Generate axis breaks and labels for multi-chromosome plots

Calculates appropriate breaks and labels for x-axis when visualizing multiple chromosomes simultaneously. Adjusts break density based on chromosome length.

Usage

getBreaksLabels(data)

Arguments

data

A data frame or tibble with columns seqnames, start, and end representing genomic coordinates.

Value

A list with two elements:

• breaks: Numeric vector of x-axis break positions

• labels: Character vector of formatted labels

Details

The function:

1. Groups data by chromosome

2. Calculates chromosome lengths

3. Assigns more breaks to longer chromosomes (2-10 breaks per chromosome)

4. Formats labels in megabases (M)

5. Adds newlines before chromosome transitions for clarity

Useful for multi-chromosome Hi-C visualizations where chromosomes are displayed side-by-side.

Examples

if (FALSE) { # \dontrun{
# Get breaks and labels for multi-chromosome plot
df <- scaleData(cc, "balanced", log10)
breaks_labels <- getBreaksLabels(df)

ggplot(df) +
  geom_hic() +
  scale_x_continuous(
    breaks = breaks_labels$breaks,
    labels = breaks_labels$labels
  )
} # }