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C++ QgsFeature函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中QgsFeature函数的典型用法代码示例。如果您正苦于以下问题：C++ QgsFeature函数的具体用法？C++ QgsFeature怎么用？C++ QgsFeature使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了QgsFeature函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: highlightFeature

void QgsRelationReferenceWidget::highlightActionTriggered( QAction *action )
{
  if ( action == mHighlightFeatureAction )
  {
    highlightFeature();
  }
  else if ( action == mScaleHighlightFeatureAction )
  {
    highlightFeature( QgsFeature(), Scale );
  }
  else if ( action == mPanHighlightFeatureAction )
  {
    highlightFeature( QgsFeature(), Pan );
  }
}
开发者ID:alexbruy，项目名称:QGIS，代码行数:15，代码来源:qgsrelationreferencewidget.cpp


示例2: connect

void QgsDualView::init( QgsVectorLayer* layer, QgsMapCanvas* mapCanvas, const QgsFeatureRequest &request, const QgsAttributeEditorContext &context )
{
  mEditorContext = context;

  connect( mTableView, SIGNAL( willShowContextMenu( QMenu*, QModelIndex ) ), this, SLOT( viewWillShowContextMenu( QMenu*, QModelIndex ) ) );

  initLayerCache( layer, !request.filterRect().isNull() );
  initModels( mapCanvas, request );

  mConditionalFormatWidget->setLayer( layer );

  mTableView->setModel( mFilterModel );
  mFeatureList->setModel( mFeatureListModel );
  mAttributeForm = new QgsAttributeForm( layer, QgsFeature(), mEditorContext );
  if ( !mAttributeEditorScrollArea->layout() )
    mAttributeEditorScrollArea->setLayout( new QGridLayout() );
  mAttributeEditorScrollArea->layout()->addWidget( mAttributeForm );
  mAttributeEditorScrollArea->setWidget( mAttributeForm );

  mAttributeForm->hideButtonBox();

  connect( mAttributeForm, SIGNAL( attributeChanged( QString, QVariant ) ), this, SLOT( featureFormAttributeChanged() ) );
  connect( mMasterModel, SIGNAL( modelChanged() ), mAttributeForm, SLOT( refreshFeature() ) );

  if ( mFeatureListPreviewButton->defaultAction() )
    mFeatureList->setDisplayExpression( mDisplayExpression );
  else
    columnBoxInit();

  // This slows down load of the attribute table heaps and uses loads of memory.
  //mTableView->resizeColumnsToContents();

  mFeatureList->setEditSelection( QgsFeatureIds() << mFeatureListModel->idxToFid( mFeatureListModel->index( 0, 0 ) ) );
}
开发者ID:RenShuYuan，项目名称:UAVplatform，代码行数:34，代码来源:qgsdualview.cpp


示例3: QSettings

void QgsRelationReferenceWidget::deleteForeignKey()
{
  QVariant nullValue = QSettings().value( "qgis/nullValue", "NULL" );
  if ( mReadOnlySelector )
  {
    QString nullText = "";
    if ( mAllowNull )
    {
      nullText = tr( "%1 (no selection)" ).arg( nullValue.toString() );
    }
    mLineEdit->setText( nullText );
    mForeignKey = QVariant();
    mFeature.setValid( false );
  }
  else
  {
    if ( mAllowNull )
    {
      mComboBox->setCurrentIndex( 0 );
    }
    else
    {
      mComboBox->setCurrentIndex( -1 );
    }
  }
  mRemoveFKButton->setEnabled( false );
  updateAttributeEditorFrame( QgsFeature() );
  emit foreignKeyChanged( QVariant( QVariant::Int ) );
}
开发者ID:spatialthoughts，项目名称:QGIS，代码行数:29，代码来源:qgsrelationreferencewidget.cpp


示例4: while

bool QgsCachedFeatureIterator::fetchFeature( QgsFeature &f )
{
  f.setValid( false );

  if ( mClosed )
    return false;

  while ( mFeatureIdIterator != mFeatureIds.constEnd() )
  {
    if ( !mVectorLayerCache->mCache.contains( *mFeatureIdIterator ) )
    {
      ++mFeatureIdIterator;
      continue;
    }

    f = QgsFeature( *mVectorLayerCache->mCache[*mFeatureIdIterator]->feature() );
    ++mFeatureIdIterator;
    if ( mRequest.acceptFeature( f ) )
    {
      f.setValid( true );
      geometryToDestinationCrs( f, mTransform );
      return true;
    }
  }
  close();
  return false;
}
开发者ID:cz172638，项目名称:QGIS，代码行数:27，代码来源:qgscachedfeatureiterator.cpp


示例5: disableChainedComboBoxes

void QgsRelationReferenceWidget::deleteForeignKey()
{
  // deactivate filter comboboxes
  if ( mChainFilters && !mFilterComboBoxes.isEmpty() )
  {
    QComboBox *cb = mFilterComboBoxes.first();
    cb->setCurrentIndex( 0 );
    disableChainedComboBoxes( cb );
  }

  if ( mReadOnlySelector )
  {
    const QString nullValue = QgsApplication::nullRepresentation();

    QString nullText;
    if ( mAllowNull )
    {
      nullText = tr( "%1 (no selection)" ).arg( nullValue );
    }
    mLineEdit->setText( nullText );
    mForeignKey = QVariant( QVariant::Int );
    mFeature.setValid( false );
  }
  else
  {
    mComboBox->setIdentifierValue( QVariant( QVariant::Int ) );
  }
  mRemoveFKButton->setEnabled( false );
  updateAttributeEditorFrame( QgsFeature() );
  emitForeignKeyChanged( QVariant( QVariant::Int ) );
}
开发者ID:alexbruy，项目名称:QGIS，代码行数:31，代码来源:qgsrelationreferencewidget.cpp


示例6: QDialog

QgsSelectByFormDialog::QgsSelectByFormDialog( QgsVectorLayer *layer, const QgsAttributeEditorContext &context, QWidget *parent, Qt::WindowFlags fl )
  : QDialog( parent, fl )
  , mLayer( layer )
  , mMessageBar( nullptr )
{
  QgsAttributeEditorContext dlgContext = context;
  dlgContext.setFormMode( QgsAttributeEditorContext::StandaloneDialog );
  dlgContext.setAllowCustomUi( false );

  mForm = new QgsAttributeForm( layer, QgsFeature(), dlgContext, this );
  mForm->setMode( QgsAttributeForm::SearchMode );

  QVBoxLayout *vLayout = new QVBoxLayout();
  vLayout->setMargin( 0 );
  vLayout->setContentsMargins( 0, 0, 0, 0 );
  setLayout( vLayout );

  vLayout->addWidget( mForm );

  connect( mForm, &QgsAttributeForm::closed, this, &QWidget::close );

  QgsSettings settings;
  restoreGeometry( settings.value( QStringLiteral( "Windows/SelectByForm/geometry" ) ).toByteArray() );

  setWindowTitle( tr( "Select features by value" ) );
}
开发者ID:cayetanobv，项目名称:QGIS，代码行数:26，代码来源:qgsselectbyformdialog.cpp


示例7: mComposition

QgsAtlasComposition::QgsAtlasComposition( QgsComposition* composition )
    : mComposition( composition )
    , mEnabled( false )
    , mHideCoverage( false )
    , mFilenamePattern( "'output_'||$feature" )
    , mCoverageLayer( 0 )
    , mSingleFile( false )
    , mSortFeatures( false )
    , mSortAscending( true )
    , mCurrentFeatureNo( 0 )
    , mFilterFeatures( false )
{

  // declare special columns with a default value
  QgsExpression::setSpecialColumn( "$page", QVariant(( int )1 ) );
  QgsExpression::setSpecialColumn( "$feature", QVariant(( int )0 ) );
  QgsExpression::setSpecialColumn( "$numpages", QVariant(( int )1 ) );
  QgsExpression::setSpecialColumn( "$numfeatures", QVariant(( int )0 ) );
  QgsExpression::setSpecialColumn( "$atlasfeatureid", QVariant(( int )0 ) );
  QgsExpression::setSpecialColumn( "$atlasfeature", QVariant::fromValue( QgsFeature() ) );
  QgsExpression::setSpecialColumn( "$atlasgeometry", QVariant::fromValue( QgsGeometry() ) );

  //listen out for layer removal
  connect( QgsMapLayerRegistry::instance(), SIGNAL( layersWillBeRemoved( QStringList ) ), this, SLOT( removeLayers( QStringList ) ) );
}
开发者ID:TengTeckHou，项目名称:QGIS，代码行数:25，代码来源:qgsatlascomposition.cpp


示例8: connect

void QgsDualView::init( QgsVectorLayer* layer, QgsMapCanvas* mapCanvas, const QgsFeatureRequest &request, QgsAttributeEditorContext context )
{
  mEditorContext = context;

  connect( mTableView, SIGNAL( willShowContextMenu( QMenu*, QModelIndex ) ), this, SLOT( viewWillShowContextMenu( QMenu*, QModelIndex ) ) );

  initLayerCache( layer );
  initModels( mapCanvas, request );

  mTableView->setModel( mFilterModel );
  mFeatureList->setModel( mFeatureListModel );
  mAttributeForm = new QgsAttributeForm( layer, QgsFeature(), mEditorContext );
  mAttributeEditorScrollArea->setLayout( new QGridLayout() );
  mAttributeEditorScrollArea->layout()->addWidget( mAttributeForm );
  mAttributeEditorScrollArea->setWidget( mAttributeForm );

  mAttributeForm->hideButtonBox();

  connect( mAttributeForm, SIGNAL( attributeChanged( QString, QVariant ) ), this, SLOT( featureFormAttributeChanged() ) );

  if ( mFeatureListPreviewButton->defaultAction() )
    mFeatureList->setDisplayExpression( mDisplayExpression );
  else
    columnBoxInit();

  mFeatureList->setEditSelection( QgsFeatureIds() << mFeatureListModel->idxToFid( mFeatureListModel->index( 0, 0 ) ) );
}
开发者ID:ShekharReddyN，项目名称:QGIS，代码行数:27，代码来源:qgsdualview.cpp


示例9: context

void QgsRelationReferenceWidget::setRelation( const QgsRelation& relation, bool allowNullValue )
{
  mAllowNull = allowNullValue;
  mRemoveFKButton->setVisible( allowNullValue && mReadOnlySelector );

  if ( relation.isValid() )
  {
    mInvalidLabel->hide();

    mRelation = relation;
    mReferencingLayer = relation.referencingLayer();
    mRelationName = relation.name();
    mReferencedLayer = relation.referencedLayer();
    mFkeyFieldIdx = mReferencedLayer->fieldNameIndex( relation.fieldPairs().first().second );

    QgsAttributeEditorContext context( mEditorContext, relation, QgsAttributeEditorContext::Single, QgsAttributeEditorContext::Embed );

    if ( mEmbedForm )
    {
      mAttributeEditorFrame->setTitle( mReferencedLayer->name() );
      mReferencedAttributeForm = new QgsAttributeForm( relation.referencedLayer(), QgsFeature(), context, this );
      mReferencedAttributeForm->hideButtonBox();
      mAttributeEditorLayout->addWidget( mReferencedAttributeForm );
    }
  }
  else
  {
    mInvalidLabel->show();
  }

  if ( mShown && isVisible() )
  {
    init();
  }
}
开发者ID:spatialthoughts，项目名称:QGIS，代码行数:35，代码来源:qgsrelationreferencewidget.cpp


示例10: QString

bool QgsPostgresFeatureIterator::fetchFeature( QgsFeature& feature )
{
  feature.setValid( false );

  if ( mClosed )
    return false;

  if ( mFeatureQueue.empty() )
  {
    QString fetch = QString( "FETCH FORWARD %1 FROM %2" ).arg( mFeatureQueueSize ).arg( mCursorName );
    QgsDebugMsgLevel( QString( "fetching %1 features." ).arg( mFeatureQueueSize ), 4 );
    if ( mConn->PQsendQuery( fetch ) == 0 ) // fetch features asynchronously
    {
      QgsMessageLog::logMessage( QObject::tr( "Fetching from cursor %1 failed\nDatabase error: %2" ).arg( mCursorName, mConn->PQerrorMessage() ), QObject::tr( "PostGIS" ) );
    }

    QgsPostgresResult queryResult;
    for ( ;; )
    {
      queryResult = mConn->PQgetResult();
      if ( !queryResult.result() )
        break;

      if ( queryResult.PQresultStatus() != PGRES_TUPLES_OK )
      {
        QgsMessageLog::logMessage( QObject::tr( "Fetching from cursor %1 failed\nDatabase error: %2" ).arg( mCursorName, mConn->PQerrorMessage() ), QObject::tr( "PostGIS" ) );
        break;
      }

      int rows = queryResult.PQntuples();
      if ( rows == 0 )
        continue;

      for ( int row = 0; row < rows; row++ )
      {
        mFeatureQueue.enqueue( QgsFeature() );
        getFeature( queryResult, row, mFeatureQueue.back() );
      } // for each row in queue
    }
  }

  if ( mFeatureQueue.empty() )
  {
    QgsDebugMsg( QString( "Finished after %1 features" ).arg( mFetched ) );
    close();

    mSource->mShared->ensureFeaturesCountedAtLeast( mFetched );

    return false;
  }

  feature = mFeatureQueue.dequeue();
  mFetched++;

  feature.setValid( true );
  feature.setFields( mSource->mFields ); // allow name-based attribute lookups

  return true;
}
开发者ID:woodchuck，项目名称:QGIS，代码行数:59，代码来源:qgspostgresfeatureiterator.cpp


示例11: connect

void QgsDualView::init( QgsVectorLayer *layer, QgsMapCanvas *mapCanvas, const QgsFeatureRequest &request, const QgsAttributeEditorContext &context, bool loadFeatures )
{
  if ( !layer )
    return;

  mLayer = layer;

  mEditorContext = context;

  connect( mTableView, &QgsAttributeTableView::willShowContextMenu, this, &QgsDualView::viewWillShowContextMenu );
  mTableView->horizontalHeader()->setContextMenuPolicy( Qt::CustomContextMenu );
  connect( mTableView->horizontalHeader(), &QHeaderView::customContextMenuRequested, this, &QgsDualView::showViewHeaderMenu );
  connect( mTableView, &QgsAttributeTableView::columnResized, this, &QgsDualView::tableColumnResized );
  connect( mFeatureList, &QgsFeatureListView::willShowContextMenu, this, &QgsDualView::widgetWillShowContextMenu );

  initLayerCache( !( request.flags() & QgsFeatureRequest::NoGeometry ) || !request.filterRect().isNull() );
  initModels( mapCanvas, request, loadFeatures );

  mConditionalFormatWidget->setLayer( mLayer );

  mTableView->setModel( mFilterModel );
  mFeatureList->setModel( mFeatureListModel );
  delete mAttributeForm;
  mAttributeForm = new QgsAttributeForm( mLayer, mTempAttributeFormFeature, mEditorContext );
  mTempAttributeFormFeature = QgsFeature();
  if ( !context.parentContext() )
  {
    mAttributeEditorScrollArea = new QgsScrollArea();
    mAttributeEditorScrollArea->setWidgetResizable( true );
    mAttributeEditor->layout()->addWidget( mAttributeEditorScrollArea );
    mAttributeEditorScrollArea->setWidget( mAttributeForm );
  }
  else
  {
    mAttributeEditor->layout()->addWidget( mAttributeForm );
  }

  connect( mAttributeForm, &QgsAttributeForm::widgetValueChanged, this, &QgsDualView::featureFormAttributeChanged );
  connect( mAttributeForm, &QgsAttributeForm::modeChanged, this, &QgsDualView::formModeChanged );
  connect( mMasterModel, &QgsAttributeTableModel::modelChanged, mAttributeForm, &QgsAttributeForm::refreshFeature );
  connect( mAttributeForm, &QgsAttributeForm::filterExpressionSet, this, &QgsDualView::filterExpressionSet );
  connect( mFilterModel, &QgsAttributeTableFilterModel::sortColumnChanged, this, &QgsDualView::onSortColumnChanged );

  if ( mFeatureListPreviewButton->defaultAction() )
    mFeatureList->setDisplayExpression( mDisplayExpression );
  else
    columnBoxInit();

  // This slows down load of the attribute table heaps and uses loads of memory.
  //mTableView->resizeColumnsToContents();

  mFeatureList->setEditSelection( QgsFeatureIds() << mFeatureListModel->idxToFid( mFeatureListModel->index( 0, 0 ) ) );
}
开发者ID:AlisterH，项目名称:Quantum-GIS，代码行数:53，代码来源:qgsdualview.cpp


示例12: while

bool QgsCachedFeatureIterator::fetchFeature( QgsFeature& f )
{
  mFeatureIdIterator++;

  while ( mFeatureIdIterator != mFeatureIds.end() )
  {
    f = QgsFeature( *mVectorLayerCache->mCache[*mFeatureIdIterator]->feature() );
    if ( mRequest.acceptFeature( f ) )
      return true;
  }
  return false;
}
开发者ID:Integrante，项目名称:QGIS，代码行数:12，代码来源:qgscachedfeatureiterator.cpp


示例13: referencedColumns

QStringList QgsDataDefined::referencedColumns( QgsVectorLayer* layer )
{
  if ( layer )
  {
    return referencedColumns( QgsExpressionContextUtils::createFeatureBasedContext( QgsFeature(), layer->fields() ) );
  }
  else
  {
    QgsExpressionContext empty;
    return referencedColumns( empty );
  }
}
开发者ID:Benardi-atmadja，项目名称:QGIS，代码行数:12，代码来源:qgsdatadefined.cpp


示例14: whileBlocking

void QgsRelationReferenceWidget::showIndeterminateState()
{
  if ( mReadOnlySelector )
  {
    whileBlocking( mLineEdit )->setText( QString() );
  }
  else
  {
    whileBlocking( mComboBox )->setCurrentIndex( -1 );
  }
  mRemoveFKButton->setEnabled( false );
  updateAttributeEditorFrame( QgsFeature() );
}
开发者ID:3liz，项目名称:Quantum-GIS，代码行数:13，代码来源:qgsrelationreferencewidget.cpp


示例15: prepareExpression

bool QgsDataDefined::prepareExpression( QgsVectorLayer* layer )
{
  if ( layer )
  {
    return prepareExpression( QgsExpressionContextUtils::createFeatureBasedContext( QgsFeature(), layer->fields() ) );
  }
  else
  {
    //preparing expression without a layer set, so pass empty context
    QgsExpressionContext empty;
    return prepareExpression( empty );
  }
}
开发者ID:Benardi-atmadja，项目名称:QGIS，代码行数:13，代码来源:qgsdatadefined.cpp


示例16: QgsFeature

bool QgsCachedFeatureIterator::fetchFeature( QgsFeature& f )
{
  mFeatureIdIterator++;

  if ( mFeatureIdIterator == mFeatureIds.end() )
  {
    return false;
  }
  else
  {
    f = QgsFeature( *mVectorLayerCache->mCache[*mFeatureIdIterator]->feature() );
    return true;
  }
}
开发者ID:ChowZenki，项目名称:QGIS，代码行数:14，代码来源:qgscachedfeatureiterator.cpp


示例17: connect

void QgsDualView::init( QgsVectorLayer* layer, QgsMapCanvas* mapCanvas, const QgsFeatureRequest &request, const QgsAttributeEditorContext &context )
{
  if ( !layer )
    return;

  mEditorContext = context;

  connect( mTableView, SIGNAL( willShowContextMenu( QMenu*, QModelIndex ) ), this, SLOT( viewWillShowContextMenu( QMenu*, QModelIndex ) ) );
  mTableView->horizontalHeader()->setContextMenuPolicy( Qt::CustomContextMenu );
  connect( mTableView->horizontalHeader(), SIGNAL( customContextMenuRequested( QPoint ) ), this, SLOT( showViewHeaderMenu( QPoint ) ) );
  connect( mTableView, SIGNAL( columnResized( int, int ) ), this, SLOT( tableColumnResized( int, int ) ) );

  initLayerCache( layer, !request.filterRect().isNull() );
  initModels( mapCanvas, request );

  mConditionalFormatWidget->setLayer( layer );

  mTableView->setModel( mFilterModel );
  mFeatureList->setModel( mFeatureListModel );
  delete mAttributeForm;
  mAttributeForm = new QgsAttributeForm( layer, QgsFeature(), mEditorContext );
  if ( !context.parentContext() )
  {
    mAttributeEditorScrollArea = new QScrollArea();
    mAttributeEditorScrollArea->setWidgetResizable( true );
    mAttributeEditor->layout()->addWidget( mAttributeEditorScrollArea );
    mAttributeEditorScrollArea->setWidget( mAttributeForm );
  }
  else
  {
    mAttributeEditor->layout()->addWidget( mAttributeForm );
  }

  connect( mAttributeForm, SIGNAL( attributeChanged( QString, QVariant ) ), this, SLOT( featureFormAttributeChanged() ) );
  connect( mAttributeForm, SIGNAL( modeChanged( QgsAttributeForm::Mode ) ), this, SIGNAL( formModeChanged( QgsAttributeForm::Mode ) ) );
  connect( mMasterModel, SIGNAL( modelChanged() ), mAttributeForm, SLOT( refreshFeature() ) );
  connect( mAttributeForm, SIGNAL( filterExpressionSet( QString, QgsAttributeForm::FilterType ) ), this, SIGNAL( filterExpressionSet( QString, QgsAttributeForm::FilterType ) ) );
  connect( mFilterModel, SIGNAL( sortColumnChanged( int, Qt::SortOrder ) ), this, SLOT( onSortColumnChanged() ) );
  if ( mFeatureListPreviewButton->defaultAction() )
    mFeatureList->setDisplayExpression( mDisplayExpression );
  else
    columnBoxInit();

  // This slows down load of the attribute table heaps and uses loads of memory.
  //mTableView->resizeColumnsToContents();

  mFeatureList->setEditSelection( QgsFeatureIds() << mFeatureListModel->idxToFid( mFeatureListModel->index( 0, 0 ) ) );
}
开发者ID:wongjimsan，项目名称:QGIS，代码行数:48，代码来源:qgsdualview.cpp


示例18: QStringLiteral

void QgsRelationReferenceWidget::setRelation( const QgsRelation &relation, bool allowNullValue )
{
  mAllowNull = allowNullValue;
  mRemoveFKButton->setVisible( allowNullValue && mReadOnlySelector );

  if ( relation.isValid() )
  {
    mInvalidLabel->hide();

    mRelation = relation;
    mReferencingLayer = relation.referencingLayer();
    mRelationName = relation.name();
    mReferencedLayer = relation.referencedLayer();
    mReferencedField = relation.fieldPairs().at( 0 ).second;
    if ( mComboBox )
      mComboBox->setIdentifierField( mReferencedField );

    mReferencedFieldIdx = mReferencedLayer->fields().lookupField( relation.fieldPairs().at( 0 ).second );
    mReferencingFieldIdx = mReferencingLayer->fields().lookupField( relation.fieldPairs().at( 0 ).first );
    mAttributeEditorFrame->setObjectName( QStringLiteral( "referencing/" ) + relation.name() );


    if ( mEmbedForm )
    {
      QgsAttributeEditorContext context( mEditorContext, relation, QgsAttributeEditorContext::Single, QgsAttributeEditorContext::Embed );
      mAttributeEditorFrame->setTitle( mReferencedLayer->name() );
      mReferencedAttributeForm = new QgsAttributeForm( relation.referencedLayer(), QgsFeature(), context, this );
      mAttributeEditorLayout->addWidget( mReferencedAttributeForm );
    }

    connect( mReferencedLayer, &QgsVectorLayer::editingStarted, this, &QgsRelationReferenceWidget::updateAddEntryButton );
    connect( mReferencedLayer, &QgsVectorLayer::editingStopped, this, &QgsRelationReferenceWidget::updateAddEntryButton );
    updateAddEntryButton();
  }
  else
  {
    mInvalidLabel->show();
  }

  if ( mShown && isVisible() )
  {
    init();
  }
}
开发者ID:alexbruy，项目名称:QGIS，代码行数:44，代码来源:qgsrelationreferencewidget.cpp


示例19: mComposition

QgsAtlasComposition::QgsAtlasComposition( QgsComposition* composition ) :
    mComposition( composition ),
    mEnabled( false ),
    mHideCoverage( false ), mFilenamePattern( "'output_'||$feature" ),
    mCoverageLayer( 0 ), mSingleFile( false ),
    mSortFeatures( false ), mSortAscending( true ), mCurrentFeatureNo( 0 ),
    mFilterFeatures( false ), mFeatureFilter( "" ),
    mFilenameParserError( QString() ),
    mFilterParserError( QString() )
{

  // declare special columns with a default value
  QgsExpression::setSpecialColumn( "$page", QVariant(( int )1 ) );
  QgsExpression::setSpecialColumn( "$feature", QVariant(( int )0 ) );
  QgsExpression::setSpecialColumn( "$numpages", QVariant(( int )1 ) );
  QgsExpression::setSpecialColumn( "$numfeatures", QVariant(( int )0 ) );
  QgsExpression::setSpecialColumn( "$atlasfeatureid", QVariant(( int )0 ) );
  QgsExpression::setSpecialColumn( "$atlasfeature", QVariant::fromValue( QgsFeature() ) );
  QgsExpression::setSpecialColumn( "$atlasgeometry", QVariant::fromValue( QgsGeometry() ) );
}
开发者ID:Aladar64，项目名称:QGIS，代码行数:20，代码来源:qgsatlascomposition.cpp


示例20: lock

bool QgsFeaturePool::get( QgsFeatureId id, QgsFeature &feature )
{
  QMutexLocker lock( &mLayerMutex );
  QgsFeature *pfeature = mFeatureCache.object( id );
  if ( pfeature )
  {
    //feature was cached
    feature = *pfeature;
  }

  // Feature not in cache, retrieve from layer
  pfeature = new QgsFeature();
  // TODO: avoid always querying all attributes (attribute values are needed when merging by attribute)
  if ( !mLayer->getFeatures( QgsFeatureRequest( id ) ).nextFeature( *pfeature ) )
  {
    delete pfeature;
    return false;
  }
  //make a copy of pfeature into feature parameter
  feature = QgsFeature( *pfeature );
  //ownership of pfeature is transferred to cache
  mFeatureCache.insert( id, pfeature );
  return true;
}
开发者ID:CS-SI，项目名称:QGIS，代码行数:24，代码来源:qgsfeaturepool.cpp



注：本文中的QgsFeature函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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