{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Temperature normals in Seattle. Derived from [Seattle Annual Temperate](https://vega.github.io/vega/examples/annual-temperature/) example from the Vega example gallery.",
  "background": "white",
  "padding": 5,
  "title": {"text": "Seattle Temperature Normals", "anchor": "start"},
  "data": [
    {
      "name": "source_0",
      "url": "data/seattle-weather-hourly-normals.csv",
      "format": {"type": "csv", "parse": {"date": "date"}},
      "transform": [
        {
          "type": "formula",
          "expr": "(hours(datum.date) + 18) % 24",
          "as": "order"
        },
        {
          "field": "date",
          "type": "timeunit",
          "units": ["hours"],
          "as": ["hours_date", "hours_date_end"]
        },
        {
          "field": "date",
          "type": "timeunit",
          "units": ["month", "date"],
          "as": ["monthdate_date", "monthdate_date_end"]
        },
        {
          "type": "aggregate",
          "groupby": ["monthdate_date", "hours_date"],
          "ops": ["mean"],
          "fields": ["temperature"],
          "as": ["mean_temperature"]
        }
      ]
    },
    {
      "name": "row_domain",
      "source": "source_0",
      "transform": [
        {
          "type": "aggregate",
          "groupby": ["hours_date"],
          "fields": ["order"],
          "ops": ["min"],
          "as": ["order"]
        }
      ]
    }
  ],
  "signals": [
    {"name": "child_width", "value": 800},
    {"name": "child_height", "value": 25}
  ],
  "layout": {
    "padding": {"row": 1, "column": 20},
    "offset": {"rowTitle": 10},
    "columns": 1,
    "bounds": "full",
    "align": "all"
  },
  "marks": [
    {
      "name": "row-title",
      "type": "group",
      "role": "row-title",
      "title": {
        "text": "date (hours)",
        "orient": "left",
        "style": "guide-title",
        "offset": -4
      }
    },
    {
      "name": "row_header",
      "type": "group",
      "role": "row-header",
      "from": {"data": "row_domain"},
      "sort": {"field": "datum[\"order\"]", "order": "ascending"},
      "title": {
        "text": {
          "signal": "hours(parent[\"hours_date\"]) == 0 ? 'Midnight' : hours(parent[\"hours_date\"]) == 12 ? 'Noon' : timeFormat(parent[\"hours_date\"], '%I:%M %p')"
        },
        "orient": "left",
        "style": "guide-label",
        "frame": "group",
        "baseline": "middle",
        "align": "left",
        "angle": 0,
        "offset": 2
      },
      "encode": {"update": {"height": {"signal": "child_height"}}},
      "axes": [
        {
          "scale": "y",
          "orient": "left",
          "grid": false,
          "labels": false,
          "ticks": false,
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(child_height/40)"},
          "zindex": 0
        }
      ]
    },
    {
      "name": "column_footer",
      "type": "group",
      "role": "column-footer",
      "encode": {"update": {"width": {"signal": "child_width"}}},
      "axes": [
        {
          "scale": "x",
          "orient": "bottom",
          "grid": false,
          "title": "Month",
          "format": "%b",
          "labelFlush": true,
          "labelOverlap": true,
          "tickCount": {"signal": "ceil(child_width/40)"},
          "zindex": 0
        }
      ]
    },
    {
      "name": "cell",
      "type": "group",
      "style": "cell",
      "from": {
        "facet": {
          "name": "facet",
          "data": "source_0",
          "groupby": ["hours_date"],
          "aggregate": {
            "fields": ["order"],
            "ops": ["min"],
            "as": ["order_by_hours_date"]
          }
        }
      },
      "sort": {
        "field": ["datum[\"order_by_hours_date\"]"],
        "order": ["ascending"]
      },
      "encode": {
        "update": {
          "width": {"signal": "child_width"},
          "height": {"signal": "child_height"},
          "stroke": {"value": null}
        }
      },
      "marks": [
        {
          "name": "child_marks",
          "type": "area",
          "style": ["area"],
          "sort": {"field": "datum[\"monthdate_date\"]"},
          "from": {"data": "facet"},
          "encode": {
            "update": {
              "orient": {"value": "vertical"},
              "fill": {"value": "#4c78a8"},
              "description": {
                "signal": "\"Month: \" + (timeFormat(datum[\"monthdate_date\"], '%b')) + \"; Mean of temperature: \" + (format(datum[\"mean_temperature\"], \"\"))"
              },
              "x": {"scale": "x", "field": "monthdate_date"},
              "y": {"scale": "y", "field": "mean_temperature"},
              "y2": {"field": {"group": "height"}},
              "defined": {
                "signal": "isValid(datum[\"monthdate_date\"]) && isFinite(+datum[\"monthdate_date\"]) && isValid(datum[\"mean_temperature\"]) && isFinite(+datum[\"mean_temperature\"])"
              }
            }
          }
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "time",
      "domain": {"data": "source_0", "field": "monthdate_date"},
      "range": [0, {"signal": "child_width"}]
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {"data": "source_0", "field": "mean_temperature"},
      "range": [{"signal": "child_height"}, 0],
      "zero": false,
      "nice": true
    }
  ],
  "config": {"axis": {"grid": false, "domain": false}}
}