[R] Adding text to both grid and base graphs

[Rik Schoemaker]

Dear Richie,

Unfortunately that doesn't help because it requires you to know beforehand
what sort of graph you're generating. I want to be able to generate a graph
(irrespective of the type) and then use a common process to label them so I
don't have to think about which way I generated the graph to start with...

Cheers,

Rik

-----Original Message-----
From: Richard.Cotton at hsl.gov.uk [mailto:Richard.Cotton at hsl.gov.uk] 
Sent: 09 March 2009 16:45
To: Rik Schoemaker
Cc: r-help at r-project.org; r-help-bounces at r-project.org
Subject: Re: [R] Adding text to both grid and base graphs

> I generate graphs using both the grid system (with lattice) and the 
> base system. I'd like to be able to identify these graphs later on 
> with a bit
of
> identifying text (e.g. a date and some comments). Adding text to these 
> graphs cannot be done using a common system if you want to save them 
> as
emf
> files. I now use:
> 
> mtext("labelling
> text",outer=TRUE,at=0.5,adj=0.5,line=-1.1,side=1,cex=0.7,col="darkgrey
> ")
> 
> for base graphs and
> 
> grid.text("labelling
text",x=0.5,y=0.005,just="bottom",gp=gpar(fontsize=8,
> col="darkgrey"))
> 
> for grid graphs.
> 
> Unfortunately if I were to use mtext on a grid graph and copy to emf, 
> I
get
> the error:
> Error in dev.copy(win.metafile, pltfile) : invalid graphics state
> 
> Is there a way to detect the current graphics state so I can choose
which
> command to give automatically? (or is there an easier way to go about
this?)

The easier way: use win.metafile to save your plots, e.g.

win.metafile("base.emf")
plot(runif(50))
mtext("labelling 
text",outer=TRUE,at=0.5,adj=0.5,line=-1.1,side=1,cex=0.7,col="darkgrey")
dev.off()

win.metafile("grid.emf")
xyplot(runif(50)~1:50)
grid.text("labelling text",x=0.5,y=0.005,just="bottom",gp=gpar(fontsize=8, 
col="darkgrey"))
dev.off()

Regards,
Richie.

Mathematical Sciences Unit
HSL


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