Fits a set of paired points with a quadratic curve. Returns the quadratic set of points. Function only called by r_throwchart.
quad(point,before_point,after_point,offSet)
[numeric] or [integer]: A set of points between before and after points.
[numeric] or [integer]: The first point of the curve.
[numeric] or [integer]: The last point of the curve.
[integer]: Single value offset for the graph.
returns the quadratic point equivalent.