Isotype Bar Chart with Emoji

This example was inspired by @jakevdp and Isotype Bar Chart by @jwoLondon

View this example in the online editor

Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v3.json",
  "config": {"view": {"stroke": ""}},
  "width": 800,
  "height": 200,
  "data": {
    "values": [
      {"country": "Great Britain", "animal": "pigs"},
      {"country": "Great Britain", "animal": "pigs"},
      {"country": "Great Britain", "animal": "cattle"},
      {"country": "Great Britain", "animal": "cattle"},
      {"country": "Great Britain", "animal": "cattle"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "Great Britain", "animal": "sheep"},
      {"country": "United States", "animal": "pigs"},
      {"country": "United States", "animal": "pigs"},
      {"country": "United States", "animal": "pigs"},
      {"country": "United States", "animal": "pigs"},
      {"country": "United States", "animal": "pigs"},
      {"country": "United States", "animal": "pigs"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "cattle"},
      {"country": "United States", "animal": "sheep"},
      {"country": "United States", "animal": "sheep"},
      {"country": "United States", "animal": "sheep"},
      {"country": "United States", "animal": "sheep"},
      {"country": "United States", "animal": "sheep"},
      {"country": "United States", "animal": "sheep"},
      {"country": "United States", "animal": "sheep"}
    ]
  },
  "transform": [
    {
      "calculate": "{'cattle': '🐄', 'pigs': '🐖', 'sheep': '🐏'}[datum.animal]",
      "as": "emoji"
    },
    {"window": [{"op": "rank", "as": "rank"}], "groupby": ["country", "animal"]}
  ],
  "mark": {"type": "text", "baseline": "middle"},
  "encoding": {
    "x": {"field": "rank", "type": "ordinal", "axis": null},
    "y": {"field": "animal", "type": "nominal", "axis": null, "sort": null},
    "row": {"field": "country", "type": "nominal", "header": {"title": ""}},
    "text": {"field": "emoji", "type": "nominal"},
    "size": {"value": 65}
  }
}