hjust_red_end: Anchor glycan cartoons at their reducing ends

In glydraw: Draw Beautiful Symbol Nomenclature for Glycans

Anchor glycan cartoons at their reducing ends

Description

These helpers align the reducing end of every glycan cartoon with its anchor in geom_glycan(), scale_x_glycan(), scale_y_glycan(), or guide_glycan(). Use hjust_red_end() for horizontal alignment when orient = "V", and use vjust_red_end() for vertical alignment when orient = "H". Because the required justification is calculated separately from each cartoon's rendered bounds, the helpers also work for collections of glycans with different asymmetric branches. Glycan scales and guides use reducing-end justification by default along the axis perpendicular to the drawing orientation; geom_glycan() remains centered by default.

Usage

hjust_red_end()

vjust_red_end()

Value

A reducing-end justification marker accepted by the glycan layer, scales, and guide.

Examples

glycan <- data.frame(
  x = 0,
  y = 0,
  structure = "Man(a1-3)[Man(a1-6)]Man(b1-4)GlcNAc(b1-"
)

ggplot2::ggplot(
  glycan,
  ggplot2::aes(x = .data$x, y = .data$y, structure = .data$structure)
) +
  geom_glycan(orient = "V", hjust = hjust_red_end())

ggplot2::ggplot(
  glycan,
  ggplot2::aes(x = .data$x, y = .data$y, structure = .data$structure)
) +
  geom_glycan(orient = "H", vjust = vjust_red_end())

glydraw documentation built on July 25, 2026, 9:06 a.m.