ggviolinbox: Half-Violin and Half-Boxplot Geoms for ggplot2

The ggviolinbox package extends ggplot2 by providing custom geoms for creating half-violin plots, half-boxplots, and combinations of both. These functions are useful for visualizing distributions and comparisons in a compact and elegant way.

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Installation

You can install the ggviolinbox package from GitHub using the devtools package:

if(!require(devtools)) install.packages("devtools")
devtools::install_github("dsmutin/ggviolinbox")

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Functions

The package provides the following functions:

1. geom_halfviolin(): Creates a half-violin plot (mirrored density plot).
2. geom_halfboxplot(): Creates a half-boxplot (mirrored boxplot).
3. geom_violinboxplot(): Combines a half-violin and a half-boxplot into a single plot.
4. ggviolinbox(): A convenience wrapper for geom_violinbox().

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Usage

1. geom_halfviolin()

Creates a half-violin plot. Use the panel parameter to specify which side to display.

library(ggplot2)
library(ggviolinbox)

ggplot(mpg, aes(class, hwy)) +
  geom_halfviolin(panel = "right") +
  theme_minimal()

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2. geom_halfboxplot()

Creates a half-boxplot. Use the panel parameter to specify which side to display.

ggplot(mpg, aes(class, hwy)) +
  geom_halfboxplot(panel = "left") +
  theme_minimal()

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3. geom_violinboxplot()

Combines a half-violin and a half-boxplot. Use the boxplot and violinplot parameters to specify which side each geom appears on.

ggplot(mpg, aes(class, hwy)) +
  geom_violinboxplot(boxplot = "left", violinplot = "right") +
  theme_minimal()

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4. ggviolinbox()

A convenience wrapper for geom_violinbox().

ggviolinbox(boxplot = "left", violinplot = "right") +
  theme_minimal()

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Examples

Example 1: Half-Violin Plot

ggplot(mpg, aes(class, hwy)) +
  geom_halfviolin(panel = "right", fill = "skyblue") +
  labs(title = "Half-Violin Plot", x = "Class", y = "Highway MPG") +
  theme_minimal()

Example 2: Half-Boxplot

ggplot(mpg, aes(class, hwy)) +
  geom_halfboxplot(panel = "left", fill = "lightgreen") +
  labs(title = "Half-Boxplot", x = "Class", y = "Highway MPG") +
  theme_minimal()

Example 3: Violin-Boxplot Combination

ggplot(mpg, aes(class, hwy)) +
  geom_violinboxplot(boxplot = "left", violinplot = "right", 
                 box_fill = "lightgreen", violin_fill = "skyblue") +
  labs(title = "Violin-Boxplot Combination", x = "Class", y = "Highway MPG") +
  theme_minimal()

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Parameters

geom_halfviolin()

• panel: Specifies which side to display ("left" or "right").
• All other parameters are inherited from ggplot2::geom_violin().

geom_halfboxplot()

• panel: Specifies which side to display ("left" or "right").
• All other parameters are inherited from ggplot2::geom_boxplot().

geom_violinboxplot()

• boxplot: Specifies which side the boxplot appears on ("left" or "right").
• violinplot: Specifies which side the violin plot appears on ("left" or "right").
• All other parameters are inherited from ggplot2::geom_violin() and ggplot2::geom_boxplot().

ggviolinbox()

• Same parameters as geom_violinboxplot().

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Contributing

Contributions are welcome! If you find a bug or have a feature request, please open an issue on GitHub. If you'd like to contribute code, fork the repository and submit a pull request.

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License

This package is licensed under the MIT License. See the LICENSE file for details.

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Acknowledgments

• Inspired by the ggridges, ggExtra and ggplot2 packages.
• Many thanks to the introindataviz package for previous implementations.

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Contact

For questions or feedback, please contact D. Smutin at dvsmutin@gmail.com.