摘要
介绍了一种用 Java语言编写 VRML解释器原理 ,这种解释器读入 VRML 2 .0的URL,建立场景树结构和事件路由的内部描述以供浏览器的其他模块调用。一些输入文件分析块包含管理一部分事件路由表和事件队列。因此 ,这项工作不仅包括解释器 ,而且提供了一个比较完备的 VRML API,它包含了描述 VRML实体的类 ,特别是浏览器类 ,其方法供其它模块调用以获得内部的结构和一些基本的系统属性。本文提到 ,如何将一系列的类节点组织起来形成内部的场景结构 ,路由和事件是如何组织起来的 ,VRML 对象是怎样指定的 。
A VRML parser in Java language is presented in this paper. The parser reads an input URL with a VRML 2.0 scene description and creates an inner representation of the scene tree structure and the list of event routes to be used by the other modules of the browser. A part of the input file analysis block contains also the management of the event route list and the event queue. Therefore, this work includes not only the parser, but represents a complete base\|layer called VRML API. It consists of classes representing the entities of VRML, especially those of the class Browser, whose methods serve other modules for obtaining the inner structures and some basic properties of the system. In this paper it will be shown how the inner scene structure is built from instances of class Node, how the route list and event queue are managed, how these and other VRML objects are specified, and how the input file analyser works, etc.
出处
《浙江工业大学学报》
CAS
2003年第2期139-143,共5页
Journal of Zhejiang University of Technology
基金
浙江省自然科学基金资助项目 (6 0 2 0 0 2 )
