gtgradtreelayout is a superclass of gtgradhorizontaltreelayout and gtgradverticaltreelayout classes and contains generic tree layout methods and definitions of methods the two subclasses need to redefine.
gtgradtreelayout is a superclass of gtgradhorizontaltreelayout and gtgradverticaltreelayout classes and contains generic tree layout methods and definitions of methods the two subclasses need to redefine. | GtGradAbstractTreeLayout