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553 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_1overlay.html">overlay</a></li><li class="navelem"><a class="el" href="namespacegeos_1_1operation_1_1overlay_1_1snap.html">snap</a></li><li class="navelem"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html">LineStringSnapper</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">geos::operation::overlay::snap::LineStringSnapper Class Reference</div> </div>
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<p>Snaps the vertices and segments of a LineString to a set of target snap vertices.
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<a href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.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:ac1ed05effa3c85f646a7be278f460fdc"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#ac1ed05effa3c85f646a7be278f460fdc">LineStringSnapper</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59345d3a409b5d2ebe01fcfcdcca92cb">geom::Coordinate::Vect</a> &nSrcPts, double nSnapTol)</td></tr>
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<tr class="separator:ac1ed05effa3c85f646a7be278f460fdc"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1829a66d38ef7c673a31684d7427f731"><td class="memItemLeft" align="right" valign="top">std::unique_ptr< <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59345d3a409b5d2ebe01fcfcdcca92cb">geom::Coordinate::Vect</a> > </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a1829a66d38ef7c673a31684d7427f731">snapTo</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> &snapPts)</td></tr>
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<tr class="separator:a1829a66d38ef7c673a31684d7427f731"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:adb13fd1f9b87bd5d8f42c7acacc4cc42"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#adb13fd1f9b87bd5d8f42c7acacc4cc42">setAllowSnappingToSourceVertices</a> (bool allow)</td></tr>
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<tr class="separator:adb13fd1f9b87bd5d8f42c7acacc4cc42"><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:a6c35dd1bebdcef0e2f88c9f16fe1ae1d"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a6c35dd1bebdcef0e2f88c9f16fe1ae1d">snapVertices</a> (<a class="el" href="classgeos_1_1geom_1_1CoordinateList.html">geom::CoordinateList</a> &srcCoords, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> &snapPts)</td></tr>
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<tr class="separator:a6c35dd1bebdcef0e2f88c9f16fe1ae1d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a0cad55b7fd00f37feb182970b7cf2f17"><td class="memItemLeft" align="right" valign="top">geom::Coordinate::ConstVect::const_iterator </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a0cad55b7fd00f37feb182970b7cf2f17">findSnapForVertex</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &pt, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> &snapPts)</td></tr>
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<tr class="memitem:a7d00065de70108f90dedb6d5a0ce5d61"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a7d00065de70108f90dedb6d5a0ce5d61">snapSegments</a> (<a class="el" href="classgeos_1_1geom_1_1CoordinateList.html">geom::CoordinateList</a> &srcCoords, const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> &snapPts)</td></tr>
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<tr class="memdesc:a7d00065de70108f90dedb6d5a0ce5d61"><td class="mdescLeft"> </td><td class="mdescRight">Snap segments of the source to nearby snap vertices. <a href="#a7d00065de70108f90dedb6d5a0ce5d61">More...</a><br /></td></tr>
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<tr class="separator:a7d00065de70108f90dedb6d5a0ce5d61"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a79c7d7d829f111238fb388996318536d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a79c7d7d829f111238fb388996318536d">findSegmentToSnap</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &snapPt, <a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> from, <a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> too_far)</td></tr>
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<tr class="memdesc:a79c7d7d829f111238fb388996318536d"><td class="mdescLeft"> </td><td class="mdescRight">Finds a src segment which snaps to (is close to) the given snap point. <a href="#a79c7d7d829f111238fb388996318536d">More...</a><br /></td></tr>
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<tr class="separator:a79c7d7d829f111238fb388996318536d"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aceb3d2018a53945d063dceb3ee688e4c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#aceb3d2018a53945d063dceb3ee688e4c">findVertexToSnap</a> (const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html">geom::Coordinate</a> &snapPt, <a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> from, <a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> too_far)</td></tr>
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<tr class="memitem:a9f3676ab980bbd5ae639b3ba568af45f"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a9f3676ab980bbd5ae639b3ba568af45f">LineStringSnapper</a> (const <a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html">LineStringSnapper</a> &other)=delete</td></tr>
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<tr class="memitem:a5badab1b1b47eb7deaadb21ffb7b2438"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html">LineStringSnapper</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a5badab1b1b47eb7deaadb21ffb7b2438">operator=</a> (const <a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html">LineStringSnapper</a> &rhs)=delete</td></tr>
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Private Attributes</h2></td></tr>
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<tr class="memitem:a2123bdd30ced8c296ab17521c491943a"><td class="memItemLeft" align="right" valign="top">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59345d3a409b5d2ebe01fcfcdcca92cb">geom::Coordinate::Vect</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a2123bdd30ced8c296ab17521c491943a">srcPts</a></td></tr>
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<tr class="memitem:a57be7c7162f7f1e8797d30404fd88635"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a57be7c7162f7f1e8797d30404fd88635">snapTolerance</a></td></tr>
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<tr class="memitem:ad2745bb9a84915af4f1cd926ba4a1604"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#ad2745bb9a84915af4f1cd926ba4a1604">allowSnappingToSourceVertices</a></td></tr>
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<tr class="memitem:a3caa4ef41463b3d33db5a86d17894719"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html#a3caa4ef41463b3d33db5a86d17894719">isClosed</a></td></tr>
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<tr class="separator:a3caa4ef41463b3d33db5a86d17894719"><td class="memSeparator" colspan="2"> </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>Snaps the vertices and segments of a LineString to a set of target snap vertices. </p>
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<p>A snapping distance tolerance is used to control where snapping is performed. </p>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00051">51</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.h</a>.</p>
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</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<td class="memname">geos::operation::overlay::snap::LineStringSnapper::LineStringSnapper </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#a59345d3a409b5d2ebe01fcfcdcca92cb">geom::Coordinate::Vect</a> & </td>
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<td class="paramname"><em>nSrcPts</em>, </td>
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<td class="paramtype">double </td>
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<td>)</td>
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<p>Creates a new snapper using the given points as source points to be snapped.</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">nSrcPts</td><td>the points to snap </td></tr>
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<tr><td class="paramname">nSnapTol</td><td>the snap tolerance to use </td></tr>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00062">62</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.h</a>.</p>
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<span class="mlabels"><span class="mlabel">private</span><span class="mlabel">delete</span></span> </td>
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<h2 class="groupheader">Member Function Documentation</h2>
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<td class="memname"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> geos::operation::overlay::snap::LineStringSnapper::findSegmentToSnap </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="paramname"><em>snapPt</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> </td>
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<td class="paramname"><em>from</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> </td>
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<p>Finds a src segment which snaps to (is close to) the given snap point. </p>
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<p>Only a single segment is selected for snapping. This prevents multiple segments snapping to the same snap vertex, which would almost certainly cause invalid geometry to be created. (The heuristic approach to snapping used here is really only appropriate when snap pts snap to a unique spot on the src geometry.)</p>
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<p>Also, if the snap vertex occurs as a vertex in the src coordinate list, no snapping is performed (may be changed using setAllowSnappingToSourceVertices).</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">from</td><td>an iterator to first point of first segment to be checked</td></tr>
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<tr><td class="paramname">too_far</td><td>an iterator to last point of last segment to be checked</td></tr>
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</dd>
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<dl class="section return"><dt>Returns</dt><dd>an iterator to the snapped segment or too_far if no segment needs snapping (either none within snapTol distance, or one found on the snapPt) </dd></dl>
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<td class="memname">geom::Coordinate::ConstVect::const_iterator geos::operation::overlay::snap::LineStringSnapper::findSnapForVertex </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="paramname"><em>pt</em>, </td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> & </td>
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<td class="paramname"><em>snapPts</em> </td>
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<td class="memname"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> geos::operation::overlay::snap::LineStringSnapper::findVertexToSnap </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="paramname"><em>snapPt</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> </td>
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<td class="paramname"><em>from</em>, </td>
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<td class="paramtype"><a class="el" href="classgeos_1_1geom_1_1CoordinateList.html#a1c5d129b14a3475478e8f9bd150153f8">geom::CoordinateList::iterator</a> </td>
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<td class="memname"><a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html">LineStringSnapper</a>& geos::operation::overlay::snap::LineStringSnapper::operator= </td>
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<td>(</td>
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<td class="paramtype">const <a class="el" href="classgeos_1_1operation_1_1overlay_1_1snap_1_1LineStringSnapper.html">LineStringSnapper</a> & </td>
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<td class="paramname"><em>rhs</em></td><td>)</td>
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<td class="memname">void geos::operation::overlay::snap::LineStringSnapper::setAllowSnappingToSourceVertices </td>
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<td>(</td>
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<td class="paramtype">bool </td>
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<td class="paramname"><em>allow</em></td><td>)</td>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00077">77</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.h</a>.</p>
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<td class="memname">void geos::operation::overlay::snap::LineStringSnapper::snapSegments </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#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> & </td>
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<td>)</td>
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<p>Snap segments of the source to nearby snap vertices. </p>
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<p>Source segments are "cracked" at a snap vertex. A single input segment may be snapped several times to different snap vertices.</p>
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<p>For each distinct snap vertex, at most one source segment is snapped to. This prevents "cracking" multiple segments at the same point, which would likely cause topology collapse when being used on polygonal linework.</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">srcCoords</td><td>the coordinates of the source linestring to be snapped the object will be modified (coords snapped) </td></tr>
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<td class="memname">std::unique_ptr<<a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59345d3a409b5d2ebe01fcfcdcca92cb">geom::Coordinate::Vect</a>> geos::operation::overlay::snap::LineStringSnapper::snapTo </td>
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<td class="memname">void geos::operation::overlay::snap::LineStringSnapper::snapVertices </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#a59a363dbe699943a46ea014355e63cac">geom::Coordinate::ConstVect</a> & </td>
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<h2 class="groupheader">Member Data Documentation</h2>
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<td class="memname">bool geos::operation::overlay::snap::LineStringSnapper::allowSnappingToSourceVertices</td>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00088">88</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.h</a>.</p>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00089">89</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.h</a>.</p>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00086">86</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.h</a>.</p>
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<td class="memname">const <a class="el" href="classgeos_1_1geom_1_1Coordinate.html#a59345d3a409b5d2ebe01fcfcdcca92cb">geom::Coordinate::Vect</a>& geos::operation::overlay::snap::LineStringSnapper::srcPts</td>
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<p>Definition at line <a class="el" href="LineStringSnapper_8h_source.html#l00084">84</a> of file <a class="el" href="LineStringSnapper_8h_source.html">LineStringSnapper.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="LineStringSnapper_8h_source.html">LineStringSnapper.h</a></li>
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