{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 400,
  "height": 400,

  "data": [
    {
      "name": "table",
      "values": [12, 23, 47, 6, 52, 19],
      "transform": [{"type": "pie", "field": "data"}]
    }
  ],

  "scales": [
    {
      "name": "r",
      "type": "sqrt",
      "domain": {"data": "table", "field": "data"},
      "zero": true,
      "range": [20, 100]
    }
  ],

  "marks": [
    {
      "type": "arc",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"field": {"group": "width"}, "mult": 0.5},
          "y": {"field": {"group": "height"}, "mult": 0.5},
          "startAngle": {"field": "startAngle"},
          "endAngle": {"field": "endAngle"},
          "innerRadius": {"value": 20},
          "outerRadius": {"scale": "r", "field": "data"},
          "stroke": {"value": "#fff"}
        },
        "update": {
          "fill": {"value": "#ccc"}
        },
        "hover": {
          "fill": {"value": "pink"}
        }
      }
    },

    {
      "type": "text",
      "from": {"data": "table"},
      "encode": {
        "enter": {
          "x": {"field": {"group": "width"}, "mult": 0.5},
          "y": {"field": {"group": "height"}, "mult": 0.5},
          "radius": {"scale": "r", "field": "data", "offset": 8},
          "theta": {"signal": "(datum.startAngle + datum.endAngle)/2"},
          "fill": {"value": "#000"},
          "align": {"value": "center"},
          "baseline": {"value": "middle"},
          "text": {"field": "data"}
        }
      }
    }
  ]
}