Changelog for diagramscore1.2.0.2
1.2.0.2 (22 August 2014)
 Allow lens4.4
1.2.0.1 (4 June 2014)
 Bug fix:
Measure
values using miniDSL (atLeast
,atMost
, etc.) are now properly transformed
1.2 (27 May 2014)

New features

New function
matrixHomRep
to convert a transformation to a homogeneous matrix representation. 
New function
dropTransl
to drop the translation component from a transformation. 
A miniDSL for Measures.

New
extent
function, used indiameter
. 
New
dimension
function to return the dimension of a vector space. 
New
_relative
iso between points and vectors. 
avgScale
function (for computing the average scaling factor of a transformation) has been moved fromdiagramslib
todiagramscore
and generalized to work over any vector space.


Dependency/version changes
 Allow
semigroups0.15
 Allow
lens4.2
 Allow

API changes

Major refactoring which removes
freeze
(and henceSplit
transforms, etc.) and adds units ofMeasure
. 
Refactoring and simplification of the
Backend
class. 
Remove
Multibackend
. 
Remove
nullPrim
,IsPrim
and simplifyRPrim
so that it does not carry a transformation. 
Update
adjustDia
to return a transformation, not just a scale factor. AddrenderDiaT
which returns a transformation (for use by end users, e.g. to convert output coordinates back into local coordinates).

1.1.0.3 (15 May 2014)
 Allow semigroups0.14
1.1.0.2 (10 April 2014)
 Allow semigroups0.13
1.1.0.1 (19 March 2014)
 Allow lens4.1
1.1 (8 March 2014)

New features
 New
basis
function  New
determinant
function for computing the determinant of aTransformation
 Add
Typeable
constraint onPrim
s, making it possible to extract things back out of aPrim
wrapper usingcast
 Raw
Trace
s now return a sorted list of intersections, instead of only the smallest. This is used to implement a new family of functionsrayTraceV
,rayTraceP
,maxRayTraceV
,maxRayTraceP
, which work similarly to the parallel versions withoutRay
, but return the first intersection in the positive direction from the given point, rather than the smallest in absolute terms.  New
Annotation
type and correspondingapplyAnnotation
function, for attaching uninterpreted annotations at specific points in a diagram tree. Currently this is used for hyperlinks; more annotation types will be added in the future.
 New

Dependency/version changes
 Require
lens4.0
 Allow
vectorspacepoints0.2
 Require

Bug fixes
 Looking up a subdiagram by name now results in a diagram which still has that name (#43)
1.0.0.1 (27 November 2013)
 Allow semigroups0.12
1.0 (25 November 2013)

New features

Delayed subtrees: instead of a primitive, one can now also have a delayed subtree at a leaf, containing a continuation which generates a
QDiagram
when given the accumulated dannotation at that point in the tree. Useful for things which need to know the final transformation applied to them before deciding what diagram to generate. The prototypical use case is arrows: see https://github.com/diagrams/diagramslib/issues/112 . However, this may be useful for other things as well: for example, diagrams which scale normally until hitting some maximum or minimum size, at which point they refuse to scale any further (or more generally diagrams which scale as some nonlinear function of the transformation applied to them).The only downside is that the uannotation must be fixed ahead of timedoing otherwise requires a more general solution for constraint solving.

New function
lookupName
for doing a simple lookup of a named subdiagram 
New module
Diagrams.Core.Compile
, containing a framework for compilingQDiagrams
into a simpler tree typeRTree
, which may be used by backends for rendering.


New instances

Qualifiable
instances for(,)
,(,,)
,[]
,Set
,Map k
, and(>) e
. 
(>) e
instance forJuxtaposable
(thanks to Carlos Scheidegger)


API changes

Export
pointDiagram
function, which creates an otherwise empty diagram with a point (not empty) envelope 
A bunch of stuff now uses machinery from the
lens
library.envelope
,trace
, andsubMap
are nowLens'
esWrapped
instances forTrace
,TransInv
,QDiagram
,SubMap
,Envelope
,Style
,Query
, andName
(replacesNewtype
instances)Iso
s forQuery
,Envelope
,QDiagram
,SubMap
,TransInv

0.7.0.1 (26 September 2013)
allow semigroups0.11
0.7: 9 August 2013

New features
 new function
onBasis
, to extract the matrix equivalent of aTransformation
SubMap
s are nowDeletable
 new function
localize
for hiding/deleting names from scope  new
IsPrim
class, containingtransformWithFreeze
function. This is primarily intended to support scaleinvariant primitives (e.g. arrowheads) but may be useful for other stuff as well. The default implementation ofrenderDia
now usestransformWithFreeze
.  optimized
Transformable
instance forTransInv
 new function

New instances

Eq
,Ord
,Enveloped
,Traced
, andQualifiable
instances forTransInv

Transformable
instance for functions, which acts by conjugation


API changes
named
andnamePoint
have moved to thediagramslib
package.

Dependency/version changes
 allow
base4.7
 upgrade to
monoidextras0.3
 allow
0.6.0.2: 5 March 2013
 bug fix: the 'diameter' and 'radius' functions now work correctly.
0.6.0.1: 7 January 2013
 allow
semigroups0.9
0.6: 11 December 2012

New features

Proper support for subdiagrams: previous versions of diagramscore had a mechanism for associating names with a pair of a location and an envelope. Now, names are associated with actual subdiagrams (including their location and envelope, along with all the other information stored by a diagram).
See
Diagrams.Core.Types
. 
Traces: in addition to an envelope, each diagram now stores a "trace", which is like an embedded raytracer: given any ray (represented by a base point and a vector), the trace computes the closest point of intersection with the diagram along the ray. This is useful for determining points on the boundary of a diagram, e.g. when drawing arrows between diagrams.
See
Diagrams.Core.Trace
.


API changes

The modules have all been renamed to be more consistent with the module naming scheme in the rest of the diagrams universe. In particular:
Graphics.Rendering.Diagrams
>Diagrams.Core
Grahpics.Rendering.Diagrams.Core
>Diagrams.Core.Types
Graphics.Rendering.Diagrams.*
>Diagrams.Core.*

Graphics.Rendering.Diagrams.UDTree
has been split out into a separatedualtree
package (which has also been substantially rewritten). 
Graphics.Rendering.Diagrams.{Monoids,MList}
have been split out into a separatemonoidextras
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 aString
usingshow
. 
The new
subMap
function fills a similar role thatnames
used to play, returning the entire mapping from names to subdiagrams. 
New functions
envelope[VP]May
envelopeV
andenvelopeP
return the zero vector and origin, respectively, when called on an empty envelope. However, sometimes it's useful to actually know whether the envelope was empty or not (the zero vector and the origin are legitimate outputs from nonempty envelopes). The new functions have their return type wrapped inMaybe
for this purpose. 
New functions
envelopeS
andenvelopeSMay
Like
envelope[VP](May)
, but returning a scalar multiple of the input vector. 
The
Graphics.Rendering.Diagrams.Util
module has been removed, along with thewithLength
function. Calls towithLength
can be replaced usingwithLength s v = s *^ normalized v

Add needed constraints
(InnerSpace v, OrderedField (Scalar v), Monoid' m)
to the type of therenderDias
method in theMultiBackend
class. 
Generalized
Transformable
instances for pairs and tuplesPreviously, the components of the tuples were required to have the same type; but everything still works as long as they all share the same vector space. This is actually useful in practice: say, if we wanted to pair a diagram with a path and then apply the same transformation to both.


Improvements
 More efficient implementation of
diameter
 More efficient implementation of

Dependency/version changes
 Tested with GHC 7.6.1
 allow
base4.6
 allow
containers0.5.*
 allow
MemoTrie0.6.1

Bug fixes

juxtaposeDefault now correctly handles empty envelopes (#37)
juxtaposeDefault
is now the identity on the second object if either one has an empty envelope. In particular this means thatmempty
is now an identity element forbeside
and friends.

0.5.0.1: 11 May 2012
 Update
MemoTrie
upper bound to allowMemoTrie0.5
0.5: 9 March 2012

New features:
 New
Juxtaposable
class  New
NullBackend
andD
types, for conveniently giving a monomorphic type to diagrams when we don't care which one it is.  #27: Change type of
adjustDia
to return a new options record (with an explicitly filledin size)
 New

New instances:
Enveloped
,HasOrigin
,Juxtaposable
,HasStyle
, andTransformable
instances forSet
s and tuplesV Double = Double
Juxtaposable
andBoundable
instances forMap

API changes
AnnDiagram
renamed toQDiagram
 #61: terminology change from "bounds" to "envelope"
boundary
>envelopeP
 "bounding region" > "envelope"
Bounds
>Envelope
Boundable
>Enveloped
getBounds
>getEnvelope
 etc.
 Split out definition of
Point
into separate package (vectorspacepoints
)  The
Point
constructorP
is no longer exported fromGraphics.Rendering.Diagrams
. See theDiagrams.TwoD.Types
module fromdiagramslib
for new tools for working with abstract 2D points. If you really need theP
constructor, importGraphics.Rendering.Diagrams.Points
.  Namerelated functions now return "located bounding functions" instead of pairs of points and bounds, to allow for future expansion.

Dependency/version changes:
vectorspace
0.8 is now required. Bump base upper bound to allow 4.5; now tested with GHC 7.4.1.

Bug fixes:
 Bug fix related to empty envelopes
0.4: 23 October 2011
 improved documentation
 a few new instances (Newtype Point, Boundable Point)
 new functions (value, clearValue, resetValue) for working with alternate query monoids
0.3: 18 June 2011
 big overhaul of name maps:
 allow arbitrary types as atomic names
 carry along bounding functions as well as names in NameMaps
 additional functions for querying information associated with names
 fix for issue #34 (fix behavior of setBounds)
 Transformable and HasOrigin instances for Transformations
0.2: 3 June 2011
 bounding regions can now be overridden
 new namePoint function for more flexibly assigning names to arbitrary points
 add HasStyle, Boundable, and HasOrigin instances for lists
 add a "trivial backend"
 transformable attributes
0.1.1: 18 May 2011
 link to new website
0.1: 17 May 2011
 initial preview release