735 lines
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735 lines
38 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_1OffsetCurveBuilder.html">OffsetCurveBuilder</a></li> </ul>
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<div class="title">geos::operation::buffer::OffsetCurveBuilder Class Reference</div> </div>
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<p>Computes the raw offset curve for a single Geometry component (ring, line or point).
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<a href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a>></code></p>
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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:a6768edebb91467bf4e5fc23f6ae3cd4a"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a6768edebb91467bf4e5fc23f6ae3cd4a">OffsetCurveBuilder</a> (const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">geom::PrecisionModel</a> *newPrecisionModel, const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferParameters.html">BufferParameters</a> &nBufParams)</td></tr>
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<tr class="separator:a6768edebb91467bf4e5fc23f6ae3cd4a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a8ecb15cf01c558c70f12023289a46f46"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferParameters.html">BufferParameters</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a8ecb15cf01c558c70f12023289a46f46">getBufferParameters</a> () const </td></tr>
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<tr class="memdesc:a8ecb15cf01c558c70f12023289a46f46"><td class="mdescLeft"> </td><td class="mdescRight">Gets the buffer parameters being used to generate the curve. <a href="#a8ecb15cf01c558c70f12023289a46f46">More...</a><br /></td></tr>
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<tr class="separator:a8ecb15cf01c558c70f12023289a46f46"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7bec44c7279de815b2e50e5aa5f885ff"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a7bec44c7279de815b2e50e5aa5f885ff">isLineOffsetEmpty</a> (double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a7ea453d850f1d3fc8ac56520eefbb91a">distance</a>)</td></tr>
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<tr class="separator:a7bec44c7279de815b2e50e5aa5f885ff"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5e4cc3b46211b1b8f17e1fe41bdb7760"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a5e4cc3b46211b1b8f17e1fe41bdb7760">getLineCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *inputPts, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a7ea453d850f1d3fc8ac56520eefbb91a">distance</a>, std::vector< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> * > &lineList)</td></tr>
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<tr class="memdesc:a5e4cc3b46211b1b8f17e1fe41bdb7760"><td class="mdescLeft"> </td><td class="mdescRight">This method handles single points as well as lines. <a href="#a5e4cc3b46211b1b8f17e1fe41bdb7760">More...</a><br /></td></tr>
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<tr class="separator:a5e4cc3b46211b1b8f17e1fe41bdb7760"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aaf73691f2640a2f530803690f9edf361"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#aaf73691f2640a2f530803690f9edf361">getSingleSidedLineCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *inputPts, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a7ea453d850f1d3fc8ac56520eefbb91a">distance</a>, std::vector< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> * > &lineList, bool leftSide, bool rightSide)</td></tr>
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<tr class="memdesc:aaf73691f2640a2f530803690f9edf361"><td class="mdescLeft"> </td><td class="mdescRight">This method handles single points as well as lines. <a href="#aaf73691f2640a2f530803690f9edf361">More...</a><br /></td></tr>
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<tr class="memitem:a6e6b3d556509d004890a4b6e8bc2da8b"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a6e6b3d556509d004890a4b6e8bc2da8b">getRingCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> *inputPts, int side, double <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a7ea453d850f1d3fc8ac56520eefbb91a">distance</a>, std::vector< <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> * > &lineList)</td></tr>
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<tr class="memdesc:a6e6b3d556509d004890a4b6e8bc2da8b"><td class="mdescLeft"> </td><td class="mdescRight">This method handles the degenerate cases of single points and lines, as well as rings. <a href="#a6e6b3d556509d004890a4b6e8bc2da8b">More...</a><br /></td></tr>
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Private Member Functions</h2></td></tr>
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<tr class="memitem:a8552251cb74e9c229a4de7935f8ea12d"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a8552251cb74e9c229a4de7935f8ea12d">simplifyTolerance</a> (double bufDistance)</td></tr>
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<tr class="memdesc:a8552251cb74e9c229a4de7935f8ea12d"><td class="mdescLeft"> </td><td class="mdescRight">Computes the distance tolerance to use during input line simplification. <a href="#a8552251cb74e9c229a4de7935f8ea12d">More...</a><br /></td></tr>
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<tr class="memitem:ad6a186c964f05d6dfa4d1eb7fc13188d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#ad6a186c964f05d6dfa4d1eb7fc13188d">computeLineBufferCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &inputPts, <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a> &segGen)</td></tr>
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<tr class="memitem:aeced929620ce1e24357a25ef96810204"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#aeced929620ce1e24357a25ef96810204">computeSingleSidedBufferCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &inputPts, bool isRightSide, <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a> &segGen)</td></tr>
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<tr class="memitem:a9abb960e1197212c9e0a08a4b7d7cf0a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a9abb960e1197212c9e0a08a4b7d7cf0a">computeRingBufferCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1CoordinateSequence.html">geom::CoordinateSequence</a> &inputPts, int side, <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a> &segGen)</td></tr>
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<tr class="memitem:a4741ce3edb4bbefeb53fbb84c18f4aca"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a4741ce3edb4bbefeb53fbb84c18f4aca">getSegGen</a> (double dist)</td></tr>
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<tr class="memitem:acc048ad97b74194ac054e5a2e4546879"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#acc048ad97b74194ac054e5a2e4546879">computePointCurve</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &pt, <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a> &segGen)</td></tr>
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<tr class="memitem:af6942988fbcaf8490a912a36488e8f55"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#af6942988fbcaf8490a912a36488e8f55">OffsetCurveBuilder</a> (const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html">OffsetCurveBuilder</a> &other)=delete</td></tr>
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<tr class="memitem:aa2997c05f93f6e29c2518bbc169678eb"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html">OffsetCurveBuilder</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#aa2997c05f93f6e29c2518bbc169678eb">operator=</a> (const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html">OffsetCurveBuilder</a> &rhs)=delete</td></tr>
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Private Attributes</h2></td></tr>
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<tr class="memitem:a7ea453d850f1d3fc8ac56520eefbb91a"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a7ea453d850f1d3fc8ac56520eefbb91a">distance</a></td></tr>
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<tr class="memitem:a6e28540b575f1bc2e0f2cb8e120d65ed"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">geom::PrecisionModel</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a6e28540b575f1bc2e0f2cb8e120d65ed">precisionModel</a></td></tr>
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<tr class="memitem:aca488cbba72f8229967066118cb43376"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferParameters.html">BufferParameters</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#aca488cbba72f8229967066118cb43376">bufParams</a></td></tr>
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Static Private Attributes</h2></td></tr>
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<tr class="memitem:a5216918fde1859699afa138e423657d0"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html#a5216918fde1859699afa138e423657d0">SIMPLIFY_FACTOR</a></td></tr>
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<tr class="memdesc:a5216918fde1859699afa138e423657d0"><td class="mdescLeft"> </td><td class="mdescRight">Use a value which results in a potential distance error which is significantly less than the error due to the quadrant segment discretization. <a href="#a5216918fde1859699afa138e423657d0">More...</a><br /></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>Computes the raw offset curve for a single Geometry component (ring, line or point). </p>
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<p>A raw offset curve line is not noded - it may contain self-intersections (and usually will). The final buffer polygon is computed by forming a topological graph of all the noded raw curves and tracing outside contours. The points in the raw curve are rounded to a given <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html" title="Specifies the precision model of the Coordinate in a Geometry. ">geom::PrecisionModel</a>. </p>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00062">62</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.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::OffsetCurveBuilder::OffsetCurveBuilder </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">geom::PrecisionModel</a> * </td>
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<td class="paramname"><em>newPrecisionModel</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferParameters.html">BufferParameters</a> & </td>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00072">72</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a>.</p>
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<td class="memname">geos::operation::buffer::OffsetCurveBuilder::OffsetCurveBuilder </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_1OffsetCurveBuilder.html">OffsetCurveBuilder</a> & </td>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::computeLineBufferCurve </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="paramtype"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a> & </td>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::computePointCurve </td>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::computeRingBufferCurve </td>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::computeSingleSidedBufferCurve </td>
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<td class="memname">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferParameters.html">BufferParameters</a>& geos::operation::buffer::OffsetCurveBuilder::getBufferParameters </td>
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<p>Gets the buffer parameters being used to generate the curve. </p>
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<dl class="section return"><dt>Returns</dt><dd>the buffer parameters being used </dd></dl>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00086">86</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a>.</p>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::getLineCurve </td>
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<p>This method handles single points as well as lines. </p>
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<p>Lines are assumed to <b>not</b> be closed (the function will not fail for closed lines, but will generate superfluous line caps).</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::getRingCurve </td>
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<td>(</td>
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<p>This method handles the degenerate cases of single points and lines, as well as rings. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">inputPts</td><td>input points </td></tr>
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<tr><td class="paramname">side</td><td>a <a class="el" href="classgeos_1_1geom_1_1Position.html">Position</a> </td></tr>
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<tr><td class="paramname">distance</td><td>offset distance </td></tr>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetSegmentGenerator.html">OffsetSegmentGenerator</a>> geos::operation::buffer::OffsetCurveBuilder::getSegGen </td>
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<td class="memname">void geos::operation::buffer::OffsetCurveBuilder::getSingleSidedLineCurve </td>
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<p>This method handles single points as well as lines. </p>
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<p>Lines are assumed to <b>not</b> be closed (the function will not fail for closed lines, but will generate superfluous line caps).</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">inputPts</td><td>input points </td></tr>
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<tr><td class="paramname">distance</td><td>offset distance </td></tr>
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<tr><td class="paramname">lineList</td><td>the std::vector to which newly created CoordinateSequences will be pushed_back. Caller will be responsible to delete them. </td></tr>
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<tr><td class="paramname">leftSide</td><td>indicates that the left side buffer will be obtained/skipped </td></tr>
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<dl class="section note"><dt>Note</dt><dd>This is a GEOS extension. </dd></dl>
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<p>Tests whether the offset curve for line or point geometries at the given offset distance is empty (does not exist). This is the case if: </p><ul>
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<li>
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<dl class="section return"><dt>Returns</dt><dd>true if the offset curve is empty </dd></dl>
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<td class="memname"><a class="el" href="classgeos_1_1operation_1_1buffer_1_1OffsetCurveBuilder.html">OffsetCurveBuilder</a>& geos::operation::buffer::OffsetCurveBuilder::operator= </td>
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<td>(</td>
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<td class="paramname"><em>rhs</em></td><td>)</td>
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<td class="memname">double geos::operation::buffer::OffsetCurveBuilder::simplifyTolerance </td>
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<td>(</td>
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<p>Computes the distance tolerance to use during input line simplification. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<dl class="section return"><dt>Returns</dt><dd>the simplification tolerance </dd></dl>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">const <a class="el" href="classgeos_1_1operation_1_1buffer_1_1BufferParameters.html">BufferParameters</a>& geos::operation::buffer::OffsetCurveBuilder::bufParams</td>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00163">163</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a>.</p>
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<td class="memname">double geos::operation::buffer::OffsetCurveBuilder::distance</td>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00159">159</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">geom::PrecisionModel</a>* geos::operation::buffer::OffsetCurveBuilder::precisionModel</td>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00161">161</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a>.</p>
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<td class="memname">const double geos::operation::buffer::OffsetCurveBuilder::SIMPLIFY_FACTOR</td>
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<p>Use a value which results in a potential distance error which is significantly less than the error due to the quadrant segment discretization. </p>
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<p>For QS = 8 a value of 100 is reasonable. This should produce a maximum of 1% distance error. </p>
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<p>Definition at line <a class="el" href="OffsetCurveBuilder_8h_source.html#l00172">172</a> of file <a class="el" href="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.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="OffsetCurveBuilder_8h_source.html">OffsetCurveBuilder.h</a></li>
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