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#
# fields is a package for analysis of spatial data written for
# the R software environment.
# Copyright (C) 2024 Colorado School of Mines
# 1500 Illinois St., Golden, CO 80401
# Contact: Douglas Nychka, douglasnychka@gmail.com,
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the R software environment if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# or see http://www.r-project.org/Licenses/GPL-2
##END HEADER
"drape.plot" <- function(x, y, z, z2 = NULL, col = tim.colors(64),
zlim = range(z, na.rm = TRUE), zlim2 = NULL, add.legend = TRUE,
horizontal = TRUE, theta = 30, phi = 20, breaks = NA, ...) {
#
# Thanks to JiHO for making corrections and useful extensions to this function
#
# if x is a list, discard y and z and extract them from x
if (is.list(x)) {
z <- x$z
y <- x$y
x <- x$x
}
NC <- length(col)
M <- nrow(z)
N <- ncol(z)
# if z2 is passed ( values for coloring facets ) use it
# if not use the z matrix that is also used to draw the
# perspective plot.
if (!is.null(z2)) {
M2 <- nrow(z2)
N2 <- ncol(z2)
if ((M != M2) | (N != N2)) {
stop("draping matrix dimensions must match z")
}
}
else {
z2 <- z
}
# if zlim2 has not been passed, set reasonable limits.
# if z2 is passed, set it to the range of z2
# if z2 is not passed, z2=z so we set it to the range of z (equal to zlim)
if (is.null(zlim2)) {
zlim2 <- range(c(z2), na.rm = TRUE)
}
# determine the colors for facets based on z2, the color scale and
# the zlim2 z limits
drape.info <- drape.color(z2, col = col, zlim = zlim2, breaks = breaks)
# draw filled wireframe and save perspective information
pm <- persp(x, y, z, theta = theta, phi = phi, col = drape.info$color.index,
zlim = zlim, ...)
# Note that zlim2 defines limits of color scale
if (add.legend) {
image.plot(zlim = zlim2, legend.only = TRUE, col = col,
horizontal = horizontal, breaks = drape.info$breaks)
}
# return pm if an assignment is made (see help file)
invisible(pm)
}
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