[R] polygons on scatterplot3d

From: Jon Loehrke <jloehrke_at_umassd.edu>
Date: Fri, 11 Apr 2008 15:01:03 -0400


Does anyone have any experience plotting complex polygons on a scatterplot3d display? I would like to present some spatially binned data in a 3-d type plot with background polygons (i.e.. a filled coastline map). I can get the coastline onto the plot window as a line type but cannot figure out how to fill the shape. I'm certain it may be possible but might require a bit of digging into the scatterplot3d code and rotational method.

Any and all help or suggestions appreciated.

EX.

library(scatterplot3d)

# get a coastline

library(maps)
library(mapdata)
coast<-map('worldHires', c('usa','canada'),xlim=c(-72,-67), ylim=c(40,45),fill=TRUE, col='gray')
# note: substitute a simple polygon if you don't have maps and mapdata
# coast<-list()
# coast$x<-c(-70.5,-70.5,-70,-70)
# coast$y<-c(41.2,43,43,41.2)

lat<-c(41,41.5,42,42.5,43)
long<-c(-71,-69.5,-70,-70.2,-69.8)
weight<-c(80,20,30,30,10)

p3d<-scatterplot3d(long, lat, weight, angle=75, type='h', box=FALSE, asp=1, grid=FALSE)
p3d$points3d(coast$x,coast$y,rep(0, length(coast$x)), type='l', col='gray')
# Now how to fill this polygon...?

Cheers,

Jon
Mac OS 10.5
R 2.6.2
Intelligence Finite

Jon Loehrke
Graduate Research Assistant
Department of Fisheries Oceanography
School for Marine Science and Technology University of Massachusetts
200 Mill Road, Suite 325
Fairhaven, MA 02719
jloehrke_at_umassd.edu
508-910-6393

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