interactive_multi_line_tooltip.vg.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "width": 200,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "hover_store",
      "transform": [{"type": "collect", "sort": {"field": "_vgsid_"}}]
    },
    {
      "name": "source_0",
      "url": "data/seattle-weather.csv",
      "format": {"type": "csv", "parse": {"date": "date"}},
      "transform": [
        {"type": "identifier", "as": "_vgsid_"},
        {
          "field": "date",
          "type": "timeunit",
          "units": ["year", "month", "date"],
          "as": ["yearmonthdate_date", "yearmonthdate_date_end"]
        }
      ]
    },
    {
      "name": "data_0",
      "source": "source_0",
      "transform": [
        {
          "type": "filter",
          "expr": "(isDate(datum[\"yearmonthdate_date\"]) || (isValid(datum[\"yearmonthdate_date\"]) && isFinite(+datum[\"yearmonthdate_date\"])))"
        }
      ]
    }
  ],
  "signals": [
    {
      "name": "unit",
      "value": {},
      "on": [
        {"events": "mousemove", "update": "isTuple(group()) ? group() : unit"}
      ]
    },
    {
      "name": "hover",
      "update": "vlSelectionResolve(\"hover_store\", \"union\", true, true)"
    },
    {
      "name": "hover_tuple",
      "on": [
        {
          "events": [{"source": "scope", "type": "mouseover"}],
          "update": "datum && item().mark.marktype !== 'group' ? {unit: \"layer_2\", _vgsid_: (item().isVoronoi ? datum.datum : datum)[\"_vgsid_\"]} : null",
          "force": true
        },
        {"events": [{"source": "view", "type": "dblclick"}], "update": "null"}
      ]
    },
    {
      "name": "hover_toggle",
      "value": false,
      "on": [
        {
          "events": [{"source": "scope", "type": "mouseover"}],
          "update": "event.shiftKey"
        },
        {"events": [{"source": "view", "type": "dblclick"}], "update": "false"}
      ]
    },
    {
      "name": "hover_modify",
      "on": [
        {
          "events": {"signal": "hover_tuple"},
          "update": "modify(\"hover_store\", hover_toggle ? null : hover_tuple, hover_toggle ? null : true, hover_toggle ? hover_tuple : null)"
        }
      ]
    }
  ],
  "marks": [
    {
      "name": "layer_0_marks",
      "type": "line",
      "style": ["line"],
      "sort": {"field": "datum[\"yearmonthdate_date\"]"},
      "interactive": true,
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "stroke": {"value": "orange"},
          "tooltip": {
            "signal": "{\"date (year-month-date)\": timeFormat(datum[\"yearmonthdate_date\"], timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})), \"temp_max\": format(datum[\"temp_max\"], \"\"), \"temp_min\": format(datum[\"temp_min\"], \"\")}"
          },
          "description": {
            "signal": "\"date (year-month-date): \" + (timeFormat(datum[\"yearmonthdate_date\"], timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"}))) + \"; temp_max: \" + (format(datum[\"temp_max\"], \"\")) + \"; temp_min: \" + (format(datum[\"temp_min\"], \"\"))"
          },
          "x": {"scale": "x", "field": "yearmonthdate_date"},
          "y": {"scale": "y", "field": "temp_max"},
          "defined": {
            "signal": "isValid(datum[\"yearmonthdate_date\"]) && isFinite(+datum[\"yearmonthdate_date\"]) && isValid(datum[\"temp_max\"]) && isFinite(+datum[\"temp_max\"])"
          }
        }
      }
    },
    {
      "name": "layer_1_marks",
      "type": "line",
      "style": ["line"],
      "sort": {"field": "datum[\"yearmonthdate_date\"]"},
      "interactive": true,
      "from": {"data": "source_0"},
      "encode": {
        "update": {
          "stroke": {"value": "red"},
          "tooltip": {
            "signal": "{\"date (year-month-date)\": timeFormat(datum[\"yearmonthdate_date\"], timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})), \"temp_max\": format(datum[\"temp_max\"], \"\"), \"temp_min\": format(datum[\"temp_min\"], \"\")}"
          },
          "description": {
            "signal": "\"date (year-month-date): \" + (timeFormat(datum[\"yearmonthdate_date\"], timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"}))) + \"; temp_min: \" + (format(datum[\"temp_min\"], \"\")) + \"; temp_max: \" + (format(datum[\"temp_max\"], \"\"))"
          },
          "x": {"scale": "x", "field": "yearmonthdate_date"},
          "y": {"scale": "y", "field": "temp_min"},
          "defined": {
            "signal": "isValid(datum[\"yearmonthdate_date\"]) && isFinite(+datum[\"yearmonthdate_date\"]) && isValid(datum[\"temp_min\"]) && isFinite(+datum[\"temp_min\"])"
          }
        }
      }
    },
    {
      "name": "layer_2_marks",
      "type": "rule",
      "style": ["rule"],
      "interactive": true,
      "from": {"data": "data_0"},
      "encode": {
        "update": {
          "stroke": [
            {
              "test": "length(data(\"hover_store\")) && vlSelectionIdTest(\"hover_store\", datum)",
              "value": "black"
            },
            {"value": "transparent"}
          ],
          "tooltip": {
            "signal": "{\"date (year-month-date)\": timeFormat(datum[\"yearmonthdate_date\"], timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})), \"temp_max\": format(datum[\"temp_max\"], \"\"), \"temp_min\": format(datum[\"temp_min\"], \"\")}"
          },
          "description": {
            "signal": "\"date (year-month-date): \" + (timeFormat(datum[\"yearmonthdate_date\"], timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"}))) + \"; temp_max: \" + (format(datum[\"temp_max\"], \"\")) + \"; temp_min: \" + (format(datum[\"temp_min\"], \"\"))"
          },
          "x": {"scale": "x", "field": "yearmonthdate_date"},
          "y": {"value": 0},
          "y2": {"field": {"group": "height"}}
        }
      }
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "time",
      "domain": {
        "fields": [
          {"data": "source_0", "field": "yearmonthdate_date"},
          {"data": "data_0", "field": "yearmonthdate_date"}
        ]
      },
      "range": [0, {"signal": "width"}]
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {"data": "source_0", "fields": ["temp_max", "temp_min"]},
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    }
  ],
  "axes": [
    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "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 (year-month-date)",
      "format": {
        "signal": "timeUnitSpecifier([\"year\",\"month\",\"date\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})"
      },
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "temp_max, temp_min",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ],
  "config": {"axisY": {"minExtent": 30}}
}