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一 安装wordcloud2包
install.packages("wordcloud2")，若下载失败，则打开翻墙软件，重新下载。
二 wordcloud2函数说明
在Rstudio的右边help中输入wordcloud2，搜索相关方法。
三 示例
1、星星图
library(wordcloud2)
wordcloud2(demoFreq, size = 1,shape = 'star')
2、中文
wordcloud2(demoFreqC, size = 2, fontFamily = "微软雅黑",color = "random-light", backgroundColor = "grey")
3、倾斜
wordcloud2(demoFreq, size = 2, minRotation = -pi/6, maxRotation = -pi/6, rotateRatio = 1)
4、自定义的文字云
letterCloud(demoFreqC,word = "姬", wordSize = 2, fontFamily = "微软雅黑",color = "random-light", backgroundColor = "grey")
5、自定义图片
batman = system.file("examples/picture.png",package = "wordcloud2")
wordcloud2(demoFreq, figPath = batman, size = 1,color = "black")