Compute breaks, labels, minor breaks, and axis_range for a scale

Given a scale (continuous / genomic / discrete) and the raw data range, returns a list with the full axis-drawing metadata: breaks, labels, minor_breaks, axis_range (where the axis line should span, governed by cap), plot_range (the expanded visible range), and data_range.

Usage

.compute_scale_breaks(scale, data_range, plot_range = NULL)

Arguments

scale

A SeqPositionScale.

data_range

Length-2 numeric vector of the unexpanded data range. For genomic scales, this is the window range.

plot_range

Optional pre-expanded plot range. When NULL (default), computed from data_range via .expand_limits() using scale$expand.

Value

A list with breaks, labels, minor_breaks, axis_range, plot_range, data_range.

Details

Algorithm ported from THEfunc's make_axis_meta(); uses base pretty() instead of scales::pretty_breaks() so no new dependency is introduced.