Extend the path to a point. If this method is called on a 2D line, the line will be forced to 3D with a default Z value of 0.0.
xcoord (float) – The x coordinate of the point to be extended to.
ycoord (float) – The y coordinate of the point to be extended to.
zcoord (float) – The z coordinate of the point to be extended to.
None