hd_geom_line: Line Geometry Layer for hd Objects

In highdir: Unified Data Visualization Framework for Dynamic and Static Graphics

Line Geometry Layer for hd Objects

Description

hd_geom_line() creates a line geometry layer that is added to an hd() object via +. The layer records the geometry type and any geometry-specific arguments; rendering only happens when the hd object is printed.

Usage

hd_geom_line(smooth = TRUE, dot_size = 4, line_symbols = NULL, ...)

Arguments

smooth	Logical. TRUE = spline curves, FALSE = straight segments. Both backends.
dot_size	Numeric. Marker radius in pixels. Both backends.
line_symbols	Character vector. Highcharter only. Per-group marker shapes: "circle", "square", "diamond", "triangle", "triangle-down".
...	Geometry-specific arguments forwarded to hd_make().

Value

An S3 object of class "hd_geom" for use with +.hd.

Examples

# Single series - no group column
spec_line1 <- hd_spec(alco1,
    x    = "year",
    y    = "adj_mean"
)

opts_line <- hd_opts(
    title = "Alcohol consumption over time",
    subtitle = "Source: Norwegian Directorate of Health",
    ylim = c(0, 50),
    ylab = "Litres per capita"
)


# Straight segments
hd_make(spec_line1, "line", opts_line, smooth = FALSE)

# Composite example with multiple geoms and custom line symbols
hd(alco2, x = "year", y = "adj_mean", group = "kjonn", backend = "static") +
  hd_geom_line(smooth = TRUE, dot_size = 3) +
  hd_opts(title = "Alcohol consumption over time by kjonn",
  subtitle = "Source: Norwegian Directorate of Health")

highdir documentation built on July 31, 2026, 5:06 p.m.