-## scales.R (2009-07-23)
+## scales.R (2009-12-16)
## Add a Scale Bar or Axis to a Phylogeny Plot
## This file is part of the R-package `ape'.
## See the file ../COPYING for licensing issues.
-add.scale.bar <- function(x, y, length = NULL, ...)
+add.scale.bar <- function(x, y, length = NULL, ask = FALSE, ...)
{
lastPP <- get("last_plot.phylo", envir = .PlotPhyloEnv)
+ direc <- lastPP$direction
if (is.null(length)) {
nb.digit <-
- if (lastPP$direction %in% c("rightwards", "leftwards")) diff(range(lastPP$xx))
+ if (direc %in% c("rightwards", "leftwards")) diff(range(lastPP$xx))
else diff(range(lastPP$yy))
nb.digit <- ceiling(log10(nb.digit)) - 2
length <- eval(parse(text = paste("1e", nb.digit, sep = "")))
}
- if (missing(x) || missing(y)) {
- switch(lastPP$direction,
- "rightwards" = {
- x <- 0
- y <- 1
- segments(x, y, x + length, y)
- text(x + length * 1.1, y, as.character(length), adj = c(0, 0.5), ...)
- },
- "leftwards" = {
- x <- max(lastPP$xx)
- y <- 1
- segments(x - length, y, x, y)
- text(x - length * 1.1, y, as.character(length), adj = c(1, 0.5), ...)
- },
- "upwards" = {
- x <- max(lastPP$xx)
- y <- 0
- segments(x, y, x, y + length)
- text(x, y + length * 1.1, as.character(length), adj = c(0, 0.5), srt = 90, ...)
- },
- "downwards" = {
- x <- 1
- y <- max(lastPP$yy)
- segments(x, y - length, x, y)
- text(x, y - length * 1.1, as.character(length), adj = c(0, 0.5), srt = 270, ...)
- }
- )
+
+ if (ask) {
+ cat("\nClick where you want to draw the bar\n")
+ x <- unlist(locator(1))
+ y <- x[2]
+ x <- x[1]
+ } else if (missing(x) || missing(y)) {
+ if (lastPP$type %in% c("phylogram", "cladogram")) {
+ switch(direc,
+ "rightwards" = {
+ x <- 0
+ y <- 1
+ },
+ "leftwards" = {
+ x <- max(lastPP$xx)
+ y <- 1
+ },
+ "upwards" = {
+ x <- max(lastPP$xx)
+ y <- 0
+ },
+ "downwards" = {
+ x <- 1
+ y <- max(lastPP$yy)
+ })
+ } else {
+ direc <- "rightwards" # just to be sure for below
+ x <- lastPP$x.lim[1]
+ y <- lastPP$y.lim[1]
+ }
}
+
+ switch(direc,
+ "rightwards" = {
+ segments(x, y, x + length, y)
+ text(x + length * 1.1, y, as.character(length), adj = c(0, 0.5), ...)
+ },
+ "leftwards" = {
+ segments(x - length, y, x, y)
+ text(x - length * 1.1, y, as.character(length), adj = c(1, 0.5), ...)
+ },
+ "upwards" = {
+ segments(x, y, x, y + length)
+ text(x, y + length * 1.1, as.character(length), adj = c(0, 0.5), srt = 90, ...)
+ },
+ "downwards" = {
+ segments(x, y - length, x, y)
+ text(x, y - length * 1.1, as.character(length), adj = c(0, 0.5), srt = 270, ...)
+ })
}
axisPhylo <- function(side = 1, ...)