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module UnicodePlot
class Barplot < Plot
include ValueTransformer
MIN_WIDTH = 10
DEFAULT_COLOR = :green
DEFAULT_SYMBOL = "■"
def initialize(bars, width, color, symbol, transform, **kw)
if symbol.length > 1
raise ArgumentError, "symbol must be a single character"
end
@bars = bars
@symbol = symbol
@max_freq, i = find_max(transform_values(transform, bars))
@max_len = bars[i].to_s.length
@width = [width, max_len + 7, MIN_WIDTH].max
@color = color
@symbol = symbol
@transform = transform
super(**kw)
end
attr_reader :max_freq
attr_reader :max_len
attr_reader :width
def n_rows
@bars.length
end
def n_columns
@width
end
def add_row!(bars)
@bars.concat(bars)
@max_freq, i = find_max(transform_values(@transform, bars))
@max_len = @bars[i].to_s.length
end
def print_row(out, row_index)
check_row_index(row_index)
bar = @bars[row_index]
max_bar_width = [width - 2 - max_len, 1].max
val = transform_values(@transform, bar)
bar_len = max_freq > 0 ?
([val, 0].max.fdiv(max_freq) * max_bar_width).round :
0
bar_str = max_freq > 0 ? @symbol * bar_len : ""
bar_lbl = bar.to_s
print_styled(out, bar_str, color: @color)
print_styled(out, " ", bar_lbl, color: :normal)
pan_len = [max_bar_width + 1 + max_len - bar_len - bar_lbl.length, 0].max
pad = " " * pan_len.round
out.print(pad)
end
private def find_max(values)
i = j = 0
max = values[i]
while j < values.length
if values[j] > max
i, max = j, values[j]
end
j += 1
end
[max, i]
end
end
# @overload barplot(text, heights, xscale: nil, title: nil, xlabel: nil, ylabel: nil, labels: true, border: :barplot, margin: Plot::DEFAULT_MARGIN, padding: Plot::DEFAULT_PADDING, color: Barplot::DEFAULT_COLOR, width: Plot::DEFAULT_WIDTH, symbol: Barplot::DEFAULT_SYMBOL)
#
# Draws a horizontal barplot.
#
# @param text [Array<String>] The lables / captions of the bars.
# @param heights [Array<Numeric>] The values / heights of the bars.
# @param xscale [nil,:log,:ln,:log10,:lg,:log2,:lb,callable]
# A function name symbol or callable object to transform the bar
# length before plotting. This effectively scales the x-axis
# without influencing the captions of the individual bars.
# e.g. use `xscale: :log10` for logscale.
# @param title
# @param xlabel
# @param ylabel
# @param labels
# @param border
# @param margin
# @param padding
# @param color
# @param width
# @param symbol [String] Specifies the character that should be used
# to render the bars.
#
# @return [Barplot] A plot object.
#
# @example Example usage of barplot on IRB:
#
# >> UnicodePlot.barplot(["Paris", "New York", "Moskau", "Madrid"],
# [2.244, 8.406, 11.92, 3.165],
# xlabel: "population [in mil]").render
# ┌ ┐
# Paris ┤■■■■■■ 2.244
# New York ┤■■■■■■■■■■■■■■■■■■■■■■■ 8.406
# Moskau ┤■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ 11.92
# Madrid ┤■■■■■■■■■ 3.165
# └ ┘
# population [in mil]
# => nil
#
# @see Plot
# @see histogram
# @see Barplot
#
# @overload barplot(data, **kwargs)
#
# The different variation of barplot described above.
#
# @param data [Hash] A hash in which the keys will be used as `text` and
# the values will be utilized as `heights`.
# @param kwargs Optional keyword arguments same as ones described above.
# @return [Barplot] A plot object.
module_function def barplot(*args,
width: Plot::DEFAULT_WIDTH,
color: Barplot::DEFAULT_COLOR,
symbol: Barplot::DEFAULT_SYMBOL,
border: :barplot,
xscale: nil,
xlabel: nil,
data: nil,
**kw)
case args.length
when 0
data = Hash(data)
keys = data.keys.map(&:to_s)
heights = data.values
when 2
keys = Array(args[0])
heights = Array(args[1])
else
raise ArgumentError, "invalid arguments"
end
unless keys.length == heights.length
raise ArgumentError, "The given vectors must be of the same length"
end
unless heights.min >= 0
raise ArgumentError, "All values have to be positive. Negative bars are not supported."
end
xlabel ||= ValueTransformer.transform_name(xscale)
plot = Barplot.new(heights, width, color, symbol, xscale,
border: border, xlabel: xlabel,
**kw)
keys.each_with_index do |key, i|
plot.annotate_row!(:l, i, key)
end
plot
end
# @overload barplot!(plot, text, heights)
#
# Draw additional bars on the given existing plot.
#
# @param plot [Barplot] the existing plot.
# @return [Barplot] A plot object.
#
# @see barplot
#
# @overload barplot!(plot, data)
#
# The different variation of `barplot!` that takes the plotting data in a hash.
#
# @param plot [Barplot] the existing plot.
# @return [Barplot] A plot object.
module_function def barplot!(plot,
*args,
data: nil)
case args.length
when 0
data = Hash(data)
keys = data.keys.map(&:to_s)
heights = data.values
when 2
keys = Array(args[0])
heights = Array(args[1])
else
raise ArgumentError, "invalid arguments"
end
unless keys.length == heights.length
raise ArgumentError, "The given vectors must be of the same length"
end
if keys.empty?
raise ArgumentError, "Can't append empty array to barplot"
end
cur_idx = plot.n_rows
plot.add_row!(heights)
keys.each_with_index do |key, i|
plot.annotate_row!(:l, cur_idx + i, key)
end
plot
end
end
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