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rgl.callback.env <- new.env(parent = emptyenv())
findSubscene <- function(subscene, id) {
if (subscene$id == id)
return(subscene)
subscenes <- subscene$subscenes
if (!is.null(subscenes)) {
for (i in seq_along(subscenes)) {
if (!is.null(result <- findSubscene(subscenes[[i]], id)))
return(result)
}
}
NULL
}
findBboxdeco <- function(scene, subscene, root = scene$rootSubscene, guess = NULL) {
active <- root
for (id in active$objects)
if (scene$objects[[as.character(id)]]$type == "bboxdeco")
guess <- id
if (active$id == subscene)
if (is.null(guess))
return(NULL)
else
return(scene$objects[[as.character(guess)]])
for (sub in active$subscenes)
if (!is.null(bbox <- findBboxdeco(scene, subscene, sub, guess)))
return(bbox)
return(NULL)
}
replaceSubscene <- function(subscene, id, newvalue) {
if (as.character(subscene$id) == id)
return(newvalue)
subscenes <- subscene$subscenes
if (!is.null(subscenes))
for (i in seq_along(subscenes))
if (!is.null(result <- replaceSubscene(subscenes[[i]], id, newvalue))) {
subscene$subscenes[[i]] <- result
return(subscene)
}
NULL
}
getfn <- function(fn, up = 2) {
if (is.character(fn))
result <- eval(parse(text = fn), envir = parent.frame(up))
else
result <- fn
if (!is.function(result))
stop(fn, " is not a function.")
result
}
setUserCallbacks <- function(button = NULL, begin = NULL, update = NULL, end = NULL,
rotate = NULL,
javascript = NULL,
subscene = scene$rootSubscene$id,
scene = scene3d(minimal = FALSE),
applyToScene = TRUE,
applyToDev = missing(scene)) {
force(applyToDev)
stopifnot(inherits(scene, "rglscene"))
subscene <- as.character(subscene)
sub <- findSubscene(scene$rootSubscene, subscene)
if (is.null(sub))
stop("subscene ", subscene, " not found.")
if (is.null(sub$par3d) || is.null(sub$par3d$mouseMode)
|| is.null(sub$embeddings))
stop("Internal error: subscene missing mouseMode or embeddings")
if (is.null(sub$callbacks))
sub$callbacks <- list()
if (!is.null(button)) {
if (is.numeric(button))
button <- c("none", "left", "right", "middle", "wheel")[button + 1]
sub$par3d$mouseMode[button] <- "user"
sub$callbacks[[button]] <- list(begin = begin, update = update,
end = end, rotate = rotate)
sub$embeddings["mouse"] <- "replace"
}
javascript <- paste(c(scene$javascript, javascript),
collapse = "\n")
if (applyToScene) {
scene$rootSubscene <- replaceSubscene(scene$rootSubscene,
subscene, sub)
scene$javascript <- javascript
}
if (applyToDev) {
dev <- cur3d()
devname <- paste0("dev", dev)
callbacks <- rgl.callback.env[[devname]]
if (is.null(callbacks))
callbacks <- list()
callbacks[[paste0("sub", subscene)]] <- sub$callbacks
callbacks$javascript <- javascript
rgl.callback.env[[devname]] <- callbacks
if (dev > 0) {
callbacks <- sub$callbacks
if (!is.null(button)) {
fns <- callbacks[[button]]
if (!is.null(fns)) {
for (f in c("begin", "update", "end", "rotate"))
if (!is.null(fns[[f]]))
fns[[f]] <- getfn(fns[[f]])
callbacks[[button]] <- fns
if (button == "wheel" && is.function(fns$rotate))
rgl.setWheelCallback(rotate = fns$rotate, dev = dev, subscene = subscene)
fns$rotate <- NULL
if (any(vapply(fns, is.function, TRUE)))
do.call(rgl.setMouseCallbacks,
c(list(button = c(none = 0, left = 1, right = 2, middle = 3, wheel = 4)[button],
dev = dev, subscene = subscene),
fns))
}
}
}
}
invisible(scene)
}
setAxisCallbacks <- function(axes, fns,
javascript = NULL,
subscene = scene$rootSubscene$id,
scene = scene3d(minimal = FALSE),
applyToScene = TRUE,
applyToDev = missing(scene)) {
force(applyToDev)
stopifnot(inherits(scene, "rglscene"))
subscene <- as.character(subscene)
if (!is.character(axes))
axes <- c("x", "y", "z")[axes]
else
axes <- tolower(axes)
stopifnot(all(axes %in% c("x", "y", "z")))
if (!is.list(fns))
fns <- list(fns)
n <- max(length(axes), length(fns))
axes <- rep(axes, length.out = n)
fns <- rep(fns, length.out = n)
# Call each function once to set things up before grabbing
# the scene
for (i in seq_len(n))
getfn(fns[[i]])(paste0(axes[i], "--"))
sub <- findSubscene(scene$rootSubscene, subscene)
if (is.null(sub))
stop("subscene ", subscene, " not found.")
bbox <- findBboxdeco(scene, subscene)
if (is.null(bbox))
stop("No bbox decoration found.")
if (is.null(bbox$callbacks))
bbox$callbacks <- list()
for (i in seq_len(n))
bbox$callbacks[[axes[i]]] <- fns[[i]]
javascript <- paste(c(scene$javascript, javascript),
collapse = "\n")
if (applyToScene) {
scene$objects[[as.character(bbox$id)]] <- bbox
scene$javascript <- javascript
}
if (applyToDev) {
dev <- cur3d()
devname <- paste0("dev", dev)
callbacks <- rgl.callback.env[[devname]]
if (is.null(callbacks))
callbacks <- list()
callbacks[[paste0("bbox", bbox$id)]] <- bbox$callbacks
callbacks$javascript <- javascript
rgl.callback.env[[devname]] <- callbacks
if (dev > 0) {
callbacks <- bbox$callbacks
for (i in seq_len(n)) {
fn <- getfn(fns[[i]])
axis <- match(axes[i], c("x", "y", "z"))
.Call(rgl_setAxisCallback, fn, as.integer(dev), as.integer(subscene), as.integer(axis - 1))
}
}
}
invisible(scene)
}
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