Comments:
Danielle
Summary:
LADDER is a sketching language used to describe how diagrams in a domain are drawn, displayed, and edited. With LADDER, creating a sketch system for a new domain is simply a matter of writing a domain description. Such a description should include what the shapes look like and how they should be displayed and edited. Low-level shapes can be reused to create more complex shapes, thus simplifying the domain description. Users can also specify hard and soft constraints in order to better recognize different shapes or their subsets. LADDER shapes must have a graphical grammar, be distinguishable based only on LADDER's supported constraints, and have limited detail (thus aiding recognition and saving time).
The constraints that LADDER affords can be custom made or selected from the initial set. Examples include parallel, contains, above, and posSlope. Users can also specify editing options that override shape recognition, and can view beautified versions of drawn shapes. LADDER is the first language that allows users to specify how shapes are recognized, displayed, and edited.
Discussion:
I like the fact that some of the initial domains tested with LADDER are ones that we have worked with again in our class. The complexity of COA diagrams was definitely increased in the data sets we were viewing! Anyway, LADDER is pretty awesome. Every sketch assignment that I have worked on used it, and thus it is hard for me to imagine not thinking in terms of constraints and subshapes.
Ladder is cool, almost every researhers working on syntactic pattern recogniton refer to this paper. But the speed is the most important problem, which also the problem in syntatic and structural recogniton.
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