This function creates a fill column for ggPedigree plots as a function of the focal person relative to everyone else in the tree.
createFillColumn(
ped,
focal_fill_personID = 2,
personID = "personID",
component = "additive",
config = list()
)
A data frame with two columns: `fill` and `personID`.
A data frame containing the pedigree data.
Numeric ID of the person to use as the focal point for fill.
Character string specifying the column name for individual IDs.
Character string specifying the component type (e.g., "additive").
A list of configuration options for customizing the fill column.