Filter Breaks for X-Axis — filter

Filters an axis for consecutive breaks that are far enough apart to be drawn without their labels colliding. A break is kept when its distance from the last kept break is at least min_cm_distance and at least the space the two labels occupy along the axis, so a wide label such as 119.917 thins the axis further than a short one such as 12 does.

Usage

filter_breaks(
  breaks = NA,
  plot = plot,
  min_cm_distance = 0.5,
  axis = "x",
  labels = format_axis_labels
)

Arguments

breaks: A numeric vector of x-axis breaks.
plot: A ggplot object used to extract plot dimensions and scales.
min_cm_distance: A numeric of the minimum distance between breaks.
axis: Axis to filter on, either "x" or "y".
labels: A function turning breaks into the labels that will be drawn, used to measure how much room each one needs. Defaults to the same labels the concentration plots draw.

Value

A numeric vector of filtered x-axis breaks.

Details

Candidates outside the plotted range are dropped before any of that, so a break that is never drawn cannot decide which of the visible ones survive.

Author

Gerardo Rodriguez