Nothing
## segments.circle.R
segments.circle <- function(rho, shift, circle=360,
ncp=1000, gp=gpar()) {
## Creates a grob for segments of a circle
## Author: Rene Locher
## Version: 2009-03-16
Dphi <- circle/nrow(rho) ## size of segment
dphi0 <- circle/ncp ## delta wanted
n <- floor(Dphi/dphi0) ## max. number of pieces of lines per segment
dphi <- circle/n/nrow(rho) ## delta used
x <- y <- matrix(rep(NA,n*prod(dim(rho))),ncol=ncol(rho))
phi <- seq(-Dphi/2+shift,length.out=n*nrow(rho),by=dphi)
for (ii in 0:(nrow(rho)-1)) {
x[(ii*n+1):((ii+1)*n),] <-
outer(sin(2*pi*phi[(ii*n+1):((ii+1)*n)]/circle),rho[ii+1,])
y[(ii*n+1):((ii+1)*n),] <-
outer(cos(2*pi*phi[(ii*n+1):((ii+1)*n)]/circle),rho[ii+1,])
}
x <- as.vector(x)
y <- as.vector(y)
id <- rep(1:ncol(rho), rep(nrow(rho)*n,ncol(rho)))
polygonGrob(name = "data",
x = x,
y = y,
id = id,
default.units = "native",
gp = gp)
} ## segments.circle
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