thanks jim,
I had to move the legend to a different place (as the default) because 
for some reasons it appeared to me "sliced" on the left side (but I'm 
not sure if that was due to my own configuration, anyway...); I think 
that the possibility to control the size of the point labels would be a 
good new feature (even if not essential) in the triax.plot function
thank you for your valuable work
best

massmi



Il 20/12/2012 11:50, Jim Lemon ha scritto:
> On 12/19/2012 11:18 PM, maxbre wrote:
>> Given this example
>>
>> library(plotrix)
>>
>> a<-c(34,10,70)
>> b<-c(33,10,20)
>> c<-c(33,80,10)
>>
>> test<-data.frame(A=a,B=b,C=c)
>>
>> triax.plot(test,
>>             main ="title",
>>             at=seq(0.25,0.75,by=0.25),
>>             tick.labels=list(l=seq(0.25,0.75,by=0.25),
>>                             r=seq(0.25,0.75,by=0.25),
>>                             b=seq(0.25,0.75,by=0.25)),
>>             align.labels=TRUE,
>>             show.grid=TRUE,
>>             cc.axes=TRUE,
>>             show.legend=TRUE,
>>             label.points=TRUE,
>>             point.labels=c("case 1","case 2", "case 3"),
>>             col.symbols=c("red","blue","green"),
>>             cex.ticks=0.8,
>>             cex.axis=0.8,
>>             lty.grid=2,
>>             pch=17
>>             )
>>
>> I would like to control the position of the legend (to be moved to a
>> different place) and the size of point labels (to be reduced)
>>
>> I’ve been trying to work out the solution with par() but without much
>> success, any help for this?
>>
> Hi maxbre,
> For the legend, I would suggest calling triax.plot  with legend=FALSE 
> and then adding the legend where you want it. To change the size of 
> the point labels you would have to modify the function. Here is the 
> triax.points function with the necessary modification:
>
> triax.points<-function(x,show.legend=FALSE,label.points=FALSE,
>  point.labels=NULL,col.symbols=par("fg"),pch=par("pch"),
>  bg.symbols=par("bg"),cc.axes=FALSE,...) {
>
>  if(dev.cur() == 1)
>   stop("Cannot add points unless the triax.frame has been drawn")
>  if(missing(x))
>   stop("Usage: triax.points(x,...)\n\twhere x is a 3 column array of 
> proportions or percentages")
>  if(!is.matrix(x) && !is.data.frame(x))
>   stop("x must be a matrix or data frame with at least 3 columns and 
> one row.")
>  if(any(x > 1) || any(x < 0)) {
>   if(any(x < 0))
>    stop("All proportions must be between zero and one.")
>   if(any(x > 100))
>    stop("All percentages must be between zero and 100.")
>   # convert percentages to proportions
>   x<-x/100
>  }
>  if(any(abs(rowSums(x)-1) > 0.01))
>   warning("At least one set of proportions does not equal one.")
>  sin60<-sin(pi/3)
>  if(cc.axes) {
>   ypos<-x[,3]*sin60
>   xpos<-x[,1]+x[,3]*0.5
>  }
>  else {
>   ypos<-x[,3]*sin60
>   xpos<-1-(x[,1]+x[,3]*0.5)
>  }
>  nobs<-dim(x)[1]
>  points(x=xpos,y=ypos,pch=pch,col=col.symbols,bg=bg.symbols,type="p",...)
>  if(is.null(point.labels)) point.labels<-rownames(x)
>  if(label.points) 
> thigmophobe.labels(xpos,ypos,point.labels,cex=par("cex.axis"))
>  if(show.legend) {
>   legend(0.2,0.7,legend=point.labels,pch=pch,col=col.symbols,
>    xjust=1,yjust=0)
>  }
>  invisible(list(x=xpos,y=ypos))
> }
>
> Note that some lines above may have been broken by the email client. 
> If so, stitch them back together with a text editor before trying to 
> "source" the file. I will probably add something like this to 
> triax.plot in the next version of plotrix.
>
> Jim
>
>


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