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 >= $(D 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 >= $(D getPointCount)), the point will be appended at the end of the point list.