Object library · stream board (proposal 4)

# Proposal 4 · Mix-first ("the stream board"). A waste stream (a mix: types by composition, CONTRACT.md) is the page:
# its composition as bars, the share table with an example object per type, and, in objects.base beside this file,
# the sampled objects of that stream as 3D cards with their mass distribution. On the prototype page one stream picker
# drives both files' filters (a dashboard: what <data-dashboard> will do once that lane lands). The question it answers
# (Zach, Oct 15): a stream's mix and quick analysis, min/max weight, weight distribution, min/max size. New views.
# The public sample has one mix: RECYC-QUEBEC's published 2023-24 municipal audit, mapped onto the library's types.
# Check it: node bin/data-ui.mjs check gallery/examples/object-db-streams/views.base
data: ../object-db-shelf/mixes.json
facets:
  - { property: mix_name, as: select, label: Stream, dropdown: true }
properties:
  mix_name: { displayName: Stream }
  type: { displayName: Type }
  share: { displayName: Share }
  example: { displayName: Example object }
  objects_in_sample: { displayName: Objects sampled }
  typical_mass_g: { displayName: Typical mass }
views:
  - type: chart
    name: Composition
    chart:
      mark: { type: bar }
      encoding:
        y: { field: type, sort: "-x", title: null }
        x: { field: share, axis: { format: "%" }, title: "Share of the stream" }
        color: { field: mix_name, title: Stream }
    hover: { image: thumbnail, title: type, fields: [share, example, typical_mass_g, objects_in_sample] }
  - type: table
    name: Shares
    order: [type, share, example, objects_in_sample, typical_mass_g, mix_name]
    display: { share: bar, thumbnail: image }
    groupBy: { property: mix_name, direction: ASC }
    sort:
      - { property: share, direction: DESC }
  - type: pivot
    name: Streams × types
    splitBy: [mix_name]
    groupBy: { property: type, direction: ASC }
    value: { property: share, summary: Sum }

// ../object-db-shelf/mixes.json: 31 rows, 22 KB; the first 3
{
 "id": "bam-mixes",
 "title": "Mix compositions",
 "titleProperty": "type",
 "imageProperty": "thumbnail",
 "source": "RECYC-QUEBEC, Etude de caracterisation des matieres recyclables, centres de tri 2023-2024, municipal column (https://www.recyc-quebec.gouv.qc.ca/sites/default/files/documents/etude-caracterisation-centre-de-tri-2023-2024.pdf#page=15), mapped onto BAM's object types",
 "properties": {
  "share": {
   "type": "number",
   "decimals": 3
  },
  "mix_name": {
   "type": "text",
   "facet": "values"
  },
  "typical_mass_g": {
   "type": "number",
   "unitText": "g"
  },
  "objects_in_sample": {
   "type": "number",
   "decimals": 0
  },
  "thumbnail": {
   "type": "text",
   "media": "image",
   "hidden": true
  },
  "mesh": {
   "type": "text",
   "media": "mesh",
   "hidden": true
  },
  "mesh_view": {
   "type": "text",
   "hidden": true
  },
  "id": {
   "type": "text"
  },
  "mix": {
   "type": "text"
  },
  "basis": {
   "type": "text"
  },
  "measured": {
   "type": "boolean"
  },
  "type": {
   "type": "text"
  },
  "example": {
   "type": "text"
  }
 },
 "rows": [
  {
   "id": "recyc-quebec-municipal-2023:corrugated-cardboard",
   "mix": "recyc-quebec-municipal-2023",
   "mix_name": "Household recycling, Quebec municipal (RECYC-QUEBEC 2023-24 audit)",
   "basis": "mass",
   "measured": true,
   "type": "corrugated-cardboard",
   "share": {
    "value": 0.237,
    "basis": "measured",
    "note": "RECYC-QUÉBEC 2023-24, municipal column: \"Carton ondulé (OCC)\" 23.7% = 23.70%. Direct."
   },
   "typical_mass_g": 20.6,
   "objects_in_sample": 5,
   "example": "Google Cardboard kit box",
   "thumbnail": "thumbs/gso_google_cardboard_original_package.webp",
   "mesh": "meshes/gso_google_cardboard_original_package.glb",
   "mesh_view": {
    "dir": [
     0.9,
     0.8,
     1.1
    ],
    "fov": 30,
    "camera": "scan",
    "box": [
     0.0039,
     0.2188,
     0.9961,
     0.7695
    ]
   }
  },
  {
   "id": "recyc-quebec-municipal-2023:paper-sheet",
   "mix": "recyc-quebec-municipal-2023",
   "mix_name": "Household recycling, Quebec municipal (RECYC-QUEBEC 2023-24 audit)",
   "basis": "mass",
   "measured": true,
   "type": "paper-sheet",
   "share": {
    "value": 0.156,
    "basis": "measured",
    "note": "RECYC-QUÉBEC 2023-24, municipal column: \"Papier journal\" 1.5% + \"Publications et circulaires\" 3.6% + \"Bottins, catalogues\" 0.4% + \"Revues, magazines\" 1.3% + \"Papier à usage général/bureau\" 2.7% + \"Autres imprimés\" 2.6% + \"Livres\" 1.5% + \"Sacs d'emplettes de papier kraft\" 0.9% + \"Emballages de papier kraft\" 0.7% + \"Papier laminé\" 0.4% = 15.60%. Printed paper, books and kraft paper."
   },
   "typical_mass_g": 5,
   "objects_in_sample": 0,
   "example": null,
   "thumbnail": null,
   "mesh": null,
   "mesh_view": null
  },
  {
   "id": "recyc-quebec-municipal-2023:paperboard-box",
   "mix": "recyc-quebec-municipal-2023",
   "mix_name": "Household recycling, Quebec municipal (RECYC-QUEBEC 2023-24 audit)",
   "basis": "mass",
   "measured": true,
   "type": "paperboard-box",
   "share": {
    "value": 0.128,
    "basis": "measured",
    "note": "RECYC-QUÉBEC 2023-24, municipal column: \"Carton plat d'emballage (boxboard)\" 10.7% + \"Carton pressé\" 1.1% + \"Contenants composites\" 0.3% + \"Contenants laminés\" 0.3% + \"Autres emballages de papier\" 0.3% + \"Carton servant à présenter (non visé)\" 0.1% = 12.80%. Cereal-type boxboard and paper containers."
   },
   "typical_mass_g": 100,
   "objects_in_sample": 34,
   "example": "Apples to Apples Kids box",
   "thumbnail": "thumbs/gso_apples_to_apples_kids_edition.webp",
   "mesh": "meshes/gso_apples_to_apples_kids_edition.glb",
   "mesh_view": {
    "dir": [
     0.9,
     0.8,
     1.1
    ],
    "fov": 30,
    "camera": "scan",
    "box": [
     0.0039,
     0.1445,
     0.9961,
     0.8555
    ]
   }
  }
 ]
}