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121 lines
4.8 KiB
C++
121 lines
4.8 KiB
C++
/***************************************************************************
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* qgsgeometrycheckerutils.cpp *
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* ------------------- *
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* copyright : (C) 2014 by Sandro Mani / Sourcepole AG *
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* email : smani@sourcepole.ch *
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "qgsgeometryutils.h"
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#include "qgsgeos.h"
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#include "qgsgeometrycollection.h"
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#include "qgssurface.h"
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namespace QgsGeometryCheckerUtils
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{
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QgsGeometryEngine *createGeomEngine( QgsAbstractGeometry *geometry, double tolerance )
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{
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return new QgsGeos( geometry, tolerance );
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}
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QgsAbstractGeometry *getGeomPart( QgsAbstractGeometry *geom, int partIdx )
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{
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if ( dynamic_cast<QgsGeometryCollection *>( geom ) )
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{
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return static_cast<QgsGeometryCollection *>( geom )->geometryN( partIdx );
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}
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return geom;
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}
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void filter1DTypes( QgsAbstractGeometry *geom )
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{
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if ( dynamic_cast<QgsGeometryCollection *>( geom ) )
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{
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QgsGeometryCollection *geomCollection = static_cast<QgsGeometryCollection *>( geom );
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for ( int nParts = geom->partCount(), iPart = nParts - 1; iPart >= 0; --iPart )
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{
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if ( !dynamic_cast<QgsSurface *>( geomCollection->geometryN( iPart ) ) )
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{
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geomCollection->removeGeometry( iPart );
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}
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}
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}
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}
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static inline double pointLineDist( const QgsPoint &p1, const QgsPoint &p2, const QgsPoint &q )
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{
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double nom = std::fabs( ( p2.y() - p1.y() ) * q.x() - ( p2.x() - p1.x() ) * q.y() + p2.x() * p1.y() - p2.y() * p1.x() );
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double dx = p2.x() - p1.x();
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double dy = p2.y() - p1.y();
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return nom / std::sqrt( dx * dx + dy * dy );
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}
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double sharedEdgeLength( const QgsAbstractGeometry *geom1, const QgsAbstractGeometry *geom2, double tol )
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{
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double len = 0;
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// Test every pair of segments for shared edges
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for ( int iPart1 = 0, nParts1 = geom1->partCount(); iPart1 < nParts1; ++iPart1 )
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{
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for ( int iRing1 = 0, nRings1 = geom1->ringCount( iPart1 ); iRing1 < nRings1; ++iRing1 )
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{
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for ( int iVert1 = 0, jVert1 = 1, nVerts1 = geom1->vertexCount( iPart1, iRing1 ); jVert1 < nVerts1; iVert1 = jVert1++ )
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{
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QgsPoint p1 = geom1->vertexAt( QgsVertexId( iPart1, iRing1, iVert1 ) );
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QgsPoint p2 = geom1->vertexAt( QgsVertexId( iPart1, iRing1, jVert1 ) );
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double lambdap1 = 0.;
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double lambdap2 = std::sqrt( QgsGeometryUtils::sqrDistance2D( p1, p2 ) );
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QgsVector d;
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try
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{
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d = QgsVector( p2.x() - p1.x(), p2.y() - p1.y() ).normalized();
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}
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catch ( const QgsException & )
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{
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// Edge has zero length, skip
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continue;
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}
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for ( int iPart2 = 0, nParts2 = geom2->partCount(); iPart2 < nParts2; ++iPart2 )
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{
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for ( int iRing2 = 0, nRings2 = geom2->ringCount( iPart2 ); iRing2 < nRings2; ++iRing2 )
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{
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for ( int iVert2 = 0, jVert2 = 1, nVerts2 = geom2->vertexCount( iPart2, iRing2 ); jVert2 < nVerts2; iVert2 = jVert2++ )
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{
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QgsPoint q1 = geom2->vertexAt( QgsVertexId( iPart2, iRing2, iVert2 ) );
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QgsPoint q2 = geom2->vertexAt( QgsVertexId( iPart2, iRing2, jVert2 ) );
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// Check whether q1 and q2 are on the line p1, p
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if ( pointLineDist( p1, p2, q1 ) <= tol && pointLineDist( p1, p2, q2 ) <= tol )
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{
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// Get length common edge
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double lambdaq1 = QgsVector( q1.x() - p1.x(), q1.y() - p1.y() ) * d;
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double lambdaq2 = QgsVector( q2.x() - p1.x(), q2.y() - p1.y() ) * d;
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if ( lambdaq1 > lambdaq2 )
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{
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std::swap( lambdaq1, lambdaq2 );
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}
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double lambda1 = qMax( lambdaq1, lambdap1 );
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double lambda2 = qMin( lambdaq2, lambdap2 );
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len += qMax( 0., lambda2 - lambda1 );
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}
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}
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}
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}
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}
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}
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}
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return len;
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}
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} // QgsGeometryCheckerUtils
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