‘PlotTools’ is an R package that allows the legends for continuous variables to be added to plots using the familiar functions of the default ‘graphics’ package. It also includes utility functions to manipulate irregular polygons and locate their centres.
Install the latest production version from CRAN using
or install the development version from GitHub with
Please let me know of any feature requests or bugs by opening an issue on GitHub.
# Select a colour palette palette <- if (packageVersion("grDevices") > 3.6) hcl.colors else heat.colors # Plot some example data plot( cars, xlab = "Speed / mph", ylab = "Stopping distance / ft", col = palette(125 + 1)[cars$dist + 1], # Colour points by distance cex = cars$speed / 10, # Size points by speed pch = 16, # Use filled circle for points frame.plot = FALSE ) # Display legend for colour scale PlotTools::SpectrumLegend( "topleft", # Legend position palette = palette, # Display our chosen palette legend = seq(125, 0, length.out = 6), # Annotate positions on legend title = "Distance", bty = "n" # Don't frame with box ) # Display legend for plotting symbol sizes PlotTools::SizeLegend( "bottomright", # Legend position palette = "darkgrey", # Set colour - may be continuous horiz = TRUE, # Orient horizontally width = c(0, 2.5), scale = "pch", # Scale for plotting character legend = seq(0, 25, by = 5), # Annotate positions on legend x.intersp = 0, # Set x spacing bty = "n", # Don't frame with box inset = 0.05, # Inset from plot edges title = "Speed" )
Cite this package as:
Smith, Martin R. (2023). PlotTools: Add continuous legends to plots. Comprehensive R Archive Network, doi:10.5281/zenodo.7803390.