âPlotToolsâ is an R package that allows the legends for continuous variables to be added to plots using the familiar functions of the default âgraphicsâ package. It also includes utility functions to manipulate irregular polygons and locate their centres.
install.packages("PlotTools")devtools::install_github("ms609/PlotTools")# 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"
)Smith, Martin R. (2023). PlotTools: Add continuous legends to plots. Comprehensive R Archive Network, doi:10.5281/zenodo.7803390.
Please note that the âPlotToolsâ project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.
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