Reference TCurve2

  TCurve2 = record
  public
    { Build a curve from a polygon computing distances between points }
    class operator Implicit(const Value: TPolygon): TCurve2;
    { Return the points of the curve as a polygon }
    class operator Explicit(const Value: TCurve2): TPolygon;
    { Find a heading normal at a distance along the curve }
    function FindNormal(Dist: Float): TVec2;
    { Find a point at a distance along the curve }
    function FindPoint(Dist: Float): TVec2;
    { Total distance over the curve }
    Distance: Float;
    { Distances between each point }
    D: TVec1Array;
    { Approximated points over the curve }
    P: TVec2Array;
  end;