On 26-Jul-11 11:26:14, Jim Lemon wrote: > On 07/26/2011 02:40 AM, Naomi Robbins wrote: >> Hello! >> It's a shoot in the dark, but I'll try. If one has a total of 100 >> (e.g., %), and three components of the total, e.g., >> mytotal=data.frame(x=50,y=30,z=20), - one could build a pie chart with >> 3 sectors representing x, y, and z according to their proportions in >> the total. >> I am wondering if it's possible to build something very similar, but >> not on a circle but in a square... > > > Is this still going on? Okay, here's a square pie: > > squarePie<-function(slices,x0=0,y0=0,x1=1,y1=1,firstcall=TRUE,pos=1, > col=NULL,show.values=TRUE,...) { > sliceprop<-slices[1]/sum(slices) > if(firstcall) { > oldmar<-par(mar=c(2,2,3,2)) > > plot(0,xlim=c(0,1),ylim=c(0,1),xaxs="i",yaxs="i",type="n",axes=FALSE, > xlab="",ylab="",...) > if(is.null(col)) col=rainbow(length(slices)) > } > if(pos == 1) { > ytop<-y0+(y1-y0)*sliceprop > rect(x0,y0,x1,ytop,col=col[1]) > if(show.values) text((x0+x1)/2,(y0+ytop)/2,slices[1]) > y0<-ytop > } > if(pos == 2) { > xright<-x0+(x1-x0)*sliceprop > rect(x0,y0,xright,y1,col=col[1]) > if(show.values) text((x0+xright)/2,(y0+y1)/2,slices[1]) > x0<-xright > } > if(pos == 3) { > ybottom<-y1-(y1-y0)*sliceprop > rect(x0,ybottom,x1,y1,col=col[1]) > if(show.values) text((x0+x1)/2,(ybottom+y1)/2,slices[1]) > y1<-ybottom > } > if(pos == 4) { > xleft<-x1-(x1-x0)*sliceprop > rect(xleft,y0,x1,y1,col=col[1]) > if(show.values) text((xleft+x1)/2,(y0+y1)/2,slices[1]) > x1<-xleft > } > pos<-ifelse(pos==4,1,pos+1) > if(length(slices > 1)) > > squarePie(slices[-1],x0,y0,x1,y1,firstcall=FALSE,pos=pos,col=col[-1]) > if(firstcall) par(oldmar) > } > > squarePie(c(4,3,6,2,5,1),main="A square meal from Oz") > > Jim
A very nice implementation, Jim! However, its existence allows me to test some perceptual concerns I have had about the "square pie chart" concept -- not unlrelated to the one we all have about ordinary pie charts, but somewhat different in nature. Namely, it is interesting to comare the impressions one forms of: squarePie(c(10,9,8,7,6,5,4,3,2,1),main="A square meal from Oz") X11() squarePie(c(1,2,3,4,5,6,7,8,9,10),main="A square meal from Oz") Possibly there may be scope for additional flexibility regarding the order in which the rectangles are placed in the chart. I know the user can select this by re-arranging 'slices', but maybe the function itself could try to be "intelligent" about this (though I'm at a loss at the moment to suggest what the basis for this should be)! Best wishes, Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@wlandres.net> Fax-to-email: +44 (0)870 094 0861 Date: 26-Jul-11 Time: 13:03:43 ------------------------------ XFMail ------------------------------ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.