Docs · Tower

Pipelines tab DAG: edge routing before the “attach to node sides” change

Saved 2026-09-24 so the change can be reverted. The last commit with this behaviour is 0261e6c on main, so git checkout 0261e6c -- plugin/src/PipelineDag.tsx plugin/src/PipelineRunList.tsx restores it (also copy both into backstage/packages/app/src/modules/tower/).

Full DAG - plugin/src/PipelineDag.tsx

Constants: NODE_W=150 NODE_H=56 COL_GAP=90 ROW_GAP=24 PAD=32 FINALLY_EXTRA=50 ELBOW_GAP=18. pos holds each node’s center. Edges were drawn center-to-center (so they began/ended underneath the node boxes); the finally-elbow x was the rightmost leaf’s right edge + ELBOW_GAP.

const finallyElbowX = useMemo(() => {
  const xs = layout.edges.filter(e => e.finally).map(e => pos.get(e.from)?.x).filter((x): x is number => x !== undefined);
  return xs.length ? Math.max(...xs) + NODE_W / 2 + ELBOW_GAP : undefined;
}, [layout, pos]);

// per edge, a = pos(from) center, b = pos(to) center
if (e.finally && finallyElbowX !== undefined) {
  const mx = (finallyElbowX + b.x) / 2;
  d = `M ${a.x} ${a.y} L ${finallyElbowX} ${a.y} C ${mx} ${a.y}, ${mx} ${b.y}, ${b.x} ${b.y}`;
} else {
  const mx = (a.x + b.x) / 2;
  d = `M ${a.x} ${a.y} C ${mx} ${a.y}, ${mx} ${b.y}, ${b.x} ${b.y}`;
}

Stroke t.line, width 1.5, dashed 3 3 for finally edges.

Mini pipeline - plugin/src/PipelineRunList.tsx (MiniDag)

Straight line between dot centers; dots r = 4 when running else 3.2:

return <line key={i} x1={a.x} y1={a.y} x2={b.x} y2={b.y} stroke={t.line} strokeWidth={1} />;