Luís Carriço
Nuno Guimarães
ABSTRACT
This paper addresses the direct manipulation of concept maps. These maps are visually supported by graph-based diagrams. Constraints on nodes, visual attributes and arcs, reflect the syntax and semantic of the underlying conceptual model. Tools allowing the manipulation of concept maps convey these constraints by offering simple feedback hints to user actions. Particular application domains require the use of spatial regions (contexts) to convey equivalence on concept properties or types. In these cases, further restrictions are imposed. Therefore, richer feedback must be supported for effective direct manipulation.The paper proposes an approach to handle spatial contexts in concept maps. The approach provides means to define enhanced feedback on direct manipulation of concepts and relations within and over context boundaries. The technique is based on the separtion of the feedback representations for device and action. It controls their relative distance, mobility and visual attributes. Manipulation of contexts and simultaneous views over contexts are also discussed. Specific behaviors are proposed and a technique to offer coherent views on multiple contexts is presented. The architecture of the system that supports these features is described.
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