Patent ID: 8766987
Filing Date: 2014-07-01
Classification: G06T,G09B

Abstract:
1. A method to animate on a screen a virtual pen, said method configured for generating on said screen an output consisting of said virtual pen writing a drawing or grapheme by means of lines, in such a way that said lines are written slowly on said screen by said virtual pen in order to mimic the way a teacher would write said drawing or grapheme on a blackboard; comprising the steps of: creating the drawing/grapheme as a sequence of line portions separated by knot points, each knot point having at least a pair of coordinates; attributing to each knot point a parameter selected among: kind of interpolation and relative weights, virtual pen status up/down from the writing surface, duration of a possible pause, writing speed downstream of the knot point, thickness of the line downstream of the knot point, or a combination thereof; storing said knot points and said parameters attributed to each knot point for each drawing/grapheme to be written; generating from said stored knot points and parameters an output comprising a determined trajectory that passes through all said knot points; said determined trajectory being formed by visible line portions and invisible line portions between said knot points; said determined trajectory taking into account the values of said parameters of said knot points and/or the values of said parameters interpolated between said knot points; causing said virtual pen to write slowly said determined trajectory to mimic the way a teacher would write said trajectory on a blackboard.