Cannot apply tikz to a ggplot

[stla]

Hello,

I guarantee the code below worked before (a couple of years ago). No it doesn't work. tikzDevice cannot compute \char77. Same problem with another ggplot, and this is not due to the LaTeX code included in the graphic.

library(tikzDevice)
plot2tikz <- function(code, filename="Rplot", outdir=getwd(),
                      overwrite=FALSE, format="pdf", lua=FALSE,
                      packages=NULL, addDefaultTikZoptions=TRUE,
                      compile=TRUE, clean=FALSE, ...){
  format <- match.arg(format, choices = c("pdf", "ps", "eps"))
  texfile <- paste0(filename, ".tex")
  owd <- setwd(outdir); on.exit(setwd(owd))
  if(overwrite || !file.exists(texfile)){
    if(is.null(packages)){
      if(format=="pdf") packages <- getOption("tikzLatexPackages")
      if(format %in% c("ps", "eps")) packages <- c("\\thispagestyle{empty}\n", "\\usepackage{tikz}\n")
    } else {
      if(!"\\usepackage{tikz}\n" %in% packages){
        packages <- c("\\usepackage{tikz}\n", packages)
        if(format=="pdf" && addDefaultTikZoptions){
          packages <- union(packages, getOption("tikzLatexPackages"))
        }
      }
    }
    tikz(texfile, standAlone=TRUE, onefile=FALSE, packages=packages, ...)
    code()
    grDevices::dev.off()
  }
  if(compile || format=="eps"){
    message("Compilation...")
    if(format=="pdf"){
      # pdf compilation
      pdffile <- stringr::str_replace(texfile, ".tex", ".pdf")
      if(overwrite || !file.exists(pdffile)){
        if(lua){
          command <- sprintf("lualatex %s", texfile)
          system(command)
        }else{
          tools::texi2dvi(texfile, pdf=TRUE, clean=clean)
        }
        message(sprintf("Output pdf file: %s.pdf", filename))
      }
    } else if(format %in% c("ps", "eps")){
      psfile <- stringr::str_replace(texfile, ".tex", ".ps")
      if(overwrite || !file.exists(psfile)){
        tools::texi2dvi(texfile, pdf=FALSE, clean=clean)
        command <- sprintf("dvips %s.dvi", filename)
        system(command)
        message(sprintf("Output ps file: %s.ps", filename))
        if(format=="eps"){
          command <- sprintf("ps2epsi %s.ps %s.epi", filename, filename)
          system(command)
          file.rename(sprintf("%s.epi", filename), sprintf("%s.eps", filename))
          message(sprintf("Output eps file: %s.eps", filename))
        }
      }
    }
  }
  #
  message(sprintf("Output tex file: %s", normalizePath(texfile, winslash=.Platform$file.sep)))
  return(invisible())
}


library(ggplot2)
plotCode <- function(){
  gg <- ggplot(mtcars, aes(wt, mpg)) + geom_point() + 
    annotate("text", x = 300, y = 46, label = "COI eDNA\n$\\lambda$ = -0.0546", 
             color = "black", hjust = 0.5, vjust = 1)
  print(gg)
}


plot2tikz(plotCode, compile=FALSE, outdir=getwd(), overwrite = TRUE,
          packages=c("\\usepackage[active,tightpage,psfixbb]{preview}\n",
                     "\\PreviewEnvironment{pgfpicture}\n",
                     "\\setlength\\PreviewBorder{10pt}\n",
                     "\\usepackage{amssymb}\n"),
          documentDeclaration ="\\documentclass[12pt]{standalone}\n",
          width=7, height=5)

[stla]

It works! I had to remove some packages (maybe `preview´).