code: function getPt(n1, n2, perc)
  {
      const diff = n2 - n1;
  
      return n1 + (diff * perc);
  }
docs: Calculate a single point for a quadratic bezier curve.
  Utility function used by quadraticBezierCurve.
  Ignored from docs since it is not directly exposed.
  
  @ignore
  @private
  @param {number} n1 - first number
  @param {number} n2 - second number
  @param {number} perc - percentage
  @return {number} the result