wrapper function for plotting an x axis in its own viewport

wrapper function for plotting an x axis in its own viewport

bb_annoXaxis(
  plot,
  params = NULL,
  at = NULL,
  label = TRUE,
  main = TRUE,
  gp = gpar()
)

Arguments

plot	plot to add axis to
params	an optional "bb_params" object space containing relevant function parameters
at	a numeric vector of x-value locations for the tick marks
label	a logical value indicating whether to draw the labels on the tick marks, or an expression or character vector which specify the labels to use. If not logical, must be the same length as the at argument
main	A logical value indicating whether to draw the axis at the bottom (TRUE) or at the top (FALSE) of the plot