C++ iterator::geometry方法代码示例

QgsGeometry* QgsMapToolOffsetCurve::createOriginGeometry( QgsVectorLayer* vl, const QgsPointLocator::Match& match, QgsFeature& snappedFeature )
{
  if ( !vl )
  {
    return 0;
  }

  mMultiPartGeometry = false;
  //assign feature part by vertex number (snap to vertex) or by before vertex number (snap to segment)
  int partVertexNr = match.vertexIndex();

  if ( vl == currentVectorLayer() && !mForceCopy )
  {
    //don't consider selected geometries, only the snap result
    return convertToSingleLine( snappedFeature.geometryAndOwnership(), partVertexNr, mMultiPartGeometry );
  }
  else //snapped to a background layer
  {
    //if source layer is polygon / multipolygon, create a linestring from the snapped ring
    if ( vl->geometryType() == QGis::Polygon )
    {
      //make linestring from polygon ring and return this geometry
      return linestringFromPolygon( snappedFeature.geometry(), partVertexNr );
    }

    //for background layers, try to merge selected entries together if snapped feature is contained in selection
    const QgsFeatureIds& selection = vl->selectedFeaturesIds();
    if ( selection.size() < 1 || !selection.contains( match.featureId() ) )
    {
      return convertToSingleLine( snappedFeature.geometryAndOwnership(), partVertexNr, mMultiPartGeometry );
    }
    else
    {
      //merge together if several features
      QgsFeatureList selectedFeatures = vl->selectedFeatures();
      QgsFeatureList::iterator selIt = selectedFeatures.begin();
      QgsGeometry* geom = selIt->geometryAndOwnership();
      ++selIt;
      for ( ; selIt != selectedFeatures.end(); ++selIt )
      {
        QgsGeometry* combined = geom->combine( selIt->geometry() );
        delete geom;
        geom = combined;
      }

      //if multitype, return only the snapped to geometry
      if ( geom->isMultipart() )
      {
        delete geom;
        return convertToSingleLine( snappedFeature.geometryAndOwnership(), match.vertexIndex(), mMultiPartGeometry );
      }

      return geom;
    }
  }
}

QgsFeatureList QgsClipboard::transformedCopyOf( QgsCoordinateReferenceSystem destCRS )
{
  QgsFeatureList featureList = copyOf();
  QgsCoordinateTransform ct( crs(), destCRS );

  QgsDebugMsg( "transforming clipboard." );
  for ( QgsFeatureList::iterator iter = featureList.begin(); iter != featureList.end(); ++iter )
  {
    iter->geometry()->transform( ct );
  }

  return featureList;
}

void QgsClipboard::replaceWithCopyOf( const QgsFieldMap& fields, QgsFeatureList& features )
{

  // Replace the QGis clipboard.
  mFeatureClipboard = features;
  QgsDebugMsg( "replaced QGis clipboard." );

  // Replace the system clipboard.

  QStringList textLines;
  QStringList textFields;

  // first do the field names
  textFields += "wkt_geom";
  for ( QgsFieldMap::const_iterator fit = fields.begin(); fit != fields.end(); ++fit )
  {
    textFields += fit->name();
  }
  textLines += textFields.join( "\t" );
  textFields.clear();


  // then the field contents
  for ( QgsFeatureList::iterator it = features.begin(); it != features.end(); ++it )
  {
    QgsAttributeMap attributes = it->attributeMap();


    // TODO: Set up Paste Transformations to specify the order in which fields are added.

    if ( it->geometry() )
      textFields += it->geometry()->exportToWkt();
    else
    {
      QSettings settings;
      textFields += settings.value( "qgis/nullValue", "NULL" ).toString();
    }

    // QgsDebugMsg("about to traverse fields.");
    //
    for ( QgsAttributeMap::iterator it2 = attributes.begin(); it2 != attributes.end(); ++it2 )
    {
      // QgsDebugMsg(QString("inspecting field '%1'.").arg(it2->toString()));
      textFields += it2->toString();
    }

    textLines += textFields.join( "\t" );
    textFields.clear();
  }

  QString textCopy = textLines.join( "\n" );

  QClipboard *cb = QApplication::clipboard();

  // Copy text into the clipboard

  // With qgis running under Linux, but with a Windows based X
  // server (Xwin32), ::Selection was necessary to get the data into
  // the Windows clipboard (which seems contrary to the Qt
  // docs). With a Linux X server, ::Clipboard was required.
  // The simple solution was to put the text into both clipboards.

  // The ::Selection setText() below one may need placing inside so
  // #ifdef so that it doesn't get compiled under Windows.
  cb->setText( textCopy, QClipboard::Selection );
  cb->setText( textCopy, QClipboard::Clipboard );

  QgsDebugMsg( QString( "replaced system clipboard with: %1." ).arg( textCopy ) );
}

bool QgsDb2Provider::addFeatures( QgsFeatureList & flist )
{
  QgsDebugMsg( "mGeometryColType: " + mGeometryColType );
  int writeCount = 0;
  bool copyOperation = false;

  if ( !mDatabase.isOpen() )
  {
    QString errMsg;
    mDatabase = getDatabase( mConnInfo, errMsg );
    if ( !errMsg.isEmpty() )
    {
      QgsDebugMsg( "getDatabase failed: " + errMsg );
      return false;
    }
  }
  if ( !mDatabase.transaction() )
  {
    QgsDebugMsg( "transaction failed" );
    return false;
  }
  QSqlQuery query = QSqlQuery( mDatabase );
  query.setForwardOnly( true );
  QSqlQuery queryFid = QSqlQuery( mDatabase );
  queryFid.setForwardOnly( true );

  QgsFeature it = flist.at( 0 );
  QString statement;
  QString values;
  statement = QString( "INSERT INTO %1.%2 (" ).arg( mSchemaName, mTableName );

  bool first = true;

// Get the first geometry and its wkbType as when we are doing drag/drop,
// the wkbType is not passed to the DB2 provider from QgsVectorLayerImport
// Can't figure out how to resolved "unreferenced" wkbType compile message
// Don't really do anything with it at this point
#if 0
  QgsGeometry *geom = it.geometry();
  QgsWkbTypes::Type wkbType = geom->wkbType();
  QgsDebugMsg( QString( "wkbType: %1" ).arg( wkbType ) );
  QgsDebugMsg( QString( "mWkbType: %1" ).arg( mWkbType ) );
#endif

  QgsAttributes attrs = it.attributes();
  QgsDebugMsg( QString( "attrs.count: %1" ).arg( attrs.count() ) );
  QgsDebugMsg( QString( "fields.count: %1" ).arg( mAttributeFields.count() ) );
  if ( mAttributeFields.count() == ( attrs.count() + 1 ) )
  {
    copyOperation = true; // FID is first field but no attribute in attrs
  }
  else if ( mAttributeFields.count() !=  attrs.count() )
  {
    QgsDebugMsg( "Count mismatch - failing" );
    return false;
  }


  if ( attrs.count() != mAttributeFields.count() )
  {
    QgsDebugMsg( "field counts don't match" );
//  return false;
  }

  for ( int i = 0; i < mAttributeFields.count(); ++i )
  {
    QgsField fld = mAttributeFields.at( i );
    QgsDebugMsg( QString( "i: %1; got field: %2" ).arg( i ).arg( fld.name() ) );

    if ( fld.name().isEmpty() )
      continue; // invalid

    if ( mFidColName == fld.name() )
      continue; // skip identity field

//      if ( mDefaultValues.contains( i ) && mDefaultValues[i] == attrs.at( i ) )
//        continue; // skip fields having default values

    if ( !first )
    {
      statement += ',';
      values += ',';
    }
    else
      first = false;

    statement += QString( "%1" ).arg( fld.name() );
    values += QString( "?" );
  }

  // append geometry column name
  if ( !mGeometryColName.isEmpty() )
  {
    if ( !first )
    {
      statement += ',';
      values += ',';
    }

    statement += QString( "%1" ).arg( mGeometryColName );
//.........这里部分代码省略.........