# fields, Tools for spatial data
# Copyright 2004-2011, Institute for Mathematics Applied Geosciences
# University Corporation for Atmospheric Research
# Licensed under the GPL -- www.gpl.org/licenses/gpl.html
"quilt.plot" <- function(x, y, z, nx=64, ny=64,nrow = nx, ncol = ny,
grid = NULL, add.legend = TRUE, add = FALSE, col = tim.colors(256),
...) {
#
# note that nrow and ncol refer to the resulting "image format" for plotting.
# here the x values are the rows and the y values are the columns
#
x <- as.matrix(x)
if (ncol(x) == 2) {
z <- y
}
if (ncol(x) == 1) {
x <- cbind(x, y)
}
if (ncol(x) == 3) {
z <- x[, 3]
x <- x[, 1:2]
}
# at this point x should be a 2 column matrix of x-y locations
# z is a vector or one column matrix of the z values.
#discretize data
out.p <- as.image(z, x = x, nrow = nrow, ncol = ncol,
na.rm = TRUE, grid=grid)
#plot it
if (add.legend) {
image.plot(out.p, col = col, add = add, ...)
}
else {
image(out.p, col = col, add = add, ...)
}
}