r - googleVis: Colors with alpha < 1 -

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i trying use colors alpha < 1 in googlevis chart without success.

my initial color list applied is: 

mycolors <- c('#dd4477', '#109618', '#aaaa11)

then apply function adjustcolor: myalphacolors <- adjustcolor(mycolors, 0.4)

if try use these colors in googlevis chart error: #109618e6 not valid color string

how overcome problem , use colors alpha < 1 in googlevis charts?

here reproducible example (in particular case don't error message second series colors not plotted properly):

library(googlevis) mycolors <- c('#dd4477', '#109618', '#aaaa11')  df <- data.frame(country=c("us", "gb", "br"), val1=c(10,13,14), val1.style = mycolors, val2=c(23,12,32), val2.style = adjustcolor(mycolors, 0.4))  plot(gviscolumnchart(df, xvar="country", yvar=c(colnames(df)[2], colnames(df)[3], colnames(df)[4], colnames(df)[5]),                      options=list(legend="none",                                   chartarea = "{left:'10%',top:'10%',width:'80%',height:'70%'}",                                   height=750,                                   width=1050,                                   backgroundcolor = "white")                      )     )


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