Nothing
#' @importFrom lattice lsegments
#' @importFrom lattice ltext
#' @importFrom rgl lines3d
#' @importFrom graphics segments
#' @importFrom graphics text
addarrow <- function(x0,y0,len,bearing,headlen=0.2*len,headangle=25,Nlabel=TRUE,
addto=c('rgl','plot','lattice'),...){
addto <- match.arg(addto)
bearing <- bearing * pi/180
headangle <- headangle * pi/180
x1 <- x0 - len*cos(bearing)
y1 <- y0 - len*sin(bearing)
x2 <- x1 + headlen*cos(headangle + bearing)
y2 <- y1 + headlen*sin(headangle + bearing)
x3 <- x1 + headlen*cos(headangle - bearing)
y3 <- y1 - headlen*sin(headangle - bearing)
if(addto=="rgl"){
lines3d(x = c(x0,x1), y=c(y0,y1), z=c(0,0), ...)
lines3d(x = c(x1,x2), y=c(y1,y2), z=c(0,0), ...)
lines3d(x = c(x1,x3), y=c(y1,y3), z=c(0,0), ...)
}
if(addto=="lattice"){
lsegments(x0,y0,x1,y1,...)
lsegments(x1,y1,x2,y2,...)
lsegments(x1,y1,x3,y3,...)
}
if(addto=="plot"){
segments(x0,y0,x1,y1,...)
segments(x1,y1,x2,y2,...)
segments(x1,y1,x3,y3,...)
}
if(Nlabel){
xN <- x0 + len*0.1*cos(bearing)
yN <- y0 + len*0.1*sin(bearing)
if(addto == "rgl")text3d(x=xN,y=yN,z=0,texts="N")
if(addto == "plot")text(x=xN,y=yN,labels="N")
if(addto == "lattice")ltext(x=xN,y=yN,labels="N")
}
}
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