Create Colour Scales and Legend from Continuous or Categorical Vectors.
paletteknife
The goal of paletteknife is to make assigning colour scales, adding legends, and adjusting axes a more effortless task when using R base graphics.
The principal functions included are:
autocol()
- creates a colour vector from a continuous or categorical vectorautolegend()
- draws a legend with the lastautocol()
scalesautoaxis()
- adds more axes labels and gridlinesautopal()
- creates a colour palette between limits
Extensive examples have been included, see ?autocol
and ?autolegend
for starters. Functions themselves are relatively simple but serve as shortcuts so that adding a colour scale and legend can be done in-line and interactively, contributing to a smoother worflow.
For deployment, the underlying base functions can be extracted and embedded if minimal dependencies are required. With that aim, viridisLite
and RColorBrewer
palettes are included so that these tools are as portable as possible.
Suggestions and contributions are very welcome for further base graphics tasks which can be helpfully streamlined. See maintainer contact details and repository.
Installation
You can install the released version of paletteknife from CRAN with:
install.packages('paletteknife')
Example
This is a basic example which shows you how to solve a common problem:
library(paletteknife)
pals_display(pals = pals.rcolorbrewer)
aq_dates = seq(as.Date('1973-05-01'), by=1, length.out=nrow(airquality))
with(airquality, plot(aq_dates, Temp, pch=16, cex=Solar.R/100, col=autocol(Ozone, set='Reds'),
xaxt='n', xlab='', main='New York Air Quality'))
autoaxis(side=1, major='week', major_grid=TRUE, minor='day', las=2, format='%d %b')
autoaxis(side=2, minor=1, minor_grid=TRUE)
autolegend(ncol=5, title='Size: Solar, Colour: Ozone') # Click on plot