ggnewscale

Multiple Fill, Color and Other Scales in `ggplot2`

https://github.com/eliocamp/ggnewscale

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Multiple Fill, Color and Other Scales in `ggplot2`

README.Rmd

---
output: github_document
knit: (function(input, ...) devtools::build_readme())
---


```{r setup, include = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.path = "man/figures/README-"
)
```
# ggnewscale 
 


[![R build
status](https://github.com/eliocamp/ggnewscale/workflows/R-CMD-check/badge.svg)](https://github.com/eliocamp/ggnewscale/actions)
[![Codecov test
coverage](https://codecov.io/gh/eliocamp/ggnewscale/branch/master/graph/badge.svg)](https://app.codecov.io/gh/eliocamp/ggnewscale?branch=master)
[![DOI](https://zenodo.org/badge/161934647.svg)](https://zenodo.org/badge/latestdoi/161934647)
[![CRAN
status](http://www.r-pkg.org/badges/version/ggnewscale)](https://cran.r-project.org/package=ggnewscale)
[![R-CMD-check](https://github.com/eliocamp/ggnewscale/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/eliocamp/ggnewscale/actions/workflows/R-CMD-check.yaml)


`ggnewscale` tries to make it painless to use multiple scales in `ggplot2`. Although originally intended to use with colour and fill, it should work with any `aes`, such as `shape`, `linetype` and the rest.

[ggnewscale: spend 400% more time tweaking your ggplot!](https://web.archive.org/web/20220511154749/https://twitter.com/mattansb/status/1524415881920528385)

For another way of defining multiple scales, you can also try [relayer](https://github.com/clauswilke/relayer).

## How to install

You can install ggnewscale from CRAN with:

```{r CRAN-installation, eval = FALSE}
install.packages("ggnewscale")
```

Or the development version with:

```r
# install.packages("devtools")
devtools::install_github("eliocamp/ggnewscale")
```

## How to cite

If you use ggnewscale in a publication, I'll be grateful if you cited it. To get the suggested citation for this (and any other R package) you can use:

```{r}
citation("ggnewscale")
```

If you use knitr, [you can automate this](https://bookdown.org/yihui/rmarkdown-cookbook/write-bib.html) with

```r
knitr::write_bib(c("ggnewscale"), "packages.bib")
```

And then add citations with `@R-ggnewscale`.



 
Click to see a list of some publications that have cited ggnewscale. Thanks!

```{r echo=FALSE, message=FALSE, warning=FALSE, results='asis'}
bib <- "ggnewscale-cited.bib"

RefManageR::ReadBib(bib)
```


## Usage

The main function is `new_scale()` and its aliases `new_scale_color()` and `new_scale_fill()`. When added to a plot, every geom added after them will use a different scale.

As an example, let's overlay some measurements over a contour map of topography using the beloved `volcano`. 

```{r}
library(ggplot2)
library(ggnewscale)
# Equivalent to melt(volcano)
topography <- expand.grid(x = 1:nrow(volcano),
                          y = 1:ncol(volcano))
topography$z <- c(volcano)

# point measurements of something at a few locations
set.seed(42)
measurements <- data.frame(x = runif(30, 1, 80),
                           y = runif(30, 1, 60),
                           thing = rnorm(30))

ggplot(mapping = aes(x, y)) +
  geom_contour(data = topography, aes(z = z, color = stat(level))) +
  # Color scale for topography
  scale_color_viridis_c(option = "D") +
  # geoms below will use another color scale
  new_scale_color() +
  geom_point(data = measurements, size = 3, aes(color = thing)) +
  # Color scale applied to geoms added after new_scale_color()
  scale_color_viridis_c(option = "A")
```


If you want to create new scales for other `aes`, you can call `new_scale` with the name of the `aes`. For example, use 

```{r, eval = FALSE}
new_scale("linetype")
```

to add multiple linetype scales. 

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