true type fonts - r wordcloud external ttf vfont not recognized -

i've installed 'extrafont' package in order install external font library duality via ttf_import() method. however, when specifying font via wordcloud method, receive following error:

installation command:

# assuming font file, duality_.ttf, in working directory (see link font above) font_import(".",false,pattern="duality") 

wordcloud command:

wordcloud(ap.d$word, ap.d$freq, scale=c(8,2), min.freq=10, vfont=c("duality","plain"),       random.order=false, rot.per=0, use.r.layout=false, colors=pal2, fixed.asp=false) 

output:

error in strwidth(words[i], cex = size[i], ...) :    invalid 'vfont' value [typeface -2147483648] 

in order verify font indeed installed, issued following commands

> choose_font("duality") [1] "duality" > fonts() ....[49] "waree"                    "duality"     

how come duality font not visible vfont parameter of wordcloud? , how make visible cairo (the default renderer). tia!

i've been able overcome same problem using parameters passed text family , font , described in ?par instead of vfont. needed load font first. thing goes:

import font (sorry, link duality provided in op no longer available, use lucida handwriting instead, available in windows):

library(extrafont) font_import(pattern="lhandw") 

load (see blog details):

loadfonts() # loadfonts(device = "win") if working in windows 

wordcloud:

wordcloud(ap.d$word, ap.d$freq, scale=c(8,2), min.freq=10, family="lucida handwriting", font=1,   random.order=false, rot.per=0, use.r.layout=false, colors=pal2, fixed.asp=false)