| 摘要 |
A graphic programming system for associating distinctive arrow appearances to specific transaction(s) that the arrow may convey among and between on-screen objects. The distinctive appearance features include arrow color, arrow style, and double-headed arrows, among many other possibilities. The system provides default relationships between specific arrow transactions and arrow appearance, so that, for example, a arrow of a particular color is recognized by the system (and easily identified by the user) to carry out a particular transaction. These relationships may be selectively varied by the user to suit individual needs.
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