| 摘要 |
A constraint based graphic system and method for creating graphic layouts of constraints-related graphic objects. The graphic objects are defined in a "constraint hierarchy". The constraint hierarchy defines graphic object in terms of predetermined object "primitives" (such as rectangles, circles and lines) whose parameters may be constants, variables, functions, or parameters of other objects. Unique grouping, indexing, listing and logic functions that allow individual objects or groups of objects to be defined or constrained by the defining functions and attributes of other objects or groups of objects or by constants, variables and other functions are facilitated. Arguments of the functions may include single valued and "list valued" variables.
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