Nothing
expandedge <-
function(X,xwidth,ywidth,id=1:X$n){
stopifnot(spatstat::is.ppp(X))
x<-y<-NULL
df.X<-as.data.frame(X)
df.X.ppp<-spatstat::ppp(x=df.X$x,y=df.X$y,
xrange=X$window$xrange,yrange=X$window$yrange)
if(is.null(X$marks)){
df.X.ppp<-df.X.ppp
}else{
spatstat::marks(df.X.ppp)<-spatstat::marks(df.X.ppp)
}
if(xwidth>df.X.ppp$window$xrange[2]-df.X.ppp$window$xrange[1])
stop("xwidth beyond the xrange")
if(ywidth>df.X.ppp$window$yrange[2]-df.X.ppp$window$yrange[1])
stop("ywidth beyond the yrange")
totalX<-as.data.frame(cbind(x=df.X.ppp$x,y=df.X.ppp$y,df.X.ppp$marks,id))
s.totalX<-totalX
s.totalX$y<-s.totalX$y+ywidth
uparea<-subset(totalX,y<=df.X.ppp$window$yrange[1]+ywidth)
uparea$y<-uparea$y+(df.X.ppp$window$yrange[2]-df.X.ppp$window$yrange[1])
downarea<-subset(totalX,y>=df.X.ppp$window$yrange[2]-ywidth)
downarea$y<-downarea$y-(df.X.ppp$window$yrange[2]-df.X.ppp$window$yrange[1])
updown_area<-rbind(uparea,totalX,downarea)
s.updown_area<-updown_area
rightarea<-subset(updown_area,x<=df.X.ppp$window$xrange[1]+xwidth)
rightarea$x<-rightarea$x+(df.X.ppp$window$xrange[2]-df.X.ppp$window$xrange[1])
leftarea<-subset(updown_area,x>=df.X.ppp$window$xrange[2]-xwidth)
leftarea$x<-leftarea$x-(df.X.ppp$window$xrange[2]-df.X.ppp$window$xrange[1])
leftright_area<-data.frame(rbind(leftarea,s.updown_area,rightarea))
total_area<-as.data.frame(cbind(id=1:(nrow(leftarea)+nrow(rightarea)+nrow(updown_area)),old.id=leftright_area$id,leftright_area[-which(colnames(leftright_area)=="id")],row.names=NULL))
}
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