Vega Lite - Mark: Area shows no values but points do

Elastic Stack Kibana
1

Hi everyone and thanks in advance,

I hope someone can point me into the right direction on this.
Why do my values only show up when I mark them as points and not line or area?
Am I missing some form of aggregation? Color?

I suspect Vega draws no connection to the next value in the timeline and thus can't generate an interpolation between them?

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
  "data": {
    "url": {
      "%context%": true,
      "%timefield%": "@timestamp",
      "index": "default-*",
      "body": {"size": 10000, "_source": ["@timestamp", "numericData"]}
    },
    "format": {"property": "hits.hits"}
  },
  "transform": [
    {"calculate": "toDate(datum._source['@timestamp'])", "as": "time"}
  ],
  "vconcat": [
    {
      "width": 1200,
      "mark": {"type": "area", "line": true, "point": true},
      "encoding": {
        "x": {
          "field": "time",
          "scale": {"domain": {"selection": "brush"}},
          "type": "temporal",
          "axis": {"title": ""}
        },
        "y": {
          "field": "_source.numericData",
          "type": "quantitative",
          "scale": {"domain": [0, 10]}
        }
      }
    },
    {
      "width": 1200,
      "height": 60,
      "mark": {"type": "area", "line": true, "point": true},  // <-- area only leaves the diagram empty
      "selection": {"brush": {"type": "interval", "encodings": ["x"]}},
      "encoding": {
        "x": {"field": "time", "type": "temporal"},
        "y": {
          "field": "_source.numericData",
          "type": "quantitative",
          "formatType": "String",
          "axis": {"tickCount": 3, "grid": false}
        }
      }
    }
  ]
}

X: timestamp
Y: integers (float)

I bet there are some crucial setting I'm not seeing from examples and tutorials I'm going through.

Maybe someone has a clue.
Thank you all for your help and support :slight_smile:

image
"Mark: Area" is not visible

2

A filter for null values or values > 0 did the trick

3

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