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require 'enumerable/statistics'
module UnicodePlot
class Boxplot < Plot
MIN_WIDTH = 10
DEFAULT_COLOR = :green
def initialize(data, width, color, min_x, max_x, **kw)
if min_x == max_x
min_x -= 1
max_x += 1
end
width = [width, MIN_WIDTH].max
@data = [data.percentile([0, 25, 50, 75, 100])]
@color = color
@width = [width, MIN_WIDTH].max
@min_x = min_x
@max_x = max_x
super(**kw)
end
attr_reader :min_x
attr_reader :max_x
def n_data
@data.length
end
def n_rows
3 * @data.length
end
def n_columns
@width
end
def add_series!(data)
mi, ma = data.minmax
@data << data.percentile([0, 25, 50, 75, 100])
@min_x = [mi, @min_x].min
@max_x = [ma, @max_x].max
end
def print_row(out, row_index)
check_row_index(row_index)
series = @data[(row_index / 3.0).to_i]
series_row = row_index % 3
min_char = ['╷', '├' , '╵'][series_row]
line_char = [' ', '─' , ' '][series_row]
left_box_char = ['┌', '┤' , '└'][series_row]
line_box_char = ['─', ' ' , '─'][series_row]
median_char = ['┬', '│' , '┴'][series_row]
right_box_char = ['┐', '├' , '┘'][series_row]
max_char = ['╷', '┤' , '╵'][series_row]
line = (0 ... @width).map { ' ' }
# Draw shapes first - this is most important,
# so they'll always be drawn even if there's not enough space
transformed = transform(series)
line[transformed[0] - 1] = min_char
line[transformed[1] - 1] = left_box_char
line[transformed[2] - 1] = median_char
line[transformed[3] - 1] = right_box_char
line[transformed[4] - 1] = max_char
(transformed[0] ... (transformed[1] - 1)).each do |i|
line[i] = line_char
end
(transformed[1] ... (transformed[2] - 1)).each do |i|
line[i] = line_box_char
end
(transformed[2] ... (transformed[3] - 1)).each do |i|
line[i] = line_box_char
end
(transformed[3] ... (transformed[4] - 1)).each do |i|
line[i] = line_char
end
print_styled(out, line.join(''), color: @color)
end
private def transform(values)
values.map do |val|
val = (val - @min_x).fdiv(@max_x - @min_x) * @width
val.round(half: :even).clamp(1, @width).to_i
end
end
end
module_function def boxplot(*args,
data: nil,
border: :corners,
color: Boxplot::DEFAULT_COLOR,
width: Plot::DEFAULT_WIDTH,
xlim: [0, 0],
**kw)
case args.length
when 0
data = Hash(data)
text = data.keys
data = data.values
when 1
data = args[0]
when 2
text = Array(args[0])
data = args[1]
else
raise ArgumentError, "wrong number of arguments"
end
case data[0]
when Numeric
data = [data]
when Array
# do nothing
else
data = data.to_ary
end
text ||= Array.new(data.length, "")
unless text.length == data.length
raise ArgumentError, "wrong number of text"
end
unless xlim.length == 2
raise ArgumentError, "xlim must be a length 2 array"
end
min_x, max_x = Utils.extend_limits(data.map(&:minmax).flatten, xlim)
width = [width, Boxplot::MIN_WIDTH].max
plot = Boxplot.new(data[0], width, color, min_x, max_x,
border: border, **kw)
(1 ... data.length).each do |i|
plot.add_series!(data[i])
end
mean_x = (min_x + max_x) / 2.0
min_x_str = (Utils.roundable?(min_x) ? min_x.round : min_x).to_s
mean_x_str = (Utils.roundable?(mean_x) ? mean_x.round : mean_x).to_s
max_x_str = (Utils.roundable?(max_x) ? max_x.round : max_x).to_s
plot.annotate!(:bl, min_x_str, color: :light_black)
plot.annotate!(:b, mean_x_str, color: :light_black)
plot.annotate!(:br, max_x_str, color: :light_black)
text.each_with_index do |name, i|
plot.annotate_row!(:l, i*3+1, name) if name.length > 0
end
plot
end
module_function def boxplot!(plot, *args, **kw)
case args.length
when 1
data = args[0]
name = kw[:name] || ""
when 2
name = args[0]
data = args[1]
else
raise ArgumentError, "worng number of arguments"
end
if data.empty?
raise ArgumentError, "Can't append empty array to boxplot"
end
plot.add_series!(data)
plot.annotate_row!(:l, (plot.n_data - 1)*3+1, name) if name && name != ""
min_x = plot.min_x
max_x = plot.max_x
mean_x = (min_x + max_x) / 2.0
min_x_str = (Utils.roundable?(min_x) ? min_x.round : min_x).to_s
mean_x_str = (Utils.roundable?(mean_x) ? mean_x.round : mean_x).to_s
max_x_str = (Utils.roundable?(max_x) ? max_x.round : max_x).to_s
plot.annotate!(:bl, min_x_str, color: :light_black)
plot.annotate!(:b, mean_x_str, color: :light_black)
plot.annotate!(:br, max_x_str, color: :light_black)
plot
end
end
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