.longitude2Center = function(x, ...) {
if (!any(x > 180, na.rm=TRUE))
return(x)
x[which(x > 180)] = x[which(x > 180)] - 360
return(x)
}
.longitude2Left = function(x, ...) {
if (!any(x < 0, na.rm=TRUE))
return(x)
x[which(x < 0)] = x[which(x < 0)] + 360
return(x)
}
checkLongitude = function(x, primeMeridian="center", ...) {
if(all(is.na(x))) return(x)
out = switch(primeMeridian,
center = .longitude2Center(x, ...),
left = .longitude2Left(x, ...))
return(out)
}
.findPrimeMeridian = function(x) {
if(all(is.na(x))) return("center")
if(any(x<0)) return("center")
if(any(x>180)) return("left")
return("center")
}
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