Nothing
mysign <- function(x){
out <- rep(1,length(x))
out[x<0] <- -1
out
}
# This uses the ray-casting algorithm to decide whether the point is inside
# the given polygon. See https://en.wikipedia.org/wiki/Point_in_polygon
inside <- function(pts,pol){
nv <- nrow(pol)
if (identical(pol[1,],pol[nv,])){
pol <- pol[-1,] # remove the duplicate vertex
nv <- nv - 1
}
if ('matrix' %in% class(pts)){
np <- nrow(pts)
x <- pts[,1]
y <- pts[,2]
} else {
np <- 1
x <- pts[1]
y <- pts[2]
}
igood <- which(!(is.na(x)|is.na(y)))
out <- rep(FALSE,np)
for (i in 1:nv){
j <- i %% nv + 1
xp0 <- pol[i,1]
yp0 <- pol[i,2]
xp1 <- pol[j,1]
yp1 <- pol[j,2]
crosses <- (yp0 <= y) & (yp1 > y) | (yp1 <= y) & (yp0 > y)
if (any(crosses[igood])){
icrosses <- igood[which(crosses[igood])]
cross <- (xp1 - xp0) * (y[icrosses] - yp0) / (yp1 - yp0) + xp0
change <- icrosses[cross < x[icrosses]]
out[change] <- !out[change]
}
}
out
}
#' @title colour plot
#' @description Adds a colour bar to a scatter plot and/or filled
#' contour plot. This function, which is based on base \code{R}'s
#' \code{filled.contour} function, is useful for visualising
#' kriging results.
#' @param x numerical vector of \eqn{n} equally spaced values to be
#' used in the contour plot.
#' @param y numerical vector of \eqn{m} equally spaced values to be
#' used in the contour plot.
#' @param z an \eqn{n \times m} matrix of numerical values to be used
#' in the contour plot.
#' @param X numerical vector of \eqn{N} values to be used in the
#' scatter plot.
#' @param Y numerical vector of \eqn{N} values to be used in the
#' scatter plot.
#' @param Z numerical vector of \eqn{N} values to be used in the
#' scatter plot.
#' @param nlevels number of levels to be used in the contour plot.
#' @param colspec colour specification (e.g., \code{rainbow},
#' \code{grey.colors}, \code{heat.colors}, \code{topo.colors}).
#' @param pch plot character (\code{21} -- \code{25}).
#' @param cex plot character magnification.
#' @param plot.title statements that add titles to the main plot.
#' @param plot.axes statements that draw axes on the main plot. This
#' overrides the default axes.
#' @param key.title statements that add titles for the plot key.
#' @param key.axes statements that draw axes on the plot key. This
#' overrides the default axis.
#' @param asp the y/x aspect ratio, see \code{plot.window}.
#' @param xaxs the x axis style. The default is to use internal
#' labelling.
#' @param yaxs the y axis style. The default is to use internal
#' labelling.
#' @param las the style of labelling to be used. The default is to
#' use horizontal labelling.
#' @param axes logicals indicating if axes should be drawn.
#' @param frame.plot logicals indicating if a box should be drawn, as
#' in \code{plot.default}.
#' @param extra (optional) extra intructions to be carried out in the
#' main plot window, such as text annotations.
#' @param ... additional graphical parameters
#' @return no return value
#' @import grDevices
#' @import graphics
#' @examples
#' data('meuse',package='geostats')
#' colourplot(X=meuse$x,Y=meuse$y,Z=log(meuse$zinc),
#' plot.title=title(main='Meuse',xlab='Easting',ylab='Northing'),
#' key.title=title(main='log(Zn)'))
#' @export
colourplot <- function (x, y, z, X, Y, Z, nlevels=20, colspec=hcl.colors,
pch = 21, cex = 1, plot.title, plot.axes, key.title,
key.axes, asp = NA, xaxs = "i", yaxs = "i",
las = 1, axes = TRUE, frame.plot = axes, extra, ...) {
cnts <- !(missing(x)|missing(y)|missing(z))
pnts <- !(missing(X)|missing(Y)|missing(Z))
if (cnts){
xX <- x
yY <- y
zZ <- z
if (any(diff(x) <= 0) || any(diff(y) <= 0))
stop("increasing 'x' and 'y' values expected")
} else {
xX <- NULL
yY <- NULL
zZ <- NULL
}
if (pnts){
xX <- c(xX,X)
yY <- c(yY,Y)
zZ <- c(zZ,Z)
}
if (!pnts & !cnts){
stop('Both x,y,z and X,Y,Z are missing.')
}
xlim <- range(xX,finite=TRUE)
ylim <- range(yY,finite=TRUE)
zlim <- range(zZ,finite=TRUE)
# add a bit of padding
dx <- diff(xlim)
dy <- diff(ylim)
dz <- diff(zlim)
xlim <- xlim + dx*c(-1,1)/20
ylim <- ylim + dy*c(-1,1)/20
zlim <- zlim + dz*c(-1,1)/100
levels <- seq(from=zlim[1],to=zlim[2],length.out=nlevels)
dl <- diff(zlim)
levcol <- colspec(nlevels)
if (pnts){
ci <- ceiling(nlevels*(Z-levels[1])/dl)
ptscol <- levcol[ci]
}
mar.orig <- (par.orig <- par(c("mar", "las", "mfrow")))$mar
on.exit(par(par.orig))
w <- (3 + mar.orig[2L]) * par("csi") * 2.54
layout(matrix(c(2, 1), ncol = 2L), widths = c(1, lcm(w)))
par(las = las)
mar <- mar.orig
mar[4L] <- mar[2L]
mar[2L] <- 1
par(mar = mar)
plot.new()
plot.window(xlim = c(0, 1), ylim = range(levels), xaxs = "i", yaxs = "i")
rect(0, levels[-length(levels)], 1, levels[-1L], col = levcol)
if (missing(key.axes)) {
if (axes)
axis(4)
}
else key.axes
box()
if (!missing(key.title))
key.title
mar <- mar.orig
mar[4L] <- 1
par(mar = mar)
plot.new()
plot.window(xlim, ylim, "", xaxs = xaxs, yaxs = yaxs, asp = asp)
if (cnts){
.filled.contour(x, y, z, levels, levcol)
}
if (pnts){
points(X, Y, pch=pch, cex=cex, bg=ptscol)
}
if (!missing(extra)){
extra
}
if (missing(plot.axes)) {
if (axes) {
title(main = "", xlab = "", ylab = "")
Axis(xlim, side = 1)
Axis(ylim, side = 2)
}
}
else plot.axes
if (frame.plot)
box()
if (missing(plot.title))
title(...)
else plot.title
invisible()
}
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