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Topology Methods

The following methods allow the application programmer to manipulate topological items.

Many of the methods use a Named Seed. Named Seeds are transient TopoPolygon or TopoLineString items which can be used to perform detailed querying of existing TopoPolygon or TopoLineString items, or to create new TopoPolygon or TopoLineString items. Named Seeds are referenced by an application/customisation supplied textual name, in the same way as Named Lists. Named Seeds are not visible on screen, and are not saved in the dataset they belong to. They can however be copies of visible, saved TopoPolygon or TopoLineString items.

CreateIsoRoute	Creates a MultiLineString item, or LineString item, by following a route in all directions.
IsoRoute	Finds Link and Node items that can be reached from a position, within a given cost.
MeasureRoute	Measures the best route between two positions.
MultiRoute	Measure routes between items in named list.
TopoClean	Cleans up topological Link items.
TopoCombineNamedSeeds	Creates a Named Seed object by doing a Boolean operation on existing Named Seed objects.
TopoConvertToArea	Converts the current open TopoPolygon item into a Polygon item.
TopoConvertToChain	Converts the current open LineString item into a TopoLineString item.
TopoConvertToLine	Converts the current open TopoLineString item into a LineString item.
TopoConvertToPolygon	Converts the current open Polygon item into a topological TopoPolygon item.
TopoCreateArea	Creates a Polygon item from the current open TopoPolygon item.
TopoCreateBoolean	Creates a Named Seed object by doing a Boolean operation on existing TopoPolygon items.
TopoCreateChain	Creates a TopoLineString item from a Named Seed object.
TopoCreateEmptyNamedSeed	Creates a new, empty transient Named Seed object.
TopoCreateLine	Creates a LineString item from the current open TopoLineString item.
TopoCreateLink	Creates a topological Link item, copying the geometry from the current open LineString item.
TopoCreateNamedSeed	Creates a transient Named Seed object from the current open seed item.
TopoCreateNode	Creates a Node item, merging it in to any existing topology.
TopoCreatePoint	Creates a Point item, merging it with any existing topology.
TopoCreatePolygon	Creates a TopoPolygon item from a Named Seed object.
TopoDeleteLink	Deletes the current open Link item.
TopoDeleteNamedSeed	Deletes a transient Named Seed object.
TopoDeleteNode	Deletes or simplifies the current open Node item.
TopoDeletePoint	Deletes or simplifies the current open Point item.
TopoDeleteSeed	Deletes the current open TopoLineString or TopoPolygon item.
TopoEdgeFill	Creates a Named Seed object by following the current open Link item to make a closed loop.
TopoFindRoute	Creates a Named Seed object by route-finding between two Node items within a dataset.
TopoFloodFill	Creates a Named Seed object by flood-filling Links within a dataset.
TopoGetLinkNode	Gets the id of a Node item from the current open Link item.
TopoGetLinkNumSeed	Gets the number of Seed items attached to the current open Link item.
TopoGetLinkSeed	Gets the signed id of a TopoPolygon or TopoLineString item from the current open Link item.
TopoGetNamedSeedDataset	Gets the dataset with which a Named Seed is compatible.
TopoGetNamedSeedLoopLink	Gets the id of a Link item from a Named Seed object.
TopoGetNamedSeedLoopSize	Gets the number of Links referred to by a loop in a Named Seed object.
TopoGetNamedSeedNumLoop	Gets the number of loops in a Named Seed object.
TopoGetNodeLink	Gets the signed id of a Link item from the current open Node item.
TopoGetNodeNumLink	Gets the number of Link items attached to the current open Node item.
TopoGrowNamedSeed	Adds a Link id into a Named Seed object.
TopoIsChain	Tests if a Named Seed object is a TopoLineString.
TopoIsPolygon	Tests if a Named Seed object is a TopoPolygon.
TopoMoveNode	Moves the current open Node item, dragging any connected Link items.
TopoPolygonsFromLinks	Creates TopoPolygon items from a set of links
TopoReverseSeed	Reverses the current open TopoLineString or TopoPolygon item
TopoSetChainSeedPt	Sets the seed point of a TopoLineString item.
TopoSetLinkPt	Sets the position of a vertex in the current open Link item.
TopoSetPolygonSeedPt	Sets the seed point of a TopoPolygon item.
TopoShrinkNamedSeed	Removes a Link item from a Named Seed object.

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