Hello Kerstin,
I had done something like this in the past but can't find it any more,
so I've put up a very raw example you might want to sophisticate upon.
The idea is that of drawing an empty high-level plot and then putting
some low-level elements (mainly bars and connecting lines) into it
according to the coordinates of the data. Attached below, I hope it
helps and avoids you the sin of importing ppt charts into LaTeX
(aaargh!).
PS The 'grid' package can help you produce more sophisticated (possibly
more "corporate-like", if this is a virtue...) graphs while retaining
the level of automation possible with R: e.g., for using Sweave for
automatic report generation. I'm sending you some examples by separate
mail.
Best,
Giovanni
examples: cascadeplot(rnorm(10)); cascadeplot(c(3,2,-7,5,8,3,-9,10))
cascadeplot <- function(x, barwidth=2, barspace=1,
colpalette=rep(grey(0.5), length(x)),
linecol="orange", ...) {
## how many bars? one for each data point
barnum <- length(x)
## total graph width
grw <- (barnum+1)*barspace+barnum*barwidth
## graph height
l.grh <- min(cumsum(x),0)
u.grh <- max(cumsum(x))+1
## draw an empty plot with the required dims
## (passing on any graphic parm you like, e.g. 'title')
plot(0:grw, ylim=c(l.grh,u.grh), xlim=c(0,grw), type="n", ...)
## draw x axis
lines(c(0,grw), c(0,0), col="blue")
## init vector (this will be useful later)
ytxtpos <- rep(NA, length(x))
## for each data point draw a polygon
## starting from the level reached by the
## previous bar
for(i in 1:length(x)) {
## each bar has 4 verices, abcd
## x coordinates for them:
## left vertices: ab, right: cd
## so bars are drawn like a->b->c->d
leftx <- barspace+(barspace+barwidth)*(i-1)
rightx <- leftx+barwidth
xcoo <- c(leftx, leftx, rightx, rightx)
## y coord.:
## lower y:
if(i==1) {
lowy <- 0
} else {
lowy <- cumsum(x)[i-1]
}
highy <- cumsum(x)[i]
ycoo <- c(lowy, highy, highy, lowy)
polygon(xcoo, ycoo, col=colpalette[i], ...)
## now draw the connecting lines between
## the current and the previous bar
if(i > 1) {
lines(x=c(leftx-barspace,leftx),
y=c(lowy,lowy),
col=linecol)
}
## save top-bar position for label
ytxtpos[i] <- max(lowy, highy)+0.05*(u.grh-l.grh)
}
## lastly, put the values on top of the bars
xtxtpos <- (1:length(x))*(barwidth+barspace)-barwidth/2
text(xtxtpos,ytxtpos,labels=as.character(x))
}
## original message below
------------------------------
Message: 157
Date: Tue, 03 Feb 2009 11:30:51 +0100
From: Kerstin <kerstin.ba...@open-innovation-projects.org>
Subject: Re: [R] ThinkCell type waterfall charts in R?
To: Jim Lemon <j...@bitwrit.com.au>
Cc: r-help@r-project.org
Message-ID: <49881cdb.3090...@open-innovation-projects.org>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
Jim Lemon wrote:
> Kerstin wrote:
>> Hi all,
>>
>> with PowerPoint and ThinkCell one can draw something they call
>> waterfall chart and it looks like this:
>> http://www.think-cell.com/products/images/waterfall.gif
>>
>> I found discussions on waterfall charts in the archive of this
>> mailinglist, but unfortunately they looked totally different. Other
>> names for this type of plot seem to be bridge chart, cascade chart,
>> stair case chart, etc. but neither of them brought successful
>> results. So I decided to ask you directly on the list.
>>
>> Does anyone have an idea on how I could plot this type of chart in R?
> Well Kirsten, it's a real challenge trying to find something that you
> _can't_ plot in R. Perhaps if you sent some data to the mailing list
> and a description of how the various counts (?) are related to one
> another, some R-nut may reply with what you want.
>
> Jim
Thanks a lot for your quick reply.
In the attached pdf you can see the chart I would like to draw with R. I
could of course make my life easier and use the Power Point chart, but
importing a ppt chart into Latex would not make me sleep very well,
besides the fact that all other plots in my document will come from R
and I don't want this one to look totally different...
Cheers
Kerstin
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------------------------------
Giovanni Millo
Research Dept.,
Assicurazioni Generali SpA
Via Machiavelli 4,
34132 Trieste (Italy)
tel. +39 040 671184
fax +39 040 671160
Ai sensi del D.Lgs. 196/2003 si precisa che le informazi...{{dropped:13}}
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