## Changelog for diagrams-core-1.2.0.4

## 1.2.0.4 (04 Dec 2014)

- Allow
`semigroups-0.16`

## 1.2.0.3 (17 November 2014)

- Allow
`lens-4.6`

## 1.2.0.2 (22 August 2014)

- Allow
`lens-4.4`

## 1.2.0.1 (4 June 2014)

- Bug fix:
`Measure`

values using mini-DSL (`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 mini-DSL for Measures.

New

`extent`

function, used in`diameter`

.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 from`diagrams-lib`

to`diagrams-core`

and generalized to work over any vector space.

**Dependency/version changes**- Allow
`semigroups-0.15`

- Allow
`lens-4.2`

- Allow
**API changes**Major refactoring which removes

`freeze`

(and hence`Split`

transforms, etc.) and adds units of`Measure`

.Refactoring and simplification of the

`Backend`

class.Remove

`Multibackend`

.Remove

`nullPrim`

,`IsPrim`

and simplify`RPrim`

so that it does not carry a transformation.Update

`adjustDia`

to return a transformation, not just a scale factor. Add`renderDiaT`

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 semigroups-0.14
```

## 1.1.0.2 (10 April 2014)

```
- Allow semigroups-0.13
```

## 1.1.0.1 (19 March 2014)

```
- Allow lens-4.1
```

## 1.1 (8 March 2014)

**New features**- New
`basis`

function - New
`determinant`

function for computing the determinant of a`Transformation`

- Add
`Typeable`

constraint on`Prim`

s, making it possible to extract things back out of a`Prim`

wrapper using`cast`

- Raw
`Trace`

s now return a*sorted list*of intersections, instead of only the smallest. This is used to implement a new family of functions`rayTraceV`

,`rayTraceP`

,`maxRayTraceV`

,`maxRayTraceP`

, which work similarly to the parallel versions without`Ray`

, but return the first intersection in the*positive*direction from the given point, rather than the smallest in absolute terms. - New
`Annotation`

type and corresponding`applyAnnotation`

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
`lens-4.0`

- Allow
`vector-space-points-0.2`

- 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 semigroups-0.12
```

## 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 d-annotation 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/diagrams-lib/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 non-linear function of the transformation applied to them).The only downside is that the u-annotation must be fixed ahead of time---doing otherwise requires a more general solution for constraint solving.

New function

`lookupName`

for doing a simple lookup of a named subdiagramNew module

`Diagrams.Core.Compile`

, containing a framework for compiling`QDiagrams`

into a simpler tree type`RTree`

, which may be used by backends for rendering.

**New instances**`Qualifiable`

instances for`(,)`

,`(,,)`

,`[]`

,`Set`

,`Map k`

, and`(->) e`

.`(->) e`

instance for`Juxtaposable`

(thanks to Carlos Scheidegger)

**API changes**Export

`pointDiagram`

function, which creates an otherwise empty diagram with a point (not empty) envelopeA bunch of stuff now uses machinery from the

`lens`

library.`envelope`

,`trace`

, and`subMap`

are now`Lens'`

es`Wrapped`

instances for`Trace`

,`TransInv`

,`QDiagram`

,`SubMap`

,`Envelope`

,`Style`

,`Query`

, and`Name`

(replaces`Newtype`

instances)`Iso`

s for`Query`

,`Envelope`

,`QDiagram`

,`SubMap`

,`TransInv`

## 0.7.0.1 (26 September 2013)

```
allow semigroups-0.11
```

## 0.7: 9 August 2013

**New features**- new function
`onBasis`

, to extract the matrix equivalent of a`Transformation`

`SubMap`

s are now`Deletable`

- new function
`localize`

for hiding/deleting names from scope - new
`IsPrim`

class, containing`transformWithFreeze`

function. This is primarily intended to support scale-invariant primitives (*e.g.*arrowheads) but may be useful for other stuff as well. The default implementation of`renderDia`

now uses`transformWithFreeze`

. - optimized
`Transformable`

instance for`TransInv`

- new function
**New instances**`Eq`

,`Ord`

,`Enveloped`

,`Traced`

, and`Qualifiable`

instances for`TransInv`

`Transformable`

instance for functions, which acts by conjugation

**API changes**`named`

and`namePoint`

have moved to the`diagrams-lib`

package.

**Dependency/version changes**- allow
`base-4.7`

- upgrade to
`monoid-extras-0.3`

- 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
`semigroups-0.9`

## 0.6: 11 December 2012

**New features**Proper support for subdiagrams: previous versions of diagrams-core 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 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.New functions

`envelope[VP]May`

`envelopeV`

and`envelopeP`

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 non-empty envelopes). The new functions have their return type wrapped in`Maybe`

for this purpose.New functions

`envelopeS`

and`envelopeSMay`

Like

`envelope[VP](May)`

, but returning a scalar multiple of the input vector.The

`Graphics.Rendering.Diagrams.Util`

module has been removed, along with the`withLength`

function. Calls to`withLength`

can be replaced using`withLength s v = s *^ normalized v`

Add needed constraints

`(InnerSpace v, OrderedField (Scalar v), Monoid' m)`

to the type of the`renderDias`

method in the`MultiBackend`

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
`base-4.6`

- allow
`containers-0.5.*`

- allow
`MemoTrie-0.6.1`

**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 that`mempty`

is now an identity element for`beside`

and friends.

## 0.5.0.1: 11 May 2012

- Update
`MemoTrie`

upper bound to allow`MemoTrie-0.5`

## 0.5: 9 March 2012

New features:

- New
`Juxtaposable`

class - New
`NullBackend`

and`D`

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 filled-in size)

- New
New instances:

`Enveloped`

,`HasOrigin`

,`Juxtaposable`

,`HasStyle`

, and`Transformable`

instances for`Set`

s and tuples`V Double = Double`

`Juxtaposable`

and`Boundable`

instances for`Map`

API changes

`AnnDiagram`

renamed to`QDiagram`

- #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 (`vector-space-points`

) - The
`Point`

constructor`P`

is no longer exported from`Graphics.Rendering.Diagrams`

. See the`Diagrams.TwoD.Types`

module from`diagrams-lib`

for new tools for working with abstract 2D points. If you really need the`P`

constructor, import`Graphics.Rendering.Diagrams.Points`

. - Name-related functions now return "located bounding functions" instead of pairs of points and bounds, to allow for future expansion.

Dependency/version changes:

`vector-space`

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