ArcGIS Developer Help

IGraphicSnapEnvironment Interface

Provides access to members that control the Collection of snap agents used for snapping graphics.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Members

	Name	Description
	AddSnapAgent	Add a new snap agent to the environment.
	ClearSnapAgents	Remove all snap agents.
	DeleteSnapAgent	Remove specified snap agent from the environment.
	SnapAgent	The snap agent at the specified index. The index argument is zero based.
	SnapAgentCount	The number of snap agents.
	SnapAgentOrder	An array of IDs indicating how agents should be ordered.
	SnapShape	Snap the shape using the agents in the environment.
	SnapTolerance	The snap tolerance in page units.

Classes that implement IGraphicSnapEnvironment

Classes	Description
GraphicSnapEnvironment	Collection of Snap Agents used to snap a graphic point.
PageLayout	Page Layout class contains maps and map surrounds.

Remarks

Use the IGraphicSnapEnvironment interface to manage the snap agents of the Pagelayout.

Methods are provided to count, add, delete and clear (delete all) the snap agents. This interface also provides access to the SnapTolerance.

Graphics are snapped into place by calling SnapShape. SnapShape in turn calls IGraphicSnap::SnapX and IGraphicSnap::SnapY on each active snap agent (in the order specified by IGraphicSnapEnvironment::SnapAgentOrder) until one of the snap agents returns True. SnapX and SnapY are separate calls because some agents, such as guides, may only act in one direction.

See also IGraphicSnap and IPageLayoutSnap.