基于对象的Any Undo策略  

Object-based any undo model

作　　者：李春萍[1] 窦万峰[2] 

机构地区：[1]玉溪师范学院计算机科学系,云南玉溪653100 [2]南京师范大学数学与计算机科学学院计算机科学系,江苏南京210097

出　　处：《计算机工程与设计》2005年第7期1712-1714,1717,共4页Computer Engineering and Design

基　　金：国家自然科学基金项目(10275035);江苏省教委基金项目(02KJD520006)。

摘　　要：Undo是基于对象的协同图形编辑系统的重要功能,可用于误操作的恢复。Undo的实现极具挑战性,因为分布协同环境下操作具有并发性,Undo的实现与一致性维护密切相关。提出的基于对象的AnyUndo策略从操作语意的角度探讨了Undo操作的一致性维护,并给出了具体的实现机制。给出的支持机制都得到了实例证明,其可行性也在原型系统CoDraftPaint中得到初步验证。Undo is a useful and widely supported feature in object-based collaborative graphics editing systems, which can be used to recover from erroneous operations. Designing a successful undo solution is a great challenge. Since concurrency is the common cause of complication of group editing operations, it is obviously that concurrency control algorithms are related closely with the solutions for undoing any operation at any time, An object-based any undo model is proposed to support consistency preservation of undoing any operation according its rich semantics, This model is implemented on a prototype system, CoDraftPaint,

关 键 词：UNDO/REDO 协同图形编辑系统 一致性维护 几何属性 非几何属性 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]