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authorJohannes Ranke <jranke@uni-bremen.de>2017-06-13 16:05:39 +0200
committerJohannes Ranke <jranke@uni-bremen.de>2017-06-13 16:05:39 +0200
commit3f82707cd1e974848185b1141c69734e2573594d (patch)
tree42b968e860f8748280d2d217a1b24831f9d06970 /R/chent.R
parentf5b36dc73e7778091a08eaed51fd9d4f8677fbc1 (diff)
Make grConvert optional as it vanished on Windows
Diffstat (limited to 'R/chent.R')
-rw-r--r--R/chent.R36
1 files changed, 20 insertions, 16 deletions
diff --git a/R/chent.R b/R/chent.R
index 192c6df..3e89e14 100644
--- a/R/chent.R
+++ b/R/chent.R
@@ -191,22 +191,26 @@ chent <- R6Class("chent",
PythonInR::pyExec("d2d.DrawMolecule(mol)")
PythonInR::pyExec("d2d.FinishDrawing()")
self$svg <- PythonInR::pyGet("d2d.GetDrawingText()")
- svgfile <- tempfile(fileext = ".svg")
- writeLines(self$svg, svgfile)
-
- # Convert to PostScript, remembering size properties
- psfile <- tempfile(fileext = ".ps")
- suppressMessages(grConvert::convertPicture(svgfile, psfile))
- ps_font_line <- grep("Tm$", readLines(psfile), value = TRUE)[1]
- ps_font_size <- gsub(" .*$", "", ps_font_line)
- self$Pict_font_size = as.numeric(ps_font_size)
-
- # Read in to create Picture
- xmlfile <- tempfile(fileext = ".xml")
- PostScriptTrace(psfile, outfilename = xmlfile)
- unlink(paste0("capture", basename(psfile)))
- self$Picture <- readPicture(xmlfile)
- unlink(c(xmlfile, psfile, svgfile))
+
+ if (!requireNamespace("grConvert")) {
+ stop("grConvert is not available, self$Picture will not be created")
+ } else {
+ # Convert to PostScript, remembering size properties
+ svgfile <- tempfile(fileext = ".svg")
+ writeLines(self$svg, svgfile)
+ psfile <- tempfile(fileext = ".ps")
+ suppressMessages(grConvert::convertPicture(svgfile, psfile))
+ ps_font_line <- grep("Tm$", readLines(psfile), value = TRUE)[1]
+ ps_font_size <- gsub(" .*$", "", ps_font_line)
+ self$Pict_font_size = as.numeric(ps_font_size)
+
+ # Read in to create Picture
+ xmlfile <- tempfile(fileext = ".xml")
+ PostScriptTrace(psfile, outfilename = xmlfile)
+ unlink(paste0("capture", basename(psfile)))
+ self$Picture <- readPicture(xmlfile)
+ unlink(c(xmlfile, psfile, svgfile))
+ }
}
},
get_chyaml = function(repo = c("wd", "local", "web"),

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