Function shapeTopBottom

shapeTopBottom(
    center: readonly [number, number],
    nodeSize: readonly [number, number],
    start: readonly [number, number],
    end: readonly [number, number],
): [number, number]
a shape that aligns edges with the centered top or bottom of a node

Useful with [tweakShape].
Parameters
- center: readonly [number, number]
- nodeSize: readonly [number, number]
- start: readonly [number, number]
- end: readonly [number, number]
Returns [number, number]
- Defined in tweaks.ts:328