In this paper we describe a layered approach, which allows the adaptation of the visualization content according to the user's needs using meta-data. In contrast to existing approaches, the educator can adjust both the level of explanation and the level of interactivity of an animation, thus influencing the presentation and the results of the algorithms being illustrated according to a desired level of functionality and appearance, suitable for the specific needs of the learner. Our approach is similar to a middleware approach.
In this three-tier model, the lowest layer of this paradigm suits the programmer. On the middle layer, which is composed of various services common to all educational animations, such as management of data, control, interaction level and presentation, acts the educator. The user interface of the current educational visualization is the top-layer medium with which the end-user (learner) interacts.
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