diagrams-core

Core libraries for diagrams EDSL

http://projects.haskell.org/diagrams

Version on this page:1.4.2@rev:1
LTS Haskell 24.16:1.5.1.1@rev:4
Stackage Nightly 2025-10-24:1.5.1.1@rev:4
Latest on Hackage:1.5.1.1@rev:4

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BSD-3-Clause licensed by Brent Yorgey
Maintained by [email protected]
This version can be pinned in stack with:diagrams-core-1.4.2@sha256:47de45658e8a805b7cb7f535e7b093daf7e861604fa3c70e25bd4ef481bf1571,2997

Module documentation for 1.4.2

Build Status

The core modules defining the basic data structures and algorithms for diagrams, a Haskell embedded domain-specific language for compositional, declarative drawing.

Changes

v1.4.2 (2019-10-19)

  • New KeyVal constructor for Annotation (PR)
  • Updates for GHC 8.8
  • Drop support for GHC 7.6 and 7.8

v1.4.1.1 (2018-06-17)

  • Add some ConstraintKinds pragmas to allow compilation on GHC 7.8 and 7.6

v1.4.1 (2018-04-10)

  • Allow base-4.11
  • Allow lens-4.16
  • Add Semigroup instance to build on GHC 8.4

v1.4.0.1

  • Allow base-4.10

v1.4 (2016-10-26)

  • New features

    • New eachName traversal, for traversing over parts of a Name that match a given type

    • More documentation explaining HasOrigin and Transformable instances for Envelope

  • Dependency/version changes

    • Allow lens-4.15
    • Many other upper bounds bumped; see minor release changelogs below.

  • New instances

    • Transformable instance for Measured

    • A bunch more instances for Query (Distributive, Representable, Profunctor, Coseive, Closed, Costrong, Corepresentable)

  • API changes

    • Move some Query-related functions to diagrams-lib (sample, value, resetValue, clearValue)

    • Remove some redundant constraints in type signatures (should not actually affect API)

v1.3.0.8 (2016-06-05)

  • allow base-4.9
  • build warning-free on GHC 8.0.1

v1.3.0.7 (2016-05-01)

  • allow lens-4.14

Full Changelog

v1.3.0.6 (2016-02-19)

  • allow unordered-containers-0.2.*

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v1.3.0.5 (2016-01-14)

  • allow unordered-containers-0.2.6

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v1.3.0.4 (2015-11-10)

  • allow semigroups-0.18

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v1.3.0.3 (2015-09-17)

  • allow lens-4.13
  • allow linear-1.20
  • allow semigroups-0.17

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v1.3.0.2 (2015-07-19)

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v1.3.0.1 (2015-05-26)

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v1.3 (2015-04-19)

  • New features

    • Update for ghc-7.10.

    • Switch from vector-space to linear for linear algebra.

    • OpacityGroup annotation for setting the opacity of diagrams as a group. Opacity groups can be applied with the opacityGroup or groupOpacity functions.

    • Added atAttr, atMAttr and atTAttr lenses onto the attributes of styles.

    • InSpace and SameSpace synonyms.

    • size function for computing the range of an enveloped object in the basis vectors.

    • “Grouping” for transparent things #21

  • Dependency/version changes

    • Allow base-4.8
    • Allow lens-4.9

  • New instances

    • Show instances for Attribute and Style.
    • Each, Ixed and At instances for and Style.

  • API changes

    • Measure has a new internal representation. Local, Global, Normalized, and Output have been renamed to local, global, normalized and output respectivly. Measure is now defined in Diagrams.Core.Measure.

    • GTAttribute has been removed. MAttribute now holds measured attributes and no longer requires a Data instance.

    • V is now a * -> * kind type family.

    • New type family N for the number type of an object, Scalar type family no longer exists.

    • (|>) has moved to (.>>) to make room for lens’s snoc operator.

    • Style’s internal representation now uses a hashmap of the TypeRep.

Merged pull requests:

v1.2.0.6 (2015-04-03)

Full Changelog

Closed issues:

  • Please add support for recent versions of vector-space #78

v1.2.0.5 (2015-01-13)

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v1.2.0.4 (2014-12-04)

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v1.2.0.3 (2014-11-17)

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v1.2.0.2 (2014-08-22)

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Closed issues:

  • Warn against GND for IsName #67

v1.2.0.1 (2014-06-04)

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Merged pull requests:

  • Propogate transformations into the terms of Measure #66 (bergey)

v1.2 (2014-06-02)

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  • 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

  • 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).

Implemented enhancements:

  • Extracting things from Prim wrappers #42

Closed issues:

  • Incomplete comment on Backend class #64

  • Please add support for Lens 4.x #56

Merged pull requests:

v1.1 (2014-03-09)

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  • New features

    • New basis function
    • New determinant function for computing the determinant of a Transformation
    • Add Typeable constraint on Prims, making it possible to extract things back out of a Prim wrapper using cast
    • Raw Traces 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.

  • Dependency/version changes

    • Require lens-4.0
    • Allow vector-space-points-0.2

  • Bug fixes

    • Looking up a subdiagram by name now results in a diagram which still has that name (#43)

Closed issues:

  • Named subdiagrams lose their names after being looked up #43

Merged pull requests:

v1.0.0.1 (2013-11-28)

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v1.0 (2013-11-25)

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  • 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 subdiagram

    • New 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) envelope

    • A 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)
      • Isos for Query, Envelope, QDiagram, SubMap, TransInv

Implemented enhancements:

  • Tree structure in Backends #19

Merged pull requests:

v0.7.0.1 (2013-09-27)

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Merged pull requests:

v0.7 (2013-08-09)

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  • New features

    • new function onBasis, to extract the matrix equivalent of a Transformation
    • SubMaps 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 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

Implemented enhancements:

  • Function to extract matrix coefficients from a Transformation #22

Closed issues:

  • Support for monoid-extras-0.3.0.0 #38

Merged pull requests:

  • New IsPrim class for supporting ScaleInv #37 (byorgey)

  • onBasis gets the matrix equivalent of the Transformation #36 (bergey)

v0.6.0.2 (2013-03-06)

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Fixed bugs:

  • radius is wrong #35

Merged pull requests:

  • make SubMaps deletable, and add a new function ‘localize’ for hiding/deleting names #34 (byorgey)

v0.6.0.1 (2013-01-07)

Full Changelog

Fixed bugs:

  • “type instance V (Point v) = v” is not visible without explicit import. #17

Merged pull requests:

  • Transformable instance for functions (by conjugation) #32 (conal)

v0.6 (2012-12-12)

Full Changelog

  • 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 tuples

      Previously, 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

  • 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.

Implemented enhancements:

  • Turn R2 into D2 (Generalize R2 to any numeric type) #20

  • Terminology: rename “bounding function” -> “envelope”; “boundary function” -> “boundary” #16

  • Refactor: rename AnnDiagram to QDiagram #15

  • Combine (point, bounds) pairs stored in NameMap into a single “located bounding function” data structure #14

  • Remember more structure when building diagrams #12

  • Diagram-building service library + executable #7

Fixed bugs:

  • setBounds is incorrect – throws away bounds of subsequent diagrams too #13

  • Start developing test suites #10

  • Freezing does not appear to work with the SVG backend #9

  • Silent failure on other image types than .png #6

  • Tutorial contains links to old version of package #5

  • space is not left for empty diagram when using e.g. hcat’ with {sep = … } #3

  • Ellipse rotated incorrectly in test file with ellipse next to a square #2

Closed issues:

  • Rename core modules to remove Graphics.Rendering prefix. #28

  • Improve haddock documentation #11

  • Improve description of Envelope in Haddock documentation #1

Merged pull requests:

  • Add envelopeS / envelopeSMay for querying scalar displacements from envelopes #31 (mgsloan)

  • Better definition for diameter #30 (mgsloan)

  • Added needed constraints for MultiBackend. #29 (fryguybob)

  • Rename names to subMap, and add new function names #26 (byorgey)

  • Fixes to work with rewritten dual-tree #25 (byorgey)

  • Fix for juxtaposeDefault to correctly handle empty envelopes #24 (byorgey)

  • dep bumps - fixes for GHC7.6 #23 (mgsloan)

v0.5 (2012-03-09)

  • 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 instances:

    • Enveloped, HasOrigin, Juxtaposable, HasStyle, and Transformable instances for Sets 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

* This Change Log was automatically generated by (and hand edited) github_changelog_generator