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jQuery 1.9.1, HTML, CSS, JavaScript, jQuery UI 1.9.2
finds the polygon including a particular point
jQuery 2.2.3, HTML, CSS, JavaScript
jQuery 2.1.4, HTML, CSS, JavaScript, jQuery UI 1.11.4
From http://jsbin.com/quqega/37/edit?html,js,output see http://stackoverflow.com/questions/29382782/problems-with-vector-reflection-with-particle-collisions
jQuery 1.9.1, HTML, CSS, JavaScript
jQuery 1.11.0, HTML, CSS, JavaScript