query package:diagrams-core
Get the query function associated with a diagram.
A query is a function that maps points in a vector space to values in
some monoid. Queries naturally form a monoid, with two queries being
combined pointwise.
The idea for annotating diagrams with monoidal queries came from the
graphics-drawingcombinators package,
http://hackage.haskell.org/package/graphics-drawingcombinators.
The Query module defines a type for "queries" on diagrams,
which are functions from points in a vector space to some monoid.