01652nas a2200217   4500000000100000000000100001008004100002260001200043653001500055653003700070653001500107653001600122100001800138700001800156245011500174856009800289300001000387490000600397520101700403022001401420       2013                            d  c09/201310aSimulation10aHuman-Computer Interaction (HCI)10aInterfaces10aRecognition1 aAbílio Costa1 aJoão Pereira00aSketchyDynamics: A Library for the Development of Physics Simulation Applications with Sketch-Based Interfaces  uhttp://www.ijimai.org/journal/sites/default/files/files/2013/06/ijimai20132_3_3_pdf_15923.pdf  a23-300 v23 aSketch-based interfaces provide a powerful, natural and intuitive way for users to interact with an application. By combining a sketch-based interface with a physically simulated environment, an application offers the means for users to rapidly sketch a set of objects, like if they are doing it on piece of paper, and see how these objects behave in a simulation. In this paper we present SketchyDynamics, a library that intends to facilitate the creation of applications by rapidly providing them a sketch-based interface and physics simulation capabilities. SketchyDynamics was designed to be versatile and customizable but also simple. In fact, a simple application where the user draws objects and they are immediately simulated, colliding with each other and reacting to the specified physical forces, can be created with only 3 lines of code. In order to validate SketchyDynamics design choices, we also present some details of the usability evaluation that was conducted with a proof-of-concept prototype  a1989-1660