ObjGraph ObjGraph is a graph of all objects which are reachable from a specific object. ObjGraph methods build an instance of IdArray containing all the object references reachable from that object. Instances of OrdCltn expand and shrink appropriately. Point Point represents two-dimensional coordinates for use with screen graphics. Methods are provided for accessing, setting, and offsetting the x and y coordinates.
Conditional methods test the relative position of two points.
Rectangle Rectangle is the basis for many kinds of graphical entities. A rectangular area is defined in terms of the points at its upper left and lower right corners. Methods are provided to return the full details of a Rectangle's location, to adjust or set the coordinates of the corners, and to create new Points relative to the corners. Set includes methods for adding and removing elements, testing contents, and performing set operations such as intersection, union and difference. Sets are very efficient when used to create symbol tables or in applications that require fast table lookup.