getMidpoints: Compute midpoints across grouped coordinates

In ggpedigree: Visualizing Pedigrees with 'ggplot2' and 'plotly'

Compute midpoints across grouped coordinates

Description

A flexible utility function to compute x and y midpoints for groups of individuals using a specified method. Used to support positioning logic for sibling groups, parental dyads, or spousal pairs in pedigree layouts.

Usage

getMidpoints(
  data,
  group_vars,
  x_vars,
  y_vars,
  x_out,
  y_out,
  method = "mean",
  require_non_missing = group_vars
)

Arguments

data	A 'data.frame' containing the coordinate and grouping variables.
group_vars	Character vector. Names of the grouping variables.
x_vars	Character vector. Names of the x-coordinate variables to be averaged.
y_vars	Character vector. Names of the y-coordinate variables to be averaged.
x_out	Character. Name of the output column for the x-coordinate midpoint.
y_out	Character. Name of the output column for the y-coordinate midpoint.
method	Character. Method for calculating midpoints. Options include: '"mean"': Arithmetic mean of the coordinates. '"median"': Median of the coordinates. '"weighted_mean"': Weighted mean of the coordinates. '"first_pair"': Mean of the first pair of coordinates. '"meanxfirst"': Mean of the x-coordinates and first y-coordinate. '"meanyfirst"': Mean of the y-coordinates and first x-coordinate.
require_non_missing	Character vector. Names of variables that must not be missing for the row to be included.

Value

A 'data.frame' grouped by 'group_vars' with new columns 'x_out' and 'y_out' containing midpoint coordinates.

ggpedigree documentation built on Sept. 13, 2025, 1:08 a.m.