{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "height": 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": "impute",
          "field": "sum_people",
          "groupby": ["gender"],
          "key": "age",
          "method": "value",
          "value": 0
        },
        {
          "type": "stack",
          "groupby": ["age"],
          "field": "sum_people",
          "sort": {"field": ["gender"], "order": ["descending"]},
          "as": ["sum_people_start", "sum_people_end"],
          "offset": "zero"
        }
      ]
    }
  ],
  "signals": [
    {"name": "x_step", "value": 20},
    {
      "name": "width",
      "update": "bandspace(domain('x').length, 1, 0.5) * x_step"
    }
  ],
  "marks": [
    {
      "name": "layer_0_pathgroup",
      "type": "group",
      "from": {
        "facet": {
          "name": "faceted_path_layer_0_main",
          "data": "source_0",
          "groupby": ["gender"]
        }
      },
      "encode": {
        "update": {
          "width": {"field": {"group": "width"}},
          "height": {"field": {"group": "height"}}
        }
      },
      "marks": [
        {
          "name": "layer_0_marks",
          "type": "area",
          "style": ["area"],
          "sort": {"field": "datum[\"age\"]"},
          "from": {"data": "faceted_path_layer_0_main"},
          "encode": {
            "update": {
              "opacity": {"value": 0.7},
              "orient": {"value": "vertical"},
              "fill": {"scale": "color", "field": "gender"},
              "description": {
                "signal": "\"age: \" + (isValid(datum[\"age\"]) ? datum[\"age\"] : \"\"+datum[\"age\"]) + \"; Sum of people: \" + (format(datum[\"sum_people\"], \"\")) + \"; gender: \" + (isValid(datum[\"gender\"]) ? datum[\"gender\"] : \"\"+datum[\"gender\"])"
              },
              "x": {"scale": "x", "field": "age"},
              "y": {"scale": "y", "field": "sum_people_end"},
              "y2": {"scale": "y", "field": "sum_people_start"},
              "defined": {
                "signal": "isValid(datum[\"sum_people\"]) && isFinite(+datum[\"sum_people\"])"
              }
            }
          }
        }
      ]
    },
    {
      "name": "layer_1_pathgroup",
      "type": "group",
      "from": {
        "facet": {
          "name": "faceted_path_layer_1_main",
          "data": "source_0",
          "groupby": ["gender"]
        }
      },
      "encode": {
        "update": {
          "width": {"field": {"group": "width"}},
          "height": {"field": {"group": "height"}}
        }
      },
      "marks": [
        {
          "name": "layer_1_marks",
          "type": "line",
          "style": ["line"],
          "sort": {"field": "datum[\"age\"]"},
          "from": {"data": "faceted_path_layer_1_main"},
          "encode": {
            "update": {
              "stroke": {"scale": "color", "field": "gender"},
              "opacity": {"value": 0.7},
              "description": {
                "signal": "\"age: \" + (isValid(datum[\"age\"]) ? datum[\"age\"] : \"\"+datum[\"age\"]) + \"; Sum of people: \" + (format(datum[\"sum_people\"], \"\")) + \"; gender: \" + (isValid(datum[\"gender\"]) ? datum[\"gender\"] : \"\"+datum[\"gender\"])"
              },
              "x": {"scale": "x", "field": "age"},
              "y": {"scale": "y", "field": "sum_people_end"},
              "defined": {
                "signal": "isValid(datum[\"sum_people\"]) && isFinite(+datum[\"sum_people\"])"
              }
            }
          }
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "point",
      "domain": {"data": "source_0", "field": "age", "sort": true},
      "range": {"step": {"signal": "x_step"}},
      "padding": 0.5
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {
        "data": "source_0",
        "fields": ["sum_people_start", "sum_people_end"]
      },
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "source_0", "field": "gender", "sort": true},
      "range": ["#675193", "#ca8861"]
    }
  ],
  "axes": [
    {
      "scale": "y",
      "orient": "left",
      "gridScale": "x",
      "grid": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "age",
      "labelAlign": "right",
      "labelAngle": 270,
      "labelBaseline": "middle",
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "Sum of people",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ],
  "legends": [
    {
      "fill": "color",
      "symbolType": "circle",
      "title": "gender",
      "encode": {"symbols": {"update": {"opacity": {"value": 0.7}}}},
      "stroke": "color"
    }
  ]
}