ArcObjects Library Reference (Maplex)

IMaplexOverposter Interface

Provides access to members that control the Maplex Overposter.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server. Requires Maplex Extension.

Description

The MaplexOverposter object provides a wrapper around the Maplex placement engine, hiding the details of the text placement algorithms. To use the overposter first initialize it with parameters such as the map extent, spatial reference, display object, track cancel object, and overposter properties. Then call AddFeature() to add the features to the overposter. Call PlaceLabels() to start processing, and when this method returns, retrieve the results using the PlacedLabels and UnplacedLabels enumerators.

Note that MaplexOverposter does not generate events to fire back labels as they are placed, like the BasicOverposter. You retrieve all of the placed labels at the end of a placement run. MaplexOverposter determines the font metrics for you, so you dont need to supply the label size.

This interface is designed for low level access to the placement algorithms of the MaplexOverposter. The labeling maps and features, use the MaplexAnnotateMap and MaplexAnnoateFeature objects. They wrap calls to the MaplexOverposter into a more general form for use with layers and maps.

Members

		Description
	AddBarriers	Adds a barrier object that placed objects must avoid.
	AddClass	Adds a class to the overposter and specifies its properties.
	AddFeature	Adds a feature with its associated label (optional) to the overposter.
	AddSymbol	Adds a symbol to be placed.
	Capabilities	Overposter capabilities for the specified layer.
	ClassCount	The number of classes.
	Initialize	Initializes the overposter for drawing into the specified area of the map display.
	PlacedLabelCount	The number of unplaced labels. Only valid after calling PlaceObjects.
	PlacedLabels	Enumeration of placed labels.
	PlaceLabels	Places labels using the overposter.
	ResetClasses	Removes all classes from the overposter.
	UnplacedLabelCount	The number of unplaced labels. Only valid after calling PlaceObjects.
	UnplacedLabels	Enumeration of unplaced labels.

CoClasses that implement IMaplexOverposter

CoClasses and Classes	Description
MaplexOverposter	A label placement engine based on the Maplex label placement algorithms.