Dear members,
I wish to create many circles and split them into sectors then colour the
sectors based on value attributed to the plot, then plot a colormap.
I have thus far been able to create the polygons, create the colorbar and
colour the sectors, but i know for a fact the colour isn't representative of
the value inside the sectors.
Any ideas how to adjust the function(s) so that the colour is representative of
the value attributed to the sector?
## Get circle pointscircs <- function(radii, sectors=4) { radii <- sort(radii)
rads <- seq(0, 2*pi, length=2*length(radii)*sectors) # sample at these
radians do.call(rbind, lapply(radii, function(r) # points
for drawing circles data.frame(X=r*cos(rads), Y=r*sin(rads),
sector=rep(1:sectors, each=length(rads)/sectors), theta=rads,
radius=r)))}
## Draw figuredrawCirc <- function(radii, sectors, hues=NULL, densities=NULL,
...) { polys <- circs(radii, sectors) if (missing(hues)) { colors <-
colorRampPalette(c("green","yellow","red","blue"))(sectors*length(radii)) }
else colors <- heat.colors(n=sectors*length(radii),alpha=hues) ind=0
plot(polys[,1:2], type="n" ,...) # blank plot for (i in seq_along(radii))
{ # add polygons for (j in 1:sectors) { ind <- ind+1 color <-
colors[ind] with(polys[polys$sector==j,], if (i == 1) {
polygon(x=c(0, X[radius==radii[i]], 0), y=c(0, Y[radius==radii[i]], 0),
col=color, density=densities[ind]) } else
polygon(x=c(X[radius==radii[i-1]], rev(X[radius==radii[i]])),
y=c(Y[radius==radii[i-1]], rev(Y[radius==radii[i]])),
col=color, density=densities[ind])) } }
cols<-colorRampPalette(c("blue","red","yellow","green"))(sectors*length(radii))
vert!
ical.image.legend(col=cols, zlim=range(c(1,0)))}
drawCirc(radii=1:50, sectors=24, main="Ratio by Colors")
Please note, that the hues allows for the transparency to take into account the
values of the sectors but i want the colours to be fully opaque not
transparent. As this causes issues with the colorbar on the right hand side.
Thank you in advance for any suggestion.
bryar
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