[Up: Drawing]

Drawing Tadpoles and Circles


A closed circle can be obtained by connecting the ends of a curved line with each other. One can "re-open" the circle and turn it back to a regular curved line simply by click-and-drag in the vicinity of the "glue point". Once one connects a (single) line to the circle, it becomes a tadpole diagram. While the actual position of the original circle does not change, its glue point gets identified with the new vertex.