Adds a point at the position. Appends the point at the end of the line.
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 at the position. Appends the point at the end of the line. 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.