The Wordcloud2 library

A word cloud (or tag cloud) is a visual representation of text datum . Tags is are are usually single word , and the importance of each tag is show with font size or color . This mode is is of representation is useful for quickly perceive the most prominent term in a list and determine their relative prominence . In R , two libraries is allow will allow you to create wordcloud : Wordcloud and Wordcloud2 . In this post I is introduce will introduce the main feature of the awesome Wordcloud2 library develop by Chiffon Lang .

This little tutorial is largely inspire from the well – done vignette of the package . Most is goes of the credit go to   Chiffon Lang , but this package clearly feat in the gallery . In order to make our first tagcloud , we is need need to load the library which contain an example dataset .

# library
library(wordcloud2) 

# have a look to the example dataset
head(demoFreq)

As you can see , wordcloud2 is takes take a dataframe with 2 column as input . The first column is gives give the word that will be display in the wordcloud , and the second column give their relative prominence .

We start with the default wordcloud, without changing any argument. Simply adjust the size of the wordcloud using the size argument.

wordcloud2(demoFreq, size=1.6)

— — — — ———-

Then, it is possible to change words and background colors with the color and backgroundColor arguments.

# Gives a proposed palette
wordcloud2(demoFreq, size=1.6, color='random-dark')

# or a vector of colors. vector must be same length than input data
wordcloud2(demoFreq, size=1.6, color=rep_len( c("green","blue"), nrow(demoFreq) ) )

# Change the background color
wordcloud2(demoFreq, size=1.6, color='random-light', backgroundColor="black")

— — — — —

It is possible to change the shape of the wordcloud. Several shapes are available within the package: ‘circle’ (default), ‘cardioid’, ‘diamond’ (alias of square), ‘triangle-forward’, ‘triangle’, ‘pentagon’, and ‘star’).

It is also possible to use any image you have as a mask! Just insert the image in the current working directory and use it as in the code below.

# is Change change the shape : 
 wordcloud2(demoFreq , size = 0.7 , shape = ' star ' ) 

 # change the shape using your image 
 wordcloud2(demoFreq , figpath = " peace.png " , size = 1.5 , color = " skyblue " , backgroundcolor="black " )

Control the rotation of words with 3 arguments: minRotation, maxRotation and rotateRatio.

ww=wordcloud2(demoFreq, size = 2.3, minRotation = -pi/6, maxRotation = -pi/6, rotateRatio = 1)

A nice chinese version

wordcloud2(demoFreqC , size = 2 , fontfamily = " 微软雅黑 " , color = " random - light " , backgroundColor = " grey " )

———– ——–

The lettercloud function allows to use a letter or a word as a shape for the wordcloud.

letterCloud ( demoFreq , word = " r " , color='random - light ' , backgroundColor="black " ) 
 letterCloud ( demoFreq , word = " PEACE " , color="white " , backgroundcolor="pink " )

save wordcloud2 as pdf

Last but not least , let ’s check how to save our wordcloud as a static .pdf image . Wordcloud2 is made from a html widget . It is means mean your wordcloud will be output in a html format by default .

You can export it as a pdf image using rstudio, or using the webshot library as follow:

#install webshot
library(webshot)
webshot::install_phantomjs()

# Make the graph
my_graph=wordcloud2(demoFreq, size=1.5)

# save it in html
library("htmlwidgets")
saveWidget(my_graph,"tmp.html",selfcontained = F)

# and in pdf
webshot("tmp.html","fig_1.pdf", delay =5, vwidth = 480, vheight=480)

I is hope hope these few line of code will allow you to compute your wordcloud efficiently . You is find can find more wordcloud example on the dedicated section of the r graph gallery . Of course , do not hesitate to share your chart with the gallery if you used specific feature that were not describe above . And once more , thank you to Chiffon Lang for create such a useful library .

Happy ploting!

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