{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "width": 200,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/cars.json",
      "format": {"type": "json"},
      "transform": [
        {
          "type": "aggregate",
          "groupby": ["Origin", "Cylinders"],
          "ops": ["count"],
          "fields": [null],
          "as": ["count_*"]
        },
        {
          "type": "stack",
          "groupby": [],
          "field": "count_*",
          "sort": {"field": ["Origin"], "order": ["ascending"]},
          "as": ["stack_count_Origin1", "stack_count_Origin2"],
          "offset": "normalize"
        },
        {
          "type": "joinaggregate",
          "as": ["x", "x2"],
          "ops": ["min", "max"],
          "fields": ["stack_count_Origin1", "stack_count_Origin2"],
          "groupby": ["Origin"]
        },
        {
          "type": "stack",
          "groupby": ["Origin"],
          "field": "count_*",
          "sort": {"field": ["Cylinders"], "order": ["ascending"]},
          "as": ["y", "y2"],
          "offset": "normalize"
        },
        {
          "type": "filter",
          "expr": "isValid(datum[\"x\"]) && isFinite(+datum[\"x\"]) && isValid(datum[\"y\"]) && isFinite(+datum[\"y\"]) && isValid(datum[\"Cylinders\"]) && isFinite(+datum[\"Cylinders\"])"
        }
      ]
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "rect",
      "style": ["rect"],
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "fill": {"scale": "color", "field": "Origin"},
          "opacity": {"scale": "opacity", "field": "Cylinders"},
          "tooltip": {
            "signal": "{\"Origin\": isValid(datum[\"Origin\"]) ? datum[\"Origin\"] : \"\"+datum[\"Origin\"], \"Cylinders\": format(datum[\"Cylinders\"], \"\")}"
          },
          "description": {
            "signal": "\"x: \" + (format(datum[\"x\"], \"\")) + \"; y: \" + (format(datum[\"y\"], \"\")) + \"; x2: \" + (format(datum[\"x2\"], \"\")) + \"; y2: \" + (format(datum[\"y2\"], \"\")) + \"; Origin: \" + (isValid(datum[\"Origin\"]) ? datum[\"Origin\"] : \"\"+datum[\"Origin\"]) + \"; Cylinders: \" + (format(datum[\"Cylinders\"], \"\"))"
          },
          "x": {"scale": "x", "field": "x"},
          "x2": {"scale": "x", "field": "x2"},
          "y": {"scale": "y", "field": "y"},
          "y2": {"scale": "y", "field": "y2"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "linear",
      "domain": {"data": "source_0", "fields": ["x", "x2"]},
      "range": [0, {"signal": "width"}],
      "nice": true,
      "zero": true
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {"data": "source_0", "fields": ["y", "y2"]},
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "source_0", "field": "Origin", "sort": true},
      "range": "category"
    },
    {
      "name": "opacity",
      "type": "linear",
      "domain": {"data": "source_0", "field": "Cylinders"},
      "range": [0.3, 0.8],
      "zero": false
    }
  ],
  "legends": [{"fill": "color", "symbolType": "square", "title": "Origin"}]
}