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# Try to rewrite this for an arbitrary number of gaps
# It works by modifying the x or y values so that values
# to the right of the gap are reduced appropriately. Then
# it draws the plot in one call per section, skipping values that are
# in the gap.
gap.plot<-function(x,y,gap,gap.axis="y",bgcol="white",breakcol="black",
brw=0.02,xlim=range(x),ylim=range(y),xticlab,xtics=NA,yticlab,ytics=NA,
lty=rep(1,length(x)),col=rep(par("col"),length(x)),pch=rep(1,length(x)),
add=FALSE,stax=FALSE,style="gap",bty=par("bty"),xaxt=par("xaxt"),yaxt=par("yaxt"),...) {
if(missing(y) && !missing(x)) {
y<-x
x<-1:length(y)
}
if(missing(gap)) stop("gap must be specified")
gapsize<-diff(gap)
xaxl<-par("xlog")
yaxl<-par("ylog")
if(gap.axis == "y") {
if(length(gap) > 3) ylim[2]<-ylim[2] - (gapsize[1] + gapsize[3])
else ylim[2]<-ylim[2]-gapsize[1]
}
if(gap.axis == "x") {
if(length(gap) > 3) xlim[2]<-xlim[2] - (gapsize[1] + gapsize[3])
else xlim[2]<-xlim[2]-gapsize[1]
}
rangexy <- c(range(xlim),range(ylim))
# gapsize is the size of the single gap in data units
# For two gaps, it is 3 numbers: the size of the first
# gap, the size of the middle section, then the size of the
# second gap.
# brw is the size of the break relative to the size
# of the plot
# ygw for single gap:
xgw<-(rangexy[2]-(rangexy[1]+gapsize))*brw
ygw<-(rangexy[4]-(rangexy[3]+gapsize))*brw
if(is.na(xtics[1])) xtics<-pretty(x)
if(is.na(ytics[1])) ytics<-pretty(y)
if(missing(xticlab)) xticlab<-xtics
if(missing(yticlab)) yticlab<-ytics
if(length(col) < length(y)) col<-rep(col,length.out=length(y))
if(gap.axis == "y") {
littleones<-which(y < gap[1])
if(length(gap) > 3) {
middleones<-which(y >= gap[2] + ygw[1] & y < gap[3])
bigones<-which(y >= gap[4] + ygw[1] + ygw[3])
lostones<-sum(c(y > gap[1] & y < gap[2] + ygw[1],
y > gap[3] & y < gap[4] + ygw[1] + ygw[3]))
}
else {
middleones<-NA
bigones<-which(y >= gap[2] + ygw)
lostones<-sum(y > gap[1] & y < gap[2] + ygw)
}
if(lostones) warning("some values of y may not be displayed")
}
else {
littleones<-which(x < gap[1])
if(length(gap) > 3) {
middleones<-which(x >= gap[2] + xgw[1] & x < gap[3])
bigones<-which(x >= gap[4] + xgw[1] + xgw[3])
lostones<-sum(c(x > gap[1] & x < gap[2] + xgw[1],
x > gap[3] & x < gap[4] + xgw[1] + xgw[3]))
if(missing(xlim)) xlim<-c(min(x),max(x) - (gapsize[1] + gapsize[3]))
}
else {
middleones<-NA
bigones<-which(x >= gap[2])
lostones<-sum(x > gap[1] & x < gap[2] + xgw)
if(missing(xlim)) xlim<-c(min(x),max(x) - gapsize[1])
}
if(lostones) warning("some values of x will not be displayed")
if(missing(ylim)) ylim<-range(y)
}
if(length(lty) < length(x)) lty<-rep(lty,length.out=length(x))
if(length(col) < length(x)) col<-rep(col,length.out=length(x))
if(length(pch) < length(x)) pch<-rep(pch,length.out=length(x))
if(add) {
points(x[littleones],y[littleones],lty=lty[littleones],
col=col[littleones],pch=pch[littleones],...)
if(gap.axis == "y") {
if(length(gapsize) > 2) {
points(x[middleones],y[middleones]-gapsize[1],
lty=lty[middleones],col=col[middleones],pch=pch[middleones],...)
points(x[bigones],y[bigones] - (gapsize[1] + gapsize[3]),
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
else points(x[bigones],y[bigones]-gapsize[1],
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
else {
if(length(gapsize) > 2) {
points(x[middleones] - gapsize[1],y[middleones],
lty=lty[middleones],col=col[middleones],pch=pch[middleones],...)
points(x[bigones] - (gapsize[1] + gapsize[3]),y[bigones],
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
else points(x[bigones]-gapsize[1],y[bigones],
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
}
else {
plot(x[littleones],y[littleones],xlim=xlim,ylim=ylim,axes=FALSE,
lty=lty[littleones],col=col[littleones],pch=pch[littleones],...)
box(bty=bty)
if(gap.axis == "y") {
if(!is.na(xtics[1])) axis(1,at=xtics,labels=xticlab,xaxt=xaxt)
littletics<-which(ytics < gap[1])
if(length(gapsize) > 2) {
middletics<-which(ytics >= gap[2]+ygw[1] & ytics <= gap[3])
bigtics<-which(ytics >= gap[4]+ygw[1]+ygw[3])
show.at<-c(ytics[littletics],ytics[middletics] - gapsize[1],
ytics[bigtics]-(gapsize[1] + gapsize[3]))
show.labels<-c(yticlab[littletics],yticlab[middletics],yticlab[bigtics])
}
else {
bigtics<-which(ytics >= gap[2])
show.at<-c(ytics[littletics],ytics[bigtics] - gapsize[1])
show.labels<-c(yticlab[littletics],yticlab[bigtics])
}
if(stax) {
axis(2,at=show.at,labels=rep("",length(show.labels)))
staxlab(2,at=show.at,labels=show.labels)
}
else axis(2,at=show.at,labels=show.labels)
axis.break(2,gap[1],style=style,bgcol=bgcol,
breakcol=breakcol,brw=brw)
if(length(gapsize) > 2) {
axis.break(2,gap[3]-gapsize[1],style=style,bgcol=bgcol,
breakcol=breakcol,brw=brw)
points(x[middleones],y[middleones]-gapsize[1],
lty=lty[middleones],col=col[middleones],pch=pch[middleones],...)
points(x[bigones],y[bigones]-(gapsize[1]+gapsize[3]),
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
else points(x[bigones],y[bigones]-gapsize[1],
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
# x gaps need to be fixed
else {
if(!is.na(ytics[1])) axis(2,at=ytics,labels=yticlab,yaxt=yaxt)
littletics<-which(xtics < gap[1])
if(length(gapsize) > 2) {
middletics<-which(xtics >= gap[2] + xgw[1] & xtics <= gap[3])
bigtics<-which(xtics > gap[4]+xgw[1]+xgw[3])
show.at<-c(xtics[littletics],xtics[middletics]-gapsize[1],
xtics[bigtics]-(gapsize[1]+gapsize[3]))
show.labels<-c(xticlab[littletics],xticlab[middletics],xticlab[bigtics])
}
else {
bigtics<-which(xtics > gap[2]+xgw)
show.at<-c(xtics[littletics],xtics[bigtics]-gapsize[1])
show.labels<-c(xticlab[littletics],xticlab[bigtics])
}
if(stax) {
axis(1,at=show.at,labels=rep("",length(show.labels)))
staxlab(1,at=show.at,labels=show.labels)
}
else axis(1,at=show.at,labels=show.labels)
axis.break(1,gap[1],style=style)
if(length(gapsize) > 2) {
axis.break(1,gap[3]-gapsize[1],style=style)
points(x[middleones]-gapsize[1],y[middleones],
lty=lty[middleones],col=col[middleones],pch=pch[middleones],...)
points(x[bigones]-(gapsize[1]+gapsize[3]),y[bigones],
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
else points(x[bigones]-gapsize[1],y[bigones],
lty=lty[bigones],col=col[bigones],pch=pch[bigones],...)
}
}
}
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