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@mk7s/holochart-core

v0.1.0-alpha.0

Published

Figure model, attribute schema system, validation, defaults, and update planning.

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Links

Git

Maintainers

s8njees8njee

Keywords

chartsplotlydata-visualizationfigureschemavalidationcolorscales

Readme

@mk7s/holochart-core

The figure model of Holochart: the attribute schema system, validation, defaults, templates, named colors, scales and update planning. Pure and renderer-free (it never imports three.js). Part of Holochart, declarative GPU charts on three.js.

Alpha. Released as 0.1.0-alpha on the npm alpha tag; APIs can change between 0.x releases. Most apps should install the full bundle, @mk7s/holochart, which includes this package.

Install

pnpm add @mk7s/holochart-core@alpha

No peer dependencies. ESM-only; Node 22 and newer can also require() it.

What it exports

  • Schema and validation: attr, layoutSchema, configSchema, plotSchema, validate, ValidationError, HolochartError
  • Defaults and templates: createRegistry, supplyDefaults, composeTemplates, resolveTemplate, and the built-in holochartTemplate, plotlyClassicTemplate, noneTemplate
  • Subplots: makeSubplots
  • Colors: colors, getColorscale, getColorway, registerColorscale, registerBuiltinColors (opts a partial bundle in to every named palette and colorscale)
  • Updates and data: planUpdate, planRestyle, planRelayout, diffFigures, parseDate (experimental), encodeFigure / decodeFigure

attr, the schema objects and createRegistry are experimental until the plugin API stabilises. The package also exports helpers for the other Holochart packages (scales, coercion, rich text), tagged @internal: they are not API.

Usage

import { makeSubplots, registerBuiltinColors } from '@mk7s/holochart-core';

registerBuiltinColors(); // makes names like 'tempo' or 'Safe' resolvable in a partial bundle

const sp = makeSubplots({ rows: 1, cols: 2, subplotTitles: ['Sales', 'Costs'] });
const figure = {
  data: [sp.place({ type: 'bar', x: ['a', 'b'], y: [2, 3] }, 1, 1)],
  layout: { ...sp.layout },
};

Docs

License

MIT (see LICENSE). The named palettes and colorscales include data from plotly.py, ColorBrewer (Apache-2.0), CARTOColors (CC BY 3.0), cmocean and matplotlib; their licenses are listed in THIRD_PARTY_NOTICES.md.