Interface  Description 

Relation 
An object that specifies a directed spatial relationship between
two scene elements.

RelationConstraint 
An object that returns whether a pair of elements satisfies
constraints on the values of a specified relation.

Rule 
A parse rule interface that matches the RHS
of a production and generates the LHS.

Class  Description 

AbstractRule 
A parse rule implementation that matches the RHS
of a production and generates the LHS.

AndConstraint 
A composite constraint that ANDs together the results of its
child constraint objects.

AngleRelation 
Calculate the direction angle (between 0 and 2*PI) between
userspecified sites on a pair of rectangles.

AreaRatioRelation 
Calculate the ratio of areas of the input scene
elements.

BasicConstraint 
An object that returns whether a pair of rectangles satisfies
constraints on the values of a specified relation.

DeltaXRelation 
Calculate the euclidean distance between given sites on pairs of
input rectangles.

DeltaYRelation 
Calculate the euclidean distance between given sites on pairs of
input rectangles.

DistanceRelation 
Calculate the euclidean distance between given sites on pairs of
input rectangles.

Grammar2D 
A grammar is a collection of rules that implement productions and a
collection of tokens that are expected from the lowlevel
recognizer in order for these rules to make sense.

HeightRatioRelation 
Calculate the ratio of the height of the first input
scene element to the height of the second.

NativeResults 
A class that encapsulates the parse results of a native rule so
that native rules do not have to deal with the implementation
details of the parser.

OrConstraint 
A composite constraint that ORs together the results of its
child constraint objects.

OverlapRelation 
Calculate the percentage of one of the rectangles
that overlaps the other.

ParsingSceneRecognizer 
A grammardriven scene recognizer that incrementally parses the
scene as new tokens are added.

RelationUtilities 
A set of static utilties for dealing with relationships between
rectangles, specifying important sites on rectangles, or angular
directions.

SingleRule 
A parse rule implementation that matches the RHS
of a production and generates the LHS.

WidthRatioRelation 
Calculate the ratio of the width of the first input
scene element to the width of the second.

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