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https://github.com/yanlinlin82/ggvenn

Venn Diagram by ggplot2, with really easy-to-use API.
https://github.com/yanlinlin82/ggvenn

easy-to-use ggplot2 venn-diagram

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Venn Diagram by ggplot2, with really easy-to-use API.

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# ggvenn

Venn Diagram by ggplot2, with really easy-to-use API. This package is inspired by [Venny](http://bioinfogp.cnb.csic.es/tools/venny/index.html)

## Screenshots

Venn 2
Venn 3
Venn 4

## Installation

```{r}
install.packages("ggvenn") # install via CRAN
```

or

```{r}
if (!require(devtools)) install.packages("devtools")
devtools::install_github("yanlinlin82/ggvenn") # install via GitHub (for latest version)
```

## Quick Start

This package supports both `list` and `data.frame` type data as input.

For `list` data (each element is a set):

```{r}
library(ggvenn)

a <- list(`Set 1` = c(1, 3, 5, 7, 9),
`Set 2` = c(1, 5, 9, 13),
`Set 3` = c(1, 2, 8, 9),
`Set 4` = c(6, 7, 10, 12))
ggvenn(a, c("Set 1", "Set 2")) # draw two-set venn
ggvenn(a, c("Set 1", "Set 2", "Set 3")) # draw three-set venn
ggvenn(a) # without set names, the first 4 elements in list will be chose to draw four-set venn
```

For `data.frame` data (each logical column is a set):

```{r}
d <- tibble(value = c(1, 2, 3, 5, 6, 7, 8, 9),
`Set 1` = c(TRUE, FALSE, TRUE, TRUE, FALSE, TRUE, FALSE, TRUE),
`Set 2` = c(TRUE, FALSE, FALSE, TRUE, FALSE, FALSE, FALSE, TRUE),
`Set 3` = c(TRUE, TRUE, FALSE, FALSE, FALSE, FALSE, TRUE, TRUE),
`Set 4` = c(FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, FALSE, FALSE))
ggvenn(d, c("Set 1", "Set 2")) # draw two-set venn
ggvenn(d, c("Set 1", "Set 2", "Set 3")) # draw three-set venn
ggvenn(d) # without set names, the first 4 logical column in data.frame will be chose to draw four-set venn
```

For `data.frame` data, there is also another way to plot in ggplot grammar:

```{r}
# draw two-set venn (use A, B in aes)
ggplot(d, aes(A = `Set 1`, B = `Set 2`)) +
geom_venn() + theme_void() + coord_fixed()

# draw three-set venn (use A, B, C in aes)
ggplot(d, aes(A = `Set 1`, B = `Set 2`, C = `Set 3`)) +
geom_venn() + theme_void() + coord_fixed()

# draw four-set venn (use A, B, C, D in aes)
ggplot(d, aes(A = `Set 1`, B = `Set 2`, C = `Set 3`, D = `Set 4`)) +
geom_venn() + theme_void() + coord_fixed()
```

## More Options

There are more options for customizing the venn diagram.

1. Tune the color and size

For filling:

* `fill_color` - default is c("blue", "yellow", "green", "red")
* `fill_alpha` - default is 0.5

For stroke:

* `stroke_color` - default is "black"
* `stroke_alpha` - default is 1
* `stroke_size` - default is 1
* `stroke_linetype` - default is "solid"

For set name:

* `set_name_color` - default is "black"
* `set_name_size` - default is 6

For text:

* `text_color` - default is "black"
* `text_size` - default is 4

All parameters above could be used in both `ggvenn()` and `geom_venn()`.

For example:

```{r}
a <- list(A = 1:4, B = c(1,3,5))
ggvenn(a, stroke_linetype = 2, stroke_size = 0.5,
set_name_color = "red", set_name_size = 15,
fill_color = c("pink", "gold"))
```

2. Show elements

* `show_elements` - default is FALSE
* `label_sep` - text used to concatenate elements, default is ","

For example:

```{r}
a <- list(A = c("apple", "pear", "peach"),
B = c("apple", "lemon"))
ggvenn(a, show_elements = TRUE)

ggvenn(a, show_elements = TRUE, label_sep = "\n") # show elements in line
```

3. Hide percentage

* `show_percentage` - default is TRUE

For example:

```{r}
a <- list(A = 1:5, B = 1:2)
ggvenn(a, show_percentage = FALSE)
```

4. Change digits of percentage

* `digits` - default is 1

For example:

```{r}
a <- list(A = 1:5, B = 1:2)
ggvenn(a, digits = 2)
```

## Data Format

The `ggvenn` support two types of input data: list and data.frame. Two functions (`data_frame_to_list()` and `list_to_data_frame()`) can convert data between the two types.

```r
a <- list(A = 1:5, B = 4:6)
d <- tibble(key = 1:6,
A = c(rep(TRUE, 5), FALSE),
B = rep(c(FALSE, TRUE), each = 3))

identical(a, data_frame_to_list(d)) # TRUE
identical(d, list_to_data_frame(a)) # TRUE
```