hvega: Create Vega and Vega-Lite visualizations.

[ bsd3, graphics, library ] [ Propose Tags ]

This is an almost-direct port of elm-vega (http://package.elm-lang.org/packages/gicentre/elm-vega/2.2.1) to Haskell.

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Versions [faq],,
Change log CHANGELOG.md
Dependencies aeson (>=0.11 && <1.5), base (>=4.7 && <5), text (==1.2.*), vector (>=0.11 && <0.13) [details]
License BSD-3-Clause
Copyright 2018 Douglas Burke
Author Douglas Burke
Maintainer dburke.gw@gmail.com
Category Graphics
Home page https://github.com/DougBurke/hvega
Bug tracker https://github.com/DougBurke/hvega/issues
Source repo head: git clone https://github.com/DougBurke/hvega
Uploaded by DouglasBurke at Sat Aug 4 17:00:17 UTC 2018
Distributions LTSHaskell:, NixOS:, Stackage:
Downloads 318 total (71 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2018-08-04 [all 1 reports]


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Readme for hvega-

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Support the creation of Vega-Lite visualizations in Haskell. This code is released under the BSD3 license.

It is an almost-direct copy of version 2.2.1 of the Elm Vega library, which is released under a BSD3 license by Jo Wood of the giCentre at the City University of London.


let cars =  dataFromUrl "https://vega.github.io/vega-datasets/data/cars.json" []

    enc = encoding
            . position X [ PName "Horsepower", PmType Quantitative ]
            . position Y [ PName "Miles_per_Gallon", PmType Quantitative ]
            . color [ MName "Origin", MmType Nominal ]

    bkg = background "rgba(0, 0, 0, 0.05)"

in toVegaLite [ bkg, cars, mark Circle [], enc [] ]

When viewed with a Vega-Lite aware viewer, the resultant plot is

Simple scatterplot


The Elm Vega documentation can be used as a guide to using this module. The Vega-Lite Example Gallery has been converted to an IHaskell notebook (unfortunately the plots created by VegaEmbed do not appear in the notebook when viewed with either GitHub's viewer or ipynb viewer).

Differences to Elm Vega

The main changes to version 2.2.1 of Elm Vega are:

  • Replace Spec by VLSpec (although both are synonyms for the underlying JSON representation).

  • Add a type for the output of toVegaLite (VegaLite) that is separate from VLSpec, which is usefull for integration with IHaskell. The JSON specification is retrieved with fromVL.

  • Take advantage of the lack of backwards compatibality requirements to remove or replace several symbols (such as add the Utc constructor to TimeUnit, remove the bin function, and use Data rather than (VLProperty, VLSpec) in function signatures).