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#' @importFrom grid grob is.unit unit gTree
cappedPathGrob <- function(x, y, id = NULL, id.lengths = NULL, arrow = NULL,
start.cap = NULL, start.cap2 = NULL, start.captype = 'circle',
end.cap = NULL, end.cap2 = NULL, end.captype = 'circle',
default.units = 'npc', name = NULL, gp = gpar(), vp = NULL, constant = TRUE) {
if (!is.unit(x)) {
x <- unit(x, default.units)
}
if (!is.unit(y)) {
y <- unit(y, default.units)
}
if (is.null(id)) {
if (!is.null(id.lengths)) {
id <- rep(seq_along(id.lengths), id.lengths)
} else {
id <- rep(1, length(x))
}
}
n <- length(unique0(id))
start.cap <- validate_cap(start.cap, default.units, n)
if (is.null(start.cap2)) {
start.cap2 <- start.cap
} else {
start.cap2 <- validate_cap(start.cap2, default.units, n)
}
end.cap <- validate_cap(end.cap, default.units, n)
if (is.null(end.cap2)) {
end.cap2 <- end.cap
} else {
end.cap2 <- validate_cap(end.cap2, default.units, n)
}
if (!all(c(start.captype, end.captype) %in% c('circle', 'rect'))) {
cli::cli_abort('{.arg captype} must be either {.val circle} or {.val rect}', call. = FALSE)
}
start.captype <- rep(start.captype, length.out = n)
end.captype <- rep(end.captype, length.out = n)
n_points <- length(x)
group_diff <- id[-1] != id[-n_points]
start <- c(TRUE, group_diff)
end <- c(group_diff, TRUE)
if (constant) {
gp <- lapply(gp, function(par) {
if (length(par) == length(end)) {
par[start]
} else {
par
}
})
} else {
gp <- lapply(gp, function(par) {
if (length(par) == length(end)) {
par[!end]
} else {
par
}
})
}
class(gp) <- 'gpar'
if (is.null(start.cap) && is.null(end.cap)) {
if (constant) {
grob(
x = x, y = y, id = id, id.lengths = NULL, arrow = arrow,
name = name, gp = gp, vp = vp, cl = 'polyline'
)
} else {
grob(
x0 = x[!end], y0 = y[!end], x1 = x[!start], y1 = y[!start], id = id[!end],
arrow = arrow, name = name, gp = gp, vp = vp, cl = 'segments'
)
}
} else {
gTree(
x = x, y = y, id = id, arrow = arrow, constant = constant, start = start, end = end,
start.cap = start.cap, start.cap2 = start.cap2, start.captype = start.captype,
end.cap = end.cap, end.cap2 = end.cap2, end.captype = end.captype,
name = name, gp = gp, vp = vp, cl = 'cappedpathgrob'
)
}
}
#' Dynamic capping of paths
#'
#' This function takes care of updating which parts of the paths get removed
#' when the device dimensions are updated.
#'
#' @importFrom grid convertX convertY convertWidth convertHeight unit grob makeContent setChildren gList
#' @export
#' @keywords internal
makeContent.cappedpathgrob <- function(x) {
x_new <- convertX(x$x, 'mm', TRUE)
y_new <- convertY(x$y, 'mm', TRUE)
start.cap <- convertWidth(x$start.cap, 'mm', TRUE)
end.cap <- convertWidth(x$end.cap, 'mm', TRUE)
start.cap2 <- convertHeight(x$start.cap2, 'mm', TRUE)
end.cap2 <- convertHeight(x$end.cap2, 'mm', TRUE)
truncated <- cut_lines(
x_new, y_new, as.integer(x$id), start.cap, start.cap2,
end.cap, end.cap2, x$start.captype, x$end.captype
)
keep <- !is.na(truncated$x)
if (!any(keep)) {
lines <- zeroGrob()
} else if (x$constant) {
x_new <- truncated$x[keep]
y_new <- truncated$y[keep]
id <- x$id[keep]
all_id <- unique0(id)
gp <- lapply(x$gp, function(par) {
if (length(par) == 1) {
par
} else {
par[all_id]
}
})
class(gp) <- 'gpar'
id <- match(id, all_id)
lines <- grob(
x = unit(x_new, 'mm'), y = unit(y_new, 'mm'), id = id,
id.lengths = NULL, arrow = x$arrow, name = x$name, gp = gp,
vp = x$vp, cl = 'polyline'
)
} else {
x0 <- truncated$x[!x$end]
y0 <- truncated$y[!x$end]
x1 <- truncated$x[!x$start]
y1 <- truncated$y[!x$start]
lines <- grob(
x0 = unit(x0, 'mm'), y0 = unit(y0, 'mm'), x1 = unit(x1, 'mm'), id = x$id[!x$end],
y1 = unit(y1, 'mm'), arrow = x$arrow, name = x$name, gp = x$gp,
vp = x$vp, cl = 'segments'
)
}
setChildren(x, gList(lines))
}
#' @importFrom grid is.unit unit
validate_cap <- function(cap, default.units, n) {
if (is.null(cap)) {
return()
}
if (!is.unit(cap)) cap <- unit(cap, default.units)
rep(cap, length.out = n)
}
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