void QgsRelationEditorWidget::addFeature()
{
QgsAttributeMap keyAttrs;
const QgsVectorLayerTools* vlTools = mEditorContext.vectorLayerTools();
if ( mNmRelation.isValid() )
{
// n:m Relation: first let the user create a new feature on the other table
// and autocreate a new linking feature.
QgsFeature f;
if ( vlTools->addFeature( mNmRelation.referencedLayer(), QgsAttributeMap(), QgsGeometry(), &f ) )
{
QgsFeature flink( mRelation.referencingLayer()->fields() ); // Linking feature
flink.setAttribute( mRelation.fieldPairs().at( 0 ).first, mFeature.attribute( mRelation.fieldPairs().at( 0 ).second ) );
flink.setAttribute( mNmRelation.referencingFields().at( 0 ), f.attribute( mNmRelation.referencedFields().at( 0 ) ) );
mRelation.referencingLayer()->addFeature( flink );
updateUi();
}
}
else
{
QgsFields fields = mRelation.referencingLayer()->fields();
Q_FOREACH ( const QgsRelation::FieldPair& fieldPair, mRelation.fieldPairs() )
{
keyAttrs.insert( fields.indexFromName( fieldPair.referencingField() ), mFeature.attribute( fieldPair.referencedField() ) );
}
vlTools->addFeature( mDualView->masterModel()->layer(), keyAttrs );
}
}
void QgsVectorLayerEditBuffer::updateAttributeMapIndex( QgsAttributeMap& map, int index, int offset ) const
{
QgsAttributeMap updatedMap;
for ( QgsAttributeMap::const_iterator it = map.begin(); it != map.end(); ++it )
{
int attrIndex = it.key();
updatedMap.insert( attrIndex < index ? attrIndex : attrIndex + offset, it.value() );
}
map = updatedMap;
}
QgsAttributeMap QgsAttributes::toMap() const
{
QgsAttributeMap map;
for ( int idx = 0; idx < count(); ++idx )
{
QVariant v = at( idx );
if ( v.isValid() )
map.insert( idx, v );
}
return map;
}
void QgsOverlayAnalyzer::combineAttributeMaps( QgsAttributeMap& attributeMapA, QgsAttributeMap attributeMapB )
{
QMap<int, QVariant>::const_iterator i = attributeMapB.constBegin();
QVariant attribute;
int fcount = attributeMapA.size();
while ( i != attributeMapB.constEnd() )
{
attribute = i.value();
attributeMapA.insert( fcount, attribute );
++i;
++fcount;
}
}
void QgsRelationEditorWidget::addFeature()
{
QgsAttributeMap keyAttrs;
const QgsVectorLayerTools *vlTools = mEditorContext.vectorLayerTools();
if ( mNmRelation.isValid() )
{
// n:m Relation: first let the user create a new feature on the other table
// and autocreate a new linking feature.
QgsFeature f;
if ( vlTools->addFeature( mNmRelation.referencedLayer(), QgsAttributeMap(), QgsGeometry(), &f ) )
{
// Fields of the linking table
const QgsFields fields = mRelation.referencingLayer()->fields();
// Expression context for the linking table
QgsExpressionContext context = mRelation.referencingLayer()->createExpressionContext();
QgsAttributeMap linkAttributes;
Q_FOREACH ( const QgsRelation::FieldPair &fieldPair, mRelation.fieldPairs() )
{
int index = fields.indexOf( fieldPair.first );
linkAttributes.insert( index, mFeature.attribute( fieldPair.second ) );
}
Q_FOREACH ( const QgsRelation::FieldPair &fieldPair, mNmRelation.fieldPairs() )
{
int index = fields.indexOf( fieldPair.first );
linkAttributes.insert( index, f.attribute( fieldPair.second ) );
}
QgsFeature linkFeature = QgsVectorLayerUtils::createFeature( mRelation.referencingLayer(), QgsGeometry(), linkAttributes, &context );
mRelation.referencingLayer()->addFeature( linkFeature );
updateUi();
}
}
bool QgsComposerTextTable::getFeatureAttributes( QList<QgsAttributeMap>& attributes )
{
attributes.clear();
QList< QStringList >::const_iterator rowIt = mRowText.constBegin();
QStringList currentStringList;
for ( ; rowIt != mRowText.constEnd(); ++rowIt )
{
currentStringList = *rowIt;
QgsAttributeMap map;
for ( int i = 0; i < currentStringList.size(); ++i )
{
map.insert( i, QVariant( currentStringList.at( i ) ) );
}
attributes.append( map );
}
return true;
}
void QgsFeaturePool::updateFeature( QgsFeature& feature )
{
QgsGeometryMap geometryMap;
geometryMap.insert( feature.id(), QgsGeometry( feature.geometry()->geometry()->clone() ) );
QgsChangedAttributesMap changedAttributesMap;
QgsAttributeMap attribMap;
for ( int i = 0, n = feature.attributes().size(); i < n; ++i )
{
attribMap.insert( i, feature.attributes().at( i ) );
}
changedAttributesMap.insert( feature.id(), attribMap );
mLayerMutex.lock();
mFeatureCache.remove( feature.id() ); // Remove to force reload on next get()
mLayer->dataProvider()->changeGeometryValues( geometryMap );
mLayer->dataProvider()->changeAttributeValues( changedAttributesMap );
mLayerMutex.unlock();
mIndexMutex.lock();
mIndex.deleteFeature( feature );
mIndex.insertFeature( feature );
mIndexMutex.unlock();
}
QgsAttributeMap QgsMergeAttributesDialog::mergedAttributesMap() const
{
if ( mFeatureList.size() < 1 )
{
return QgsAttributeMap();
}
QgsAttributeMap resultMap;
for ( int i = 0; i < mTableWidget->columnCount(); i++ )
{
int idx = mTableWidget->horizontalHeaderItem( i )->data( Qt::UserRole ).toInt();
QTableWidgetItem* currentItem = mTableWidget->item( mFeatureList.size() + 1, i );
if ( !currentItem )
continue;
resultMap.insert( idx, currentItem->text() );
}
return resultMap;
}
void QgsOfflineEditing::applyFeaturesAdded( QgsVectorLayer* offlineLayer, QgsVectorLayer* remoteLayer, sqlite3* db, int layerId )
{
QString sql = QString( "SELECT \"fid\" FROM 'log_added_features' WHERE \"layer_id\" = %1" ).arg( layerId );
QList<int> newFeatureIds = sqlQueryInts( db, sql );
// get new features from offline layer
QgsFeatureList features;
for ( int i = 0; i < newFeatureIds.size(); i++ )
{
QgsFeature feature;
if ( offlineLayer->featureAtId( newFeatureIds.at( i ), feature, true, true ) )
{
features << feature;
}
}
// copy features to remote layer
mProgressDialog->setupProgressBar( tr( "%v / %m features added" ), features.size() );
int i = 1;
for ( QgsFeatureList::iterator it = features.begin(); it != features.end(); ++it )
{
QgsFeature f = *it;
// NOTE: Spatialite provider ignores position of geometry column
// restore gap in QgsAttributeMap if geometry column is not last (WORKAROUND)
QMap<int, int> attrLookup = attributeLookup( offlineLayer, remoteLayer );
QgsAttributeMap newAttrMap;
QgsAttributeMap attrMap = f.attributeMap();
for ( QgsAttributeMap::const_iterator it = attrMap.begin(); it != attrMap.end(); ++it )
{
newAttrMap.insert( attrLookup[ it.key()], it.value() );
}
f.setAttributeMap( newAttrMap );
remoteLayer->addFeature( f, false );
mProgressDialog->setProgressValue( i++ );
}
}
void QgsRelationReferenceWidget::addEntry()
{
QgsFeature f( mReferencedLayer->fields() );
QgsAttributeMap attributes;
// if custom text is in the combobox and the displayExpression is simply a field, use the current text for the new feature
if ( mComboBox->itemText( mComboBox->currentIndex() ) != mComboBox->currentText() )
{
int fieldIdx = mReferencedLayer->fields().lookupField( mReferencedLayer->displayExpression() );
if ( fieldIdx != -1 )
{
attributes.insert( fieldIdx, mComboBox->currentText() );
}
}
if ( mEditorContext.vectorLayerTools()->addFeature( mReferencedLayer, attributes, QgsGeometry(), &f ) )
{
mComboBox->setIdentifierValue( f.attribute( mReferencingFieldIdx ) );
mAddEntryButton->setEnabled( false );
}
}
/*!
\fn OptVectorLayer:: changeAttribute(QgsFeature& feature, int field, QVariant attr)
*/
bool OptVectorLayer:: changeAttribute(QgsFeature& feature, int field, QVariant attr)
{
if ( !isEditable() )
{
startEditing();
}
if ( isModified() )
{
commitChanges();
}
QgsChangedAttributesMap attributeChanges;
QgsAttributeMap newAttMap;
newAttMap.insert(field, attr );
attributeChanges.insert(feature.id(), newAttMap);
//{zhangliye2715} ;api changed
// commitAttributeChanges(QgsAttributeIds(),
// QgsNewAttributesMap(),
// attributeChanges);
dataProvider()->changeAttributeValues(attributeChanges);
//commit or rollBack the change
if ( isModified() )
{
commitChanges();
}
else
{
rollBack();
return false;
}
//make the layer still editable for the next adding operation
startEditing();
return true;
}
void QgsOfflineEditing::copyVectorLayer( QgsVectorLayer* layer, sqlite3* db, const QString& offlineDbPath )
{
if ( layer == NULL )
{
return;
}
QString tableName = layer->name();
// create table
QString sql = QString( "CREATE TABLE '%1' (" ).arg( tableName );
QString delim = "";
const QgsFieldMap& fields = layer->dataProvider()->fields();
for ( QgsFieldMap::const_iterator it = fields.begin(); it != fields.end() ; ++it )
{
QString dataType = "";
QVariant::Type type = it.value().type();
if ( type == QVariant::Int )
{
dataType = "INTEGER";
}
else if ( type == QVariant::Double )
{
dataType = "REAL";
}
else if ( type == QVariant::String )
{
dataType = "TEXT";
}
else
{
showWarning( tr( "Unknown data type %1" ).arg( type ) );
}
sql += delim + QString( "'%1' %2" ).arg( it.value().name() ).arg( dataType );
delim = ",";
}
sql += ")";
// add geometry column
QString geomType = "";
switch ( layer->wkbType() )
{
case QGis::WKBPoint:
geomType = "POINT";
break;
case QGis::WKBMultiPoint:
geomType = "MULTIPOINT";
break;
case QGis::WKBLineString:
geomType = "LINESTRING";
break;
case QGis::WKBMultiLineString:
geomType = "MULTILINESTRING";
break;
case QGis::WKBPolygon:
geomType = "POLYGON";
break;
case QGis::WKBMultiPolygon:
geomType = "MULTIPOLYGON";
break;
default:
showWarning( tr( "QGIS wkbType %1 not supported" ).arg( layer->wkbType() ) );
break;
};
QString sqlAddGeom = QString( "SELECT AddGeometryColumn('%1', 'Geometry', %2, '%3', 2)" )
.arg( tableName )
.arg( layer->crs().authid().startsWith( "EPSG:", Qt::CaseInsensitive ) ? layer->crs().authid().mid( 5 ).toLong() : 0 )
.arg( geomType );
// create spatial index
QString sqlCreateIndex = QString( "SELECT CreateSpatialIndex('%1', 'Geometry')" ).arg( tableName );
int rc = sqlExec( db, sql );
if ( rc == SQLITE_OK )
{
rc = sqlExec( db, sqlAddGeom );
if ( rc == SQLITE_OK )
{
rc = sqlExec( db, sqlCreateIndex );
}
}
if ( rc == SQLITE_OK )
{
// add new layer
QgsVectorLayer* newLayer = new QgsVectorLayer( QString( "dbname='%1' table='%2'(Geometry) sql=" )
.arg( offlineDbPath ).arg( tableName ), tableName + " (offline)", "spatialite" );
if ( newLayer->isValid() )
{
// mark as offline layer
newLayer->setCustomProperty( CUSTOM_PROPERTY_IS_OFFLINE_EDITABLE, true );
// store original layer source
newLayer->setCustomProperty( CUSTOM_PROPERTY_REMOTE_SOURCE, layer->source() );
newLayer->setCustomProperty( CUSTOM_PROPERTY_REMOTE_PROVIDER, layer->providerType() );
// copy style
bool hasLabels = layer->hasLabelsEnabled();
if ( !hasLabels )
{
// NOTE: copy symbology before adding the layer so it is displayed correctly
copySymbology( layer, newLayer );
}
// register this layer with the central layers registry
QgsMapLayerRegistry::instance()->addMapLayer( newLayer );
if ( hasLabels )
{
// NOTE: copy symbology of layers with labels enabled after adding to project, as it will crash otherwise (WORKAROUND)
copySymbology( layer, newLayer );
}
// TODO: layer order
// copy features
newLayer->startEditing();
QgsFeature f;
// NOTE: force feature recount for PostGIS layer, else only visible features are counted, before iterating over all features (WORKAROUND)
layer->setSubsetString( "" );
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
mProgressDialog->setupProgressBar( tr( "%v / %m features copied" ), layer->featureCount() );
int featureCount = 1;
QList<int> remoteFeatureIds;
while ( layer->nextFeature( f ) )
{
remoteFeatureIds << f.id();
// NOTE: Spatialite provider ignores position of geometry column
// fill gap in QgsAttributeMap if geometry column is not last (WORKAROUND)
int column = 0;
QgsAttributeMap newAttrMap;
QgsAttributeMap attrMap = f.attributeMap();
for ( QgsAttributeMap::const_iterator it = attrMap.begin(); it != attrMap.end(); ++it )
{
newAttrMap.insert( column++, it.value() );
}
f.setAttributeMap( newAttrMap );
newLayer->addFeature( f, false );
mProgressDialog->setProgressValue( featureCount++ );
}
if ( newLayer->commitChanges() )
{
mProgressDialog->setupProgressBar( tr( "%v / %m features processed" ), layer->featureCount() );
featureCount = 1;
// update feature id lookup
int layerId = getOrCreateLayerId( db, newLayer->id() );
QList<int> offlineFeatureIds;
newLayer->select( QgsAttributeList(), QgsRectangle(), false, false );
while ( newLayer->nextFeature( f ) )
{
offlineFeatureIds << f.id();
}
// NOTE: insert fids in this loop, as the db is locked during newLayer->nextFeature()
sqlExec( db, "BEGIN" );
for ( int i = 0; i < remoteFeatureIds.size(); i++ )
{
addFidLookup( db, layerId, offlineFeatureIds.at( i ), remoteFeatureIds.at( i ) );
mProgressDialog->setProgressValue( featureCount++ );
}
sqlExec( db, "COMMIT" );
}
else
{
showWarning( newLayer->commitErrors().join( "\n" ) );
}
// remove remote layer
QgsMapLayerRegistry::instance()->removeMapLayer( layer->id() );
}
}
}
int QgsZonalStatistics::calculateStatistics( QgsFeedback *feedback )
{
if ( !mPolygonLayer || mPolygonLayer->geometryType() != QgsWkbTypes::PolygonGeometry )
{
return 1;
}
QgsVectorDataProvider *vectorProvider = mPolygonLayer->dataProvider();
if ( !vectorProvider )
{
return 2;
}
if ( !mRasterLayer )
{
return 3;
}
if ( mRasterLayer->bandCount() < mRasterBand )
{
return 4;
}
mRasterProvider = mRasterLayer->dataProvider();
mInputNodataValue = mRasterProvider->sourceNoDataValue( mRasterBand );
//get geometry info about raster layer
int nCellsXProvider = mRasterProvider->xSize();
int nCellsYProvider = mRasterProvider->ySize();
double cellsizeX = mRasterLayer->rasterUnitsPerPixelX();
if ( cellsizeX < 0 )
{
cellsizeX = -cellsizeX;
}
double cellsizeY = mRasterLayer->rasterUnitsPerPixelY();
if ( cellsizeY < 0 )
{
cellsizeY = -cellsizeY;
}
QgsRectangle rasterBBox = mRasterProvider->extent();
//add the new fields to the provider
QList<QgsField> newFieldList;
QString countFieldName;
if ( mStatistics & QgsZonalStatistics::Count )
{
countFieldName = getUniqueFieldName( mAttributePrefix + "count", newFieldList );
QgsField countField( countFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( countField );
}
QString sumFieldName;
if ( mStatistics & QgsZonalStatistics::Sum )
{
sumFieldName = getUniqueFieldName( mAttributePrefix + "sum", newFieldList );
QgsField sumField( sumFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( sumField );
}
QString meanFieldName;
if ( mStatistics & QgsZonalStatistics::Mean )
{
meanFieldName = getUniqueFieldName( mAttributePrefix + "mean", newFieldList );
QgsField meanField( meanFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( meanField );
}
QString medianFieldName;
if ( mStatistics & QgsZonalStatistics::Median )
{
medianFieldName = getUniqueFieldName( mAttributePrefix + "median", newFieldList );
QgsField medianField( medianFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( medianField );
}
QString stdevFieldName;
if ( mStatistics & QgsZonalStatistics::StDev )
{
stdevFieldName = getUniqueFieldName( mAttributePrefix + "stdev", newFieldList );
QgsField stdField( stdevFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( stdField );
}
QString minFieldName;
if ( mStatistics & QgsZonalStatistics::Min )
{
minFieldName = getUniqueFieldName( mAttributePrefix + "min", newFieldList );
QgsField minField( minFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( minField );
}
QString maxFieldName;
if ( mStatistics & QgsZonalStatistics::Max )
{
maxFieldName = getUniqueFieldName( mAttributePrefix + "max", newFieldList );
QgsField maxField( maxFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( maxField );
}
QString rangeFieldName;
if ( mStatistics & QgsZonalStatistics::Range )
{
rangeFieldName = getUniqueFieldName( mAttributePrefix + "range", newFieldList );
QgsField rangeField( rangeFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( rangeField );
}
QString minorityFieldName;
if ( mStatistics & QgsZonalStatistics::Minority )
{
minorityFieldName = getUniqueFieldName( mAttributePrefix + "minority", newFieldList );
QgsField minorityField( minorityFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( minorityField );
}
QString majorityFieldName;
if ( mStatistics & QgsZonalStatistics::Majority )
{
majorityFieldName = getUniqueFieldName( mAttributePrefix + "majority", newFieldList );
QgsField majField( majorityFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( majField );
}
QString varietyFieldName;
if ( mStatistics & QgsZonalStatistics::Variety )
{
varietyFieldName = getUniqueFieldName( mAttributePrefix + "variety", newFieldList );
QgsField varietyField( varietyFieldName, QVariant::Int, QStringLiteral( "int" ) );
newFieldList.push_back( varietyField );
}
QString varianceFieldName;
if ( mStatistics & QgsZonalStatistics::Variance )
{
varianceFieldName = getUniqueFieldName( mAttributePrefix + "variance", newFieldList );
QgsField varianceField( varianceFieldName, QVariant::Double, QStringLiteral( "double precision" ) );
newFieldList.push_back( varianceField );
}
vectorProvider->addAttributes( newFieldList );
//index of the new fields
int countIndex = mStatistics & QgsZonalStatistics::Count ? vectorProvider->fieldNameIndex( countFieldName ) : -1;
int sumIndex = mStatistics & QgsZonalStatistics::Sum ? vectorProvider->fieldNameIndex( sumFieldName ) : -1;
int meanIndex = mStatistics & QgsZonalStatistics::Mean ? vectorProvider->fieldNameIndex( meanFieldName ) : -1;
int medianIndex = mStatistics & QgsZonalStatistics::Median ? vectorProvider->fieldNameIndex( medianFieldName ) : -1;
int stdevIndex = mStatistics & QgsZonalStatistics::StDev ? vectorProvider->fieldNameIndex( stdevFieldName ) : -1;
int minIndex = mStatistics & QgsZonalStatistics::Min ? vectorProvider->fieldNameIndex( minFieldName ) : -1;
int maxIndex = mStatistics & QgsZonalStatistics::Max ? vectorProvider->fieldNameIndex( maxFieldName ) : -1;
int rangeIndex = mStatistics & QgsZonalStatistics::Range ? vectorProvider->fieldNameIndex( rangeFieldName ) : -1;
int minorityIndex = mStatistics & QgsZonalStatistics::Minority ? vectorProvider->fieldNameIndex( minorityFieldName ) : -1;
int majorityIndex = mStatistics & QgsZonalStatistics::Majority ? vectorProvider->fieldNameIndex( majorityFieldName ) : -1;
int varietyIndex = mStatistics & QgsZonalStatistics::Variety ? vectorProvider->fieldNameIndex( varietyFieldName ) : -1;
int varianceIndex = mStatistics & QgsZonalStatistics::Variance ? vectorProvider->fieldNameIndex( varianceFieldName ) : -1;
if ( ( mStatistics & QgsZonalStatistics::Count && countIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Sum && sumIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Mean && meanIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Median && medianIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::StDev && stdevIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Min && minIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Max && maxIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Range && rangeIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Minority && minorityIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Majority && majorityIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Variety && varietyIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Variance && varianceIndex == -1 )
)
{
//failed to create a required field
return 8;
}
//progress dialog
long featureCount = vectorProvider->featureCount();
//iterate over each polygon
QgsFeatureRequest request;
request.setSubsetOfAttributes( QgsAttributeList() );
QgsFeatureIterator fi = vectorProvider->getFeatures( request );
QgsFeature f;
bool statsStoreValues = ( mStatistics & QgsZonalStatistics::Median ) ||
( mStatistics & QgsZonalStatistics::StDev ) ||
( mStatistics & QgsZonalStatistics::Variance );
bool statsStoreValueCount = ( mStatistics & QgsZonalStatistics::Minority ) ||
( mStatistics & QgsZonalStatistics::Majority );
FeatureStats featureStats( statsStoreValues, statsStoreValueCount );
int featureCounter = 0;
QgsChangedAttributesMap changeMap;
while ( fi.nextFeature( f ) )
{
if ( feedback && feedback->isCanceled() )
{
break;
}
if ( feedback )
{
feedback->setProgress( 100.0 * static_cast< double >( featureCounter ) / featureCount );
}
if ( !f.hasGeometry() )
{
++featureCounter;
continue;
}
QgsGeometry featureGeometry = f.geometry();
QgsRectangle featureRect = featureGeometry.boundingBox().intersect( &rasterBBox );
if ( featureRect.isEmpty() )
{
++featureCounter;
continue;
}
int offsetX, offsetY, nCellsX, nCellsY;
if ( cellInfoForBBox( rasterBBox, featureRect, cellsizeX, cellsizeY, offsetX, offsetY, nCellsX, nCellsY ) != 0 )
{
++featureCounter;
continue;
}
//avoid access to cells outside of the raster (may occur because of rounding)
if ( ( offsetX + nCellsX ) > nCellsXProvider )
{
nCellsX = nCellsXProvider - offsetX;
}
if ( ( offsetY + nCellsY ) > nCellsYProvider )
{
nCellsY = nCellsYProvider - offsetY;
}
statisticsFromMiddlePointTest( featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, featureStats );
if ( featureStats.count <= 1 )
{
//the cell resolution is probably larger than the polygon area. We switch to precise pixel - polygon intersection in this case
statisticsFromPreciseIntersection( featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, featureStats );
}
//write the statistics value to the vector data provider
QgsAttributeMap changeAttributeMap;
if ( mStatistics & QgsZonalStatistics::Count )
changeAttributeMap.insert( countIndex, QVariant( featureStats.count ) );
if ( mStatistics & QgsZonalStatistics::Sum )
changeAttributeMap.insert( sumIndex, QVariant( featureStats.sum ) );
if ( featureStats.count > 0 )
{
double mean = featureStats.sum / featureStats.count;
if ( mStatistics & QgsZonalStatistics::Mean )
changeAttributeMap.insert( meanIndex, QVariant( mean ) );
if ( mStatistics & QgsZonalStatistics::Median )
{
std::sort( featureStats.values.begin(), featureStats.values.end() );
int size = featureStats.values.count();
bool even = ( size % 2 ) < 1;
double medianValue;
if ( even )
{
medianValue = ( featureStats.values.at( size / 2 - 1 ) + featureStats.values.at( size / 2 ) ) / 2;
}
else //odd
{
medianValue = featureStats.values.at( ( size + 1 ) / 2 - 1 );
}
changeAttributeMap.insert( medianIndex, QVariant( medianValue ) );
}
if ( mStatistics & QgsZonalStatistics::StDev || mStatistics & QgsZonalStatistics::Variance )
{
double sumSquared = 0;
for ( int i = 0; i < featureStats.values.count(); ++i )
{
double diff = featureStats.values.at( i ) - mean;
sumSquared += diff * diff;
}
double variance = sumSquared / featureStats.values.count();
if ( mStatistics & QgsZonalStatistics::StDev )
{
double stdev = std::pow( variance, 0.5 );
changeAttributeMap.insert( stdevIndex, QVariant( stdev ) );
}
if ( mStatistics & QgsZonalStatistics::Variance )
changeAttributeMap.insert( varianceIndex, QVariant( variance ) );
}
if ( mStatistics & QgsZonalStatistics::Min )
changeAttributeMap.insert( minIndex, QVariant( featureStats.min ) );
if ( mStatistics & QgsZonalStatistics::Max )
changeAttributeMap.insert( maxIndex, QVariant( featureStats.max ) );
if ( mStatistics & QgsZonalStatistics::Range )
changeAttributeMap.insert( rangeIndex, QVariant( featureStats.max - featureStats.min ) );
if ( mStatistics & QgsZonalStatistics::Minority || mStatistics & QgsZonalStatistics::Majority )
{
QList<int> vals = featureStats.valueCount.values();
std::sort( vals.begin(), vals.end() );
if ( mStatistics & QgsZonalStatistics::Minority )
{
float minorityKey = featureStats.valueCount.key( vals.first() );
changeAttributeMap.insert( minorityIndex, QVariant( minorityKey ) );
}
if ( mStatistics & QgsZonalStatistics::Majority )
{
float majKey = featureStats.valueCount.key( vals.last() );
changeAttributeMap.insert( majorityIndex, QVariant( majKey ) );
}
}
if ( mStatistics & QgsZonalStatistics::Variety )
changeAttributeMap.insert( varietyIndex, QVariant( featureStats.valueCount.count() ) );
}
changeMap.insert( f.id(), changeAttributeMap );
++featureCounter;
}
vectorProvider->changeAttributeValues( changeMap );
if ( feedback )
{
feedback->setProgress( 100 );
}
mPolygonLayer->updateFields();
if ( feedback && feedback->isCanceled() )
{
return 9;
}
return 0;
}
int QgsZonalStatistics::calculateStatistics( QProgressDialog* p )
{
if ( !mPolygonLayer || mPolygonLayer->geometryType() != QGis::Polygon )
{
return 1;
}
QgsVectorDataProvider* vectorProvider = mPolygonLayer->dataProvider();
if ( !vectorProvider )
{
return 2;
}
//open the raster layer and the raster band
GDALAllRegister();
GDALDatasetH inputDataset = GDALOpen( mRasterFilePath.toLocal8Bit().data(), GA_ReadOnly );
if ( inputDataset == NULL )
{
return 3;
}
if ( GDALGetRasterCount( inputDataset ) < ( mRasterBand - 1 ) )
{
GDALClose( inputDataset );
return 4;
}
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, mRasterBand );
if ( rasterBand == NULL )
{
GDALClose( inputDataset );
return 5;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, NULL );
//get geometry info about raster layer
int nCellsX = GDALGetRasterXSize( inputDataset );
int nCellsY = GDALGetRasterYSize( inputDataset );
double geoTransform[6];
if ( GDALGetGeoTransform( inputDataset, geoTransform ) != CE_None )
{
GDALClose( inputDataset );
return 6;
}
double cellsizeX = geoTransform[1];
if ( cellsizeX < 0 )
{
cellsizeX = -cellsizeX;
}
double cellsizeY = geoTransform[5];
if ( cellsizeY < 0 )
{
cellsizeY = -cellsizeY;
}
QgsRectangle rasterBBox( geoTransform[0], geoTransform[3] - ( nCellsY * cellsizeY ), geoTransform[0] + ( nCellsX * cellsizeX ), geoTransform[3] );
//add the new count, sum, mean fields to the provider
QList<QgsField> newFieldList;
QgsField countField( mAttributePrefix + "count", QVariant::Double );
QgsField sumField( mAttributePrefix + "sum", QVariant::Double );
QgsField meanField( mAttributePrefix + "mean", QVariant::Double );
newFieldList.push_back( countField );
newFieldList.push_back( sumField );
newFieldList.push_back( meanField );
if ( !vectorProvider->addAttributes( newFieldList ) )
{
return 7;
}
//index of the new fields
int countIndex = vectorProvider->fieldNameIndex( mAttributePrefix + "count" );
int sumIndex = vectorProvider->fieldNameIndex( mAttributePrefix + "sum" );
int meanIndex = vectorProvider->fieldNameIndex( mAttributePrefix + "mean" );
if ( countIndex == -1 || sumIndex == -1 || meanIndex == -1 )
{
return 8;
}
//progress dialog
long featureCount = vectorProvider->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
//iterate over each polygon
vectorProvider->select( QgsAttributeList(), QgsRectangle(), true, false );
vectorProvider->rewind();
QgsFeature f;
double count = 0;
double sum = 0;
double mean = 0;
int featureCounter = 0;
while ( vectorProvider->nextFeature( f ) )
{
qWarning( "%d", featureCounter );
if ( p )
{
p->setValue( featureCounter );
}
if ( p && p->wasCanceled() )
{
break;
}
QgsGeometry* featureGeometry = f.geometry();
if ( !featureGeometry )
{
++featureCounter;
continue;
}
int offsetX, offsetY, nCellsX, nCellsY;
if ( cellInfoForBBox( rasterBBox, featureGeometry->boundingBox(), cellsizeX, cellsizeY, offsetX, offsetY, nCellsX, nCellsY ) != 0 )
{
++featureCounter;
continue;
}
statisticsFromMiddlePointTest_improved( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, sum, count );
if ( count <= 1 )
{
//the cell resolution is probably larger than the polygon area. We switch to precise pixel - polygon intersection in this case
statisticsFromPreciseIntersection( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, sum, count );
}
if ( count == 0 )
{
mean = 0;
}
else
{
mean = sum / count;
}
//write the statistics value to the vector data provider
QgsChangedAttributesMap changeMap;
QgsAttributeMap changeAttributeMap;
changeAttributeMap.insert( countIndex, QVariant( count ) );
changeAttributeMap.insert( sumIndex, QVariant( sum ) );
changeAttributeMap.insert( meanIndex, QVariant( mean ) );
changeMap.insert( f.id(), changeAttributeMap );
vectorProvider->changeAttributeValues( changeMap );
++featureCounter;
}
if ( p )
{
p->setValue( featureCount );
}
GDALClose( inputDataset );
return 0;
}
int QgsZonalStatistics::calculateStatistics( QProgressDialog* p )
{
if ( !mPolygonLayer || mPolygonLayer->geometryType() != QGis::Polygon )
{
return 1;
}
QgsVectorDataProvider* vectorProvider = mPolygonLayer->dataProvider();
if ( !vectorProvider )
{
return 2;
}
//open the raster layer and the raster band
GDALAllRegister();
GDALDatasetH inputDataset = GDALOpen( TO8F( mRasterFilePath ), GA_ReadOnly );
if ( !inputDataset )
{
return 3;
}
if ( GDALGetRasterCount( inputDataset ) < ( mRasterBand - 1 ) )
{
GDALClose( inputDataset );
return 4;
}
GDALRasterBandH rasterBand = GDALGetRasterBand( inputDataset, mRasterBand );
if ( !rasterBand )
{
GDALClose( inputDataset );
return 5;
}
mInputNodataValue = GDALGetRasterNoDataValue( rasterBand, nullptr );
//get geometry info about raster layer
int nCellsXGDAL = GDALGetRasterXSize( inputDataset );
int nCellsYGDAL = GDALGetRasterYSize( inputDataset );
double geoTransform[6];
if ( GDALGetGeoTransform( inputDataset, geoTransform ) != CE_None )
{
GDALClose( inputDataset );
return 6;
}
double cellsizeX = geoTransform[1];
if ( cellsizeX < 0 )
{
cellsizeX = -cellsizeX;
}
double cellsizeY = geoTransform[5];
if ( cellsizeY < 0 )
{
cellsizeY = -cellsizeY;
}
QgsRectangle rasterBBox( geoTransform[0], geoTransform[3] - ( nCellsYGDAL * cellsizeY ),
geoTransform[0] + ( nCellsXGDAL * cellsizeX ), geoTransform[3] );
//add the new fields to the provider
QList<QgsField> newFieldList;
QString countFieldName;
if ( mStatistics & QgsZonalStatistics::Count )
{
countFieldName = getUniqueFieldName( mAttributePrefix + "count" );
QgsField countField( countFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( countField );
}
QString sumFieldName;
if ( mStatistics & QgsZonalStatistics::Sum )
{
sumFieldName = getUniqueFieldName( mAttributePrefix + "sum" );
QgsField sumField( sumFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( sumField );
}
QString meanFieldName;
if ( mStatistics & QgsZonalStatistics::Mean )
{
meanFieldName = getUniqueFieldName( mAttributePrefix + "mean" );
QgsField meanField( meanFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( meanField );
}
QString medianFieldName;
if ( mStatistics & QgsZonalStatistics::Median )
{
medianFieldName = getUniqueFieldName( mAttributePrefix + "median" );
QgsField medianField( medianFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( medianField );
}
QString stdevFieldName;
if ( mStatistics & QgsZonalStatistics::StDev )
{
stdevFieldName = getUniqueFieldName( mAttributePrefix + "stdev" );
QgsField stdField( stdevFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( stdField );
}
QString minFieldName;
if ( mStatistics & QgsZonalStatistics::Min )
{
minFieldName = getUniqueFieldName( mAttributePrefix + "min" );
QgsField minField( minFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( minField );
}
QString maxFieldName;
if ( mStatistics & QgsZonalStatistics::Max )
{
maxFieldName = getUniqueFieldName( mAttributePrefix + "max" );
QgsField maxField( maxFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( maxField );
}
QString rangeFieldName;
if ( mStatistics & QgsZonalStatistics::Range )
{
rangeFieldName = getUniqueFieldName( mAttributePrefix + "range" );
QgsField rangeField( rangeFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( rangeField );
}
QString minorityFieldName;
if ( mStatistics & QgsZonalStatistics::Minority )
{
minorityFieldName = getUniqueFieldName( mAttributePrefix + "minority" );
QgsField minorityField( minorityFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( minorityField );
}
QString majorityFieldName;
if ( mStatistics & QgsZonalStatistics::Majority )
{
majorityFieldName = getUniqueFieldName( mAttributePrefix + "majority" );
QgsField majField( majorityFieldName, QVariant::Double, "double precision" );
newFieldList.push_back( majField );
}
QString varietyFieldName;
if ( mStatistics & QgsZonalStatistics::Variety )
{
varietyFieldName = getUniqueFieldName( mAttributePrefix + "variety" );
QgsField varietyField( varietyFieldName, QVariant::Int, "int" );
newFieldList.push_back( varietyField );
}
vectorProvider->addAttributes( newFieldList );
//index of the new fields
int countIndex = mStatistics & QgsZonalStatistics::Count ? vectorProvider->fieldNameIndex( countFieldName ) : -1;
int sumIndex = mStatistics & QgsZonalStatistics::Sum ? vectorProvider->fieldNameIndex( sumFieldName ) : -1;
int meanIndex = mStatistics & QgsZonalStatistics::Mean ? vectorProvider->fieldNameIndex( meanFieldName ) : -1;
int medianIndex = mStatistics & QgsZonalStatistics::Median ? vectorProvider->fieldNameIndex( medianFieldName ) : -1;
int stdevIndex = mStatistics & QgsZonalStatistics::StDev ? vectorProvider->fieldNameIndex( stdevFieldName ) : -1;
int minIndex = mStatistics & QgsZonalStatistics::Min ? vectorProvider->fieldNameIndex( minFieldName ) : -1;
int maxIndex = mStatistics & QgsZonalStatistics::Max ? vectorProvider->fieldNameIndex( maxFieldName ) : -1;
int rangeIndex = mStatistics & QgsZonalStatistics::Range ? vectorProvider->fieldNameIndex( rangeFieldName ) : -1;
int minorityIndex = mStatistics & QgsZonalStatistics::Minority ? vectorProvider->fieldNameIndex( minorityFieldName ) : -1;
int majorityIndex = mStatistics & QgsZonalStatistics::Majority ? vectorProvider->fieldNameIndex( majorityFieldName ) : -1;
int varietyIndex = mStatistics & QgsZonalStatistics::Variety ? vectorProvider->fieldNameIndex( varietyFieldName ) : -1;
if (( mStatistics & QgsZonalStatistics::Count && countIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Sum && sumIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Mean && meanIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Median && medianIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::StDev && stdevIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Min && minIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Max && maxIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Range && rangeIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Minority && minorityIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Majority && majorityIndex == -1 )
|| ( mStatistics & QgsZonalStatistics::Variety && varietyIndex == -1 )
)
{
//failed to create a required field
return 8;
}
//progress dialog
long featureCount = vectorProvider->featureCount();
if ( p )
{
p->setMaximum( featureCount );
}
//iterate over each polygon
QgsFeatureRequest request;
request.setSubsetOfAttributes( QgsAttributeList() );
QgsFeatureIterator fi = vectorProvider->getFeatures( request );
QgsFeature f;
bool statsStoreValues = ( mStatistics & QgsZonalStatistics::Median ) ||
( mStatistics & QgsZonalStatistics::StDev );
bool statsStoreValueCount = ( mStatistics & QgsZonalStatistics::Minority ) ||
( mStatistics & QgsZonalStatistics::Majority );
FeatureStats featureStats( statsStoreValues, statsStoreValueCount );
int featureCounter = 0;
QgsChangedAttributesMap changeMap;
while ( fi.nextFeature( f ) )
{
if ( p )
{
p->setValue( featureCounter );
}
if ( p && p->wasCanceled() )
{
break;
}
if ( !f.constGeometry() )
{
++featureCounter;
continue;
}
const QgsGeometry* featureGeometry = f.constGeometry();
QgsRectangle featureRect = featureGeometry->boundingBox().intersect( &rasterBBox );
if ( featureRect.isEmpty() )
{
++featureCounter;
continue;
}
int offsetX, offsetY, nCellsX, nCellsY;
if ( cellInfoForBBox( rasterBBox, featureRect, cellsizeX, cellsizeY, offsetX, offsetY, nCellsX, nCellsY ) != 0 )
{
++featureCounter;
continue;
}
//avoid access to cells outside of the raster (may occur because of rounding)
if (( offsetX + nCellsX ) > nCellsXGDAL )
{
nCellsX = nCellsXGDAL - offsetX;
}
if (( offsetY + nCellsY ) > nCellsYGDAL )
{
nCellsY = nCellsYGDAL - offsetY;
}
statisticsFromMiddlePointTest( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, featureStats );
if ( featureStats.count <= 1 )
{
//the cell resolution is probably larger than the polygon area. We switch to precise pixel - polygon intersection in this case
statisticsFromPreciseIntersection( rasterBand, featureGeometry, offsetX, offsetY, nCellsX, nCellsY, cellsizeX, cellsizeY,
rasterBBox, featureStats );
}
//write the statistics value to the vector data provider
QgsAttributeMap changeAttributeMap;
if ( mStatistics & QgsZonalStatistics::Count )
changeAttributeMap.insert( countIndex, QVariant( featureStats.count ) );
if ( mStatistics & QgsZonalStatistics::Sum )
changeAttributeMap.insert( sumIndex, QVariant( featureStats.sum ) );
if ( featureStats.count > 0 )
{
double mean = featureStats.sum / featureStats.count;
if ( mStatistics & QgsZonalStatistics::Mean )
changeAttributeMap.insert( meanIndex, QVariant( mean ) );
if ( mStatistics & QgsZonalStatistics::Median )
{
qSort( featureStats.values.begin(), featureStats.values.end() );
int size = featureStats.values.count();
bool even = ( size % 2 ) < 1;
double medianValue;
if ( even )
{
medianValue = ( featureStats.values.at( size / 2 - 1 ) + featureStats.values.at( size / 2 ) ) / 2;
}
else //odd
{
medianValue = featureStats.values.at(( size + 1 ) / 2 - 1 );
}
changeAttributeMap.insert( medianIndex, QVariant( medianValue ) );
}
if ( mStatistics & QgsZonalStatistics::StDev )
{
double sumSquared = 0;
for ( int i = 0; i < featureStats.values.count(); ++i )
{
double diff = featureStats.values.at( i ) - mean;
sumSquared += diff * diff;
}
double stdev = qPow( sumSquared / featureStats.values.count(), 0.5 );
changeAttributeMap.insert( stdevIndex, QVariant( stdev ) );
}
if ( mStatistics & QgsZonalStatistics::Min )
changeAttributeMap.insert( minIndex, QVariant( featureStats.min ) );
if ( mStatistics & QgsZonalStatistics::Max )
changeAttributeMap.insert( maxIndex, QVariant( featureStats.max ) );
if ( mStatistics & QgsZonalStatistics::Range )
changeAttributeMap.insert( rangeIndex, QVariant( featureStats.max - featureStats.min ) );
if ( mStatistics & QgsZonalStatistics::Minority || mStatistics & QgsZonalStatistics::Majority )
{
QList<int> vals = featureStats.valueCount.values();
qSort( vals.begin(), vals.end() );
if ( mStatistics & QgsZonalStatistics::Minority )
{
float minorityKey = featureStats.valueCount.key( vals.first() );
changeAttributeMap.insert( minorityIndex, QVariant( minorityKey ) );
}
if ( mStatistics & QgsZonalStatistics::Majority )
{
float majKey = featureStats.valueCount.key( vals.last() );
changeAttributeMap.insert( majorityIndex, QVariant( majKey ) );
}
}
if ( mStatistics & QgsZonalStatistics::Variety )
changeAttributeMap.insert( varietyIndex, QVariant( featureStats.valueCount.count() ) );
}
changeMap.insert( f.id(), changeAttributeMap );
++featureCounter;
}
vectorProvider->changeAttributeValues( changeMap );
if ( p )
{
p->setValue( featureCount );
}
GDALClose( inputDataset );
mPolygonLayer->updateFields();
if ( p && p->wasCanceled() )
{
return 9;
}
return 0;
}
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;
}
QgsFieldMap fields;
fields.insert( 0 , QgsField( QString( "UID" ), QVariant::String ) );
fields.insert( 1 , QgsField( QString( "AREA" ), QVariant::Double ) );
fields.insert( 2 , QgsField( QString( "PERIM" ), QVariant::Double ) );
QGis::WkbType outputType = QGis::WKBPolygon;
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), fields, outputType, &crs );
QgsFeature currentFeature;
QgsGeometry* dissolveGeometry = 0; //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->featureAtId( *it, currentFeature, true, true ) )
{
continue;
}
map.insert( currentFeature.attributeMap()[ uniqueIdField ].toString(), currentFeature.id() );
}
}
else
{
layer->select( layer->pendingAllAttributesList(), QgsRectangle(), true, false );
while ( layer->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.attributeMap()[ 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->featureAtId( jt.value(), currentFeature, true, true ) )
{
continue;
}
convexFeature( currentFeature, processedFeatures, &dissolveGeometry );
++processedFeatures;
}
++jt;
}
QList<double> values;
if ( !dissolveGeometry )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveGeometry = dissolveGeometry->convexHull();
values = simpleMeasure( dissolveGeometry );
QgsAttributeMap attributeMap;
attributeMap.insert( 0 , QVariant( currentKey ) );
attributeMap.insert( 1 , values[ 0 ] );
attributeMap.insert( 2 , values[ 1 ] );
QgsFeature dissolveFeature;
dissolveFeature.setAttributeMap( attributeMap );
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->featureAtId( jt.value(), currentFeature, true, true ) )
{
continue;
}
convexFeature( currentFeature, processedFeatures, &dissolveGeometry );
++processedFeatures;
++jt;
}
QList<double> values;
// QgsGeometry* tmpGeometry = 0;
if ( !dissolveGeometry )
{
QgsDebugMsg( "no dissolved geometry - should not happen" );
return false;
}
dissolveGeometry = dissolveGeometry->convexHull();
// values = simpleMeasure( tmpGeometry );
values = simpleMeasure( dissolveGeometry );
QgsAttributeMap attributeMap;
attributeMap.insert( 0 , QVariant( currentKey ) );
attributeMap.insert( 1 , QVariant( values[ 0 ] ) );
attributeMap.insert( 2 , QVariant( values[ 1 ] ) );
QgsFeature dissolveFeature;
dissolveFeature.setAttributeMap( attributeMap );
dissolveFeature.setGeometry( dissolveGeometry );
vWriter.addFeature( dissolveFeature );
}
}
return true;
}
bool QgsGeometryAnalyzer::extent( QgsVectorLayer* layer,
const QString& shapefileName,
bool onlySelectedFeatures,
QProgressDialog * )
{
if ( !layer )
{
return false;
}
QgsVectorDataProvider* dp = layer->dataProvider();
if ( !dp )
{
return false;
}
QGis::WkbType outputType = QGis::WKBPolygon;
const QgsCoordinateReferenceSystem crs = layer->crs();
QgsFieldMap fields;
fields.insert( 0 , QgsField( QString( "MINX" ), QVariant::Double ) );
fields.insert( 1 , QgsField( QString( "MINY" ), QVariant::Double ) );
fields.insert( 2 , QgsField( QString( "MAXX" ), QVariant::Double ) );
fields.insert( 3 , QgsField( QString( "MAXY" ), QVariant::Double ) );
fields.insert( 4 , QgsField( QString( "CNTX" ), QVariant::Double ) );
fields.insert( 5 , QgsField( QString( "CNTY" ), QVariant::Double ) );
fields.insert( 6 , QgsField( QString( "AREA" ), QVariant::Double ) );
fields.insert( 7 , QgsField( QString( "PERIM" ), QVariant::Double ) );
fields.insert( 8 , QgsField( QString( "HEIGHT" ), QVariant::Double ) );
fields.insert( 9 , QgsField( QString( "WIDTH" ), QVariant::Double ) );
QgsVectorFileWriter vWriter( shapefileName, dp->encoding(), fields, outputType, &crs );
QgsRectangle rect;
if ( onlySelectedFeatures ) // take only selection
{
rect = layer->boundingBoxOfSelected();
}
else
{
rect = layer->extent();
}
double minx = rect.xMinimum();
double miny = rect.yMinimum();
double maxx = rect.xMaximum();
double maxy = rect.yMaximum();
double height = rect.height();
double width = rect.width();
double cntx = minx + ( width / 2.0 );
double cnty = miny + ( height / 2.0 );
double area = width * height;
double perim = ( 2 * width ) + ( 2 * height );
QgsFeature feat;
QgsAttributeMap map;
map.insert( 0 , QVariant( minx ) );
map.insert( 1 , QVariant( miny ) );
map.insert( 2 , QVariant( maxx ) );
map.insert( 3 , QVariant( maxy ) );
map.insert( 4 , QVariant( cntx ) );
map.insert( 5 , QVariant( cnty ) );
map.insert( 6 , QVariant( area ) );
map.insert( 7 , QVariant( perim ) );
map.insert( 8 , QVariant( height ) );
map.insert( 9 , QVariant( width ) );
feat.setAttributeMap( map );
feat.setGeometry( QgsGeometry::fromRect( rect ) );
vWriter.addFeature( feat );
return true;
}