various changes and fixes

[ape.git] / R / scales.R

diff --git a/R/scales.R b/R/scales.R
index 9699b5b165ca81c4922ddfee2f86242c6d6e54d8..378f985cc4c434e3104c2a3498844aba991540a2 100644 (file)
--- a/R/scales.R
+++ b/R/scales.R
@@ -1,42 +1,81 @@
-## scales.R (2004-12-18)
+## scales.R (2009-07-23)
 
 ##   Add a Scale Bar or Axis to a Phylogeny Plot
 
 ## add.scale.bar: add a scale bar to a phylogeny plot
 ## axisPhylo: add a scale axis on the side of a phylogeny plot
 
-## Copyright 2002-2004 Emmanuel Paradis
+## Copyright 2002-2009 Emmanuel Paradis
 
 ## This file is part of the R-package `ape'.
 ## See the file ../COPYING for licensing issues.
 
-add.scale.bar <- function(x = 0, y = 1, length = NULL, ...)
+add.scale.bar <- function(x, y, length = NULL, ...)
 {
+    lastPP <- get("last_plot.phylo", envir = .PlotPhyloEnv)
+    direc <- lastPP$direction
     if (is.null(length)) {
-        nb.digit <- ceiling(log10(mean(.last_plot.phylo$xx))) - 2
+        nb.digit <-
+          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 = "")))
     }
-    segments(x, y, x + length, y)
-    text(x + length * 1.1, y, as.character(length), adj = c(0, 0.5), ...)
+
+    if (missing(x) || missing(y))
+        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)
+               })
+
+    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, ...)
 {
-    if (.last_plot.phylo$type %in% c("phylogram", "cladogram")) {
-        if (.last_plot.phylo$direction %in% c("rightwards", "leftwards")) {
-            x <- pretty(.last_plot.phylo$xx)
-            if (.last_plot.phylo$direction == "rightwards")
-              maxi <- max(.last_plot.phylo$xx)
+    lastPP <- get("last_plot.phylo", envir = .PlotPhyloEnv)
+    if (lastPP$type %in% c("phylogram", "cladogram")) {
+        if (lastPP$direction %in% c("rightwards", "leftwards")) {
+            x <- pretty(lastPP$xx)
+            if (lastPP$direction == "rightwards") maxi <- max(lastPP$xx)
             else {
-                maxi <- min(.last_plot.phylo$xx)
+                maxi <- min(lastPP$xx)
                 x <- -x
             }
         } else {
-            x <- pretty(.last_plot.phylo$yy)
-            if (.last_plot.phylo$direction == "upwards")
-            maxi <- max(.last_plot.phylo$yy)
+            x <- pretty(lastPP$yy)
+            if (lastPP$direction == "upwards") maxi <- max(lastPP$yy)
             else {
-                maxi <- min(.last_plot.phylo$yy)
+                maxi <- min(lastPP$yy)
                 x <- -x
             }
         }