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#
# ggdendro/R/dendro_tree.R by Andrie de Vries Copyright (C) 2011-2015
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 or 3 of the License
# (at your option).
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.r-project.org/Licenses/
#
#
# ------------------------------------------------------------------------
#' Create Dendrograms and Tree Diagrams using 'ggplot2'
#'
#' This package enables you to create dendrograms and tree plots using
#' [ggplot2::ggplot()].
#'
#' The `ggplot2` philosophy is to clearly separate data from the presentation.
#' Unfortunately the plot method for dendrograms ([plot.dendrogram()]) plots
#' directly to a plot device without exposing the data. The ggdendro package
#' resolves this by making available functions that extract the dendrogram plot
#' data. This data can be used with `ggplot`.
#'
#' The function [dendro_data()] extracts data from different objects that
#' contain dendrogram information. It is a generic function with methods for:
#'
#' \itemize{
#' \item hclust: [dendro_data.hclust()]
#' \item dendrogram: [dendro_data.dendrogram()]
#' \item regression trees: [dendro_data.tree()]
#' \item partition trees: [dendro_data.rpart()]
#' \item agnes and diana: [dendro_data.twins()]
#' }
#'
#' These methods create an object of class `dendro`, consisting of a list of
#' data frames. To extract the relevant data frames from the list, you can use
#' the accessor functions:
#'
#' \itemize{
#' \item{[segment()]}: {the line segment data}
#' \item{[label()]}: {the text for each end segment}
#' \item{[leaf_label()]}: {the leaf labels of a tree diagram}
#' }
#'
#' To plot a dendrogram, either construct a plot with [ggplot2::ggplot()] or use
#' the function [ggdendrogram()].
#'
#' @name ggdendro-package
#' @aliases ggdendro
#' @docType package
#' @import MASS ggplot2
#' @importFrom grDevices col2rgb dev.cur dev.new
#' @importFrom graphics par points polygon text
#' @importFrom stats as.dendrogram complete.cases is.leaf
#' @importFrom utils head stack tail
#' @author Andrie de Vries - \email{apdevries@@gmail.com}
#' @keywords package
#' @seealso [dendro_data()]
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