Provides access to members that place labels for features using conflict detection. Note: the IOverposter interface has been superseded byIOverposter3. Please consider using the more recent version.
IOverposter is an interface for placing labels and symbols implemented by BasicOveposter (aka the ESRI Standard Label Engine). Follow this general sequence of steps when using this interface:
1. Call AddClass for each class to initialize properties for each class. (InsertClass, RemoveClass, and ResetClasses help manage the classes.)
2. Use Initialize to set up the current extent and display.
3. Call AddBarrier, AddLabel, and/or AddSymbol for each participating feature.
4. Call PlaceObjects to make sure all objects are placed.
5. Use NextPlaced, NextUnplaced, and/or NextUnused to get placed object locations. You will probably want to draw them as you get them.
6. Call ReleaseResources.
This interface is designed for low level access to the placement algorithms of the BasicOverposter. The labeling maps and features, use the AnnotateMap and AnnoateFeature objects. They wrap calls to the BasicOverposter into a more general form for use with layers and maps.
When To Use
The IOverposter interface is a low level interface for managing conflict detection when labeling features.
|AddBarriers||Adds a barrier object that placed objects must avoid.|
|AddClass||Adds a class to the overposter and specifies its properties.|
|AddCurvedLabel||Adds a curved label object to be placed.|
|AddLabel||Adds a label object to be placed.|
|AddSymbol||Adds a symbol to be placed.|
|Capabilities||Overposter capabilities for the specified layer.|
|Initialize||Initializes the overposter for drawing into the specified area of the map display.|
|InsertClass||Inserts a class at a specific index, and specifies its peoperties.|
|NextPlaced||The next object that was successfully placed.|
|NextUnplaced||The next object that was not successfully placed.|
|NextUnused||The next object that was not used.|
|NumberOfPlacedLabels||The number of unplaced labels. Only valid after calling PlaceObjects.|
|NumberOfUnplacedLabels||The number of unplaced labels. Only valid after calling PlaceObjects.|
|NumClasses||The number of classes.|
|PlaceObjects||Places objects using the overposter.|
|ReleaseResources||Releases current objects from memory.|
|RemoveClass||Removes the class at the specified index from the overposter.|
|ResetClasses||Removes all classes from the overposter.|
CoClasses that implement IOverposter
|CoClasses and Classes||Description|
|BasicOverposter||An engine that places labels for features using conflict detection.|