Categorial Treemap

spec.json

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "description": "Treemap visualization using Deneb with Power BI data.",
  "autosize": {
    "type": "fit",
    "contains": "padding"
  },
  "padding": 0,
  "signals": [
    {
      "name": "layout",
      "value": "squarify"
    },
    {
      "name": "aspectRatio",
      "value": 1
    }
  ],
  "data": [
    {
      "name": "dataset",
      "values": [
      {
        "Ticker": "AAPL",
        "Category": "Technology",
        "Subcategory": "Consumer Electronics",
        "Market Cap": 3287742584880,
        "% Change": 0.019519094766619588
      },
      {
        "Ticker": "AMD",
        "Category": "Technology",
        "Subcategory": "Semiconductors",
        "Market Cap": 217313557328.15,
        "% Change": -0.0031182715866061883
      },
      {
        "Ticker": "AMZN",
        "Category": "Consumer Discretionary",
        "Subcategory": "E-commerce and Cloud Computing",
        "Market Cap": 1752129935114.14,
        "% Change": 0.0032451923076922597
      },
      {
        "Ticker": "AVGO",
        "Category": "Technology",
        "Subcategory": "Semiconductors",
        "Market Cap": 690313063292.3999,
        "% Change": 0.028155339805825262
      },
      {
        "Ticker": "DIS",
        "Category": "Communication Services",
        "Subcategory": "Entertainment",
        "Market Cap": 156349368029.8,
        "% Change": 0.0009288285150353919
      },
      {
        "Ticker": "GOOGL",
        "Category": "Communication Services",
        "Subcategory": "Internet Content and Information",
        "Market Cap": 2014777699999.9998,
        "% Change": 0.022873570401849865
      },
      {
        "Ticker": "INTC",
        "Category": "Technology",
        "Subcategory": "Semiconductors",
        "Market Cap": 8390292559.96,
        "% Change": -0.018426294820717004
      },
      {
        "Ticker": "META",
        "Category": "Technology",
        "Subcategory": "Social Media and Internet Services",
        "Market Cap": 1390863220200.81,
        "% Change": 0.01981444601120719
      },
      {
        "Ticker": "MU",
        "Category": "Technology",
        "Subcategory": "Semiconductors",
        "Market Cap": 103073823678.8,
        "% Change": 0.01405381489747053
      },
      {
        "Ticker": "NFLX",
        "Category": "Communication Services",
        "Subcategory": "Entertainment",
        "Market Cap": null,
        "% Change": 0.017575626107963283
      },
      {
        "Ticker": "NVDA",
        "Category": "Technology",
        "Subcategory": "Semiconductors",
        "Market Cap": 2576676321357.5,
        "% Change": -0.00842483907610754
      },
      {
        "Ticker": "TSLA",
        "Category": "Consumer Cyclical",
        "Subcategory": "Auto Manufacturers",
        "Market Cap": 637839233400,
        "% Change": 0.01497081958893766
      },
      {
        "Ticker": "TXN",
        "Category": "Technology",
        "Subcategory": "Semiconductors",
        "Market Cap": 175496564548.23,
        "% Change": 0.006229714166055898
      }
    ],
    "transform": [
        {
          "type": "nest",
          "generate": true,
          "keys": [
            "Category",
            "Subcategory"
          ]
        },
        {
          "type": "treemap",
          "field": "Market Cap",
          "sort": {
            "field": "Market Cap"
          },
          "round": true,
          "method": {
            "signal": "layout"
          },
          "ratio": {
            "signal": "aspectRatio"
          },
          "size": [
            {
              "signal": "width"
            },
            {
              "signal": "height"
            }
          ]
        }
      ]
    },
    {
      "name": "nodes",
      "source": "dataset",
      "transform": [
        {
          "type": "filter",
          "expr": "datum.children"
        }
      ]
    },
    {
      "name": "leaves",
      "source": "dataset",
      "transform": [
        {
          "type": "filter",
          "expr": "!datum.children"
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "color",
      "type": "linear",
      "domain": [
        -0.03,
        -0.02,
        -0.01,
        0,
        0.01,
        0.02,
        0.03
      ],
      "range": [
        "#e44841",
        "#aa4d46",
        "#814753",
        "#262930",
        "#487753",
        "#559c4e",
        "#68c866"
      ]
    },
    {
      "name": "size",
      "type": "ordinal",
      "domain": [0, 1, 2, 3],
      "range": [256, 28, 20, 14]
    },
    {
      "name": "opacity",
      "type": "ordinal",
      "domain": [0, 1, 2, 3],
      "range": [0.15, 0.5, 0.8, 1.0]
    }
  ],
  "layout": {
    "padding": 5,
    "bounds": "flush",
    "center": true,
    "headerBand": 1
  },
  "marks": [
    // {
    //   "type": "rect",
    //   "from": {"data": "nodes"},
    //   "interactive": false,
    //   "encode": {
    //     "enter": {
    //       "fill": {"scale": "color", "field": "Category"}
    //     },
    //     "update": {
    //       "x": {"field": "x0"},
    //       "y": {"field": "y0"},
    //       "x2": {"field": "x1"},
    //       "y2": {"field": "y1"}
    //     }
    //   }
    // },
    {
      "type": "group",
      "from": {
        "facet": {
          "data": "leaves",
          "name": "facet",
          "groupby": [ "Category", "Subcategory" ]
        }
      },
      "encode": {
        "enter": {
          "x": {
            "field": "x"
          },
          "y": {
            "field": "y"
          }
        }
      },
      "marks": [
        
        // Treemap Content
        {
          "type": "rect",
          "from": {
            "data": "facet"
          },
          "encode": {
            "enter": {
              "fill": {
                "scale": "color",
                "field": "% Change"
              },
              "stroke": {
                "value": "#262930"
              }
            },
            "update": {
              "x": {
                "field": "x0"
              },
              "y": {
                "signal": "datum.y0 + 30"
              }, // Adjust for header height
              "x2": {
                "field": "x1"
              },
              "y2": {
                "field": "y1"
              }
            }
          }
        },
        {
          "type": "text",
          "from": {
            "data": "facet"
          },
          "interactive": false,
          "encode": {
            "enter": {
              "align": {
                "value": "center"
              },
              "baseline": {
                "value": "middle"
              },
              "fill": {
                "value": "#fff"
              },
              "text": {
                "field": "Ticker"
              },
              "fontSize": {
                "value": 36
              },
              "fontWeight": {
                "value": "bold"
              }
            },
            "update": {
              "x": {
                "signal": "0.5 * (datum.x0 + datum.x1)"
              },
              "y": {
                "signal": "datum.y0 + 0.5 * (datum.y1 - datum.y0) - 10"
              }
            }
          }
        },
        {
          "type": "text",
          "from": {
            "data": "facet"
          },
          "interactive": false,
          "encode": {
            "enter": {
              "align": {
                "value": "center"
              },
              "baseline": {
                "value": "middle"
              },
              "fill": {
                "value": "#fff"
              },
              "text": {
                "signal": "datum['% Change']"
              },
              "fontSize": {
                "value": 20
              }
            },
            "update": {
              "x": {
                "signal": "0.5 * (datum.x0 + datum.x1)"
              },
              "y": {
                "signal": "datum.y0 + 0.5 * (datum.y1 - datum.y0) + 20"
              }
            }
          }
        }
      ]
    }
    ,{
      "type": "text",
      "from": {"data": "nodes"},
      "interactive": false,
      "encode": {
        "enter": {
          "align": {"value": "center"},
          "baseline": {"value": "middle" },
          "fill": {"value": "#fff"},
          "text": {"field": "key"},
          "fontSize": {"scale": "size", "field": "depth"},
          "fillOpacity": {"scale": "opacity", "field": "depth"}
        },
        "update": {
          "x": {"signal": "0.5 * (datum.x0 + datum.x1)"},
          "y": {"signal": "0.5 * (datum.y0 + datum.y1)"}
        }
      }
    }
  ]
}