A polylink is a special type of link that has vertices between the two end-nodes. It may be used to define the path of a river, or to indicate a curved pipe, or in any situation where the end-nodes are not connected in a straight path. To create a polylink, select the link tool as normal and hold the
<Ctrl> key down while clicking at the location at which you want a vertex.
An existing link may be converted to a polylink by holding down the
<Ctrl> key and clicking on an existing highlighted link. To re-shape a link drag the vertex of the highlighted link to the new location and release the mouse button. To delete a vertex hold down the
<Shift> keys and click on the vertex you wish to delete.