GeomHline

Horizontal reference-line alias. Canonicalized by normalize() to a rule layer. Annotation form: set params.yintercept. Data-driven form: map aes.y (inherited plot x is dropped so the one-axis rule contract holds).

Defaults

geom

hline

default stat

identity

default position

identity

params type

HlineParams

Alias

normalize() rewrites this geom to rule (with this alias's default stat and position). Prefer the canonical geom in new code.

Svelte component

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

<GGPlot data={rows}>
  <GeomHline />
</GGPlot>

JSON layer

{
  "geom": "hline"
}

Params

yintercept

RuleIntercept

ANNOTATION FORM ONLY: draw a horizontal rule at each of these fixed y positions. Mutually exclusive with mapping aes.y on this layer.

alpha

number

Rule opacity. Must be between 0 and 1 (inclusive). Default 1.

linewidth

number

Stroke width in px. Must be greater than 0. Default 1.

strokePaint

GradientPaint

Within-mark gradient stroke paint (not a data scale). Requires a solid fallback.

glow

GlowSpec

Bounded within-mark glow treatment (not theme decoration).

Allowed stats

• identity default

Allowed positions

• identity default

Examples

• Cavendish's readings against the modern value

← All geoms · Getting started