/[libvob]/libvob/doc/design.rst
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revision 1.1 by tjl, Mon Feb 24 11:33:14 2003 UTC revision 1.2 by benja, Sun Mar 16 14:55:26 2003 UTC
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2  Design of LibVob  Design of LibVob
3  ===========================  ===========================
4    
5  The fundamental design goal of the LibVob toolkit is to allow  The goal of the LibVob toolkit is to allow
6  smooth interpolation between independent views as well as  interpolation between independently programmed views as well as
7  drawing connections between objects cross-cutting the view hierarchy.  drawing 'cross-cutting' connections between objects
8    in different places of the view hierarchy.
9    (For example, a connection between objects in two
10    different windows would be 'cross-cutting' as it
11    connects two different places in the hierarchy.)
12    
13  This distinguishes the Vob system from normal scene graphs:  This distinguishes the Vob system from normal scene graphs:
14  instead of one global scene graph, there are *keyframe* scene  instead of one global scene graph, there are *keyframe* scene
15  graphs.  graphs.
16  After each discrete user action, a new scene graph is generated  After each discrete user action (like a key press or mouse click),
17    a new scene graph is generated
18  by the user-specified *view*.  by the user-specified *view*.
19  Then, the previous keyframe is smoothly animated into the  Then, the previous keyframe is animated into the
20  new keyframe to allow the user to keep track of all changes.  new keyframe to allow the user to keep track of all changes.
21  The animation is governed by *keys* associated with the  The animation is governed by *keys* associated with the
22  visible objects; the keys are taken from the underlying  visible objects; an object in the first scene graph
23  model and enable two independently developed views to still  is animated to an object in the second scene graph
24  smoothly interpolate into each other.  if both have the same key. The keys are taken from the same
25    underlying model (for example, they could be cells in a
26    spreadsheet) and enable two independently developed views
27    to be interpolated to each other (for example, two different
28    ways to render spreadsheet data in a graph).
29    
30  Continuous user actions (e.g. zooming/panning with the mouse)  Continuous user actions (e.g. zooming/panning with the mouse)
31  are treated more conventionally by editing the parameters of  are treated more conventionally by editing the parameters of

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