788 lines
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788 lines
40 KiB
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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_1buffer.html">buffer</a></li><li class="navelem"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a></li> </ul>
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<div class="title">geos::operation::buffer::BufferInputLineSimplifier Class Reference</div> </div>
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<p>Simplifies a buffer input line to remove concavities with shallow depth.
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<a href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>></code></p>
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Collaboration diagram for geos::operation::buffer::BufferInputLineSimplifier:</div>
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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:a6a9404367d2f2d7dc1d68e13e1712a44"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a6a9404367d2f2d7dc1d68e13e1712a44">BufferInputLineSimplifier</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &input)</td></tr>
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<tr class="separator:a6a9404367d2f2d7dc1d68e13e1712a44"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a6e7b2c0914fb8bdeccb6d00101d6696f"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a6e7b2c0914fb8bdeccb6d00101d6696f">simplify</a> (double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a>)</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="pub-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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<tr class="memitem:ada2c76bc6ac435323f5e284288fcc2d9"><td class="memItemLeft" align="right" valign="top">static std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#ada2c76bc6ac435323f5e284288fcc2d9">simplify</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &<a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aaf6f7ce0bf0b4f211a897bdc20b235d4">inputLine</a>, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a>)</td></tr>
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Private Member Functions</h2></td></tr>
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<tr class="memitem:aea7cbb5fc0ba7e06ed3bff4473c583c7"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aea7cbb5fc0ba7e06ed3bff4473c583c7">deleteShallowConcavities</a> ()</td></tr>
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<tr class="memitem:a96022ac3b379ba0bd7a108f5c157e68c"><td class="memItemLeft" align="right" valign="top">size_t </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a96022ac3b379ba0bd7a108f5c157e68c">findNextNonDeletedIndex</a> (size_t index) const </td></tr>
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<tr class="memitem:aded59a0ae46be64f51d680880eae4741"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aded59a0ae46be64f51d680880eae4741">collapseLine</a> () const </td></tr>
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<tr class="memitem:add3a269e3a4cb97817af7a45bf956283"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#add3a269e3a4cb97817af7a45bf956283">isDeletable</a> (size_t i0, size_t i1, size_t i2, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a>) const </td></tr>
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<tr class="memitem:a81edd3537b9c4bcb3dbc1705ff1cf6f1"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a81edd3537b9c4bcb3dbc1705ff1cf6f1">isShallowConcavity</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p1, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p2, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a>) const </td></tr>
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<tr class="memitem:ac21e85973e3dfe69ad81d8355a360182"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#ac21e85973e3dfe69ad81d8355a360182">isShallowSampled</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p2, size_t i0, size_t i2, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a>) const </td></tr>
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<tr class="memitem:ae7539c9c8c4db0fdebae9ab66e3ff6a9"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#ae7539c9c8c4db0fdebae9ab66e3ff6a9">isShallow</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p1, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p2, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a>) const </td></tr>
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<tr class="memitem:a23a556bbf3999f64f79d11c25c140917"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a23a556bbf3999f64f79d11c25c140917">isConcave</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p1, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p2) const </td></tr>
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<tr class="memitem:a20a61bc3e8a0dd35c7d945d16f21a310"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a20a61bc3e8a0dd35c7d945d16f21a310">BufferInputLineSimplifier</a> (const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a> &other)=delete</td></tr>
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<tr class="memitem:ae40ed287739c2226dacad16746587368"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#ae40ed287739c2226dacad16746587368">operator=</a> (const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a> &rhs)=delete</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:aaf6f7ce0bf0b4f211a897bdc20b235d4"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aaf6f7ce0bf0b4f211a897bdc20b235d4">inputLine</a></td></tr>
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<tr class="memitem:aa76ae9ca87ef59bbfc357da6cf6e25c1"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#aa76ae9ca87ef59bbfc357da6cf6e25c1">distanceTol</a></td></tr>
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<tr class="memitem:ab1edd3597c5f1bc9614e1855d94651e1"><td class="memItemLeft" align="right" valign="top">std::vector< int > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#ab1edd3597c5f1bc9614e1855d94651e1">isDeleted</a></td></tr>
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<tr class="memitem:af50047c8a474abb5706d85bde7be7559"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#af50047c8a474abb5706d85bde7be7559">angleOrientation</a></td></tr>
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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:a6fe6cad37e2cc92983e58ed0f0c2ab9d"><td class="memItemLeft" align="right" valign="top">static const int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a6fe6cad37e2cc92983e58ed0f0c2ab9d">NUM_PTS_TO_CHECK</a> = 10</td></tr>
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<tr class="memitem:abcbc5ae786a1dba26db99f920baa10f0"><td class="memItemLeft" align="right" valign="top">static const int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#abcbc5ae786a1dba26db99f920baa10f0">INIT</a> = 0</td></tr>
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<tr class="memitem:a8f59ad1d58ac54dd8b6fbddcab2c5bed"><td class="memItemLeft" align="right" valign="top">static const int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a8f59ad1d58ac54dd8b6fbddcab2c5bed">DELETE</a> = 1</td></tr>
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<tr class="memitem:a08323e3ea4bfe2be9550039a04fadb25"><td class="memItemLeft" align="right" valign="top">static const int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html#a08323e3ea4bfe2be9550039a04fadb25">KEEP</a> = 1</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>Simplifies a buffer input line to remove concavities with shallow depth. </p>
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<p>The most important benefit of doing this is to reduce the number of points and the complexity of shape which will be buffered. It also reduces the risk of gores created by the quantized fillet arcs (although this issue should be eliminated in any case by the offset curve generation logic).</p>
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<p>A key aspect of the simplification is that it affects inside (concave or inward) corners only. Convex (outward) corners are preserved, since they are required to ensure that the generated buffer curve lies at the correct distance from the input geometry.</p>
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<p>Another important heuristic used is that the end segments of the input are never simplified. This ensures that the client buffer code is able to generate end caps faithfully.</p>
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<p>No attempt is made to avoid self-intersections in the output. This is acceptable for use for generating a buffer offset curve, since the buffer algorithm is insensitive to invalid polygonal geometry. However, this means that this algorithm cannot be used as a general-purpose polygon simplification technique.</p>
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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="BufferInputLineSimplifier_8h_source.html#l00072">72</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::operation::buffer::BufferInputLineSimplifier::BufferInputLineSimplifier </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">geom::CoordinateSequence</a> & </td>
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<td class="paramname"><em>input</em></td><td>)</td>
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<td class="memname">geos::operation::buffer::BufferInputLineSimplifier::BufferInputLineSimplifier </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a> & </td>
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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_1CoordinateSequence.html">geom::CoordinateSequence</a>> geos::operation::buffer::BufferInputLineSimplifier::collapseLine </td>
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<td>(</td>
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<td> const</td>
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<span class="mlabels"><span class="mlabel">private</span></span> </td>
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<td class="memname">bool geos::operation::buffer::BufferInputLineSimplifier::deleteShallowConcavities </td>
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<td>(</td>
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<p>Uses a sliding window containing 3 vertices to detect shallow angles in which the middle vertex can be deleted, since it does not affect the shape of the resulting buffer in a significant way. </p><dl class="section return"><dt>Returns</dt><dd></dd></dl>
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<td class="memname">size_t geos::operation::buffer::BufferInputLineSimplifier::findNextNonDeletedIndex </td>
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<td>(</td>
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<td class="paramtype">size_t </td>
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<td class="paramname"><em>index</em></td><td>)</td>
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<p>Finds the next non-deleted index, or the end of the point array if none</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">index</td><td></td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the next non-deleted index, if any </dd>
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inputLine.size() if there are no more non-deleted indices </dd></dl>
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<td class="memname">bool geos::operation::buffer::BufferInputLineSimplifier::isConcave </td>
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<td>(</td>
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<td class="paramtype">size_t </td>
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<td class="memname">bool geos::operation::buffer::BufferInputLineSimplifier::isShallow </td>
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<td>(</td>
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<p>Checks for shallowness over a sample of points in the given section.</p>
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<p>This helps prevents the siplification from incrementally "skipping" over points which are in fact non-shallow.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p0</td><td>start coordinate of section </td></tr>
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<tr><td class="paramname">i0</td><td>start index of section </td></tr>
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<tr><td class="paramname">i2</td><td>end index of section </td></tr>
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<td class="memname"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a>& geos::operation::buffer::BufferInputLineSimplifier::operator= </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferInputLineSimplifier.html">BufferInputLineSimplifier</a> & </td>
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<td class="paramname"><em>rhs</em></td><td>)</td>
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<td class="memname">static std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a>> geos::operation::buffer::BufferInputLineSimplifier::simplify </td>
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<p>Simplify the input coordinate list.</p>
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<p>If the distance tolerance is positive, concavities on the LEFT side of the line are simplified. If the supplied distance tolerance is negative, concavities on the RIGHT side of the line are simplified.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<dl class="section return"><dt>Returns</dt><dd>a simplified version of the coordinate sequence </dd></dl>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a>> geos::operation::buffer::BufferInputLineSimplifier::simplify </td>
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<td>(</td>
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<p>Simplify the input coordinate list. If the distance tolerance is positive, concavities on the LEFT side of the line are simplified. If the supplied distance tolerance is negative, concavities on the RIGHT side of the line are simplified.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">distanceTol</td><td>simplification distance tolerance to use </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the simplified coordinate list </dd></dl>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">int geos::operation::buffer::BufferInputLineSimplifier::angleOrientation</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00170">170</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">const int geos::operation::buffer::BufferInputLineSimplifier::DELETE = 1</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00163">163</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">double geos::operation::buffer::BufferInputLineSimplifier::distanceTol</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00167">167</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">const int geos::operation::buffer::BufferInputLineSimplifier::INIT = 0</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00162">162</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a>& geos::operation::buffer::BufferInputLineSimplifier::inputLine</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00166">166</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">std::vector<int> geos::operation::buffer::BufferInputLineSimplifier::isDeleted</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00168">168</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">const int geos::operation::buffer::BufferInputLineSimplifier::KEEP = 1</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00164">164</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a>.</p>
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<td class="memname">const int geos::operation::buffer::BufferInputLineSimplifier::NUM_PTS_TO_CHECK = 10</td>
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<p>Definition at line <a class="el" href="BufferInputLineSimplifier_8h_source.html#l00160">160</a> of file <a class="el" href="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.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="BufferInputLineSimplifier_8h_source.html">BufferInputLineSimplifier.h</a></li>
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