Nothing
### Arrows.R
Arrows <- function (x1, y1, x2, y2,
size = 1,
width = 1.2/4/cin,
open = TRUE,
sh.adj = 0.1,
sh.lwd = 1,
sh.col = par("fg"),
sh.lty = 1,
h.col = sh.col,
h.col.bo = sh.col,
h.lwd = sh.lwd,
h.lty = sh.lty,
verbose = FALSE)
## Author: Andreas Ruckstuhl, refined by Rene Locher
## Version: 2024-02-06
{
arr <- ((x2-x1)^2+(y2-y1)^2) > (10*.Machine$double.eps)
if (any(!arr)) {
warning("Some of the arrows have undefined directions and are therefore not drawn.\n")
x1 <- x1[arr]
x2 <- x2[arr]
y1 <- y1[arr]
y2 <- y2[arr]
}
cin <- size * par("cin")[2]
uin <- 1/xyinch()
x <- sqrt(seq(0, cin^2, length.out = floor(35 * cin) + 2))
delta <- sqrt(h.lwd)*par("cin")[2]*0.005
x.arr <- c(-rev(x), -x)
wx2 <- width * x^2
y.arr <- c(-rev(wx2 + delta), wx2 + delta)
deg.arr <- c(atan2(y.arr, x.arr), NA)
r.arr <- c(sqrt(x.arr^2 + y.arr^2), NA)
theta <- atan2((y2 - y1) * uin[2], (x2 - x1) * uin[1])
lx <- length(x1)
Rep <- rep(length(deg.arr), lx)
p.x2 <- rep(x2, Rep)
p.y2 <- rep(y2, Rep)
ttheta <- rep(theta, Rep) + rep(deg.arr, lx)
r.arr <- rep(r.arr, lx)
if(open) lines((p.x2 + r.arr * cos(ttheta)/uin[1]),
(p.y2 + r.arr*sin(ttheta)/uin[2]),
lwd=h.lwd, col = h.col.bo, lty=h.lty) else
polygon(p.x2 + r.arr * cos(ttheta)/uin[1], p.y2 + r.arr*sin(ttheta)/uin[2],
col = h.col, lwd=h.lwd,
border=h.col.bo, lty=h.lty)
r.seg <- rep(cin*sh.adj, lx)
th.seg <- theta + rep(atan2(0, -cin), lx)
segments(x1, y1, x2+r.seg*cos(th.seg)/uin[1], y2+r.seg*sin(th.seg)/uin[2],
lwd=sh.lwd, col=sh.col, lty=sh.lty)
if(verbose) return(list(width=width))
} # Arrows
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