630 lines
35 KiB
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630 lines
35 KiB
HTML
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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_1noding.html">noding</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1noding_1_1snapround.html">snapround</a></li><li class="navelem"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html">SnapRoundingNoder</a></li> </ul>
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<div class="title">geos::noding::snapround::SnapRoundingNoder Class Reference</div> </div>
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<div class="contents">
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<p><code>#include <<a class="el" href="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.h</a>></code></p>
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<div class="dynheader">
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Inheritance diagram for geos::noding::snapround::SnapRoundingNoder:</div>
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Collaboration diagram for geos::noding::snapround::SnapRoundingNoder:</div>
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<div class="center"><div class="zoom"><iframe scrolling="no" frameborder="0" src="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder__coll__graph.svg" width="100%" height="429"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></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:a66a32128fa4817ab6b620902389ff0ab"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a66a32128fa4817ab6b620902389ff0ab">SnapRoundingNoder</a> (const <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">geom::PrecisionModel</a> *p_pm)</td></tr>
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<tr class="separator:a66a32128fa4817ab6b620902389ff0ab"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a038c20c192b0691d34e688e4a251ca53"><td class="memItemLeft" align="right" valign="top">std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a038c20c192b0691d34e688e4a251ca53">getNodedSubstrings</a> () const override</td></tr>
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<tr class="separator:a038c20c192b0691d34e688e4a251ca53"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a875a2e57455ca5efc3b7b6cae617d03a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a875a2e57455ca5efc3b7b6cae617d03a">computeNodes</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > *inputSegStrings) override</td></tr>
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<tr class="separator:a875a2e57455ca5efc3b7b6cae617d03a"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="inherit_header pub_methods_classgeos_1_1noding_1_1Noder"><td colspan="2" onclick="javascript:toggleInherit('pub_methods_classgeos_1_1noding_1_1Noder')"><img src="closed.png" alt="-"/> Public Member Functions inherited from <a class="el" href="classgeos_1_1noding_1_1Noder.html">geos::noding::Noder</a></td></tr>
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<tr class="memitem:a51af7a896051686b867d1e6aac6f8387 inherit pub_methods_classgeos_1_1noding_1_1Noder"><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1Noder.html#a51af7a896051686b867d1e6aac6f8387">~Noder</a> ()</td></tr>
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<tr class="separator:a51af7a896051686b867d1e6aac6f8387 inherit pub_methods_classgeos_1_1noding_1_1Noder"><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:aac9ce99db105a5f9c67ecfc094da4dc1"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#aac9ce99db105a5f9c67ecfc094da4dc1">snapRound</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &inputSegStrings, std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &resultNodedSegments)</td></tr>
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<tr class="separator:aac9ce99db105a5f9c67ecfc094da4dc1"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1acc616ab50a84898b2f4c87f80ac994"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a1acc616ab50a84898b2f4c87f80ac994">addVertexPixels</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &segStrings)</td></tr>
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<tr class="separator:a1acc616ab50a84898b2f4c87f80ac994"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ad612ff207dfa9f19565bb1f642618a37"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#ad612ff207dfa9f19565bb1f642618a37">addIntersectionPixels</a> (std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &segStrings)</td></tr>
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<tr class="memitem:a6c364d4e8c2195976c52b6189af3f00a"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a6c364d4e8c2195976c52b6189af3f00a">round</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &pt, <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &ptOut)</td></tr>
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<tr class="memitem:aa2aca5805a724d17f969c6af9c4baf9c"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#aa2aca5805a724d17f969c6af9c4baf9c">round</a> (const std::vector< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> > &pts)</td></tr>
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<tr class="separator:aa2aca5805a724d17f969c6af9c4baf9c"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a00fcb30166a44849f2934b3c96517ae8"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a00fcb30166a44849f2934b3c96517ae8">computeSnaps</a> (const std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &segStrings, std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > &snapped)</td></tr>
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<tr class="memitem:a4d06d64b5e446297fe75943f70c0e0b8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a4d06d64b5e446297fe75943f70c0e0b8">computeSegmentSnaps</a> (<a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a> *ss)</td></tr>
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<tr class="separator:a4d06d64b5e446297fe75943f70c0e0b8"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a41c43aa020cdac26950939451617d8a9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a41c43aa020cdac26950939451617d8a9">snapSegment</a> (<a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p1, <a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a> *ss, size_t segIndex)</td></tr>
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<tr class="separator:a41c43aa020cdac26950939451617d8a9"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ae426c4336afafd29e457a4e516ed1bdc"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#ae426c4336afafd29e457a4e516ed1bdc">addVertexNodeSnaps</a> (<a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a> *ss)</td></tr>
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<tr class="memitem:a16122e9c53f48f13f602b1f1f0b4368e"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a16122e9c53f48f13f602b1f1f0b4368e">snapVertexNode</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &p0, <a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a> *ss, size_t segIndex)</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:a98bfe623d0c5198c584a14de494a3522"><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_1noding_1_1snapround_1_1SnapRoundingNoder.html#a98bfe623d0c5198c584a14de494a3522">pm</a></td></tr>
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<tr class="separator:a98bfe623d0c5198c584a14de494a3522"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1b50bc68b1e511d5f65b3bc2bdfb6a1e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1HotPixelIndex.html">noding::snapround::HotPixelIndex</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#a1b50bc68b1e511d5f65b3bc2bdfb6a1e">pixelIndex</a></td></tr>
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<tr class="separator:a1b50bc68b1e511d5f65b3bc2bdfb6a1e"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa9bcad1f503998d1b580761152a76aae"><td class="memItemLeft" align="right" valign="top">std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1SnapRoundingNoder.html#aa9bcad1f503998d1b580761152a76aae">snappedResult</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="inherited"></a>
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Additional Inherited Members</h2></td></tr>
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<tr class="inherit_header pro_methods_classgeos_1_1noding_1_1Noder"><td colspan="2" onclick="javascript:toggleInherit('pro_methods_classgeos_1_1noding_1_1Noder')"><img src="closed.png" alt="-"/> Protected Member Functions inherited from <a class="el" href="classgeos_1_1noding_1_1Noder.html">geos::noding::Noder</a></td></tr>
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<tr class="memitem:a44ae3fde11fa58e6f3637ebd67f6571e inherit pro_methods_classgeos_1_1noding_1_1Noder"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1noding_1_1Noder.html#a44ae3fde11fa58e6f3637ebd67f6571e">Noder</a> ()</td></tr>
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<tr class="separator:a44ae3fde11fa58e6f3637ebd67f6571e inherit pro_methods_classgeos_1_1noding_1_1Noder"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Uses Snap Rounding to compute a rounded, fully noded arrangement from a set of <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">noding::SegmentString</a>s, in a performant way, and avoiding unnecessary noding.</p>
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<p>Implements the Snap Rounding technique described in the papers by Hobby, Guibas & Marimont, and Goodrich et al. Snap Rounding enforces that all output vertices lie on a uniform grid, which is determined by the provided <a class="el" href="classgeos_1_1geom_1_1PrecisionModel.html">geom::PrecisionModel</a>.</p>
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<p>Input vertices do not have to be rounded to the grid beforehand; this is done during the snap-rounding process. In fact, rounding cannot be done a priori, since rounding vertices by themselves can distort the rounded topology of the arrangement (i.e. by moving segments away from hot pixels that would otherwise intersect them, or by moving vertices across segments).</p>
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<p>To minimize the number of introduced nodes, the Snap-Rounding <a class="el" href="classgeos_1_1noding_1_1Noder.html" title="Computes all intersections between segments in a set of SegmentString. ">Noder</a> avoids creating nodes at edge vertices if there is no intersection or snap at that location. However, if two different input edges contain identical segments, each of the segment vertices will be noded. This still provides fully-noded output. This is the same behaviour provided by other noders, such as <a class="el" href="classgeos_1_1noding_1_1MCIndexNoder.html">noding::MCIndexNoder</a> and <a class="el" href="classgeos_1_1noding_1_1snap_1_1SnappingNoder.html">noding::snap::SnappingNoder</a>. </p>
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<p>Definition at line <a class="el" href="SnapRoundingNoder_8h_source.html#l00071">71</a> of file <a class="el" href="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<a class="anchor" id="a66a32128fa4817ab6b620902389ff0ab"></a>
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<td class="memname">geos::noding::snapround::SnapRoundingNoder::SnapRoundingNoder </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>p_pm</em></td><td>)</td>
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<p>Definition at line <a class="el" href="SnapRoundingNoder_8h_source.html#l00140">140</a> of file <a class="el" href="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.h</a>.</p>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::addIntersectionPixels </td>
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<p>Detects interior intersections in the collection of <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>s, and adds nodes for them to the segment strings. Also creates <a class="el" href="classgeos_1_1noding_1_1snapround_1_1HotPixel.html" title="Implements a "hot pixel" as used in the Snap Rounding algorithm. ">HotPixel</a> nodes for the intersection points. </p>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::addVertexNodeSnaps </td>
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<td>(</td>
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<td class="paramtype"><a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a> * </td>
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<td class="paramname"><em>ss</em></td><td>)</td>
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<p>Add nodes for any vertices in hot pixels that were added as nodes during segment noding. </p>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::addVertexPixels </td>
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<td>(</td>
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<p>Creates HotPixels for each vertex in the input segStrings. The HotPixels are not marked as nodes, since they will only be nodes in the final line arrangement if they interact with other segments (or they are already created as intersection nodes). </p>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::computeNodes </td>
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<td>(</td>
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<td class="paramname"><em>inputSegStrings</em></td><td>)</td>
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<p>Computes the nodes in the snap-rounding line arrangement. The nodes are added to the <a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a>s provided as the input. </p>
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<p>Implements <a class="el" href="classgeos_1_1noding_1_1Noder.html#a42da20658cf8a969a1cbb15fd2de725d">geos::noding::Noder</a>.</p>
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<td class="memname"><a class="el" href="classgeos_1_1noding_1_1NodedSegmentString.html">NodedSegmentString</a>* geos::noding::snapround::SnapRoundingNoder::computeSegmentSnaps </td>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::computeSnaps </td>
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<td>(</td>
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<td class="paramtype">const std::vector< <a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a> * > & </td>
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<p>Computes new segment strings which are rounded and contain intersections added as a result of snapping segments to snap points (hot pixels).</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">segStrings</td><td>segments to snap </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>the snapped segment strings </dd></dl>
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<td class="memname">std::vector<<a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>*>* geos::noding::snapround::SnapRoundingNoder::getNodedSubstrings </td>
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<td>(</td>
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<td> const</td>
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<dl class="section return"><dt>Returns</dt><dd>a Collection of NodedSegmentStrings representing the substrings </dd></dl>
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<p>Implements <a class="el" href="classgeos_1_1noding_1_1Noder.html#a47dfe5a95741c2c9809d94f8ba39fa89">geos::noding::Noder</a>.</p>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::round </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">geom::Coordinate</a> & </td>
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<td class="memname">std::unique_ptr<std::vector<<a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a>> > geos::noding::snapround::SnapRoundingNoder::round </td>
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<td>(</td>
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<p>Gets a list of the rounded coordinates. Duplicate (collapsed) coordinates are removed.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<dl class="section return"><dt>Returns</dt><dd>array of rounded coordinates </dd></dl>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::snapRound </td>
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<td>(</td>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::snapSegment </td>
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<p>Snaps a segment in a segmentString to HotPixels that it intersects.</p>
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<td class="memname">void geos::noding::snapround::SnapRoundingNoder::snapVertexNode </td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname"><a class="el" href="classgeos_1_1noding_1_1snapround_1_1HotPixelIndex.html">noding::snapround::HotPixelIndex</a> geos::noding::snapround::SnapRoundingNoder::pixelIndex</td>
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<p>Definition at line <a class="el" href="SnapRoundingNoder_8h_source.html#l00077">77</a> of file <a class="el" href="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.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::noding::snapround::SnapRoundingNoder::pm</td>
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<p>Definition at line <a class="el" href="SnapRoundingNoder_8h_source.html#l00076">76</a> of file <a class="el" href="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.h</a>.</p>
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<td class="memname">std::vector<<a class="el" href="classgeos_1_1noding_1_1SegmentString.html">SegmentString</a>*> geos::noding::snapround::SnapRoundingNoder::snappedResult</td>
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<p>Definition at line <a class="el" href="SnapRoundingNoder_8h_source.html#l00078">78</a> of file <a class="el" href="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.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="SnapRoundingNoder_8h_source.html">SnapRoundingNoder.h</a></li>
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