singleview_5_20_circular.vg.json

{
  "$schema": "https://vega.github.io/schema/vega/v3.0.json", 
  "config":{"background":"#ffffff"},
  "width": 810,
  "height": 810,
  "padding": 20,

  "signals": [
    {
      "name": "labels", "value": true,
      "bind": {"input": "checkbox"}
    },
    {
      "name": "radius", "value": 260
    },
    {
      "name": "links", "value": "diagonal",
      "bind": {
        "input": "radio",
        "options": ["line", "curve", "diagonal"]
      }
    },
    { "name": "originX", "update": "width / 2" },
    { "name": "originY", "update": "height / 2" },
    {
      "name": "active", "value": null,
      "on": [
        { "events": "text:mouseover, symbol:mouseover", "update": "datum.index" },
        { "events": "mouseover[!event.item]", "update": "null" }
      ]
    },
    { "description": "throttles the number of nodes rendered; 77 covers 'all'",
      "name": "numNodes", "value": 30 }
  ],

  "data": [
    {
      "name": "nodes",
      "url": "data/miserables.json",
      "format": {"type": "json", "property": "nodes"},
      "transform": [
        { "type": "filter",
          "expr": "datum.index < numNodes" },  
        {"type": "collect", "sort": {"field": "group"}},
        {"type": "pie", "as": ["_", "angle"]},
        {
          "type": "formula",
          "expr": "originX + radius * cos(datum.angle)",
          "as":   "x"
        },
        {
          "type": "formula",
          "expr": "originY + radius * sin(datum.angle)",
          "as":   "y"
        },
        {
          "type": "formula",
          "expr": "inrange(datum.angle, [PI/2, 1.5*PI])",
          "as":   "leftside"
        }
      ]
    },
    {
      "name": "links",
      "url": "data/miserables.json",
      "format": {"type": "json", "property": "links"},
      "transform": [
        { "type": "filter",
          "expr": "datum.source < numNodes" },  
        { "type": "filter",
          "expr": "datum.target < numNodes" },  
        {
          "type": "lookup",
          "from": "nodes",
          "key": "index",
          "fields": ["source"],
          "as": ["source"]
        },
        {
          "type": "lookup",
          "from": "nodes",
          "key": "index",
          "fields": ["target"],
          "as": ["target"]
        }
      ]
    }
  ],

  "scales": [
    {
      "name": "color",
      "type": "ordinal",
      "range": {"scheme": "category20"}
    }
  ],

  "marks": [
    {
      "type": "path",
      "from": {"data": "links"},
      "interactive": false,
      "encode": {
        "update": {
          "stroke": [
            {"test": "datum.source.index === active || datum.target.index === active", "value": "steelblue"},
            {"value": "#111111"}
          ],
          "strokeWidth": [
            {"test": "datum.source.index === active || datum.target.index === active", "value": 2},
            {"value": 1}
          ],
          "strokeOpacity": { "value": 1 }
        }
      },
      "transform": [
        {
          "type": "linkpath",
          "shape": {"signal": "links"},
          "sourceX": "datum.source.x", "sourceY": "datum.source.y",
          "targetX": "datum.target.x", "targetY": "datum.target.y"
        }
      ]
    },
    {
      "type": "symbol",
      "from": {"data": "nodes"},
      "encode": {
        "enter": {
          "size": {"value": 100},
          "stroke": {"value": "#fff"}
        },
        "update": {
          "x": {"field": "x"},
          "y": {"field": "y"},
          "fill": {"scale": "color", "field": "group"}
        }
      }
    },
    {
      "type": "text",
      "from": {"data": "nodes"},
      "encode": {
        "enter": {
          "text": {"field": "name"},
          "fontSize": {"value": 14},
          "baseline": {"value": "middle"}
        },
        "update": {
          "x": {"field": "x"},
          "y": {"field": "y"},
          "dx": {"signal": "(datum.leftside ? -1 : 1) * 10"},
          "angle": {"signal": "datum.leftside ? datum.angle/PI*180 - 180 : datum.angle/PI*180"},
          "align": {"signal": "datum.leftside ? 'right' : 'left'"},
          "opacity": {"signal": "labels ? 1 : 0"}
        }
      }
    }
  ]
}