ggtrace

ggtrace provides ggplot2 geoms that allow groups of data points to be highlighted with an outline for emphasis.

Installation

You can install the development version of ggtrace from GitHub with:

# install.packages("devtools")
devtools::install_github("rnabioco/ggtrace")

Basic Usage

geom_point_trace accepts graphical parameters normally passed to geom_point to control the appearance of data points and outlines. The trace_position argument can be used to select specific sets of points to highlight. For more examples see the vignette.

library(ggplot2)
library(ggtrace)

ggplot(clusters, aes(UMAP_1, UMAP_2, color = cluster)) + 
  theme_minimal() +
  geom_point_trace(
    trace_position    = signal < 0,
    fill              = "white",
    background_params = list(color = NA, fill = "grey85")
  )

geom_line_trace accepts parameters normally passed to geom_line with the following exceptions: fill controls the inner line color, color controls the outline color, and stroke controls the outline width. Like geom_point_trace(), the trace_position argument can be used to select specific data points to highlight. For more examples see the vignette.

ggplot(stocks, aes(day, value, color = name)) +
  theme_minimal() +
  geom_line_trace(
    trace_position    = day < 500 | day > 1500,
    stroke            = 1,
    background_params = list(color = NA, fill = "grey75")
  )