bar_binnedyearmonth.vg.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Google's stock price over time.",
  "background": "white",
  "padding": 5,
  "width": 200,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/stocks.csv",
      "format": {"type": "csv", "parse": {"date": "date"}},
      "transform": [
        {"type": "filter", "expr": "datum.symbol==='GOOG'"},
        {
          "type": "formula",
          "expr": "timeOffset('month', datum['date'], 1)",
          "as": "date_end"
        },
        {
          "type": "formula",
          "expr": "0.5 * timeOffset('month', datum['date'], -1) + 0.5 * datum['date']",
          "as": "date_offsetted_rect_start"
        },
        {
          "type": "formula",
          "expr": "0.5 * datum['date'] + 0.5 * datum['date_end']",
          "as": "date_offsetted_rect_end"
        },
        {
          "type": "stack",
          "groupby": ["date"],
          "field": "price",
          "sort": {"field": [], "order": []},
          "as": ["price_start", "price_end"],
          "offset": "zero"
        },
        {
          "type": "filter",
          "expr": "(isDate(datum[\"date\"]) || (isValid(datum[\"date\"]) && isFinite(+datum[\"date\"]))) && isValid(datum[\"price\"]) && isFinite(+datum[\"price\"])"
        }
      ]
    }
  ],
  "marks": [
    {
      "name": "marks",
      "type": "rect",
      "style": ["bar"],
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "fill": {"value": "#4c78a8"},
          "ariaRoleDescription": {"value": "bar"},
          "description": {
            "signal": "\"date: \" + (timeFormat(datum[\"date\"], timeUnitSpecifier([\"year\",\"month\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"}))) + \"; price: \" + (format(datum[\"price\"], \"\"))"
          },
          "x2": {
            "scale": "x",
            "field": "date_offsetted_rect_start",
            "offset": {
              "signal": "0.5 + (abs(scale(\"x\", datum[\"date_end\"]) - scale(\"x\", datum[\"date\"])) < 0.25 ? -0.5 * (0.25 - (abs(scale(\"x\", datum[\"date_end\"]) - scale(\"x\", datum[\"date\"])))) : 0.5)"
            }
          },
          "x": {
            "scale": "x",
            "field": "date_offsetted_rect_end",
            "offset": {
              "signal": "0.5 + (abs(scale(\"x\", datum[\"date_end\"]) - scale(\"x\", datum[\"date\"])) < 0.25 ? 0.5 * (0.25 - (abs(scale(\"x\", datum[\"date_end\"]) - scale(\"x\", datum[\"date\"])))) : -0.5)"
            }
          },
          "y": {"scale": "y", "field": "price_end"},
          "y2": {"scale": "y", "field": "price_start"}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "time",
      "domain": {
        "data": "source_0",
        "fields": ["date_offsetted_rect_start", "date_offsetted_rect_end"]
      },
      "range": [0, {"signal": "width"}]
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {"data": "source_0", "fields": ["price_start", "price_end"]},
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    }
  ],
  "axes": [
    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "tickMinStep": {
        "signal": "datetime(2001, 1, 1, 0, 0, 0, 0) - datetime(2001, 0, 1, 0, 0, 0, 0)"
      },
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "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": "date",
      "format": {
        "signal": "timeUnitSpecifier([\"year\",\"month\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})"
      },
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "tickMinStep": {
        "signal": "datetime(2001, 1, 1, 0, 0, 0, 0) - datetime(2001, 0, 1, 0, 0, 0, 0)"
      },
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "price",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ]
}