Add pig tails.

[theodore-norvell]

Currently the ports for or and exclusive or's are strangely located. If we drew ports as short lines that extend from the component's body out to its bounding box we could consiently draw the ports on the bounding box. An or-gate and and and-gate, each with three ports would look like this. (Green boxes represents the boundng box).

[theodore-norvell]

By drawing the ports first, any parts of the pigtails that fall within the component's outline will be overdrawn by component, as long as we fill components with an opaque colour. So there is no need for fancy calculations about where the pigtail should end. just make it kind of long.

Unfortunately placing the negation circles isn't quite so easy on the input side of or-gates and xor-gates gates.