Adds a point to a curve, at "position", with control points "in" and "out".
If "at_position" is given, the point is inserted before the point number "at_position", moving that point (and every point after) after the inserted point. If "at_position" is not given, or is an illegal value (at_position <0 or at_position >= getPointCount), the point will be appended at the end of the point list.
Adds a point to a curve, at "position", with control points "in" and "out". If "at_position" is given, the point is inserted before the point number "at_position", moving that point (and every point after) after the inserted point. If "at_position" is not given, or is an illegal value (at_position <0 or at_position >= getPointCount), the point will be appended at the end of the point list.