Houdini can take a single polygon and extrude it in 3D, along the poly's normal. Can I do an analogous operation in 2D, i.e. extrude an edge on a plane? In the shape below, I want to "extrude" edges A and B outward (left and right, respectively), to create a wider top rectangle (in gray). I'd start with points 1-4 in blue and I want to end with points 1-6 in orange (creating new points is obviously necessary). I can do this with a few SOPs, but is there maybe a single-SOP way to do this?

Do you want this

juejuezi
Do you want this

Yes, thank you. I didn't know Houdini could extrude edges.

if you want to keep a little more procedural, use the poly expand SOP