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#!/usr/bin/env ruby
require 'term/ansicolor'
include Term::ANSIColor
require 'tins/xt'
include Tins::GO
require "complex"
$width, $height = Tins::Terminal.cols, Tins::Terminal.lines
$height *= 2
def color_random
(1..3).map { rand(255) }
end
def draw_set(rx, ry)
sx = (rx.end - rx.begin).abs / $width
sy = (ry.end - ry.begin).abs / $height
steps = 16
color = (5.times.map { color_random } + [ 0, 0, 0 ]).map { Attribute[_1] }
color = color[1..-1].inject(color[0,1]) { |c, x|
c + c.last.gradient_to(x, steps:)
}
iters = color.size - 2
data = [ [] ]
for j in 0...$height
for i in 0...$width
n, z_n = 0, Complex(0, 0)
c = Complex(sx * i + rx.begin, sy * j + ry.begin)
while n <= iters
break if z_n.abs > 2
z_n = z_n ** 2 + c
n += 1
end
data.last << n
end
data << []
end
screen = ''
(0...$height).step(2) do |j|
(0...$width).each do |i|
screen << color(color[data[j][i]]) <<
on_color(color[data[j + 1][i]]) << ?▀
end
end
print move_home, screen, reset
end
opts = go 'x:y'
Term::ANSIColor.true_coloring = ENV['COLORTERM'] =~ /\A(truecolor|24bit)\z/
rx = opts[?x].full? { |r| Range.new(*(r.split('..', 2).map(&:to_f))) } || (-2.0..1.0)
ry = opts[?y].full? { |r| Range.new(*(r.split('..', 2).map(&:to_f))) } || (-1.0..1.0)
draw_set rx, ry
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