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# plots data as radial lines or a polygon on a 24 hour "clockface" going
# clockwise. clock.pos should be in decimal hours between 0 and 24.
# use hm2dec=TRUE to convert hour/minute values to hour/decimal values.
# example: clock24.plot(rnorm(16)+3,seq(5.5,20.5,length.out=16))
clock24.plot<-function(lengths,clock.pos,labels=0:23,minutes=FALSE,
hm2dec=FALSE,label.pos=NULL,rp.type="r",loglen=FALSE,explab=FALSE,...) {
npos<-length(lengths)
# if no positions are given, spread the lines out over the circle
if(missing(clock.pos)) clock.pos<-seq(0,24-24/(npos+1),length=npos)
else {
if(hm2dec) {
splittime<-strsplit(clock.pos,":")
hm2dh<-function(x) return(as.numeric(x[1])+as.numeric(x[2])/60)
clock.pos<-sapply(splittime,hm2dh)
}
}
# start at "midnight" and go clockwise
radial.pos<-pi*(clock.pos*15)/180
if(minutes) labels<-paste(labels,"00",sep=":")
if(is.null(label.pos)) label.pos<-seq(0,pi*1.917,length.out=24)
invisible(radial.plot(lengths,radial.pos,labels=labels,label.pos=label.pos,
rp.type=rp.type,start=pi/2,clockwise=TRUE,loglen=loglen,explab=explab,...))
}
# plots data as radial lines or a polygon starting at the right and going
# counterclockwise.
# angles should be given in 0-360 values, use radial.plot for radians
# example: polar.plot(rnorm(20)+3,seq(90,280,by=10))
polar.plot<-function(lengths,polar.pos=NULL,labels,label.pos=NULL,
start=0,clockwise=FALSE,rp.type="r",loglen=FALSE,explab=FALSE,...) {
npoints<-length(lengths)
if(is.null(polar.pos)) {
halfinc<-pi/npoints # evenly spaced, offset from zero
radial.pos<-seq(halfinc,2*pi-halfinc,length.out=npoints)
}
else radial.pos<-pi*polar.pos/180
if(start) start<-pi*start/180
if(missing(labels)) {
labels<-label.pos<-seq(0,340,by=20)
label.pos<-pi*label.pos/180
}
invisible(radial.plot(lengths,radial.pos,labels,label.pos,start=start,
clockwise=clockwise,rp.type=rp.type,loglen=loglen,explab=explab,...))
}
# plots radial lines of length 'lengths', symbols at 'lengths' from the
# center or a polygon with corresponding vertices at 'radial.pos' in radians.
# starts at the 'east' position and goes counterclockwise unless
# the "start" and "clockwise" arguments are changed
# label.prop is the proportion of max(lengths) that gives the
# radial position of the labels
radial.plot<-function(lengths,radial.pos=NULL,labels=NA,label.pos=NULL,
radlab=FALSE,start=0,clockwise=FALSE,rp.type="r",label.prop=1.1,main="",
xlab="",ylab="",line.col=par("fg"),lty=par("lty"),lwd=par("lwd"),
mar=c(2,2,3,2),show.grid=TRUE,show.grid.labels=4,show.radial.grid=TRUE,
rad.col="gray",grid.col="gray",grid.bg="transparent",grid.left=FALSE,
grid.unit=NULL,point.symbols=1,point.col=par("fg"),show.centroid=FALSE,
radial.lim=NULL,radial.labels=NULL,boxed.radial=TRUE,poly.col=NA,
add=FALSE,loglen=FALSE,explab=FALSE,...) {
# first convert lengths to log values if desired
if(loglen) lengths<-do.call(log10,list(lengths))
if(is.null(radial.lim)) radial.lim<-c(floor(min(lengths,na.rm=TRUE)),
ceiling(max(lengths,na.rm=TRUE)))
length.dim<-dim(lengths)
if(is.null(length.dim)) {
npoints<-length(lengths)
nsets<-1
lengths<-matrix(lengths,nrow=1)
}
else {
npoints<-length.dim[2]
nsets<-length.dim[1]
lengths<-as.matrix(lengths)
}
lengths<-lengths-radial.lim[1]
lengths[lengths<0]<-NA
if(is.null(radial.pos)) {
halfinc<-pi/npoints # evenly spaced, offset from zero
radial.pos<-seq(halfinc,2*pi-halfinc,length.out=npoints)
}
if(is.null(label.pos)) label.pos=radial.pos
radial.pos.dim<-dim(radial.pos)
if(is.null(radial.pos.dim))
radial.pos<-matrix(rep(radial.pos,nsets),nrow=nsets,byrow=TRUE)
else radial.pos<-as.matrix(radial.pos)
if(rp.type == "l" && clockwise == TRUE) start<-pi/2
if(clockwise) radial.pos<--radial.pos
if(start) radial.pos<-radial.pos+start
if(show.grid) {
if(loglen == 0) {
if(length(radial.lim) < 3) grid.pos<-pretty(radial.lim)
else grid.pos<-radial.lim
} else {
# log scaling is ON
rangerl<-ceiling(radial.lim)
grid.pos<-rangerl[1]:rangerl[2]
oddnum<-length(grid.pos) %% 2
if(oddnum) dropit<-2
while(length(grid.pos) > 6) {
if(oddnum) {
grid.pos<-grid.pos[-dropit]
dropit<-dropit+1
} else {
grid.pos<-grid.pos[seq(1,length(grid.pos),by=2)]
}
}
if(is.null(radial.labels)) {
if(explab) radial.labels<-paste0(10,"^",grid.pos)
else radial.labels<-10^grid.pos
}
if(grid.pos[1] < radial.lim[1]) grid.pos[1]<-radial.lim[1]
angles<-seq(0,1.96*pi,by=0.04*pi)
}
maxlength<-max(grid.pos-radial.lim[1])
} else {
grid.pos<-NA
maxlength<-diff(radial.lim)
}
oldpar<-par("xpd","mar","pty")
if(!add) {
par(mar=mar,pty="s")
plot(c(-maxlength,maxlength),c(-maxlength,maxlength),type="n",axes=FALSE,
main=main,xlab=xlab,ylab=ylab)
if(show.grid) {
radial.grid(labels=labels,label.pos=label.pos,radlab=radlab,
radial.lim=radial.lim,start=start,clockwise=clockwise,
label.prop=label.prop,grid.pos=grid.pos,rad.col=rad.col,
grid.col=grid.col,grid.bg=grid.bg,
show.radial.grid=show.radial.grid)
}
}
par(xpd=TRUE)
# stretch everything out to the correct length
if(length(line.col) < nsets) line.col<-1:nsets
if(length(rp.type) < nsets) rp.type<-rep(rp.type,length.out=nsets)
if(length(point.symbols) < nsets)
point.symbols<-rep(point.symbols,length.out=nsets)
if(length(point.col) < nsets) point.col<-rep(point.col,length.out=nsets)
if(length(poly.col) < nsets) poly.col<-rep(poly.col,length.out=nsets)
if(length(lty) < nsets) lty<-rep(lty,length.out=nsets)
if(length(lwd) < nsets) lwd<-rep(lwd,length.out=nsets)
for(i in 1:nsets) {
if(nsets > 1) {
linecol<-line.col[i]
polycol<-poly.col[i]
pointcol<-point.col[i]
pointsymbols<-point.symbols[i]
ltype<-lty[i]
lwidth<-lwd[i]
}
else {
linecol<-line.col
polycol<-poly.col
pointcol<-point.col
pointsymbols<-point.symbols
ltype<-lty
lwidth<-lwd
}
# split up rp.type if there is a combination of displays
rptype<-unlist(strsplit(rp.type[i],""))
if(match("s",rptype,0)) {
if(is.null(pointsymbols)) pointsymbols<-i
if(is.null(pointcol)) pointcol<-i
}
# get the vector of x positions
xpos<-cos(radial.pos[i,])*lengths[i,]
# get the vector of y positions
ypos<-sin(radial.pos[i,])*lengths[i,]
# plot radial lines if rp.type == "r"
if(match("r",rptype,0))
segments(0,0,xpos,ypos,col=linecol,lty=ltype,lwd=lwidth,...)
if(match("p",rptype,0))
polygon(xpos,ypos,border=linecol,col=polycol,lty=ltype,
lwd=lwidth,...)
if(match("s",rptype,0))
points(xpos,ypos,pch=point.symbols,col=pointcol,...)
if(match("t",rptype,0)) {
if(boxed.radial)
boxed.labels(xpos,ypos,point.symbols,col=pointcol)
else text(xpos,ypos,point.symbols,col=pointcol)
}
if(match("l",rptype,0))
lines(xpos,ypos,lty=ltype,lwd=lwidth,col=linecol,...)
if(show.centroid) {
if(match("p",rptype,0)) {
nvertices<-length(xpos)
# first get the "last to first" area component
polygonarea<-xpos[nvertices]*ypos[1] - xpos[1]*ypos[nvertices]
for(vertex in 1:(nvertices-1))
polygonarea<-
polygonarea+xpos[vertex]*ypos[vertex+1]-xpos[vertex+1]*ypos[vertex]
polygonarea<-polygonarea/2
centroidx<-
(xpos[nvertices]+xpos[1])*(xpos[nvertices]*ypos[1]-xpos[1]*ypos[nvertices])
centroidy<-
(ypos[nvertices]+ypos[1])*(xpos[nvertices]*ypos[1]-xpos[1]*ypos[nvertices])
for(vertex in 1:(nvertices-1)) {
centroidx<-centroidx + (xpos[vertex]+xpos[vertex+1])*
(xpos[vertex]*ypos[vertex+1]-xpos[vertex+1]*ypos[vertex])
centroidy<-centroidy + (ypos[vertex]+ypos[vertex+1])*
(xpos[vertex]*ypos[vertex+1]-xpos[vertex+1]*ypos[vertex])
}
points(centroidx/(6*polygonarea),centroidy/(6*polygonarea),
col=point.col[i],pch=point.symbols[i],cex=2,...)
}
else
points(mean(xpos),mean(ypos),col=pointcol,pch=pointsymbols,
cex=2,...)
}
}
if(show.grid.labels && !add) {
if(show.grid.labels%%2) {
ypos<-grid.pos-radial.lim[1]
xpos<-rep(0,length(grid.pos))
if(show.grid.labels==1) ypos<--ypos
}
else {
xpos<-grid.pos-radial.lim[1]
ypos<-rep(0,length(grid.pos))
if(show.grid.labels==2) xpos<--xpos
}
if(is.null(radial.labels)) radial.labels<-grid.pos
if(!is.null(grid.unit))
radial.labels[length(grid.pos)]<-
paste0(radial.labels[length(grid.pos)],grid.unit)
if(boxed.radial)
boxed.labels(xpos,ypos,radial.labels,border=FALSE,
cex=par("cex.lab"))
else text(xpos,ypos,radial.labels,cex=par("cex.lab"))
}
invisible(oldpar)
}
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