Concurrency control in groupware systems
SIGMOD '89 Proceedings of the 1989 ACM SIGMOD international conference on Management of data
Applications of spatial data structures: Computer graphics, image processing, and GIS
Applications of spatial data structures: Computer graphics, image processing, and GIS
The design and analysis of spatial data structures
The design and analysis of spatial data structures
We-met (window environment-meeting enhancement tools)
CHI '91 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Interacting with Computers
A selective undo mechanism for graphical user interfaces based on command objects
ACM Transactions on Computer-Human Interaction (TOCHI)
A framework for undoing actions in collaborative systems
ACM Transactions on Computer-Human Interaction (TOCHI)
An integrating, transformation-oriented approach to concurrency control and undo in group editors
CSCW '96 Proceedings of the 1996 ACM conference on Computer supported cooperative work
ACM Transactions on Computer-Human Interaction (TOCHI)
COCA: collaborative objects coordination architecture
CSCW '98 Proceedings of the 1998 ACM conference on Computer supported cooperative work
Reducing the problems of group undo
GROUP '99 Proceedings of the international ACM SIGGROUP conference on Supporting group work
Undo any operation at any time in group editors
CSCW '00 Proceedings of the 2000 ACM conference on Computer supported cooperative work
Undoing any operation in collaborative graphics editing systems
GROUP '01 Proceedings of the 2001 International ACM SIGGROUP Conference on Supporting Group Work
Consistency maintenance in real-time collaborative graphics editing systems
ACM Transactions on Computer-Human Interaction (TOCHI)
Research on Reliable Communication in Real-Time Collaborative Designing Systems
DCW '02 Revised Papers from the 4th International Workshop on Distributed Communities on the Web
A Multi-version Approach to Conflict Resolution in Distributed Groupware Systems
ICDCS '00 Proceedings of the The 20th International Conference on Distributed Computing Systems ( ICDCS 2000)
Rejoining Collaborative Graphics Editing in Ubiquitous Environments
Computer Supported Cooperative Work in Design IV
Coordination for multi-person visual program development
Journal of Visual Languages and Computing
CRIWG'05 Proceedings of the 11th international conference on Groupware: design, Implementation, and Use
Predicting user interest region for collaborative graphics design systems in ubiquitous environment
CRIWG'06 Proceedings of the 12th international conference on Groupware: design, implementation, and use
A group Undo/Redo method in 3D collaborative modeling systems with performance evaluation
Journal of Network and Computer Applications
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Bitmap-based collaborative graphics editing systems are a special class of real-time collaborative editing systems. Undo is an important and difficult problem in these systems. Existing solutions show low efficiency because additional space cost should be added to achieve the function of undo. In this paper, we propose a new solution to resolve the undo problem. The basic idea is to reduce space cost through exploring relations among operations. The algorithm given in the paper can undo any operation at any time, and can greatly reduce the space cost while increasing a few time cost. The issues about undo scope and undo mode are also discussed in the paper.