Function hitTest

dashboard/graph/src/GraphCanvas.tsx:129–133

(px: number, py: number)

    }

    function hitTest(px: number, py: number): SimNode | null {
      const sim = simRef.current;
      if (!sim) return null;
      return hitTestNode(sim.nodes, cameraRef.current, canvas.getBoundingClientRect(), { x: px, y: py });
    }

    function neighborhood(node: SimNode | null): Set<string> | null {
      const sim = simRef.current;