Zoom / highlight polygon between two tracks

Projects a genomic region onto two tracks and connects the two projections with a filled quadrilateral. Typically used to link an overview track to a zoomed detail track (e.g. ideogram → locus). Always used as a plot-level link — t0 and t1 must be specified explicitly.

Usage

seq_zoom(
  data = NULL,
  mapping = NULL,
  t0 = NULL,
  t1 = NULL,
  aesthetics = aes(),
  ...
)

Arguments

data: Optional GRanges or data.frame.
mapping: Optional map().
t0, t1: Track identifiers (required).
aesthetics: Optional aes(): fill (default "grey50"), alpha (default 0.15), color (border; default NA), linewidth (default 0.5), stemOffset (default 0.01).
...: Reserved.

Value

A SeqZoomR6 instance.

Details

Map vocabulary:

x0, x0_end: required — genomic edges of the region in t0.
x1, x1_end: optional — genomic edges of the region in t1; default to x0, x0_end (same region projected onto both tracks).
chrom0, chrom1: optional for GRanges (default seqnames(data)); required for data.frame.

Attachment edges auto-select so that the upper track attaches from its bottom and the lower track from its top.