Thanks for the help, Carlos and Jean.

What y'all sent worked beautifully. Ultimately I chose to use the rect()
function. Below is my functional code (with a legend thrown in for good
measure):

plot(x = c(1,numYears), y = c(200,300), main = c("Successional Trajectories
for ",startState," Over Time"),
     xlab = "Time", ylab = "Vegetation Class", xlim = c(100,700), ylim =
c(200,300), axes = FALSE, type="n")
axis(1, at = c(100,200,300,400,500,600), labels =
c("0","100","200","300","400","500"))
rect(100, 199, 600, 205, border = NA,
col=rgb(250,250,0,100,maxColorValue=255))#Yellow OA
rect(100, 209, 600, 213, border = NA,
col=rgb(250,125,0,100,maxColorValue=255))#Orange OW
rect(100, 219, 600, 222, border = NA,
col=rgb(180,100,0,100,maxColorValue=255))#Dk Orange OD
rect(100, 229, 600, 235, border = NA,
col=rgb(140,250,0,100,maxColorValue=255))#Lt Green DO
rect(100, 239, 600, 248, border = NA,
col=rgb(60,100,0,100,maxColorValue=255))#Dk Green DD
rect(100, 259, 600, 266, border = NA,
col=rgb(50,175,130,100,maxColorValue=255))#Teal DM
rect(100, 269, 600, 272, border = NA,
col=rgb(50,100,100,100,maxColorValue=255))#Slate DG
rect(100, 279, 600, 287, border = NA,
col=rgb(0,250,250,100,maxColorValue=255))#Lt Blue BM
leg.txt <- c("BM","DG","DM","DD","DO","OD","OW","OA")
legend("topright", legend = leg.txt, inset = 0, title = "Community Types",
       fill = c(rgb(0,250,250,100,maxColorValue=255),
rgb(50,100,100,100,maxColorValue=255),
rgb(50,175,130,100,maxColorValue=255),
            rgb(60,100,0,100,maxColorValue=255),
rgb(140,250,0,100,maxColorValue=255), rgb(180,100,0,100,maxColorValue=255),
            rgb(250,125,0,100,maxColorValue=255),
rgb(250,250,0,100,maxColorValue=255)),
      bty = "n")

Thanks again for the help!

- Gabe

On Tue, Oct 11, 2011 at 11:39 AM, Jean V Adams <jvadams@usgs.gov> wrote:

>
> Carlos Ortega wrote on 10/11/2011 11:30:46 AM:
>
> >
> > Hi,
> >
> > Yes, one way to do that is by using function polygon().
> >
> > Regards,
> > Carlos Ortega
> >
> www.qualityexcellence.es
>
> >
> > 2011/10/11 Gabriel Yospin <yosping@gmail.com>
> >
> > > Hi R-Help -
> > >
> > > If I make a plot:
> > >
> > > numYears = 500
> > > plot(x = c(1,numYears), y = c(200,300), xlab = "Time", ylab =
> "Vegetation
> > > Class", xlim = c(100,600), ylim = c(200,300), type="n")
> > >
> > > Is there a way to make different parts of the background for the plot
> > > different colors?
> > >
> > > For example, I'd like to have the background color col = (250,250,0,50)
> for
> > > y = c(200,204), and col = (250,125,0,50) for y = c(210,212).
> > >
> > > Any suggestions?
> > >
> > > Thanks in advance for the help,
> > >
> > > Gabe
> > > --
> > > Gabriel I. Yospin
> > >
> > > Institute of Ecology and Evolution
> > > Bridgham Lab
> > > University of Oregon
> > > Eugene, OR 97403-5289
> > >
> > > Ph: 541 346 1549
> > > Fax: 541 346 2364
>
>
> For example:
>
> plot(1, 1, xlab="Time", ylab="Vegetation Class",
>         xlim=c(100, 600), ylim=c(200, 300), type="n")
> xrange <- par("usr")[1:2]
> polygon(c(xrange, rev(xrange)), c(200, 200, 204, 204),
>         col=rgb(250, 250, 0, 50, maxColorValue=255), border=NA)
> polygon(c(xrange, rev(xrange)), c(210, 210, 212, 212),
>         col=rgb(250, 125, 0, 50, maxColorValue=255), border=NA)
> points(10*(20:30), 10*(20:30))
>
> Jean

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