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Function to plot a segments plot copied and modified from kohonen package.
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# Copying the kohonen:::plot.kohcodes routine, for equivalent kmeans stars diagram | |
plot.centers <- function (x, main) | |
{ | |
palette.name <- terrain.colors | |
codes <- x$codes | |
nvars <- ncol(codes) | |
maxlegendcols <- 3 | |
codeRendering <- "segments" | |
margins <- rep(0.6, 4) | |
if (!is.null(main)) | |
margins[3] <- margins[3] + 2 | |
par(mar = margins) | |
if (codeRendering == "segments" & nvars < 15 & !is.null(colnames(codes))) { | |
plot(x$grid, ylim = c(max(x$grid$pts[, 2]) + min(x$grid$pts[, 2]), -2)) | |
current.plot <- par("mfg") # only needed when multiple plots | |
plot.width <- diff(par("usr")[1:2]) | |
cex <- 1 | |
leg.result <- legend(x = mean(x$grid$pts[, 1]), xjust = 0.5, | |
y = 0, yjust = 1, legend = colnames(codes), cex = cex, | |
plot = FALSE, ncol = min(maxlegendcols, nvars), | |
fill = palette.name(nvars)) | |
while (leg.result$rect$w > plot.width) { # is it too wide? | |
cex <- cex * 0.9 | |
leg.result <- legend(x = mean(x$grid$pts[, 1]), | |
xjust = 0.5, y = 0, yjust = 1, legend = colnames(codes), | |
cex = cex, plot = FALSE, ncol = min(maxlegendcols, nvars), | |
fill = palette.name(nvars)) | |
} | |
leg.result <- legend(x = mean(x$grid$pts[, 1]), xjust = 0.5, | |
y = 0, yjust = 1, cex = cex, legend = colnames(codes), | |
plot = FALSE, ncol = min(maxlegendcols, nvars), | |
fill = palette.name(nvars)) | |
par(mfg = current.plot) | |
plot(x$grid, ylim = c(max(x$grid$pts[, 2]) + min(x$grid$pts[, 2]), -leg.result$rect$h)) | |
legend(x = mean(x$grid$pts[, 1]), xjust = 0.5, y = 0, | |
yjust = 1, cex = cex, plot = TRUE, legend = colnames(codes), | |
ncol = min(maxlegendcols, nvars), fill = palette.name(nvars)) | |
} | |
else { | |
plot(x$grid) | |
} | |
title.y <- max(x$grid$pts[, 2]) + 1.2 | |
if (title.y > par("usr")[4] - 0.2) { | |
title(main) | |
} | |
else { | |
text(mean(range(x$grid$pts[, 1])), title.y, main, | |
adj = 0.5, cex = par("cex.main"), font = par("font.main")) | |
} | |
bgcol <- "transparent" | |
symbols(x$grid$pts[, 1], x$grid$pts[, 2], | |
circles = rep(0.5, nrow(x$grid$pts)), inches = FALSE, add = TRUE, bg = bgcol) | |
codemins <- apply(codes, 2, min) | |
codes <- sweep(codes, 2, codemins) | |
switch(codeRendering, segments = { | |
stars(codes, locations = x$grid$pts, labels = NULL, | |
len = 0.4, add = TRUE, col.segments = palette.name(nvars), | |
draw.segments = TRUE) | |
}) | |
} |
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