LADDER
Paper:
Hammond, Tracy, and Randall Davis. "LADDER, a sketching language for user interface developers." Computers & Graphics 29.4 (2005): 518-532.
Publication Link: http://www.sciencedirect.com/science/article/pii/S0097849305000865
Summary:
LADDER is a symbolic language to describe how shapes are drawn. The definition of shape has the following parts: List of components, Geometric constraints, Set of aliases, Editing behavior, Display methods. It also creates an abstract behavior as in an abstract class, which is very easy to extend. Some primitive shapes are already defined like path, line, arc etc. Sample constraints are leftOf, horizontal, centeredBelow etc. Vectors are maintained for variable number of components in a shape.
For primitive shape recognition, low-level recognition is performed on the stroke. If it does not provide correct interpretation, domain recognizer will never be able to recognize it. For domain shape recognition, Jess rule is defined to recognize the shape. It is then passed through a constraint solver.
Discussion:
The idea of creating a symbolic language to describe the process of drawing shape is very amazing. It presents a novel idea of creating an abstract behavior as in an abstract class, which is very easy to extend.
Publication Link: http://www.sciencedirect.com/science/article/pii/S0097849305000865
Summary:
LADDER is a symbolic language to describe how shapes are drawn. The definition of shape has the following parts: List of components, Geometric constraints, Set of aliases, Editing behavior, Display methods. It also creates an abstract behavior as in an abstract class, which is very easy to extend. Some primitive shapes are already defined like path, line, arc etc. Sample constraints are leftOf, horizontal, centeredBelow etc. Vectors are maintained for variable number of components in a shape.
For primitive shape recognition, low-level recognition is performed on the stroke. If it does not provide correct interpretation, domain recognizer will never be able to recognize it. For domain shape recognition, Jess rule is defined to recognize the shape. It is then passed through a constraint solver.
Discussion:
The idea of creating a symbolic language to describe the process of drawing shape is very amazing. It presents a novel idea of creating an abstract behavior as in an abstract class, which is very easy to extend.
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