void QgsGeometryAnalyzer::bufferFeature( QgsFeature& f, int nProcessedFeatures, QgsVectorFileWriter* vfw, bool dissolve,
QgsGeometry** dissolveGeometry, double bufferDistance, int bufferDistanceField )
{
double currentBufferDistance;
QgsGeometry* featureGeometry = f.geometry();
QgsGeometry* tmpGeometry = 0;
QgsGeometry* bufferGeometry = 0;
if ( !featureGeometry )
{
return;
}
//create buffer
if ( bufferDistanceField == -1 )
{
currentBufferDistance = bufferDistance;
}
else
{
currentBufferDistance = f.attribute( bufferDistanceField ).toDouble();
}
bufferGeometry = featureGeometry->buffer( currentBufferDistance, 5 );
if ( dissolve )
{
if ( nProcessedFeatures == 0 )
{
*dissolveGeometry = bufferGeometry;
}
else
{
tmpGeometry = *dissolveGeometry;
*dissolveGeometry = ( *dissolveGeometry )->combine( bufferGeometry );
delete tmpGeometry;
delete bufferGeometry;
}
}
else //dissolve
{
QgsFeature newFeature;
newFeature.setGeometry( bufferGeometry );
newFeature.setAttributes( f.attributes() );
//add it to vector file writer
if ( vfw )
{
vfw->addFeature( newFeature );
}
}
}
bool QgsTransectSample::otherTransectWithinDistance( const QgsGeometry& geom, double minDistLayerUnit, double minDistance, QgsSpatialIndex& sIndex,
const QMap< QgsFeatureId, QgsGeometry >& lineFeatureMap, QgsDistanceArea& da )
{
if ( geom.isEmpty() )
{
return false;
}
QgsGeometry buffer = geom.buffer( minDistLayerUnit, 8 );
if ( buffer.isEmpty() )
{
return false;
}
QgsRectangle rect = buffer.boundingBox();
QList<QgsFeatureId> lineIdList = sIndex.intersects( rect );
QList<QgsFeatureId>::const_iterator lineIdIt = lineIdList.constBegin();
for ( ; lineIdIt != lineIdList.constEnd(); ++lineIdIt )
{
const QMap< QgsFeatureId, QgsGeometry >::const_iterator idMapIt = lineFeatureMap.find( *lineIdIt );
if ( idMapIt != lineFeatureMap.constEnd() )
{
double dist = 0;
QgsPoint pt1, pt2;
closestSegmentPoints( geom, idMapIt.value(), dist, pt1, pt2 );
dist = da.measureLine( pt1, pt2 ); //convert degrees to meters if necessary
if ( dist < minDistance )
{
return true;
}
}
}
return false;
}
void eval_geometry_method_data()
{
QTest::addColumn<QString>( "string" );
QTest::addColumn<void*>( "geomptr" );
QTest::addColumn<bool>( "evalError" );
QTest::addColumn<bool>( "needGeom" );
QTest::addColumn<void*>( "resultptr" );
QgsPolyline polygon_ring;
polygon_ring << QgsPoint( 0, 0 ) << QgsPoint( 10, 10 ) << QgsPoint( 10, 0 ) << QgsPoint( 0, 0 );
QgsPolygon polygon;
polygon << polygon_ring;
QgsGeometry* geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "buffer" ) << "buffer( $geometry, 1.0, 3)" << ( void* ) geom << false << true << ( void* ) geom->buffer( 1.0, 3 );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "buffer" ) << "buffer( $geometry, 2.0)" << ( void* ) geom << false << true << ( void* ) geom->buffer( 2.0, 8 );
QgsPoint point1( 10, 20 );
QgsPoint point2( 30, 20 );
QgsGeometry* pnt1 = QgsGeometry::fromPoint( point1 );
QgsGeometry* pnt2 = QgsGeometry::fromPoint( point2 );
QTest::newRow( "union" ) << "union( $geometry, geomFromWKT('" + pnt2->exportToWkt() + "') )" << ( void* ) pnt1 << false << true << ( void* ) pnt1->combine( pnt2 );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "intersection" ) << "intersection( $geometry, geomFromWKT('POLYGON((0 0, 0 10, 10 0, 0 0))') )" << ( void* ) geom << false << true << ( void* ) QgsGeometry::fromWkt( "POLYGON ((0 0,5 5,10 0,0 0))" );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "difference" ) << "difference( $geometry, geomFromWKT('POLYGON((0 0, 0 10, 10 0, 0 0))') )" << ( void* ) geom << false << true << ( void* ) QgsGeometry::fromWkt( "POLYGON ((5 5,10 10,10 0,5 5))" );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "symDifference" ) << "symDifference( $geometry, geomFromWKT('POLYGON((0 0, 0 10, 10 0, 0 0))') )" << ( void* ) geom << false << true << ( void* ) QgsGeometry::fromWkt( "MULTIPOLYGON(((5 5,0 0,0 10,5 5)),((5 5,10 10,10 0,5 5)))" );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "centroid polygon" ) << "centroid( $geometry )" << ( void* ) geom << false << true << ( void* ) geom->centroid();
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "centroid self intersecting polygon" ) << "centroid( geomFromWKT('POLYGON((0 0, 0 2, 2 -0.1, 2 2.1, 0 0))') )" << ( void* ) geom << false << false << ( void* ) QgsGeometry::fromWkt( "POINT (8.0 1.0)" );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "centroid multi polygon" ) << "centroid( geomFromWKT('MULTIPOLYGON(((0 0,0 1,1 1,1 0,0 0)),((2 0,2 1,3 1,3 0,2 0)))') )" << ( void* ) geom << false << false << ( void* ) QgsGeometry::fromWkt( "POINT (1.5 0.5)" );
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "convexHull simple" ) << "convexHull( $geometry )" << ( void* ) geom << false << true << ( void* ) geom->convexHull();
geom = QgsGeometry::fromPolygon( polygon );
QTest::newRow( "convexHull multi" ) << "convexHull( geomFromWKT('GEOMETRYCOLLECTION(POINT(0 1), POINT(0 0), POINT(1 0), POINT(1 1))') )" << ( void* ) geom << false << false << ( void* ) QgsGeometry::fromWkt( "POLYGON ((0 0,0 1,1 1,1 0,0 0))" );
}
QgsGeometry* QgsTransectSample::clipBufferLine( const QgsGeometry& stratumGeom, QgsGeometry* clippedBaseline, double tolerance )
{
if ( !stratumGeom || !clippedBaseline || clippedBaseline->wkbType() == QgsWkbTypes::Unknown )
{
return nullptr;
}
QgsGeometry usedBaseline = *clippedBaseline;
if ( mBaselineSimplificationTolerance >= 0 )
{
//int verticesBefore = usedBaseline->asMultiPolyline().count();
usedBaseline = clippedBaseline->simplify( mBaselineSimplificationTolerance );
if ( usedBaseline.isEmpty() )
{
return nullptr;
}
//int verticesAfter = usedBaseline->asMultiPolyline().count();
//debug: write to file
/*QgsVectorFileWriter debugWriter( "/tmp/debug.shp", "utf-8", QgsFields(), QgsWkbTypes::LineString, &( mStrataLayer->crs() ) );
QgsFeature debugFeature; debugFeature.setGeometry( usedBaseline );
debugWriter.addFeature( debugFeature );*/
}
double currentBufferDist = tolerance;
int maxLoops = 10;
for ( int i = 0; i < maxLoops; ++i )
{
//loop with tolerance: create buffer, convert buffer to line, clip line by stratum, test if result is (single) line
QgsGeometry clipBaselineBuffer = usedBaseline.buffer( currentBufferDist, 8 );
if ( clipBaselineBuffer.isEmpty() )
{
continue;
}
//it is also possible that clipBaselineBuffer is a multipolygon
QgsGeometry bufferLine; //buffer line or multiline
QgsGeometry bufferLineClipped;
QgsMultiPolyline mpl;
if ( clipBaselineBuffer.isMultipart() )
{
QgsMultiPolygon bufferMultiPolygon = clipBaselineBuffer.asMultiPolygon();
if ( bufferMultiPolygon.size() < 1 )
{
continue;
}
for ( int j = 0; j < bufferMultiPolygon.size(); ++j )
{
int size = bufferMultiPolygon.at( j ).size();
for ( int k = 0; k < size; ++k )
{
mpl.append( bufferMultiPolygon.at( j ).at( k ) );
}
}
bufferLine = QgsGeometry::fromMultiPolyline( mpl );
}
else
{
QgsPolygon bufferPolygon = clipBaselineBuffer.asPolygon();
if ( bufferPolygon.size() < 1 )
{
continue;
}
int size = bufferPolygon.size();
mpl.reserve( size );
for ( int j = 0; j < size; ++j )
{
mpl.append( bufferPolygon[j] );
}
bufferLine = QgsGeometry::fromMultiPolyline( mpl );
}
bufferLineClipped = bufferLine.intersection( stratumGeom );
if ( bufferLineClipped.isEmpty() && bufferLineClipped.type() == QgsWkbTypes::LineGeometry )
{
//if stratumGeom is a multipolygon, bufferLineClipped must intersect each part
bool bufferLineClippedIntersectsStratum = true;
if ( stratumGeom.wkbType() == QgsWkbTypes::MultiPolygon || stratumGeom.wkbType() == QgsWkbTypes::MultiPolygon25D )
{
QVector<QgsPolygon> multiPoly = stratumGeom.asMultiPolygon();
QVector<QgsPolygon>::const_iterator multiIt = multiPoly.constBegin();
for ( ; multiIt != multiPoly.constEnd(); ++multiIt )
{
QgsGeometry poly = QgsGeometry::fromPolygon( *multiIt );
if ( !poly.intersects( bufferLineClipped ) )
{
bufferLineClippedIntersectsStratum = false;
break;
}
}
}
if ( bufferLineClippedIntersectsStratum )
{
return new QgsGeometry( bufferLineClipped );
}
}
currentBufferDist /= 2;
}
return nullptr; //no solution found even with reduced tolerances
}
ErrorList topolTest::checkGaps( QgsVectorLayer *layer1, QgsVectorLayer *layer2, bool isExtent )
{
Q_UNUSED( layer2 );
int i = 0;
ErrorList errorList;
GEOSContextHandle_t geosctxt = QgsGeos::getGEOSHandler();
// could be enabled for lines and points too
// so duplicate rule may be removed?
if ( layer1->geometryType() != QgsWkbTypes::PolygonGeometry )
{
return errorList;
}
QList<FeatureLayer>::iterator it;
QgsGeometry g1;
QList<GEOSGeometry *> geomList;
qDebug() << mFeatureList1.count() << " features in list!";
for ( it = mFeatureList1.begin(); it != mFeatureList1.end(); ++it )
{
qDebug() << "reading features-" << i;
if ( !( ++i % 100 ) )
{
emit progress( i );
}
if ( testCanceled() )
{
break;
}
g1 = it->feature.geometry();
if ( g1.isNull() )
{
continue;
}
if ( !_canExportToGeos( g1 ) )
{
continue;
}
if ( !g1.isGeosValid() )
{
qDebug() << "invalid geometry found..skipping.." << it->feature.id();
continue;
}
if ( g1.isMultipart() )
{
QgsMultiPolygonXY polys = g1.asMultiPolygon();
for ( int m = 0; m < polys.count(); m++ )
{
QgsPolygonXY polygon = polys[m];
QgsGeometry polyGeom = QgsGeometry::fromPolygonXY( polygon );
geomList.push_back( QgsGeos::asGeos( polyGeom ).release() );
}
}
else
{
geomList.push_back( QgsGeos::asGeos( g1 ).release() );
}
}
GEOSGeometry **geomArray = new GEOSGeometry*[geomList.size()];
for ( int i = 0; i < geomList.size(); ++i )
{
//qDebug() << "filling geometry array-" << i;
geomArray[i] = geomList.at( i );
}
qDebug() << "creating geometry collection-";
if ( geomList.isEmpty() )
{
//qDebug() << "geometry list is empty!";
delete [] geomArray;
return errorList;
}
GEOSGeometry *collection = nullptr;
collection = GEOSGeom_createCollection_r( geosctxt, GEOS_MULTIPOLYGON, geomArray, geomList.size() );
qDebug() << "performing cascaded union..might take time..-";
GEOSGeometry *unionGeom = GEOSUnionCascaded_r( geosctxt, collection );
//delete[] geomArray;
QgsGeometry test = QgsGeos::geometryFromGeos( unionGeom );
//qDebug() << "wktmerged - " << test.exportToWkt();
QString extentWkt = test.boundingBox().asWktPolygon();
QgsGeometry extentGeom = QgsGeometry::fromWkt( extentWkt );
QgsGeometry bufferExtent = extentGeom.buffer( 2, 3 );
//qDebug() << "extent wkt - " << bufferExtent->exportToWkt();
QgsGeometry diffGeoms = bufferExtent.difference( test );
if ( !diffGeoms )
{
qDebug() << "difference result 0-";
return errorList;
}
//qDebug() << "difference gometry - " << diffGeoms->exportToWkt();
QVector<QgsGeometry> geomColl = diffGeoms.asGeometryCollection();
QgsGeometry canvasExtentPoly = QgsGeometry::fromWkt( qgsInterface->mapCanvas()->extent().asWktPolygon() );
for ( int i = 1; i < geomColl.count() ; ++i )
{
QgsGeometry conflictGeom = geomColl[i];
if ( isExtent )
{
if ( canvasExtentPoly.disjoint( conflictGeom ) )
{
continue;
}
if ( canvasExtentPoly.crosses( conflictGeom ) )
{
conflictGeom = conflictGeom.intersection( canvasExtentPoly );
}
}
QgsRectangle bBox = conflictGeom.boundingBox();
FeatureLayer ftrLayer1;
ftrLayer1.layer = layer1;
QList<FeatureLayer> errorFtrLayers;
errorFtrLayers << ftrLayer1 << ftrLayer1;
TopolErrorGaps *err = new TopolErrorGaps( bBox, conflictGeom, errorFtrLayers );
errorList << err;
}
return errorList;
}
