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# $Id: vgm.panel.q,v 1.7 2007-06-08 06:45:52 edzer Exp $
"get.direction.unitv" <- function(alpha, beta) {
cb = cos(beta)
c(cb * sin(alpha), cb * cos(alpha), sin(beta))
}
"vgm.panel.xyplot" <-
function (x, y, subscripts, type = "p", pch = plot.symbol$pch,
col, col.line = plot.line$col, col.symbol = plot.symbol$col,
lty = plot.line$lty, cex = plot.symbol$cex, ids, lwd = plot.line$lwd,
model = model, direction = direction, labels, shift = shift, mode = mode, ...)
{
x <- as.numeric(x)
y <- as.numeric(y)
if (length(x) > 0) {
if (!missing(col)) {
if (missing(col.line))
col.line <- col
if (missing(col.symbol))
col.symbol <- col
}
plot.symbol <- trellis.par.get("plot.symbol")
plot.line <- trellis.par.get("plot.line")
lpoints(x = x, y = y, cex = cex, col = col.symbol, pch = pch, type = type, ...)
if (!is.null(labels))
ltext(x = x + shift * max(x), y = y, labels = labels[subscripts])
if (mode == "direct") {
if (!missing(model) && !is.null(model)) {
ang.hor <- pi * (direction[1]/180)
ang.ver <- pi * (direction[2]/180)
dir <- get.direction.unitv(ang.hor, ang.ver)
ret <- variogramLine(model, max(x), dir = dir)
llines(x = ret$dist, y = ret$gamma, lty = lty, col = col.line, lwd = lwd)
}
} else if (mode == "cross") {
id <- as.character(ids[subscripts][1])
if (!missing(model) && !is.null(model)) {
if (inherits(model, "gstat"))
m = model$model
else
m = model
if (!is.list(m))
stop("model argument not of class gstat or list")
if (is.list(m) && !is.null(m[[id]])) {
ang.hor <- pi * (direction[1]/180)
ang.ver <- pi * (direction[2]/180)
dir <- get.direction.unitv(ang.hor, ang.ver)
ret <- variogramLine(m[[id]], max(x), dir = dir)
llines(x = ret$dist, y = ret$gamma, lty = lty, col = col.line, lwd = lwd)
}
}
} else if (mode == "directional") {
if (!missing(model) && !is.null(model)) {
dir <- c(1, 0, 0)
if (!missing(direction)) {
ang.hor <- pi * (direction[subscripts][1]/180.0)
dir <- get.direction.unitv(ang.hor, 0)
}
ret <- variogramLine(model, max(x), dir = dir)
llines(x = ret$dist, y = ret$gamma, lty = lty, col = col.line, lwd = lwd)
}
}
}
}
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