radial_sunburst_v3

radial_sunburst_v3.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "An example of a space-fulling radial layout for hierarchical data.",
  "width": 600,
  "height": 600,
  "padding": 5,
  "autosize": "none",
  "data": [
    {
      "name": "tree",
      "url": "data/flare.json",
      "transform": [
        {"type": "stratify", "key": "id", "parentKey": "parent"},
        {
          "type": "partition",
          "field": "size",
          "sort": {"field": "value"},
          "size": [{"signal": "2 * PI"}, {"signal": "width / 2"}],
          "as": ["a0", "r0", "a1", "r1", "depth", "children"]
        },
        {
          "type": "formula",
          "expr": "datum.depth === 0 ? 'white' : datum.color",
          "as": "color"
        },
        {
          "type": "formula",
          "expr": "datum.depth > 2 && length(datum.name) > 10 ? slice(datum.name, 0, 10) + '\\n ' + slice(datum.name, 10) : datum.name",
          "as": "wrappedText"
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "tree", "field": "depth"},
      "range": {"scheme": "tableau20"}
    }
  ],
  "marks": [
    {
      "type": "arc",
      "from": {"data": "tree"},
      "encode": {
        "enter": {
          "x": {"signal": "width / 2"},
          "y": {"signal": "height / 2"},
          "fill": {"scale": "color", "field": "depth"},
          "tooltip": {"signal": "datum.name"}
        },
        "update": {
          "startAngle": {"field": "a0"},
          "endAngle": {"field": "a1"},
          "innerRadius": {"field": "r0"},
          "outerRadius": {"field": "r1"},
          "stroke": {"value": "white"},
          "strokeWidth": {"value": 0.5},
          "zindex": {"value": 0}
        },
        "hover": {
          "stroke": {"value": "red"},
          "strokeWidth": {"value": 2},
          "zindex": {"value": 1}
        }
      }
    },
    {
      "type": "text",
      "from": {"data": "tree"},
      "encode": {
        "enter": {
          "fill": {"value": "black"},
          "align": {
            "signal": "datum.depth > 2 ? (datum.a0 < PI ? 'left' : 'left') : 'center'"
          },
          "baseline": {"value": "middle"},
          "text": {"field": "wrappedText"},
          "x": {"signal": "width / 2"},
          "y": {"signal": "height / 2"},
          "radius": {
            "signal": "datum.depth > 2 ? (datum.a0 > PI ? datum.r0 + 55: datum.r0 + 5) : datum.r0 + 15 "
          },
          "theta": {"signal": "(datum.a0 + datum.a1) / 2"},
          "fontSize": {"signal": "(datum.r1 - datum.r0) > 20 ? 10 : 8"},
          "opacity": {"signal": "(datum.r1 - datum.r0) > 20 ? 1 : 0.5"},
          "angle": {
            "signal": " datum.depth > 0 ? (datum.a0 < PI ? ((datum.a0 + datum.a1) / 2) * (180 / PI) - 90 : ((datum.a0 + datum.a1) / 2) * (180 / PI) + 90) : 0"
          }
        }
      }
    }
  ]
}