make_alignment_dummies: Prepare dummy data to visually align a single gene across...

In YTLogos/gggenes: Draw Gene Arrow Maps in 'ggplot2'

Description

'make_alignment_dummies' helps you to visually align genes across molecules that have been faceted with a free x scale. The output of this function is a data frame of dummy genes. If these dummy genes are added to a 'ggplot2' plot with 'geom_blank', they will extend the x axis range in such a way that the start or end of a selected gene is visually aligned across the facets.

Usage

make_alignment_dummies(data, mapping, on, side = "left")

Arguments

data	Data frame of genes. This is almost certainly the same data frame that will later be passed to 'ggplot2::ggplot'.
mapping	Aesthetic mapping, created with 'ggplot2::aes'. Must contain the following aesthetics: 'xmin', 'xmax', 'y', and 'id' (a unique identifier for each gene).
on	Name of gene to be visually aligned across facets. This gene must be present in 'data', in the column mapped to the 'id' aesthetic.
side	Should the visual alignment be of the 'left' (default) or 'right' side of the gene?

Examples

dummies <- make_alignment_dummies(example_genes, ggplot2::aes(xmin = start,
  xmax = end, y = molecule, id = gene), on = "genE")

ggplot2::ggplot(example_genes, ggplot2::aes(xmin = start, xmax = end,
    y = molecule, fill = gene)) +
  geom_gene_arrow() +
  ggplot2::geom_blank(data = dummies) +
  ggplot2::facet_wrap(~ molecule, scales = "free", ncol = 1)

YTLogos/gggenes documentation built on May 19, 2019, 4:04 p.m.