Diagrams/Dev/Migrate0.6
This page describes breaking API changes between diagrams 0.5 and 0.6, along with explanations of how to migrate to the new 0.6 API.
Reorganizations to diagrams-core
- The modules in diagrams-core have all been renamed to be more consistent with the module naming scheme in the rest of the diagrams universe. For most users this should make no different, unless you are affected by diagrams-core#17 and have explicitly imported
Graphics.Rendering.Diagrams.Points
. In particular:Graphics.Rendering.Diagrams --> Diagrams.Core
Grahpics.Rendering.Diagrams.Core --> Diagrams.Core.Types
Graphics.Rendering.Diagrams.* --> Diagrams.Core.*
Subdiagrams
Previous versions of diagrams-core had a mechanism for associating names with a LocatedEnvelope
. Now, names are associated with Subdiagram
s. For example, the type of withName
changed from
withName :: (IsName n, AdditiveGroup (Scalar v), Floating (Scalar v), InnerSpace v, HasLinearMap v) => n -> (LocatedEnvelope v -> QDiagram b v m -> QDiagram b v m) -> QDiagram b v m -> QDiagram b v m
to
withName :: IsName n => n -> (Subdiagram b v m -> QDiagram b v m -> QDiagram b v m) -> QDiagram b v m -> QDiagram b v m
(As you can see, some type class constraints also disappeared, due to the refactoring of the underlying data structure.)
The types of withNameAll
and withNames
changed similarly.
TODO: write more here
Other diagrams-core API changes
TODO: write me
- 'Graphics.Rendering.Diagrams.UDTree' has been split out into a separate 'dual-tree' package (which has also been substantially rewritten).
- 'Graphics.Rendering.Diagrams.{Monoids,MList}' have been split out into a separate 'monoid-extras' package.
- The 'names' function now returns a list of names and their associated locations, instead of the associated subdiagrams. In particular the output is suitable to be rendered to a String using 'show'.
- The new 'subMap' function fills a similar role that 'names' used to play, returning the entire mapping from names to subdiagrams.
- 'juxtaposeDefault' is now the identity on the second object if either one has an empty envelope. In particular this means that 'mempty' is now an identity element for 'beside' and friends.
StyleParam deleted from Diagrams.Backend.Cairo.Text
The StyleParam
type has been removed from Diagrams.Backend.Cairo.Text
. Functions that used to take a StyleParam
argument now take a Style R2
parameter, determining the style to apply to the text before rendering/querying information about the text. These parameters can be created a variety of ways, but the most direct will likely be by applying style-transforming functions such as font
, fontSize
, fontSlant
, and fontWeight
to mempty
. This works because there are instances of HasStyle
and Monoid
for Style v
.