graphene:quad-init (q p0 p1 p2 p3)

q -- a graphene:quad-t instance
p0 -- a graphene:point-t instance for the first point
p1 -- a graphene:point-t instance for the second point
p2 -- a graphene:point-t instance for the third point
p3 -- a graphene:point-t instance for the fourth point

The initialized graphene:quad-t instance.

Initializes a quadrilateral with the given points.