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## =============================================================================
## Contours in 3-D
## =============================================================================
createsegms <- function (x, y, z, colvar, names = c("x", "y", "z"),
dot, col, clim, dDepth, plist, levels, addbox) {
contour <- list(args = dot$points)
contour$args$col <- col
contour$args$levels <- levels
if (!ispresent(colvar))
stop ("'colvar' should be present for contour3D")
if (is.null(x))
x <- seq(0, 1, length.out = nrow(colvar))
if (is.null(y))
y <- seq(0, 1, length.out = ncol(colvar))
if (is.array(x) & length(dim(x)) == 1)
x <- as.vector(x)
if (is.array(y) & length(dim(y)) == 1)
y <- as.vector(y)
if (! is.vector(x))
stop(names[1], " should be a vector")
if (length(x) != nrow(colvar))
stop (names[1], " should be a vector of length = nrow(colvar) or be NULL")
if (! is.vector(y))
stop(names[2], " should be a vector")
if (length(y) != ncol(colvar))
stop (names[2], " should be a vector of length = ncol(colvar) or be NULL")
if (! is.matrix(z)) {
if (length(z) > 1)
stop("'z' should be a matrix or one value")
contour$side <- z
z <- colvar
} else {
if (length(x) != nrow(z))
stop(names[1], " should be of length = nrow(",names[3],")")
if (length(y) != ncol(z))
stop(names[2], " should be of length = ncol(",names[3],")")
contour$side <- "z"
}
# create contours
segm <- contourfunc(contour, x, y, z, plist, cv = colvar,
clim = clim, dDepth = dDepth, addbox = addbox)
names.from <- paste(names, ".from", sep = "")
names.to <- paste(names, ".to", sep = "")
names(segm)[1:6] <- c(names.from[1], names.to[1],
names.from[2], names.to[2],
names.from[3], names.to[3])
return(segm)
}
## =============================================================================
## main function
## =============================================================================
contour3D <- function(x = NULL, y = NULL, z = NULL, ...,
colvar = NULL, phi = 40, theta = 40,
col = NULL, colkey = NULL,
panel.first = NULL,
clim = NULL, clab = NULL, bty = "b",
dDepth = 1e-1, addbox = TRUE,
add = FALSE, plot = TRUE){
xlim <- ylim <- zlim <- c(0, 1)
if (!is.null(x))
xlim <- range(x, na.rm = TRUE)
if (!is.null(y))
ylim <- range(y, na.rm = TRUE)
if (!is.null(z))
zlim <- range(z, na.rm = TRUE)
plist <- initplist(add)
dot <- splitdotpersp(list(...), bty, FALSE, xlim, ylim, zlim,
plist = plist, breaks = NULL)
dots <- dot$points
levels <- dots$levels
dots$levels <- NULL
if (is.null(clim))
clim <- range(colvar, na.rm = TRUE)
clog <- FALSE
if (! is.null(dots$log)) {
if (length(grep("c", dots[["log"]])) > 0) {
dots[["log"]] <- gsub("c", "", dots[["log"]])
clog <- TRUE
}
if (dots[["log"]] == "")
dots[["log"]] <- NULL
}
if (clog) {
colvar <- log(colvar)
clim <- log(clim)
}
if (is.null(levels)) {
nlevs <- dots$nlevels
if (is.null(nlevs))
nlevs <- 10
if (clog)
levels <- exp(pretty(log(clim), nlevs))
else
levels <- pretty(clim, nlevs)
}
nlevs <- length(levels)
if (is.null(col))
col <- jet.col(nlevs)
if (! is.null(dot$alpha))
col <- setalpha(col, dot$alpha)
iscolkey <- is.colkey(colkey, col)
if (iscolkey)
colkey <- check.colkey(colkey)
if (is.null(plist)) {
do.call("perspbox", c(alist(xlim, ylim, zlim,
phi = phi, theta = theta, plot = plot,
colkey = colkey, col = col), dot$persp))
plist <- getplist()
}
if (is.function(panel.first))
panel.first(plist$mat)
isconstant <- NULL
ismatrix <- NULL
if (length(x) == 1)
isconstant <- c(isconstant, 1)
else if (is.matrix(x))
ismatrix <- c(ismatrix, 1)
if (length(y) == 1)
isconstant <- c(isconstant, 2)
else if (is.matrix(y))
ismatrix <- c(ismatrix, 2)
if (length(z) == 1)
isconstant <- c(isconstant, 3)
else if (is.matrix(z))
ismatrix <- c(ismatrix, 3)
if (length(isconstant) > 1)
stop ("only one of the values 'x' 'y', or 'z' can be one value")
if (length(ismatrix) > 1)
stop ("only one of the values 'x' 'y', or 'z' can be a matrix")
if (length(isconstant) > 1)
stop ("only one of the values 'x' 'y', or 'z' can be one value")
if (length(ismatrix) == 0 & length(isconstant) == 0)
stop ("exactly one of the values 'x' 'y', or 'z' should be a matrix or one value")
ismapped <- c(isconstant, ismatrix)
if (ismapped == 3) {
segm <- createsegms(x, y, z, colvar, c("x", "y", "z"), dot,
col, clim, dDepth, plist, levels, addbox)
} else if (ismapped == 1) {
segm <- createsegms(y, z, x, colvar, c("y", "z", "x"), dot,
col, clim, dDepth, plist, levels, addbox)
} else {
segm <- createsegms(x, z, y, colvar, c("x", "z", "y"), dot,
col, clim, dDepth, plist, levels, addbox)
}
if (iscolkey) {
if (is.null(colkey$at))
colkey$at <- levels
if (nlevs > 1) {
# for colors:
dz <- c(-diff(levels[1:2]), diff(levels[(nlevs-1):nlevs])) * 0.5
clim <- range(levels) + dz
}
plist <- plistcolkey(plist, colkey, col, clim, clab,
dot$clog, type = "contour3D", breaks = NULL)
}
plist <- plot_struct_3D(plist, segm = segm, plot = plot)
setplist(plist)
invisible(plist$mat)
}
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