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hexagon<-function(x,y,unitcell=1,col=NA,border="black") {
polygon(c(x,x,x+unitcell/2,x+unitcell,x+unitcell,x+unitcell/2),
c(y+unitcell*0.125,y+unitcell*0.875,y+unitcell*1.125,y+unitcell*0.875,
y+unitcell*0.125,y-unitcell*0.125),col=col,border=border)
}
color2D.matplot<-function(x,redrange=c(0,1),greenrange=c(0,1),bluerange=c(0,1),
extremes=NA,cellcolors=NA,show.legend=FALSE,nslices=10,xlab="Column",
ylab="Row",do.hex=FALSE,axes=TRUE,show.values=FALSE,vcol="white",vcex=1,
border="black",na.color=NA,...) {
if(is.matrix(x) || is.data.frame(x)) {
xdim<-dim(x)
if(is.data.frame(x)) x<-unlist(x)
else x<-as.vector(x)
oldpar<-par("xaxs","yaxs","xpd","mar")
par(xaxs="i",yaxs="i")
if(do.hex) par(mar=c(5,4,4,4))
plot(c(0,xdim[2]),c(0,xdim[1]),xlab=xlab,ylab=ylab,type="n",axes=FALSE,...)
oldpar$usr<-par("usr")
if(!do.hex) {
box()
pos<-0
}
else pos<- -0.3
if(axes) {
xticks<-pretty(0:xdim[2])[-1]
axis(1,at=xticks-0.5,labels=xticks,pos=pos)
yticks<-pretty(0:xdim[1])[-1]
axis(2,at=xdim[1]-yticks+0.5,yticks)
}
if(all(is.na(cellcolors)))
cellcolors<-color.scale(x,redrange,greenrange,bluerange,extremes,na.color)
# start from the top left - isomorphic with the matrix layout
if(do.hex) {
par(xpd=TRUE)
offset<-0
if(length(border) < xdim[1]*xdim[2])
border<-rep(border,length.out=xdim[1]*xdim[2])
for(row in 1:xdim[1]) {
for(column in 0:(xdim[2]-1)) {
hexagon(column+offset,xdim[1]-row,col=cellcolors[row+xdim[1]*column],
border=border[row+xdim[1]*column])
if(show.values)
text(column+offset+0.5,xdim[1]-row+0.5,x[row+column*xdim[1]],
col=vcol,cex=vcex)
}
offset<-ifelse(offset,0,0.5)
}
par(xpd=FALSE)
}
else {
rect(sort(rep((1:xdim[2])-1,xdim[1])),rep(seq(xdim[1]-1,0,by=-1),xdim[2]),
sort(rep(1:xdim[2],xdim[1])),rep(seq(xdim[1],1,by=-1),xdim[2]),
col=cellcolors,border=border)
if(show.values)
text(sort(rep((1:xdim[2])-0.5,xdim[1])),
rep(seq(xdim[1]-0.5,0,by=-1),xdim[2]),
round(x,show.values),col=vcol,cex=vcex)
}
naxs<-which(is.na(x))
xy<-par("usr")
plot.din<-par("din")
plot.pin<-par("pin")
bottom.gap<-(xy[3]-xy[4])*(plot.din[2]-plot.pin[2])/(2*plot.pin[2])
grx1<-xy[1]
gry1<-bottom.gap*0.95
grx2<-xy[1]+(xy[2]-xy[1])/4
gry2<-bottom.gap*0.8
if(length(cellcolors) > 1) {
colmat<-col2rgb(c(cellcolors[which.min(x)],cellcolors[which.max(x)]))
redrange<-colmat[1,]/255
greenrange<-colmat[2,]/255
bluerange<-colmat[3,]/255
}
rect.col<-color.scale(1:nslices,redrange,greenrange,bluerange)
if(show.legend)
color.legend(grx1,gry1,grx2,gry2,round(range(x,na.rm=TRUE),show.legend),
rect.col=rect.col)
par(oldpar)
}
else cat("x must be a data frame or matrix\n")
}
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