Algorithm -- Triangulating a Monotone Polygon -- Adding Diagonals

• if v_j is on the chain opposite to the reflex vertices on the stack
• v_j must be the lower endpoind of a single edge e bounding the funnel
• we can add diagonals from v_j to all vertices on the stack except the last one (bottom of the stack)
• the last vertex on the stack is the top endpoint of e, so it is already connected to v_j
• so
• pop all vertices off the stack and connect them to v_j (except the last one)
• push v_j and the lowest reflex vertex onto the stack

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