CODEWITHSUNDEEP
rgraphicsdrawingplotmathgrob
andrewH
andrewH

Reputation: 2321

R: Drawing a textGrob fails with mysterious error

I have four different kinds of graphic, each converted to a grob with apparent success. I am trying to combine them into a single image with grid.arrange(). One of the four -- I would say the simplest of the four -- produces an error, even without the other three. 

grid.text(expression(atop("first line", 
                            scriptstyle("second line"))),
            vjust = 0, gp=gpar(fontfamily = "HersheySans"))

Error in grid.Call.graphics(L_text, as.graphicsAnnot(x$label), x$x, x$y,  : 
  Metric information not available for this family/device

This is the traceback()

8: grid.Call.graphics(L_text, as.graphicsAnnot(x$label), x$x, x$y, 
       resolveHJust(x$just, x$hjust), resolveVJust(x$just, x$vjust), 
       x$rot, x$check.overlap)
7: drawDetails.text(x, recording = FALSE)
6: drawDetails(x, recording = FALSE)
5: drawGrob(x)
4: recordGraphics(drawGrob(x), list(x = x), getNamespace("grid"))
3: grid.draw.grob(tg)
2: grid.draw(tg)
1: grid.text(expression(atop("first line", scriptstyle("second line"))), 
       vjust = 0, gp = gpar(fontfamily = "HersheySans"))

I get the same error if I remove scriptstyle and vjust from the function, so they aren't the culprits.

I can't even figure out what function the error comes from. grid.Call.graphics isn't exported, but grid:::grid.Call.graphics does not have an error message like that in it's code, and neither do as.graphicsAnnot, resolveHJust, or resolveVJust.

I've hit the wall on this one. Any ideas or suggestions how to resolve this or get around it much appreciated.

All done under Windows 7.

Upvotes: 1

Views: 571

Answers (1)

baptiste
baptiste

Reputation: 77116

From ?Hershey,

You cannot use mathematical expressions (plotmath) with Hershey fonts.

which means that Hershey fonts are incompatible with anything listed in ?plotmath, such as scriptstyle, atop, and of course expression.

Upvotes: 2

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