Programmers may define a line set as an array of polylines to accelerate hit-testing, pathfinding

https://mag-wiki.win/index.php/Copper_Line_Set_Handling_Tips_to_Prevent_Damage_on_Site_10809

Programmers may define a line set as an array of polylines to accelerate hit-testing, pathfinding, and collision detection, using spatial indices to swiftly query segments in large interactive scenes.