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A diagram that displays all the information about a model isn t likely very readable We ve all seen large, complex models with hundreds or thousands of nodes and links that end up looking like a Rorschach inkblot test The overview, zoom, and printing of large wallpaper diagrams can do only so much to help you understand such models We need ways to filter out information that is unnecessary or not of interest UML diagramming tools have some familiar filters, where various levels of detail are shown in Class diagrams, for example Analysis-level
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CHAPTER 4 Developing a DSL Graphical Notation
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detail typically includes only element names, while an implementation view includes visibility, multiplicity, and type information The Mylyn project at Eclipse provides a capability to filter out noise in an Eclipse workspace based on what the developer is actively working on Tasks are associated with workspace elements that remain visible, while other elements are dimmed or hidden altogether Some discussion regards the application of Mylyn technology to diagrams, although nothing has yet been developed Contributions to this area would be welcome because extending this metaphor to modeling in general has great potential GEF provides layering in diagrams, although not much has been done to exploit this mechanism to lift or lay down information on a diagram, as was done historically with transparencies using overhead projectors and today with presentation animation effects We need a more well-defined way of defining diagrams of multiple layers, which could come in handy when considering the decoration of models as they move from more abstract to more concrete during model-driven software-development scenarios This and other ideas to improve the filtering and rationing of information presented on a diagram are points to seriously consider when defining your notation, along with an effective layout algorithm
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413 Layout
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Arguably, the most important factor in providing usable diagrams is layout Layout algorithms are numerous and can be tuned to suit a specific notation, although sometimes custom layouts must be developed Keep in mind that fixed or semifixed layouts might be the best option for certain types of diagrams Our mindmap diagram uses an automatic layout because the last thing the Practitioner wants to do while rapidly brainstorming is stop to adjust the position of a topic using the mouse At the same time, class diagram layouts are fairly mature but still cannot suit the needs of each modeler, so this requires the capability to adjust the position of diagram elements Not many modelers would be satisfied with a fixed-layout class diagram Links cause the difficulty in layout, in most cases Links that cross are often considered bad form, yet jumps in links that cross are not a great solution, either Consider using ellipses ( ) to show that a link exists but is not shown until selected or after a filter is removed Another possibility is to make visible certain types of links during mouseover events, allowing a diagram to easily be viewed in detail but only when desired
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414 Synchronization
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Layout can go a long way toward making diagrams more readable and can even convey semantic information Keep in mind that diagrams represent a view of the underlying model In the case of large, complex models, it s often best to have multiple diagrams, or views, of the model You can use filters to accomplish these views, as mentioned earlier, or the views can be distinct diagram instances that the Practitioner creates The question of synchronicity comes up frequently at this point because sometimes we want the diagram to update automatically based on changes to the underlying model, sometimes we want changes to be made only manually, and sometimes we want a hybrid approach in which elements on the diagram should update but no new elements should be added We explore synchronization options in GMF in Section 1142, Synchronized
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