MediaWiki Limn

Limn is a MediaWiki extension that uses Vega JS to visualize almost arbitrary data in almost arbitrary ways.

Requirements

• JsonConfig extension ≥1.24.

Installation

If you already have installed mediawiki and JsonConfig extension, just add the lines below to your LocalSettings.php. Otherwise follow the installation instructions.

require_once("$IP/extensions/JsonConfig/JsonConfig.php");
require_once("$IP/extensions/Limn/Limn.php");

Then check it's active in Special:Version.

Configuration

// To use limn as a tag element in wiki markup, enable it with:
// e.g.: <limn>{...}</limn>
$wgEnableLimnParserTag = true;

// To use it on a standalone page, enable it via $wgJsonConfigs
// https://www.mediawiki.org/wiki/Extension:JsonConfig
$wgJsonConfigModels['limn.jsonconfig'] = 'limn\Content';
$wgJsonConfigs['limn.jsonconfig'] = array(
	'namespace' => <PICK-A-NS-NUMBER>,
	'nsName' => 'Limn',
	'isLocal' => true,
);

Usage

Create a new page in the Limn namespace and paste the following (nothing else) save… and voilà!

{
  "width": 400,
  "height": 200,
  "padding": {"top": 10, "left": 30, "bottom": 20, "right": 10},
  "data": [
    {
      "name": "table",
      "values": [
        {"x":"A", "y":28}, {"x":"B", "y":55}, {"x":"C", "y":43},
        {"x":"D", "y":91}, {"x":"E", "y":81}, {"x":"F", "y":53},
        {"x":"G", "y":19}, {"x":"H", "y":87}, {"x":"I", "y":52}
      ]
    }
  ],
  "scales": [
    {"name":"x", "type":"ordinal", "range":"width", "domain":{"data":"table", "field":"data.x"}},
    {"name":"y", "range":"height", "nice":true, "domain":{"data":"table", "field":"data.y"}}
  ],
  "axes": [
    {"type":"x", "scale":"x"},
    {"type":"y", "scale":"y"}
  ],
  "marks": [
    {
      "type": "rect",
      "from": {"data":"table"},
      "properties": {
        "enter": {
          "x": {"scale":"x", "field":"data.x"},
          "width": {"scale":"x", "band":true, "offset":-1},
          "y": {"scale":"y", "field":"data.y"},
          "y2": {"scale":"y", "value":0}
        },
        "update": { "fill": {"value":"steelblue"} },
        "hover": { "fill": {"value":"red"} }
      }
    }
  ]
}

Should result in:

History

• Zurich Hackathon, project started ;
• London Wikimania/Hackathon: continue.