Nothing
"dia.arrow" <- function (from, to, labels = NULL, scale = 1, cex = 1, adj = 2,
both = FALSE, pos = NULL, l.cex, gap.size = NULL, draw = TRUE,
col = "black", lty = "solid", ...)
{
if (missing(gap.size))
gap.size <- 0.2
if (missing(l.cex))
l.cex <- cex
text.values <- NULL
radius1 <- radius2 <- 0
if (!is.list(to)) {
tocenter <- to
}
else {
tocenter <- to$center
}
if (is.list(from)) {
if (!is.null(from$radius)) {
radius1 <- from$radius
radius2 <- 0
}
if (!is.null(from$center))
from <- from$center
}
if (is.list(to)) {
if (!is.null(to$radius)) {
radius2 <- to$radius
to <- to$center
}
}
theta <- atan((from[2] - to[2])/(from[1] - to[1]))
costheta <- cos(theta)
sintheta <- sin(theta)
dist <- sqrt((to[1] - from[1])^2 + (to[2] - from[2])^2)
if ((adj > 3) || (adj < 1)) {
x <- (to[1] + from[1])/2
y <- (to[2] + from[2])/2
}
else {
x <- from[1] - sign(from[1] - to[1] + 0.001) * (4 - adj) *
costheta * dist/4
y <- from[2] - sign(from[1] - to[1] + 0.001) * (4 - adj) *
sintheta * dist/4
}
if (is.null(labels)) {
h.size <- 0
}
else {
h.size <- nchar(labels) * cex * gap.size
}
if (is.null(labels)) {
v.size <- 0
}
else {
v.size <- cex * 0.7 * gap.size
}
if (from[1] < to[1]) {
h.size <- -h.size
radius1 <- -radius1
radius2 <- -radius2
}
x0 <- from[1] - costheta * radius1
xr <- x + h.size * costheta * v.size
y0 <- from[2] - sintheta * radius1
xl <- x - h.size * costheta * v.size
yr <- y + v.size * sintheta * h.size
yl <- y - v.size * sintheta * h.size
xe <- to[1] + costheta * radius2
ye <- to[2] + sintheta * radius2
if (!is.null(labels)) {
if (draw) {
text(x, y, labels, cex = l.cex, pos = pos, ...)
text.values <- NULL
}
else {
if (is.null(pos))
pos <- 0
text.values <- c(x, y, labels, pos = pos, cex = l.cex)
}
}
if (draw) {
arrows(x0, y0, xr, yr, length = (both + 0) * 0.1 * scale,
angle = 30, code = 1, col = col, lty = lty, ...)
arrows(xl, yl, xe, ye, length = 0.1 * scale, angle = 30,
code = 2, col = col, lty = lty, ...)
arrow.values <- NULL
}
else {
arrow.values <- list(x0, y0, xr, yr, length = (both +
0) * 0.1 * scale, angle = 30, code = 1, xl, yl, xe,
ye, length2 = 0.1 * scale, angle2 = 30, code2 = 2,
col = col, lty = lty, ...)
}
invisible(list(text.values = text.values, arrow.values = arrow.values))
}
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