{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "A simple pie chart with embedded data.",
  "background": "white",
  "padding": 5,
  "height": 200,
  "data": [
    {"name": "source_0", "values": [{}]},
    {
      "name": "source_1",
      "values": [
        {"category": 1, "value": 4},
        {"category": 2, "value": 6},
        {"category": 3, "value": 10},
        {"category": 4, "value": 3},
        {"category": 5, "value": 7},
        {"category": 6, "value": 8}
      ]
    },
    {
      "name": "data_0",
      "source": "source_1",
      "transform": [
        {
          "type": "stack",
          "groupby": [],
          "field": "value",
          "sort": {"field": ["category"], "order": ["ascending"]},
          "as": ["value_start", "value_end"],
          "offset": "zero"
        },
        {
          "type": "filter",
          "expr": "isValid(datum[\"value\"]) && isFinite(+datum[\"value\"])"
        }
      ]
    }
  ],
  "signals": [
    {"name": "childWidth", "value": 200},
    {
      "name": "radius",
      "value": 0,
      "bind": {"input": "range", "min": 0, "max": 100, "step": 1}
    },
    {
      "name": "radius2",
      "value": 50,
      "bind": {"input": "range", "min": 0, "max": 100, "step": 1}
    },
    {
      "name": "theta_single_arc",
      "value": -0.73,
      "bind": {"input": "range", "min": -6.28, "max": 6.28}
    },
    {
      "name": "theta2_single_arc",
      "value": 0.73,
      "bind": {"input": "range", "min": -6.28, "max": 6.28}
    },
    {
      "name": "cornerRadius",
      "value": 0,
      "bind": {"input": "range", "min": 0, "max": 50, "step": 1}
    },
    {
      "name": "padAngle",
      "value": 0,
      "bind": {"input": "range", "min": 0, "max": 1.57}
    },
    {
      "name": "strokeWidth",
      "value": 4,
      "bind": {"input": "range", "min": 0, "max": 10, "step": 0.5}
    }
  ],
  "layout": {"padding": 20, "bounds": "full", "align": "each"},
  "marks": [
    {
      "type": "group",
      "name": "concat_0_group",
      "title": {"text": "Single Arc", "frame": "group"},
      "encode": {
        "update": {
          "width": {"signal": "childWidth"},
          "height": {"signal": "height"}
        }
      },
      "marks": [
        {
          "name": "concat_0_marks",
          "type": "arc",
          "style": ["arc"],
          "from": {"data": "source_0"},
          "encode": {
            "update": {
              "strokeWidth": {"signal": "strokeWidth"},
              "padAngle": {"signal": "padAngle"},
              "radius": {"signal": "radius"},
              "cornerRadius": {"signal": "cornerRadius"},
              "fill": {"value": "#4c78a8"},
              "x": {"signal": "childWidth", "mult": 0.5},
              "y": {"signal": "height", "mult": 0.5},
              "outerRadius": {"signal": "radius"},
              "innerRadius": {"signal": "radius2"},
              "startAngle": {"signal": "theta_single_arc"},
              "endAngle": {"signal": "theta2_single_arc"}
            }
          }
        }
      ]
    },
    {
      "type": "group",
      "name": "concat_1_group",
      "title": {"text": "Stacked Arcs", "frame": "group"},
      "encode": {
        "update": {
          "width": {"signal": "childWidth"},
          "height": {"signal": "height"}
        }
      },
      "marks": [
        {
          "name": "concat_1_marks",
          "type": "arc",
          "style": ["arc"],
          "from": {"data": "data_0"},
          "encode": {
            "update": {
              "strokeWidth": {"signal": "strokeWidth"},
              "padAngle": {"signal": "padAngle"},
              "radius": {"signal": "radius"},
              "cornerRadius": {"signal": "cornerRadius"},
              "fill": {"scale": "color", "field": "category"},
              "description": {
                "signal": "\"value: \" + (format(datum[\"value\"], \"\")) + \"; category: \" + (isValid(datum[\"category\"]) ? datum[\"category\"] : \"\"+datum[\"category\"])"
              },
              "x": {"signal": "childWidth", "mult": 0.5},
              "y": {"signal": "height", "mult": 0.5},
              "outerRadius": {"signal": "radius"},
              "innerRadius": {"signal": "radius2"},
              "startAngle": {"scale": "concat_1_theta", "field": "value_end"},
              "endAngle": {"scale": "concat_1_theta", "field": "value_start"}
            }
          }
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "data_0", "field": "category", "sort": true},
      "range": "category"
    },
    {
      "name": "concat_1_theta",
      "type": "linear",
      "domain": {"data": "data_0", "fields": ["value_start", "value_end"]},
      "range": [0, 6.283185307179586],
      "zero": true
    }
  ],
  "legends": [{"fill": "color", "symbolType": "circle", "title": "category"}]
}