ggsvelte
GitHub
Navigate
On this page

ScaleAlphaOrdinal

Discrete alpha scale for categories (ordinal). ggplot2 *Ordinal alias — same binding as ScaleAlphaDiscrete.

Defaults

helper
scaleAlphaOrdinal
family
numeric-style
aesthetic
alpha
scale type
ordinal
options type
DiscreteNumericStyleScaleOptions

Alias

This component re-exports ScaleAlphaDiscrete (same binding). Prefer the canonical spelling in new code.

Svelte component

import { GGPlot, GeomPoint, ScaleAlphaOrdinal } from "@ggsvelte/svelte";

<GGPlot data={rows} aes={{ x: "x", y: "y", alpha: "weight" }}>
  <ScaleAlphaOrdinal />
  <GeomPoint />
</GGPlot>

JSON scales

{
  "scales": {
    "alpha": {
      "type": "ordinal"
    }
  }
}

Params

domain

Array<DomainValue>

Explicit semantic domain. Continuous scales use [min, max]; ordinal uses ordered values.

domainMode

"grow" | "data"

Ordinal domain stability: "grow" (default) preserves assignments across filters; "data" rebuilds from current data.

range

Array<number>

Explicit output range for the mapped aesthetic.

reverse

boolean

Reverse the scale's output direction. Default false.

naValue

number

Replacement for missing/null source values.

unknownValue

number

Replacement for invalid, out-of-domain, or unmapped values.

onExhaust

"cycle" | "error"

Ordinal palette exhaustion policy: "cycle" (default) with a warning, or "error".

guide

GuideSpec

Guide presentation override (legend, colorbar, colorsteps, or none).

Guide interaction

Legend guide for the mapped style channel. Set guide: "none" to hide.

Examples

← All scales · Palettes · Scales and guides

Docs