{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "width": 1000,
  "height": 600,
  "padding": 5,

  "signals": [
  ],

  "data": [
    {
      "name": "tree",
      "values": desc_json,
      "transform": [
        {
          "type": "stratify",
          "key": "id",
          "parentKey": "parent"
        },
        {
          "type": "tree",
          "method": "tidy",
          "size": [{"signal": "width - 100"}, {"signal": "height"}],
          "separation": false,
          "as": ["x", "y", "depth", "children"]
        }
      ]
    },
    {
      "name": "links",
      "source": "tree",
      "transform": [
        { "type": "treelinks" },
        {
          "type": "linkpath",
          "orient": "vertical",
          "shape": "diagonal"
        }
      ]
    }
  ],

  "scales": [
    {
      "name": "color",
      "type": "ordinal",
      "domain": { "fields": [{"data": "tree", "field": "c"}
                            ,{"data": "tree", "field": "c"}], "sort": true},
      "range": {"scheme": colour_scheme}
    }
  ],

  "marks": [
    {
      "type": "path",
      "from": {"data": "links"},
      "encode": {
        "update": {
          "path": {"field": "path"},
          "stroke": {"value": "#ccc"}
        }
      }
    },
    {
      "type": "symbol",
      "from": {"data": "tree"},
      "encode": {
        "enter": {
          "size": {"value": 500},
          "stroke": {"value": "black"},
          "tooltip": {"signal": "datum.name"}
        },
        "update": {
          "x": {"field": "x"},
          "y": {"field": "y"},
          "fill": {"scale": "color", "field": "c"}
        }
      }
    },
    {
      "type": "text",
      "from": {"data": "tree"},
      "encode": {
        "enter": {
          "text": {"field": "ccs"},
          "fontSize": {"value": 9},
          "baseline": {"value": "middle"}
        },
        "update": {
          "x": {"field": "x"},
          "y": {"field": "y"},
          "angle": {"signal": "datum.children ? 0 : 0"},
          "dy": {"signal": "datum.children ? 0 : 0"},
          "dx": {"signal": "datum.children ? 0 : 0"},
          "align": {"signal": "datum.children ? 'center' : 'center'"},
          "opacity": 0
        }
      }
    }
  ]
}