Add a vertical or horizontal line with an annotation

This is a utility function that allows the user to add a line threshold with text annotation using an intercept parameter. The shift parameter allows the user to relatively adjust the text with respect to the defined threshold value.

Usage

geom_threshold_annotate(intercept, axis = c("x", "y"), label = "", shift = 0)

Arguments

intercept

x or y intercept (indicated by axis) through which the vertical or horizontal threshold is made.

axis

Axis along which a threshold is to be added, defaults to "x" indicating a vertical threshold

label

Label to add to the graph, defaults to an empty string

shift

How much to shift the label in shift units above the threshold line along "y", or in shift units to the right of the threshold line along "x", defaults to 0

Examples

library(ggplot2)

ggplot(mtcars, aes(wt, mpg)) +
  geom_point() +
  geom_threshold_annotate(20, axis = "y", shift = 1, label = "20 mpg")