bool QgsGeometryEditUtils::deleteRing( QgsAbstractGeometry *geom, int ringNum, int partNum )
{
if ( !geom || partNum < 0 )
{
return false;
}
if ( ringNum < 1 ) //cannot remove exterior ring
{
return false;
}
QgsAbstractGeometry *g = geom;
QgsGeometryCollection *c = qgsgeometry_cast<QgsGeometryCollection *>( geom );
if ( c )
{
g = c->geometryN( partNum );
}
else if ( partNum > 0 )
{
//part num specified, but not a multi part geometry type
return false;
}
QgsCurvePolygon *cpoly = qgsgeometry_cast<QgsCurvePolygon *>( g );
if ( !cpoly )
{
return false;
}
return cpoly->removeInteriorRing( ringNum - 1 );
}
void QgsGeometrySelfIntersectionCheck::fixError( QgsGeometryCheckError *error, int method, const QMap<QString, int> & /*mergeAttributeIndices*/, Changes &changes ) const
{
QgsFeaturePool *featurePool = mContext->featurePools[ error->layerId() ];
QgsFeature feature;
if ( !featurePool->getFeature( error->featureId(), feature ) )
{
error->setObsolete();
return;
}
QgsGeometry featureGeom = feature.geometry();
QgsAbstractGeometry *geom = featureGeom.get();
QgsVertexId vidx = error->vidx();
// Check if ring still exists
if ( !vidx.isValid( geom ) )
{
error->setObsolete();
return;
}
const QgsGeometryUtils::SelfIntersection &inter = static_cast<QgsGeometrySelfIntersectionCheckError *>( error )->intersection();
// Check if error still applies
bool ringIsClosed = false;
int nVerts = QgsGeometryCheckerUtils::polyLineSize( geom, vidx.part, vidx.ring, &ringIsClosed );
if ( nVerts == 0 || inter.segment1 >= nVerts || inter.segment2 >= nVerts )
{
error->setObsolete();
return;
}
QgsPoint p1 = geom->vertexAt( QgsVertexId( vidx.part, vidx.ring, inter.segment1 ) );
QgsPoint q1 = geom->vertexAt( QgsVertexId( vidx.part, vidx.ring, inter.segment2 ) );
QgsPoint p2 = geom->vertexAt( QgsVertexId( vidx.part, vidx.ring, ( inter.segment1 + 1 ) % nVerts ) );
QgsPoint q2 = geom->vertexAt( QgsVertexId( vidx.part, vidx.ring, ( inter.segment2 + 1 ) % nVerts ) );
QgsPoint s;
bool intersection = false;
if ( !QgsGeometryUtils::segmentIntersection( p1, p2, q1, q2, s, intersection, mContext->tolerance ) )
{
error->setObsolete();
return;
}
// Fix with selected method
if ( method == NoChange )
{
error->setFixed( method );
}
else if ( method == ToMultiObject || method == ToSingleObjects )
{
// Extract rings
QgsPointSequence ring1, ring2;
bool ring1EndsWithS = false;
bool ring2EndsWithS = false;
for ( int i = 0; i < nVerts; ++i )
{
if ( i <= inter.segment1 || i >= inter.segment2 + 1 )
{
ring1.append( geom->vertexAt( QgsVertexId( vidx.part, vidx.ring, i ) ) );
ring1EndsWithS = false;
if ( i == inter.segment2 + 1 )
{
ring2.append( s );
ring2EndsWithS = true;
}
}
else
{
ring2.append( geom->vertexAt( QgsVertexId( vidx.part, vidx.ring, i ) ) );
ring2EndsWithS = true;
if ( i == inter.segment1 + 1 )
{
ring1.append( s );
ring1EndsWithS = false;
}
}
}
if ( nVerts == inter.segment2 + 1 )
{
ring2.append( s );
ring2EndsWithS = true;
}
if ( ringIsClosed || ring1EndsWithS )
ring1.append( ring1.front() ); // Ensure ring is closed
if ( ringIsClosed || ring2EndsWithS )
ring2.append( ring2.front() ); // Ensure ring is closed
if ( ring1.size() < 3 + ( ringIsClosed || ring1EndsWithS ) || ring2.size() < 3 + ( ringIsClosed || ring2EndsWithS ) )
{
error->setFixFailed( tr( "Resulting geometry is degenerate" ) );
return;
}
QgsLineString *ringGeom1 = new QgsLineString();
ringGeom1->setPoints( ring1 );
QgsLineString *ringGeom2 = new QgsLineString();
ringGeom2->setPoints( ring2 );
QgsAbstractGeometry *part = QgsGeometryCheckerUtils::getGeomPart( geom, vidx.part );
// If is a polygon...
if ( dynamic_cast<QgsCurvePolygon *>( part ) )
{
QgsCurvePolygon *poly = static_cast<QgsCurvePolygon *>( part );
// If self-intersecting ring is an interior ring, create separate holes
if ( vidx.ring > 0 )
{
poly->removeInteriorRing( vidx.ring );
poly->addInteriorRing( ringGeom1 );
poly->addInteriorRing( ringGeom2 );
changes[error->layerId()][feature.id()].append( Change( ChangeRing, ChangeRemoved, vidx ) );
changes[error->layerId()][feature.id()].append( Change( ChangeRing, ChangeAdded, QgsVertexId( vidx.part, poly->ringCount() - 2 ) ) );
changes[error->layerId()][feature.id()].append( Change( ChangeRing, ChangeAdded, QgsVertexId( vidx.part, poly->ringCount() - 1 ) ) );
feature.setGeometry( featureGeom );
featurePool->updateFeature( feature );
}
else
{
// If ring is exterior, build two polygons, and reassign interiors as necessary
poly->setExteriorRing( ringGeom1 );
// If original feature was a linear polygon, also create the new part as a linear polygon
QgsCurvePolygon *poly2 = dynamic_cast<QgsPolygon *>( part ) ? new QgsPolygon() : new QgsCurvePolygon();
poly2->setExteriorRing( ringGeom2 );
// Reassing interiors as necessary
std::unique_ptr< QgsGeometryEngine > geomEnginePoly1 = QgsGeometryCheckerUtils::createGeomEngine( poly, mContext->tolerance );
std::unique_ptr< QgsGeometryEngine > geomEnginePoly2 = QgsGeometryCheckerUtils::createGeomEngine( poly2, mContext->tolerance );
for ( int n = poly->numInteriorRings(), i = n - 1; i >= 0; --i )
{
if ( !geomEnginePoly1->contains( poly->interiorRing( i ) ) )
{
if ( geomEnginePoly2->contains( poly->interiorRing( i ) ) )
{
poly2->addInteriorRing( static_cast<QgsCurve *>( poly->interiorRing( i )->clone() ) );
// No point in adding ChangeAdded changes, since the entire poly2 is added anyways later on
}
poly->removeInteriorRing( i );
changes[error->layerId()][feature.id()].append( Change( ChangeRing, ChangeRemoved, QgsVertexId( vidx.part, 1 + i ) ) );
}
}
if ( method == ToMultiObject )
{
// If is already a geometry collection, just add the new polygon.
if ( dynamic_cast<QgsGeometryCollection *>( geom ) )
{
static_cast<QgsGeometryCollection *>( geom )->addGeometry( poly2 );
changes[error->layerId()][feature.id()].append( Change( ChangeRing, ChangeChanged, QgsVertexId( vidx.part, vidx.ring ) ) );
changes[error->layerId()][feature.id()].append( Change( ChangePart, ChangeAdded, QgsVertexId( geom->partCount() - 1 ) ) );
feature.setGeometry( featureGeom );
featurePool->updateFeature( feature );
}
// Otherwise, create multipolygon
else
{
QgsMultiPolygon *multiPoly = new QgsMultiPolygon();
multiPoly->addGeometry( poly->clone() );
multiPoly->addGeometry( poly2 );
feature.setGeometry( QgsGeometry( multiPoly ) );
featurePool->updateFeature( feature );
changes[error->layerId()][feature.id()].append( Change( ChangeFeature, ChangeChanged ) );
}
}
else // if ( method == ToSingleObjects )
{
QgsFeature newFeature;
newFeature.setAttributes( feature.attributes() );
newFeature.setGeometry( QgsGeometry( poly2 ) );
feature.setGeometry( featureGeom );
featurePool->updateFeature( feature );
featurePool->addFeature( newFeature );
changes[error->layerId()][feature.id()].append( Change( ChangeRing, ChangeChanged, QgsVertexId( vidx.part, vidx.ring ) ) );
changes[error->layerId()][newFeature.id()].append( Change( ChangeFeature, ChangeAdded ) );
}
}
}
else if ( dynamic_cast<QgsCurve *>( part ) )
{
if ( method == ToMultiObject )
{
if ( dynamic_cast<QgsGeometryCollection *>( geom ) )
{
QgsGeometryCollection *geomCollection = static_cast<QgsGeometryCollection *>( geom );
geomCollection->removeGeometry( vidx.part );
geomCollection->addGeometry( ringGeom1 );
geomCollection->addGeometry( ringGeom2 );
feature.setGeometry( featureGeom );
featurePool->updateFeature( feature );
changes[error->layerId()][feature.id()].append( Change( ChangePart, ChangeRemoved, QgsVertexId( vidx.part ) ) );
changes[error->layerId()][feature.id()].append( Change( ChangePart, ChangeAdded, QgsVertexId( geomCollection->partCount() - 2 ) ) );
changes[error->layerId()][feature.id()].append( Change( ChangePart, ChangeAdded, QgsVertexId( geomCollection->partCount() - 1 ) ) );
}
else
{
QgsMultiCurve *geomCollection = new QgsMultiLineString();
geomCollection->addGeometry( ringGeom1 );
geomCollection->addGeometry( ringGeom2 );
feature.setGeometry( QgsGeometry( geomCollection ) );
featurePool->updateFeature( feature );
changes[error->layerId()][feature.id()].append( Change( ChangeFeature, ChangeChanged ) );
}
}
else // if(method == ToSingleObjects)
{
if ( dynamic_cast<QgsGeometryCollection *>( geom ) )
{
QgsGeometryCollection *geomCollection = static_cast<QgsGeometryCollection *>( geom );
geomCollection->removeGeometry( vidx.part );
geomCollection->addGeometry( ringGeom1 );
feature.setGeometry( featureGeom );
featurePool->updateFeature( feature );
changes[error->layerId()][feature.id()].append( Change( ChangePart, ChangeRemoved, QgsVertexId( vidx.part ) ) );
changes[error->layerId()][feature.id()].append( Change( ChangePart, ChangeAdded, QgsVertexId( geomCollection->partCount() - 1 ) ) );
}
else
{
feature.setGeometry( QgsGeometry( ringGeom1 ) );
featurePool->updateFeature( feature );
changes[error->layerId()][feature.id()].append( Change( ChangeFeature, ChangeChanged, QgsVertexId( vidx.part ) ) );
}
QgsFeature newFeature;
newFeature.setAttributes( feature.attributes() );
newFeature.setGeometry( QgsGeometry( ringGeom2 ) );
featurePool->addFeature( newFeature );
changes[error->layerId()][newFeature.id()].append( Change( ChangeFeature, ChangeAdded ) );
}
}
else
{
delete ringGeom1;
delete ringGeom2;
}
error->setFixed( method );
}
else
{
error->setFixFailed( tr( "Unknown method" ) );
}
}
