void QgsGeometryAnalyzer::convexFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry )
{
QgsGeometry* featureGeometry = f.geometry();
QgsGeometry* tmpGeometry = 0;
QgsGeometry* convexGeometry = 0;
if ( !featureGeometry )
{
return;
}
convexGeometry = featureGeometry->convexHull();
if ( nProcessedFeatures == 0 )
{
*dissolveGeometry = convexGeometry;
}
else
{
tmpGeometry = *dissolveGeometry;
*dissolveGeometry = ( *dissolveGeometry )->combine( convexGeometry );
delete tmpGeometry;
delete convexGeometry;
}
}
void QgsGeometryAnalyzer::convexFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry& dissolveGeometry )
{
if ( !f.hasGeometry() )
{
return;
}
QgsGeometry featureGeometry = f.geometry();
QgsGeometry convexGeometry = featureGeometry.convexHull();
if ( nProcessedFeatures == 0 )
{
dissolveGeometry = convexGeometry;
}
else
{
dissolveGeometry = dissolveGeometry.combine( convexGeometry );
}
}
bool QgsGeometryAnalyzer::convexHull( QgsVectorLayer* layer, const QString& shapefileName,
bool onlySelectedFeatures, int uniqueIdField, QProgressDialog* p )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
bool useField = false;
if ( uniqueIdField == -1 )
{
uniqueIdField = 0;
}
else
{
useField = true;
}
QgsFields fields;
fields.append( QgsField( QStringLiteral( "UID" ), QVariant::String ) );
fields.append( QgsField( QStringLiteral( "AREA" ), QVariant::Double ) );
fields.append( QgsField( QStringLiteral( "PERIM" ), QVariant::Double ) );
QgsWkbTypes::Type outputType = QgsWkbTypes::Polygon;
QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), fields, outputType, crs );
QgsFeature currentFeature;
QgsGeometry dissolveGeometry; //dissolve geometry
QMultiMap<QString, QgsFeatureId> map;
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
QgsFeatureIds::const_iterator it = selection.constBegin();
for ( ; it != selection.constEnd(); ++it )
{
#if 0
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
// break; // it may be better to do something else here?
return false;
}
#endif
if ( !layer->getFeatures( QgsFeatureRequest().setFilterFid( *it ) ).nextFeature( currentFeature ) )
{
continue;
}
map.insert( currentFeature.attribute( uniqueIdField ).toString(), currentFeature.id() );
}
}
else
{
QgsFeatureIterator fit = layer->getFeatures();
while ( fit.nextFeature( currentFeature ) )
{
#if 0
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
// break; // it may be better to do something else here?
return false;
}
#endif
map.insert( currentFeature.attribute( uniqueIdField ).toString(), currentFeature.id() );
}
}
QMultiMap<QString, QgsFeatureId>::const_iterator jt = map.constBegin();
while ( jt != map.constEnd() )
{
QString currentKey = jt.key();
int processedFeatures = 0;
//take only selection
if ( onlySelectedFeatures )
{
//use QgsVectorLayer::featureAtId
const QgsFeatureIds selection = layer->selectedFeaturesIds();
if ( p )
{
p->setMaximum( selection.size() );
}
processedFeatures = 0;
while ( jt != map.constEnd() && ( jt.key() == currentKey || !useField ) )
{
if ( p && p->wasCanceled() )
{
break;
}
if ( selection.contains( jt.value() ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( !layer->getFeatures( QgsFeatureRequest().setFilterFid( jt.value() ) ).nextFeature( currentFeature ) )
{
continue;
}
convexFeature( currentFeature, processedFeatures, dissolveGeometry );
++processedFeatures;
}
++jt;
}
QList<double> values;
if ( dissolveGeometry.isEmpty() )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveGeometry = dissolveGeometry.convexHull();
values = simpleMeasure( dissolveGeometry );
QgsAttributes attributes( 3 );
attributes[0] = QVariant( currentKey );
attributes[1] = values.at( 0 );
attributes[2] = values.at( 1 );
QgsFeature dissolveFeature;
dissolveFeature.setAttributes( attributes );
dissolveFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( dissolveFeature );
}
//take all features
else
{
int featureCount = layer->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
processedFeatures = 0;
while ( jt != map.constEnd() && ( jt.key() == currentKey || !useField ) )
{
if ( p )
{
p->setValue( processedFeatures );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !layer->getFeatures( QgsFeatureRequest().setFilterFid( jt.value() ) ).nextFeature( currentFeature ) )
{
continue;
}
convexFeature( currentFeature, processedFeatures, dissolveGeometry );
++processedFeatures;
++jt;
}
QList<double> values;
if ( dissolveGeometry.isEmpty() )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveGeometry = dissolveGeometry.convexHull();
// values = simpleMeasure( tmpGeometry );
values = simpleMeasure( dissolveGeometry );
QgsAttributes attributes;
attributes[0] = QVariant( currentKey );
attributes[1] = QVariant( values[ 0 ] );
attributes[2] = QVariant( values[ 1 ] );
QgsFeature dissolveFeature;
dissolveFeature.setAttributes( attributes );
dissolveFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( dissolveFeature );
}
}
return true;
}
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))" );
}
