Module ports 

Seat-based ports: discrete connection points packed around a node’s rounded rim, and the curves between them.

This is an alternative to crate::Handle-based anchoring for editors where connections may attach anywhere on a node’s border: a rim offers a whole number of seats one SEAT_PITCH apart, solve_ports packs every connection end into a seat of its own (deterministically, so the same graph always renders the same), and edge_geometry draws the curve between two seats, arrowheads and label anchor included.

Everything here is headless — pure geometry over keyed rectangles — so it can drive custom edge layers, exports and thumbnails alike.

Structs

Anchor

Arrows

Which ends of a connection carry an arrowhead. The plane only needs to know which ends to leave room for; what an arrow means belongs to the application.

EdgeAnchors

EdgeGeometry

Link

PortSeat

One of the discrete places on a node’s rim where a bead may rest.

Enums

Endpoint

Side

Re-exported for convenience: a seat names its face with the shared Side type. A side of a node, used for handle placement, seat naming and edge routing.

Terminal

Constants

CORNER_RADIUS

How rounded a node’s corners are. The stylesheet has to agree with this, or beads will sit off the rim they are packed onto.

DEFAULT_LABEL_POSITION

Where a label rests until it is moved.

MAX_LABEL_POSITION

MIN_LABEL_POSITION

How near a connection’s end a label may be dragged. A label exactly on the end would sit under the arrowhead and the node both.

PORT_RADIUS

The bead’s own radius, which the surface draws and this reserves room for.

SEAT_PITCH

How far apart the seats on a node’s rim are, and so the least room any two beads can have between them.

Functions

clamp_seat

The nearest seat this frame actually has to the one asked for. A node shrunk past one of its own ports leaves that port at the corner rather than off the end of the rim.

edge_geometry

nearest_free_seat

The seat nearest a point that nothing is sitting in yet.

nearest_on_ring

nearest_seat

The seat nearest a point, which is what a dragged bead lands on.

ring_length

ring_point

seat_point

Where a seat sits on the rim, with the outward normal a connection leaves along. The seat names a point on the plain rectangle; the rim itself is rounded, so a corner seat resolves onto its arc.

seats

Every seat a frame offers, walking the rim clockwise from the top-left corner. The four corners belong to the horizontal runs, so no place on the rim is named twice.

solve_ports