{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Average Stock prices of 5 Tech Companies.",
  "background": "white",
  "padding": 5,
  "width": 20,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/stocks.csv",
      "format": {"type": "csv"},
      "transform": [
        {
          "type": "aggregate",
          "groupby": ["symbol"],
          "ops": ["mean"],
          "fields": ["price"],
          "as": ["mean_price"]
        },
        {
          "type": "filter",
          "expr": "isValid(datum[\"mean_price\"]) && isFinite(+datum[\"mean_price\"])"
        }
      ]
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "rule",
      "style": ["rule"],
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "stroke": {"scale": "color", "field": "symbol"},
          "description": {
            "signal": "\"Mean of price: \" + (format(datum[\"mean_price\"], \"\")) + \"; symbol: \" + (isValid(datum[\"symbol\"]) ? datum[\"symbol\"] : \"\"+datum[\"symbol\"])"
          },
          "x": {"field": {"group": "width"}},
          "x2": {"value": 0},
          "y": {"scale": "y", "field": "mean_price"},
          "strokeWidth": {"value": 2}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "y",
      "type": "linear",
      "domain": {"data": "source_0", "field": "mean_price"},
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "source_0", "field": "symbol", "sort": true},
      "range": "category"
    }
  ],
  "axes": [
    {
      "scale": "y",
      "orient": "left",
      "grid": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "Mean of price",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ],
  "legends": [{"stroke": "color", "symbolType": "stroke", "title": "symbol"}]
}