateArraySequence.html">CoordinateArraySequence</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a295fc9c70300228566ecb2946bd54ac8">clipToBoxEdge</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">CoordinateSequence</a> *pts, int edgeIndex, bool closeRing) const </td></tr>
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<tr class="separator:a295fc9c70300228566ecb2946bd54ac8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5e6edde2e30d4aa5d985f188d696fd41"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a5e6edde2e30d4aa5d985f188d696fd41">intersection</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &a, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &b, int edgeIndex, <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &rsltPt) const </td></tr>
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<tr class="separator:a5e6edde2e30d4aa5d985f188d696fd41"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a14464262565c05e33ebe9746e1c5f036"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a14464262565c05e33ebe9746e1c5f036">intersectionLineY</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &a, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &b, double y) const </td></tr>
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<tr class="memitem:a424cd48ac689097f5a0d9837f1fdc56a"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a424cd48ac689097f5a0d9837f1fdc56a">intersectionLineX</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &a, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &b, double x) const </td></tr>
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<tr class="memitem:ad704c1ff910af6d38514bc7493c1eeab"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#ad704c1ff910af6d38514bc7493c1eeab">isInsideEdge</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> &p, int edgeIndex) const </td></tr>
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<tr class="separator:ad704c1ff910af6d38514bc7493c1eeab"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-attribs"></a>
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Private Attributes</h2></td></tr>
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<tr class="memitem:ae3b2857f66830248dd4575df42c74f57"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#ae3b2857f66830248dd4575df42c74f57">clipEnvMinY</a></td></tr>
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<tr class="memitem:aa1f2c3f7c123c180a65d52e9c7d5357a"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#aa1f2c3f7c123c180a65d52e9c7d5357a">clipEnvMaxY</a></td></tr>
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<tr class="memitem:a25671b6bcbdba731dc64241dd893db2e"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a25671b6bcbdba731dc64241dd893db2e">clipEnvMinX</a></td></tr>
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<tr class="memitem:a508b54307a27d5cfe8f7e2b8792ec165"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a508b54307a27d5cfe8f7e2b8792ec165">clipEnvMaxX</a></td></tr>
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<tr class="separator:a508b54307a27d5cfe8f7e2b8792ec165"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pri-static-attribs"></a>
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Static Private Attributes</h2></td></tr>
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<tr class="memitem:a57067ac68b806c214646765c15aa98f1"><td class="memItemLeft" align="right" valign="top">static constexpr int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a57067ac68b806c214646765c15aa98f1">BOX_LEFT</a> = 3</td></tr>
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<tr class="memitem:a7ca8e6cdbf9fd2289a571f90b35bf22e"><td class="memItemLeft" align="right" valign="top">static constexpr int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#a7ca8e6cdbf9fd2289a571f90b35bf22e">BOX_TOP</a> = 2</td></tr>
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<tr class="memitem:aaf3c16fe39c0b909fd583013ccb92032"><td class="memItemLeft" align="right" valign="top">static constexpr int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#aaf3c16fe39c0b909fd583013ccb92032">BOX_RIGHT</a> = 1</td></tr>
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<tr class="memitem:aaddb15cdea09e408de3e215db0d77721"><td class="memItemLeft" align="right" valign="top">static constexpr int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RingClipper.html#aaddb15cdea09e408de3e215db0d77721">BOX_BOTTOM</a> = 0</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Clips rings of points to a rectangle. Uses a variant of Cohen-Sutherland clipping.</p>
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<p>In general the output is not topologically valid. In particular, the output may contain coincident non-noded line segments along the clip rectangle sides. However, the output is sufficiently well-structured that it can be used as input to the <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1OverlayNG.html">OverlayNG</a> algorithm (which is able to process coincident linework due to the need to handle topology collapse under precision reduction).</p>
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<p>Because of the likelihood of creating extraneous line segments along the clipping rectangle sides, this class is not suitable for clipping linestrings.</p>
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<p>The clipping envelope should be generated using <a class="el" href="classgeos_1_1operation_1_1overlayng_1_1RobustClipEnvelopeComputer.html">RobustClipEnvelopeComputer</a>, to ensure that intersecting line segments are not perturbed by clipping. This is required to ensure that the overlay of the clipped geometry is robust and correct (i.e. the same as if clipping was not used).</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="classgeos_1_1operation_1_1overlayng_1_1LineLimiter.html">LineLimiter</a></dd></dl>
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<dl class="section author"><dt>Author</dt><dd>Martin Davis </dd></dl>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00066">66</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::operation::overlayng::RingClipper::RingClipper </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Envelope.html">Envelope</a> * </td>
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<td class="paramname"><em>env</em></td><td>)</td>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00103">103</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1CoordinateArraySequence.html">CoordinateArraySequence</a>> geos::operation::overlayng::RingClipper::clip </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">CoordinateSequence</a> * </td>
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<td class="paramname"><em>cs</em></td><td>)</td>
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<td> const</td>
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<p>Clips a list of points to the clipping rectangle box. </p>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1CoordinateArraySequence.html">CoordinateArraySequence</a>> geos::operation::overlayng::RingClipper::clipToBoxEdge </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">CoordinateSequence</a> * </td>
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<td class="paramname"><em>pts</em>, </td>
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<td class="paramtype">int </td>
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<p>Clips line to the axis-parallel line defined by a single box edge. </p>
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<td class="memname">void geos::operation::overlayng::RingClipper::intersection </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> & </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1Coordinate.html">Coordinate</a> & </td>
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<td class="paramname"><em>rsltPt</em> </td>
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<p>Computes the intersection point of a segment with an edge of the clip box. The segment must be known to intersect the edge. </p>
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<td class="memname">double geos::operation::overlayng::RingClipper::intersectionLineX </td>
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<td class="memname">double geos::operation::overlayng::RingClipper::intersectionLineY </td>
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<td class="memname">bool geos::operation::overlayng::RingClipper::isInsideEdge </td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">constexpr int geos::operation::overlayng::RingClipper::BOX_BOTTOM = 0</td>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00074">74</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00071">71</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00073">73</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00072">72</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00081">81</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00079">79</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00080">80</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<p>Definition at line <a class="el" href="RingClipper_8h_source.html#l00078">78</a> of file <a class="el" href="RingClipper_8h_source.html">RingClipper.h</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="RingClipper_8h_source.html">RingClipper.h</a></li>
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