基于Petri网的图标编程系统

为了描述图标间的相互作用和它们的动态行为，作者提出了一个基于Ｐｅｔｒｉ网的图标编程系统。本文首先给出了四类基本图标的形式定义；接着，讨论了该系统各构件的功能并设计了网分析图的生成算法；最后，结合例子说明图标库、知识库、语法库、动态运行库等系统构件在图标编程阶段、可执行代码生成及运行阶段的协同工作过程。该系统原型在ＳＧＩ图形工作站ＵＮＩＸ环境中的运行试验表明：与时态逻辑相比，无论在编程阶段还是程序运

ICONIC PROGRAMMING SYSTEM BASED ON PETRI NET

To describe the interactions among icons and their dynamic behaviors, a Petri net-based iconic programming system is presented. First, the formal definitions of 4 basic class icons are given. Second, the functions of system components are discussed and an algorithm to generate net analysis graph is designed. Finally, it is illustrated by an example how the system components (icon-library, knowledge-base, grammar-base, dynamic running-base, etc) cooperate during the iconic programming, code generation and execution. A system prototyping supported by UNIX for SGI graphics workstation has been implemented. It is shown by preliminary experimental trials to this prototyping that no matter iconic programming or code execution, Petri net is more effective on the visualization programming than temporal logic.