graphene:point-y (p)

p -- a graphene:point-t instance
y -- a number coerced to a single float for the y coordinate

The accessor for the y slot of the graphene:point-t structure gets or sets the y coordinate of the point. The y value is coerced to a single float before assignment.

(graphene:with-point (p 0.5 1.0) (graphene:point-y p))
=> 1.0
(graphene:with-point (p) (setf (graphene:point-y p) 3/2))
=> 1.5