wordcloud2: Create Word Cloud by htmlWidget

title: "Wordcloud2 introduction" date: "2016-06-09" output: html_document: highlight: kate toc: true toc_depth: 4 mathjax: null vignette: > %\VignetteIndexEntry{Introduction} %\VignetteEngine{knitr::rmarkdown} \usepackage[utf8]{inputenc}

This is an introduction to wordcloud2 package. This package provides an HTML5 interface to wordcloud for data visualization. Timdream's wordcloud2.js is used in this package. png

This document show two main function in Wordcloud2:

wordcloud2: provide traditional wordcloud with HTML5
letterCloud: provide wordcloud with selected word(letters).

You may have installed this package. Well, I still want to leave these codes here for installing.

require(devtools)
install_github("lchiffon/wordcloud2")

`wordlcoud2` function

You can use wordcloud directly:

library(wordcloud2)
wordcloud2(data = demoFreq)

demoFreq is a data.frame including word and freq in each column.

head(demoFreq)

##          word freq
## oil       oil   85
## said     said   73
## prices prices   48
## opec     opec   42
## mln       mln   31
## the       the   26

data
A data frame including word and freq in each column
size
Font size, default is 1. The larger size means the bigger word.
fontFamily
Font to use.
fontWeight
Font weight to use, e.g. normal, bold or 600
color
color of the text, keyword 'random-dark' and 'random-light' can be used. color vector is also supported in this param
minSize
A character string of the subtitle
backgroundColor
Color of the background.
gridSize
Size of the grid in pixels for marking the availability of the canvas the larger the grid size, the bigger the gap between words.
minRotation
If the word should rotate, the minimum rotation (in rad) the text should rotate.
maxRotation
If the word should rotate, the maximum rotation (in rad) the text should rotate. Set the two value equal to keep all text in one angle.
rotateRatio
Probability for the word to rotate. Set the number to 1 to always rotate.
shape
The shape of the "cloud" to draw. Can be a keyword present. Available presents are 'circle' (default), 'cardioid' (apple or heart shape curve, the most known polar equation), 'diamond' (alias of square), 'triangle-forward', 'triangle', 'pentagon', and 'star'.
ellipticity
degree of "flatness" of the shape wordcloud2.js should draw.
figPath
A fig used for the wordcloud.
widgetsize
size of the widgets

Example1: use color and backgroundcolor

wordcloud2(demoFreq, color = "random-light", backgroundColor = "grey")

png

Example2: use rotations

wordcloud2(demoFreq, minRotation = -pi/6, maxRotation = -pi/6, minSize = 10,
  rotateRatio = 1)

Example3: use figure file as a mask.

For example, t.png is A BIRD with black and white: png

figPath = system.file("examples/t.png",package = "wordcloud2")
wordcloud2(demoFreq, figPath = figPath, size = 1.5,color = "skyblue")

png

`letterCloud` function

letterCloud provide the function to create a wordcloud with a word, like this:

letterCloud(demoFreq, word = "R", size = 2)

png

Or:

letterCloud(demoFreq, word = "WORDCLOUD2", wordSize = 1)

png wordcloud with fig and letterCloud may disappeared in Rstudio Viewer, open into brower when you meet this bug

Parameters

data
A data frame including word and freq in each column
word
A word to create shape for wordcloud.
wordSize
Parameter of the size of the word, default is 2.
letterFont
Letter font
...
Other parameters for wordcloud2 Go to wordcloud2 in the github to leave a comment or give this package a star.