The default units of polygonGrob are "npc", I think you want "native" instead.
Try the following, library(grid) d = data.frame(x=rnorm(100, 10), y=rnorm(100, -100)) v = dataViewport(xData=d$x, yData=d$y) grid.points(d$x,d$y, default.units="native", vp=v) HTH, b. On 17 February 2012 02:47, geotheory <geotheo...@gmail.com> wrote: > Am just feeling my way into the grid library, and cannot figure out how to > define the plot limits. 3/5 of the example polygons below plot in the > default 0-1 range viewport. But when I try to redefine the viewport the > polygons plot in the same places. I also get the same result without > employing push/pop. (As you can see from the scale I'm trying to introduce, > I want to plot map polygons.) Grateful for an idea where I'm going wrong. > > pushViewport(viewport(xscale=c(-180,180),yscale=c(-90,90))) > > grid.polygon(x=c(0,5,5,0)/100, y=c(0,0,5,5)/100, draw = T) > grid.polygon(x=c(100,95,95,100)/100, y=c(100,100,95,95)/100, draw = T) > grid.polygon(x=c(50,70,70,50)/100, y=c(50,50,70,70)/100, draw = T) > grid.polygon(x=-c(10,10,40,40)/100, y=c(10,40,40,10)/100, draw = T) > #NEGATIVE X > grid.polygon(x=c(50,52,52,50)/100, y=-c(50,50,52,52)/100, draw = T) > #NEGATIVE Y > > popViewport() > > Thanks in advance. > > -- > View this message in context: > http://r.789695.n4.nabble.com/Defining-a-viewport-scale-in-Grid-tp4393974p4393974.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. ______________________________________________ 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.
