Summary
In this paper a sketch recognition language is proposed in which template objects are described by their component primitives and geometric constraints between them; For instance, a stick figure consists of a circle connected to a line, which is itself connected to four other lines.
The shapes consist of parts such as lines, constraints such as being parallel or intersections, aliases, editing and display properties.
Once the structural description have been entered using LADDER language, they can be automatically transformed into shape recognizers.
The paper brings examples of applying the framework to UML diagrams. The framework, also encompass a library of predefined shapes (line, curve, ellipse) and constrains ( collinear, tangent, acute ).
Discussion
LADDER is a tool which is valuable to many domains as long as the time it takes to precisely define all the shapes is justified. However as part of its future work, it can pose automatic description generation for complex shapes.
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