{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "width": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/population.json",
      "format": {"type": "json"},
      "transform": [
        {"type": "filter", "expr": "datum.year == 2000"},
        {
          "type": "formula",
          "expr": "datum.sex == 2 ? 'Female' : 'Male'",
          "as": "gender"
        },
        {
          "type": "aggregate",
          "groupby": ["age", "gender"],
          "ops": ["sum"],
          "fields": ["people"],
          "as": ["sum_people"]
        },
        {
          "type": "stack",
          "groupby": ["age"],
          "field": "sum_people",
          "sort": {"field": ["gender"], "order": ["ascending"]},
          "as": ["sum_people_start", "sum_people_end"],
          "offset": "normalize"
        }
      ]
    },
    {
      "name": "data_0",
      "source": "source_0",
      "transform": [
        {
          "type": "filter",
          "expr": "isValid(datum[\"sum_people\"]) && isFinite(+datum[\"sum_people\"])"
        }
      ]
    },
    {
      "name": "data_1",
      "source": "source_0",
      "transform": [
        {
          "type": "filter",
          "expr": "isValid(datum[\"sum_people\"]) && isFinite(+datum[\"sum_people\"])"
        }
      ]
    }
  ],
  "signals": [
    {"name": "y_step", "value": 17},
    {
      "name": "height",
      "update": "bandspace(domain('y').length, 0.1, 0.05) * y_step"
    }
  ],
  "marks": [
    {
      "name": "layer_0_marks",
      "type": "rect",
      "style": ["bar"],
      "from": {"data": "data_1"},
      "encode": {
        "update": {
          "fill": {"scale": "color", "field": "gender"},
          "ariaRoleDescription": {"value": "bar"},
          "description": {
            "signal": "\"population: \" + (format(datum[\"sum_people_end\"]-datum[\"sum_people_start\"], \"\")) + \"; age: \" + (isValid(datum[\"age\"]) ? datum[\"age\"] : \"\"+datum[\"age\"]) + \"; gender: \" + (isValid(datum[\"gender\"]) ? datum[\"gender\"] : \"\"+datum[\"gender\"])"
          },
          "x": {"scale": "x", "field": "sum_people_end"},
          "x2": {"scale": "x", "field": "sum_people_start"},
          "y": {"scale": "y", "field": "age"},
          "height": {"scale": "y", "band": 1}
        }
      }
    },
    {
      "name": "layer_1_marks",
      "type": "text",
      "style": ["text"],
      "from": {"data": "data_0"},
      "encode": {
        "update": {
          "opacity": {"value": 0.9},
          "fill": {"value": "white"},
          "description": {
            "signal": "\"population: \" + (format(datum[\"sum_people_end\"]-datum[\"sum_people_start\"], \"\")) + \"; age: \" + (isValid(datum[\"age\"]) ? datum[\"age\"] : \"\"+datum[\"age\"]) + \"; gender: \" + (isValid(datum[\"gender\"]) ? datum[\"gender\"] : \"\"+datum[\"gender\"])"
          },
          "x": {
            "signal": "scale(\"x\", 0.5 * datum[\"sum_people_start\"] + 0.5 * datum[\"sum_people_end\"])"
          },
          "y": {"scale": "y", "field": "age", "band": 0.5},
          "text": {"signal": "format(datum[\"sum_people\"], \"\")"},
          "align": {"value": "center"},
          "baseline": {"value": "middle"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "linear",
      "domain": [0, 1],
      "range": [0, {"signal": "width"}],
      "nice": true,
      "zero": true
    },
    {
      "name": "y",
      "type": "band",
      "domain": {
        "fields": [
          {"data": "data_1", "field": "age"},
          {"data": "data_0", "field": "age"}
        ],
        "sort": true
      },
      "range": {"step": {"signal": "y_step"}},
      "paddingInner": 0.1,
      "paddingOuter": 0.05
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "data_1", "field": "gender", "sort": true},
      "range": ["#675193", "#ca8861"]
    }
  ],
  "axes": [
    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "population",
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "zindex": 0
    },
    {"scale": "y", "orient": "left", "grid": false, "title": "age", "zindex": 0}
  ],
  "legends": [{"fill": "color", "symbolType": "square", "title": "gender"}]
}