QGIS API Documentation  2.15.0-Master (af20121)
Class Hierarchy

Go to the graphical class hierarchy

This inheritance list is sorted roughly, but not completely, alphabetically:
[detail level 12345678]
 C_nmeaGPGGAGGA packet information structure (Global Positioning System Fix Data)
 C_nmeaGPGSAGSA packet information structure (Satellite status)
 C_nmeaGPGSVGSV packet information structure (Satellites in view)
 C_nmeaGPRMCRMC packet information structure (Recommended Minimum sentence C)
 C_nmeaGPVTGVTG packet information structure (Track made good and ground speed)
 C_nmeaINFOSummary GPS information from all parsed packets, used also for generating NMEA stream
 C_nmeaPOSPosition data in fractional degrees or radians
 C_nmeaSATELLITEInformation about satellite
 C_nmeaSATINFOInformation about all satellites in view
 C_nmeaTIMEDate and time data
 CQgsAggregateCalculator::AggregateParametersA bundle of parameters controlling aggregate calculation
 CQgsSQLComposerDialog::ArgumentArgument of a function
 CQgsAdvancedDigitizingDockWidget::CadConstraintThe CadConstraint is an abstract class for all basic constraints (angle/distance/x/y)
 CQgsMapCanvas::CanvasPropertiesDeprecated to be deleted, stuff from here should be moved elsewhere
 CQgsAttributeTableConfig::ColumnConfigDefines the configuration of a column in the attribute table
 CQgsLayerDefinition::DependencySorterClass used to work with layer dependencies stored in a XML project or layer definition file
 CQgsImageOperation::DistanceTransformPropertiesStruct for storing properties of a distance transform operation
 Cpal::FeatsFor usage in problem solving algorithm
 CQgsVectorLayerFeatureIterator::FetchJoinInfoJoin information prepared for fast attribute id mapping in QgsVectorLayerJoinBuffer::updateFeatureAttributes()
 CQgsVectorFileWriter::FieldValueConverterInterface to convert raw field values to their user-friendly value
 CQgsExpression::FunctionA abstract base class for defining QgsExpression functions
 CQgsSQLComposerDialog::FunctionDescription of server functions
 CGEOSGeomScopedPtrScoped GEOS pointer
 Cpal::InternalExceptionVarious Exceptions
 CQgsConnectionPoolGroup< T >::Item
 CQgsAlignRaster::ItemDefinition of one raster layer for alignment
 Cpal::LabelInfoOptional additional info about label (for curved labels)
 Cpal::LayerA set of features which influence the labelling process
 CQgsSnappingUtils::LayerConfigConfigures how a certain layer should be handled in a snapping operation
 CQgsInterpolator::LayerDataA layer together with the information about interpolation attribute / z-coordinate interpolation and the type (point, structure line, breakline)
 CQgsLayerTreeModel::LayerLegendDataStructure that stores all data associated with one map layer
 CQgsLayerTreeModel::LayerLegendTreeStructure that stores tree representation of map layer's legend
 CQgsAccessControlFilter::LayerPermissionsDescribe the layer permission
 CQgsGmlStreamingParser::LayerPropertiesLayer properties
 CQgsOgcUtils::LayerPropertiesLayer properties
 CLayerRenderJobStructure keeping low-level rendering job information
 CLine3DThis class represents a line
 CQgsPointLocator::MatchFilterInterface that allows rejection of some matches in intersection queries (e.g
 CQgsExpression::NamedNodeNamed node
 CNodeNode is a class used by Line3D
 CQgsSQLStatement::NodeAbstract node class
 CQgsSQLStatement::NodeListList of nodes
 CQgsFeatureRequest::OrderByClauseOrder by clause for a QgsFeatureRequest
 Cpal::PalMain Pal labelling class
 Cpal::PalExceptionVarious Exceptions
 Cpal::PalStatSummary statistics of labelling problem
 CQgsExpression::ParameterRepresents a single parameter passed to a function
 CParametricLineParametricLine is an Interface for parametric lines
 CPoint3DPoint3D is a class to represent a three dimensional point
 Cpal::PolygonCostCalculatorData structure to compute polygon's candidates costs
 CQgsVisibilityPresetCollection::PresetRecordIndividual preset record of visible layers and styles
 Cpal::ProblemRepresentation of a labeling problem
 CQgsAlignRaster::ProgressHandlerHelper struct to be sub-classed for progress reporting
 CQEvent [external]
 CQFutureWatcher< QVector< QgsDataItem * > > [external]
 CQGisGlobal constants for use throughout the application
 CQgisPluginAbstract base class from which all plugins must inherit
 CQGraphicsItem [external]
 CQgsAbstractCacheIndexAbstract base class for cache indices
 CQgsAbstractFeatureIteratorInternal feature iterator to be implemented within data providers
 CQgsAbstractFeatureSourceBase class that can be used for any class that is capable of returning features
 CQgsAbstractGeometrySimplifierAbstract base class for simplify geometries using a specific algorithm
 CQgsAbstractGeometryV2Abstract base class for all geometries
 CQgsAbstractLabelProviderInterface class
 CQgsAbstractVectorLayerLabelingAbstract base class - its implementations define different approaches to the labeling of a vector layer
 CQgsAccessControlFilterClass defining access control interface for QGIS Server plugins
 CQgsActionUtility class that encapsulates an action based on vector attributes
 CQgsActionManagerStorage and management of actions associated with a layer
 CQgsAggregateCalculatorUtility class for calculating aggregates for a field (or expression) over the features from a vector layer
 CQgsAlignRasterQgsAlignRaster takes one or more raster layers and warps (resamples) them so they have the same:
 CQgsAttributeEditorContextThis class contains context information for attribute editor widgets
 CQgsAttributeTableConfigThis is a container for configuration of the attribute table
 CQgsAuthCertUtilsUtilities for working with certificates and keys
 CQgsAuthConfigSslServerConfiguration container for SSL server connection exceptions or overrides
 CQgsAuthCryptoFuntions for hashing/checking master password and encrypt/decrypting data with password
 CQgsAuthGuiUtilsUtility functions for use by authentication GUI widgets or standalone apps
 CQgsAuthMethodConfigConfiguration storage class for authentication method configurations
 CQgsAuthMethodMetadataHolds data auth method key, description, and associated shared library file information
 CQgsAuthMethodRegistryA registry / canonical manager of authentication methods
 CQgsClipperA class to trim lines and polygons to within a rectangular region
 CQgsColorGridActionA color swatch grid which can be embedded into a menu
 CQgsColorSchemeAbstract base class for color schemes
 CQgsColorSchemeRegistryRegistry of color schemes
 CQgsComposerAttributeTableCompareHelper class for sorting tables, takes into account sorting column and ascending / descending
 CQgsComposerAttributeTableCompareV2Helper class for sorting tables, takes into account sorting column and ascending / descending
 CQgsComposerLegendStyleComposer legend components style
 CQgsComposerMapItemStackA collection of map items which are drawn above the map content in a QgsComposerMap
 CQgsComposerTableStyleStyling option for a composer table cell
 CQgsComposerUtilsUtilities for compositions
 CQgsConditionalLayerStylesHolds conditional style information for a layer
 CQgsConditionalStyleConditional styling for a rule
 CQgsConnectionPool< T, T_Group >Template class responsible for keeping a pool of open connections
 CQgsConnectionPoolGroup< T >Template that stores data related to one server
 CQgsContrastEnhancementManipulates raster pixel values so that they enhanceContrast or clip into a specified numerical range according to the specified ContrastEnhancementAlgorithm
 CQgsContrastEnhancementFunctionA contrast enhancement funcion is the base class for all raster contrast enhancements
 CQgsCoordinateReferenceSystemClass for storing a coordinate reference system (CRS)
 CQgsCoordinateTransformCacheCache coordinate transform by authid of source/dest transformation to avoid the overhead of initialization for each redraw
 CQgsCredentialsInterface for requesting credentials in QGIS in GUI independent way
 CQgsDataDefinedA container class for data source field mapping or expression
 CQgsDataItemProviderThis is the interface for those who want to add custom data items to the browser tree
 CQgsDataItemProviderRegistryThis singleton class keeps a list of data item providers that may add items to the browser tree
 CQgsDataSourceURIClass for storing the component parts of a PostgreSQL/RDBMS datasource URI
 CQgsDateTimeStatisticalSummaryCalculator for summary statistics and aggregates for a list of datetimes
 CQgsDatumTransformStoreKeeps track of datum transformations as chosen by the user
 CQgsDetailedItemDataThis class is the data only representation of a QgsDetailedItemWidget, designed to be used in custom views
 CQgsDiagramBase class for all diagram types
 CQgsDiagramLayerSettingsStores the settings for rendering of all diagrams for a layer
 CQgsDiagramRendererV2Evaluates and returns the diagram settings relating to a diagram for a specific feature
 CQgsDiagramSettingsStores the settings for rendering a single diagram
 CQgsDistanceAreaGeneral purpose distance and area calculator
 CQgsEdgeProperterQgsEdgeProperter is a strategy pattern
 CQgsEditorWidgetFactoryEvery attribute editor widget needs a factory, which inherits this class
 CQgsErrorQgsError is container for error messages (report)
 CQgsErrorMessageQgsErrorMessage represents single error message
 CQgsExceptionDefines a qgis exception class
 CQgsExpressionClass for parsing and evaluation of expressions (formerly called "search strings")
 CQgsExpressionContextExpression contexts are used to encapsulate the parameters around which a QgsExpression should be evaluated
 CQgsExpressionContextScopeSingle scope for storing variables and functions for use within a QgsExpressionContext
 CQgsExpressionContextUtilsContains utilities for working with QgsExpressionContext objects, including methods for creating scopes for specific uses (eg project scopes, layer scopes)
 CQgsExpressionFieldBufferBuffers information about expression fields for a vector layer
 CQgsFeatureThe feature class encapsulates a single feature including its id, geometry and a list of field/values attributes
 CQgsFeatureFilterProviderAbstract interface for use by classes that filter the features of a layer
 CQgsFeatureIteratorWrapper for iterator of features from vector data provider or vector layer
 CQgsFeatureRequestThis class wraps a request for features to a vector layer (or directly its vector data provider)
 CQgsFeatureStoreContainer for features with the same fields and crs
 CQgsFieldEncapsulate a field in an attribute table or data source
 CQgsFieldsContainer of fields for a vector layer
 CQgsFilterLegendButtonA tool button that allows enabling or disabling legend filter by contents of the map
 CQgsGeometryA geometry is the spatial representation of a feature
 CQgsGeometryAnalyzerThe QGis class provides vector geometry analysis functions
 CQgsGeometryEditUtilsConvenience functions for geometry editing
 CQgsGeometryEngineContains geometry relation and modification algorithms
 CQgsGeometryFactoryContains geometry creation routines
 CQgsGeometryUtilsContains various geometry utility functions
 CQgsGmlStreamingParserThis class builds features from GML data in a streaming way
 CQgsGPSConnectionRegistryA singleton class to register / unregister existing GPS connections such that the information is available to all classes and plugins
 CQgsGradientStopRepresents a color stop within a gradient color ramp
 CQgsGraphMathematics graph representation
 CQgsGraphAnalyzerThe QGis class provides graph analysis functions
 CQgsGraphArcThis class implement a graph edge
 CQgsGraphBuilderInterfaceDetermine interface for creating a graph
 CQgsGraphVertexThis class implement a graph vertex
 CQgsGridFileWriterA class that does interpolation to a grid and writes the results to an ascii grid
 CQgsHistogramCalculator for a numeric histogram from a list of values
 CQgsImageOperationContains operations and filters which apply to QImages
 CQgsIndexedFeatureTemporarily used structure to cache order by information
 CQgsInternalGeometryEngineThis class offers geometry processing methods
 CQgsInterpolatorInterface class for interpolations
 CQgsInterruptionCheckerInterface that can be optionaly attached to an iterator so its nextFeature() implementaton can check if it must stop as soon as possible
 CQgsIntervalA representation of the interval between two datetime values
 CQgsJSONExporterHandles exporting QgsFeature features to GeoJSON features
 CQgsJSONUtilsHelper utilities for working with JSON and GeoJSON conversions
 CQgsLabelA class to render labels
 CQgsLabelAttributesA class to store attributes needed for label rendering
 CQgsLabelComponentMaintains current state of more grainular and temporal values when creating/painting component parts of an individual label (e.g
 CQgsLabelFeatureDescribes a feature that should be used within the labeling engine
 CQgsLabelingEngineInterfaceLabeling engine interface
 CQgsLabelingEngineV2Map labeling functionality
 CQgsLabelingResultsClass that stores computed placement from labeling engine
 CQgsLabelingUtilsContains helper utilities for working with QGIS' labeling engine
 CQgsLabelSearchTreeA class to query the labeling structure at a given point (small wraper around pal RTree class)
 CQgsLayerDefinitionHolds generic methods for loading/exporting QLR files
 CQgsLayerTreeUtilsAssorted functions for dealing with layer trees
 CQgsLayerTreeViewMenuProviderImplementation of this interface can be implemented to allow QgsLayerTreeView instance to provide custom context menus (opened upon right-click)
 CQgsLegendRendererHandles automatic layout and rendering of legend
 CQgsLegendSettingsStores the appearance and layout settings for legend drawing with QgsLegendRenderer
 CQgsLegendSymbolItemV2The class stores information about one class/rule of a vector layer renderer in a unified way that can be used by legend model for rendering of legend
 CQgsLoggerQgsLogger is a class to print debug/warning/error messages to the console
 CQgsMapCanvasLayerA class that stores visibility and presence in overview flags together with pointer to the layer
 CQgsMapCanvasSnapperThis class reads the snapping properties from the current project and configures a QgsSnapper to perform the snapping
 CQgsMapHitTestClass that runs a hit test with given map settings
 CQgsMapLayerLegendUtilsMiscellaneous utility functions for handling of map layer legend
 CQgsMapLayerRendererBase class for utility classes that encapsulate information necessary for rendering of map layers
 CQgsMapLayerStyleStores style information (renderer, transparency, labeling, diagrams etc.) applicable to a map layer
 CQgsMapServiceExceptionException class for WMS service exceptions
 CQgsMapSettingsConfiguration for rendering of the map
 CQgsMapTipA maptip is a class to display a tip on a map canvas when a mouse is hovered over a feature
 CQgsMapToPixelPerform transforms between map coordinates and device coordinates
 CQgsMapUnitScaleStruct for storing maximum and minimum scales for measurements in map units
 CQgsMessageOutputInterface for showing messages from QGIS in GUI independent way
 CQgsMultiRenderCheckerThis class allows checking rendered images against comparison images
 CQgsNineCellFilterBase class for raster analysis methods that work with a 3x3 cell filter and calculate the value of each cell based on the cell value and the eight neighbour cells
 CQgsObjectCustomPropertiesSimple key-value store (keys = strings, values = variants) that supports loading/saving to/from XML in
 CQgsOgcUtilsVarious utility functions for conversion between OGC (Open Geospatial Consortium) standards and QGIS internal representations
 CQgsOgcUtilsExprToFilterInternal use by QgsOgcUtils
 CQgsOgcUtilsSQLStatementToFilterInternal use by QgsOgcUtils
 CQgsOgrUtilsUtilities for working with OGR features and layers
 CQgsOSMDatabaseClass that encapsulates access to OpenStreetMap data stored in a database previously imported from XML file
 CQgsOSMElementElements (also data primitives) are the basic components in OpenStreetMap from which everything else is defined
 CQgsOSMNodeIteratorEncapsulate iteration over table of nodes/
 CQgsOSMTagsThis class is a container of tags for a node, way or a relation
 CQgsOSMWayIteratorEncapsulate iteration over table of ways
 CQgsOverlayAnalyzerThe QGis class provides vector overlay analysis functions
 CQgsPaintEffectBase class for visual effects which can be applied to QPicture drawings
 CQgsPaintEffectAbstractMetadataStores metadata about a paint effect class
 CQgsPaintEffectRegistrySingleton registry of available paint effects
 CQgsPkiBundleStorage set for PKI bundle: SSL certificate, key, optional CA cert chain
 CQgsPkiConfigBundleStorage set for constructed SSL certificate, key, associated with an authentication config
 CQgsPluginLayerRegistryRegistry of plugin layers types
 CQgsPluginLayerTypeClass for creating plugin specific layers
 CQgsPointA class to represent a point
 CQgsPointSampleCreates random points in polygons / multipolygons
 CQgsProjectBadLayerHandlerInterface for classes that handle missing layer files when reading project file
 CQgsProjectVersionA class to describe the version of a project
 CQgsPropertyAn Abstract Base Class for QGIS project property hierarchies
 CQgsProviderMetadataHolds data provider key, description, and associated shared library file information
 CQgsProviderRegistryA registry / canonical manager of data providers
 CQgsPythonRunnerUtility class for running python commands from various parts of QGIS
 CQgsRasterRaster namespace
 CQgsRasterBandStatsThe RasterBandStats struct is a container for statistics about a single raster band
 CQgsRasterBlockRaster data container
 CQgsRasterCalculatorRaster calculator class
 CQgsRasterCheckerThis is a helper class for unit tests that need to write an image and compare it to an expected result or render time
 CQgsRasterDrawerThe drawing pipe for raster layers
 CQgsRasterFileWriterThe raster file writer which allows you to save a raster to a new file
 CQgsRasterHistogramThe QgsRasterHistogram is a container for histogram of a single raster band
 CQgsRasterIdentifyResultRaster identify results container
 CQgsRasterInterfaceBase class for processing filters like renderers, reprojector, resampler etc
 CQgsRasterIteratorIterator for sequentially processing raster cells
 CQgsRasterPipeBase class for processing modules
 CQgsRasterPyramidThis struct is used to store pyramid info for the raster layer
 CQgsRasterRangeRaster values range container
 CQgsRasterRendererRegistryRegistry for raster renderers
 CQgsRasterRendererRegistryEntryRegistry for raster renderer entries
 CQgsRasterResamplerInterface for resampling rasters (e.g
 CQgsRasterShaderInterface for all raster shaders
 CQgsRasterShaderFunctionThe raster shade function applies a shader to a pixel at render time - typically used to render grayscale images as false color
 CQgsRasterTransparencyDefines the list of pixel values to be considered as transparent or semi transparent when rendering rasters
 CQgsRasterViewPortThis class provides details of the viewable area that a raster will be rendered into
 CQgsRectangleA rectangle specified with double values
 CQgsReliefProduces colored relief rasters from DEM
 CQgsRenderCheckerThis is a helper class for unit tests that need to write an image and compare it to an expected result or render time
 CQgsRenderContextContains information about the context of a rendering operation
 CQgsRendererCategoryV2Categorized renderer
 CQgsRendererV2AbstractMetadataStores metadata about one renderer class
 CQgsRendererV2RegistryRegistry of renderers
 CQgsRequestHandlerThis class is an interface hiding the details of reading input and writing output from/to a wms request mechanism
 CQgsScaleBarStyleAbstraction of composer scale bar style
 CQgsScaleCalculatorCalculates scale for a given combination of canvas size, map extent, and monitor dpi
 CQgsServerOGC web services
 CQgsServerFilterClass defining I/O filters for QGIS Server and implemented in plugins
 CQgsServerInterfaceQgsServerInterface Class defining interfaces exposed by QGIS Server and made available to plugins
 CQgsSignalBlocker< Object >RAII signal blocking class
 CQgsSimplifyMethodThis class contains information about how to simplify geometries fetched from a QgsFeatureIterator
 CQgsSnapperA class that allows advanced snapping operations on a set of vector layers
 CQgsSnappingResultRepresents the result of a snapping operation
 CQgsSqlExpressionCompilerGeneric expression compiler for translation to provider specific SQL WHERE clauses
 CQgsSQLStatementClass for parsing SQL statements
 CQgsStatisticalSummaryCalculator for summary statistics for a list of doubles
 CQgsStringStatisticalSummaryCalculator for summary statistics and aggregates for a list of strings
 CQgsStringUtilsUtility functions for working with strings
 CQgsSymbolLayerV2AbstractMetadataStores metadata about one symbol layer class
 CQgsSymbolLayerV2RegistryRegistry of available symbol layer classes
 CQgsSymbologyV2ConversionThis class is not a part of public API, it is intended only for compatibility with older versions of QGIS (1.x)
 CQgsToleranceThis is the class is providing tolerance value in map unit values
 CQgsTracerGraphSimple graph structure for shortest path search
 CQgsTransectSampleA class for the creation of transect sample lines based on a set of strata polygons and baselines
 CQgsUnitTypesHelper functions for various unit types
 CQgsVectorA class to represent a vector
 CQgsVectorColorRampV2Abstract base class for color ramps
 CQgsVectorFileWriterA convenience class for writing vector files to disk
 CQgsVectorLayerImportA convenience class for writing vector files to disk
 CQgsVectorLayerToolsMethods in this class are used to handle basic operations on vector layers
 CQgsVectorSimplifyMethodThis class contains information how to simplify geometries fetched from a vector layer
 CQgsVertexIdUtility class for identifying a unique vertex within a geometry
 CQgsVirtualLayerDefinitionClass to manipulate the definition of a virtual layer
 CQgsVirtualLayerDefinitionUtilsUtils class for QgsVirtualLayerDefinition
 CQgsWKBTypesHandles storage of information regarding WKB types and their properties
 CQgsXmlUtilsAssorted helper methods for reading and writing chunks of XML
 CQgsZonalStatisticsA class that calculates raster statistics (count, sum, mean) for a polygon or multipolygon layer and appends the results as attributes
 CQList< OrderByClause > [external]
 CQObject [external]
 CQPaintDevice [external]
 CQPaintEngine [external]
 CQPair< QString, QString > [external]
 CQSharedData [external]
 CQStandardItem [external]
 CQTableWidgetItem [external]
 CQTreeWidgetItem [external]
 CQUndoCommand [external]
 CQVector< QVariant > [external]
 CQgsAlignRaster::RasterInfoUtility class for gathering information about rasters
 Cpal::RTree< FeaturePart *, double, 2, double >
 Cpal::RTree< LabelPosition *, double, 2, double >
 Cpal::RTree< pal::FeaturePart *, double, 2, double, 8, 4 >
 Cpal::RTree< pal::LabelPosition *, double, 2, double >
 Cpal::RTree< QgsLabelPosition *, double, 2, double >
 CQgsRuleBasedRendererV2::RuleThis class keeps data about a rules for rule-based renderer
 CQgsVirtualLayerDefinition::SourceLayerA SourceLayer is either a reference to a live layer in the registry or all the parameters needed to load it (provider key, source, etc.)
 CQgsSQLComposerDialog::SQLValidatorCallbackCallback to do validation check on dialog validation
 CQgsExpressionContextScope::StaticVariableSingle variable definition for use within a QgsExpressionContextScope
 CQgsOWSSourceSelect::SupportedFormatFormats supported by provider
 CQgsSQLComposerDialog::TableSelectedCallbackCallback to do actions on table selection
 CTriangleInterpolatorThis is an interface for interpolator classes for triangulations
 CTriangulationInterface for Triangulation classes
 CVector3DClass Vector3D represents a 3D-Vector, capable to store x-,y- and z-coordinates in double values
 CQgsExpression::VisitorSupport for visitor pattern - algorithms dealing with the expressions may be implemented without modifying the Node classes
 CQgsSQLStatement::VisitorSupport for visitor pattern - algorithms dealing with the statement may be implemented without modifying the Node classes
 CQgsLabelFeature::VisualMarginStores visual margins for labels (left, right, top and bottom)