Tooltip position in vega is wrong

Elastic Stack Kibana
1

Hello,

I'm using version 8.6.0 in elastic cloud.

I would like to know what I can do so that the tooltip is in the correct position. I noticed that this bug often happens when I use a mark of type group. The code below is just an example of the reported issue.

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",

  "width": 400,
  "height": 120,
  "autosize": {"type": "none"},
  "padding": {"left": 20, "top": 5, "right": 20, "bottom": 5},

  "signals": [
    {"name": "offset_chart", "update": "30"},
    {"name": "pie_size", "update": "100"}
  ],

  "data": [
    {
      "name": "table",
      "values": [
        {"id": 1, "field": 4, "percentage": 0.2},
        {"id": 2, "field": 6, "percentage": 0.3},
        {"id": 3, "field": 10, "percentage": 0.5}
      ]
    },
    {
      "name": "pie_data",
      "source": "table",
      "transform": [
        {
          "type": "pie",
          "field": "field"
        }
      ]
    }
  ],

  "marks": [
    {
      "type": "group",
      "encode": {
        "update": {
          "y": {"value": 0},
          "x": {"value": 0},
          "height": {"signal": "height"},
          "width": {"signal": "pie_size"}
        }
      },

      "scales": [
        {
          "name": "color",
          "type": "ordinal",
          "domain": {"data": "table", "field": "id"},
          "range": {"scheme": "category20"}
        }
      ],

      "marks": [
        {
          "type": "arc",
          "from": {"data": "pie_data"},
          "encode": {
            "enter": {
              "fill": {"scale": "color", "field": "id"}
            },
            "update": {
              "x": {"signal": "pie_size/2"},
              "y": {"signal": "height/2"},
              "startAngle": {"field": "startAngle"},
              "endAngle": {"field": "endAngle"},
              "innerRadius": {"signal": "pie_size/2*0.7"},
              "outerRadius": {"signal": "pie_size/2"}
            }
          }
        }
      ]
    },
    {
      "type": "group",
      "encode": {
        "update": {
          "y": {"value": 0},
          "x": {"signal": "pie_size+offset_chart"},
          "height": {"signal": "height"},
          "width": {"signal": "width-offset_chart-pie_size"}
        }
      },

      "marks": [
        {
          "type": "text",
          "encode": {
            "enter": {
              "align": {"value": "left"},
              "baseline": {"value": "middle"},
              "fill": {"value": "#404040"},
              "tooltip": [
                {"signal": "'Description id 1'"}
              ]
            },
            "update": {
              "x": {"value": 4},
              "y": {"signal": "height/4"},
              "text": {"value": "Title id 1:"},
              "fontSize": {"signal": "20"},
              "opacity": {"value": 1}
            },
            "hover": {
              "opacity": {"value": 0.7}
            }
          }
        },
        {
          "type": "text",
          "encode": {
            "enter": {
              "align": {"value": "left"},
              "baseline": {"value": "middle"},
              "fill": {"value": "#404040"},
              "tooltip": [
                {"signal": "'Description id 2'"}
              ]
            },
            "update": {
              "x": {"value": 4},
              "y": {"signal": "2*height/4"},
              "text": {"value": "Title id 2:"},
              "fontSize": {"signal": "20"},
              "opacity": {"value": 1}
            },
            "hover": {
              "opacity": {"value": 0.7}
            }
          }
        },
        {
          "type": "text",
          "encode": {
            "enter": {
              "align": {"value": "left"},
              "baseline": {"value": "middle"},
              "fill": {"value": "#404040"},
              "tooltip": [
                {"signal": "'Description id 3'"}
              ]
            },
            "update": {
              "x": {"value": 4},
              "y": {"signal": "3*height/4"},
              "text": {"value": "Title id 3:"},
              "fontSize": {"signal": "20"},
              "opacity": {"value": 1}
            },
            "hover": {
              "opacity": {"value": 0.7}
            }
          }
        },
        {
          "type": "text",
          "name": "eligible_value",
          "from": {"data": "table"},
          "encode": {
            "enter": {
              "align": {"value": "center"},
              "baseline": {"value": "middle"},
              "fill": {"value": "#404040"},
              "tooltip": {"signal": "{'Percentage': format(datum.percentage,'.1%')}"}
            },
            "update": {
              "x": {"signal": "(width-offset_chart-pie_size)*0.9"},
              "y": {"signal": "datum.id*height/4"},
              "text": {"signal": "datum.field"},
              "fontSize": {"signal": "20"},
              "opacity": {"value": 1}
            },
            "hover": {
              "opacity": {"value": 0.7}
            }
          }
        }
      ]
    }
  ]
}

I don't understand why the title tooltip is in the correct position (Figure 1) and the value is not (Figure 2).

Figure 1:
fig1

Figure2:
fig2

This example is not too far away, but there are cases where the tooltip does not even appear.

2

mmm recently I've logged an issue about tooltips in Vega within Kibana: [Vega] Incorrect position for Vega mark tooltips on small multiple scenario · Issue #163815 · elastic/kibana · GitHub
Perhaps this can be related.

3

Yes, they are related. However, I tried to remove the elastic theme stylling but it still didn't work.

4

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