{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "width": 50,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/cars.json",
      "format": {"type": "json"},
      "transform": [
        {
          "type": "aggregate",
          "groupby": ["Origin"],
          "ops": ["mean"],
          "fields": ["Horsepower"],
          "as": ["mean_Horsepower"]
        }
      ]
    }
  ],
  "signals": [
    {"name": "y_step", "value": 20},
    {
      "name": "height",
      "update": "bandspace(domain('y').length, 1, 0.5) * y_step"
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "text",
      "style": ["text"],
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "fill": {"value": "black"},
          "description": {
            "signal": "\"Origin: \" + (isValid(datum[\"Origin\"]) ? datum[\"Origin\"] : \"\"+datum[\"Origin\"]) + \"; Mean of Horsepower: \" + (format(datum[\"mean_Horsepower\"], \".2f\"))"
          },
          "x": {"signal": "width", "mult": 0.5},
          "y": {"scale": "y", "field": "Origin"},
          "text": {"signal": "format(datum[\"mean_Horsepower\"], \".2f\")"},
          "align": {"value": "center"},
          "baseline": {"value": "middle"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "y",
      "type": "point",
      "domain": {"data": "source_0", "field": "Origin", "sort": true},
      "range": {"step": {"signal": "y_step"}},
      "padding": 0.5
    }
  ],
  "axes": [
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "Origin",
      "zindex": 0
    }
  ]
}