{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Line chart with a dashed part created by drawing multiple connecting lines. Note that the data source contains the data point at (E, 81) twice.",
  "background": "white",
  "padding": 5,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "values": [
        {"a": "A", "b": 28, "predicted": false},
        {"a": "B", "b": 55, "predicted": false},
        {"a": "D", "b": 91, "predicted": false},
        {"a": "E", "b": 81, "predicted": false},
        {"a": "E", "b": 81, "predicted": true},
        {"a": "G", "b": 19, "predicted": true},
        {"a": "H", "b": 87, "predicted": true}
      ]
    }
  ],
  "signals": [
    {"name": "x_step", "value": 20},
    {
      "name": "width",
      "update": "bandspace(domain('x').length, 1, 0.5) * x_step"
    }
  ],
  "marks": [
    {
      "name": "pathgroup",
      "type": "group",
      "from": {
        "facet": {
          "name": "faceted_path_main",
          "data": "source_0",
          "groupby": ["predicted"]
        }
      },
      "encode": {
        "update": {
          "width": {"field": {"group": "width"}},
          "height": {"field": {"group": "height"}}
        }
      },
      "marks": [
        {
          "name": "marks",
          "type": "line",
          "style": ["line"],
          "sort": {"field": "datum[\"a\"]"},
          "from": {"data": "faceted_path_main"},
          "encode": {
            "update": {
              "stroke": {"value": "#4c78a8"},
              "strokeDash": {"scale": "strokeDash", "field": "predicted"},
              "description": {
                "signal": "\"a: \" + (isValid(datum[\"a\"]) ? datum[\"a\"] : \"\"+datum[\"a\"]) + \"; b: \" + (format(datum[\"b\"], \"\")) + \"; predicted: \" + (isValid(datum[\"predicted\"]) ? datum[\"predicted\"] : \"\"+datum[\"predicted\"])"
              },
              "x": {"scale": "x", "field": "a"},
              "y": {"scale": "y", "field": "b"},
              "defined": {
                "signal": "isValid(datum[\"b\"]) && isFinite(+datum[\"b\"])"
              }
            }
          }
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "point",
      "domain": {"data": "source_0", "field": "a", "sort": true},
      "range": {"step": {"signal": "x_step"}},
      "padding": 0.5
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {"data": "source_0", "field": "b"},
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    },
    {
      "name": "strokeDash",
      "type": "ordinal",
      "domain": {"data": "source_0", "field": "predicted", "sort": true},
      "range": [[1, 0], [4, 2], [2, 1], [1, 1], [1, 2, 4, 2]]
    }
  ],
  "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": "a",
      "labelAlign": "right",
      "labelAngle": 270,
      "labelBaseline": "middle",
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "b",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ],
  "legends": [
    {
      "strokeDash": "strokeDash",
      "symbolType": "stroke",
      "title": "predicted",
      "encode": {"symbols": {"update": {"stroke": {"value": "#4c78a8"}}}}
    }
  ]
}