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#' Rescale the size of a node to make it relative to the aspectt ratio of the device
#' @param size Numeric vector. Size of the node (radious).
#' @param rel Numeric vector of length 3. Relative size for the minimum and maximum
#' of the plot, and curvature of the scale. The third number is used as `size^rel[3]`.
#'
#' @details
#' This function is to be called after [plot.new], as it takes the parameter `usr`
#' from the
#' @noRd
rescale_size <- function(size, rel=c(.01, .05, 1)) {
# Checking the rel size
if (length(rel) == 2)
rel <- c(rel, 1)
else if (length(rel) > 3) {
warning("`rel` has more than 3 elements. Only the first 3 will be used.")
} else if (length(rel) < 2) {
stop("`rel` must be at least of length 2 and at most of length 3.")
}
# Creating curvature
size <- size^rel[3]
# Rescaling to be between range[1], range[2]
sran <- range(size, na.rm=TRUE)
if ((sran[2] - sran[1]) > 1e-5)
size <- (size - sran[1])/(sran[2] - sran[1]) # 0-1
else
size <- size/sran[1]
size * (rel[2] - rel[1]) + rel[1]
}
#' Adjust coordinates to fit aspectt ratio of the device
#' @param coords Two column numeric matrix. Vertices coordinates.
#' @details
#' It first adjusts `coords` to range between `-1,1`, and then, using
#' `graphics::par("pin")`, it rescales the second column of it (`y`) to adjust
#' for the device's aspect ratio.
#' @param adj Numeric vector of length 2.
#' @noRd
# @export
fit_coords_to_dev <- function(coords, adj = dev_size()) {
# Making it -1 to 1
yran <- range(coords[,2], na.rm = TRUE)
xran <- range(coords[,1], na.rm = TRUE)
coords[,1] <- (coords[,1] - xran[1])/(xran[2] - xran[1])*2 - 1
coords[,2] <- (coords[,2] - yran[1])/(yran[2] - yran[1])*2 - 1
# Adjusting aspectt ratio according to the ploting area
coords[,2] <- coords[,2]*adj[2]/adj[1]
# Returning new coordinates
coords
}
#' Rotation of polygon
#' @param mat Two-column numeric matrix. Coordinates of the polygon.
#' @param origin Numeric vector of length two. Origin.
#' @param alpha Numeric scalar. Rotation degree in radians.
#' @noRd
# @export
rotate <- function(mat, origin, alpha) {
R <- matrix(
c(cos(alpha), -sin(alpha), sin(alpha), cos(alpha)),
nrow = 2, byrow = TRUE)
origin <- matrix(c(origin[1], origin[2]), ncol=2, nrow = nrow(mat), byrow = TRUE)
t(R %*% t(mat - origin)) + origin
}
#' Arc between two nodes
#'
#' @param p0,p1 Numeric vector of length 2. Center coordinates
#' @param alpha Numeric scalar. Arc angle in radians.
#' @param n Integer scalar. Number of segments to approximate the arc.
#' @param radii Numeric vector of length 2. Radious
#' @noRd
# @export
#'
arc <- function(
p0,
p1,
alpha = pi/3,
n = 10L,
radii = c(0, 0)
) {
# If no curve, nothing to do (old fashioned straight line)
if (alpha == 0 | n == 1) {
alpha <- 1e-5
}
elevation <- atan2(p1[2]-p0[2], p1[1] - p0[1])
# Constants
d <- sqrt(sum((p0 - p1)^2))
# If overlapping, then fix the radius to be the average
if ((d - sum(radii)) < 0) {
r <- mean(radii)
alpha <- 2*pi - asin(d/2/r)*2
} else {
r <- d/2/(sin(alpha/2))
}
# Angles
alpha0 <- asin(radii[1]/2/r)*2
alpha1 <- asin(radii[2]/2/r)*2
# Angle range
alpha_i <- seq(
pi/2 + (alpha/2 - alpha0) ,
pi/2 - (alpha/2 - alpha1),
length.out = n + 1
)
# Middle point
M <- c(
p0[1] + d/2,
p0[2] - cos(alpha/2)*r
)
ans <- cbind(
M[1] + cos(alpha_i)*r,
M[2] + sin(alpha_i)*r
)
# Rotation and return
ans <- rotate(ans, p0, elevation)
# Separating the segments
ans <- cbind(
as.vector(t(cbind(ans[-(n + 1),1], ans[-1,1]))),
as.vector(t(cbind(ans[-(n + 1),2], ans[-1,2])))
)
structure(
ans,
alpha0 = atan2(ans[1,2] - p0[2], ans[1,1] - p0[1]),
alpha1 = atan2(p1[2] - ans[n*2,2], p1[1] - ans[n*2,1]),
midpoint = ans[ceiling(n/2),]
)
}
#' Arrow polygon.
#'
#' @param x Numeric vector of length 2. Coordinates of the tip
#' @param alpha,l,a,b Numeric scalars
#' @noRd
# @export
arrow_fancy <- function(x, alpha = 0, l=.25, a=pi/6, b = pi/1.5) {
p_left <- x + c(-cos(a), sin(a))*l
base <- l*sin(a)
base2 <- base * cos(pi - b)/sin(pi - b)
p_mid <- p_left + c(base2, -base)
p_right <- x - c(cos(a), sin(a))*l
ans <- rbind(x, p_left, p_mid, p_right)
# Rotation
rotate(ans, x, alpha = alpha)
}
#' Takes a graph attribute and maps it to a shape
#' @param x Is (any) vector to be mapped.
#' @return
#' A vector of shapes (encoded as integers) from 2 to 8.
#' @noRd
map_attribute_to_shape <- function(x) {
# Get the unique values of x, if it is more than 9
# then we will throw an error.
nunique <- length(unique(x))
if (nunique > length(sides_lookup)) {
stop(
"The number of unique values of the attribute is greater than the number of shapes available. ",
"Please, use a different attribute or a different shape."
)
}
# If the variable already contains the values
if (all(x %in% names(sides_lookup)))
return(x)
# We can now turn this x into a factor, and then
# numbers to be used as indices
names(sides_lookup)[as.numeric(factor(x))]
}
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