【ruby】256色　出力

2014年4月3日

def rgb(red, green, blue)
16 + (red * 36) + (green * 6) + blue
end

def gray(g)
232 + g
end

def set_color(fg, bg)
print “\x1b[38;5;#{fg}m" if fg
print “\x1b[48;5;#{bg}m" if bg
end

def reset_color
print “\x1b[0m"
end

def print_color(txt, fg, bg)
set_color(fg, bg)
print txt
reset_color
end

# 便利なメソッド
def rgb_cube
for green in 0..5 do
0.upto 5 do |red|
0.upto 5 do |blue|
yield [red, green, blue]
end
print " "
end
puts
end
end

# rgb一覧の黒背景
rgb_cube do |red, green, blue|
print_color(“%d%d%d " % [red, green, blue], rgb(red, green, blue), nil)
end
puts

#rgb一覧の白背景
rgb_cube do |red, green, blue|
print_color(“%d%d%d " % [red, green, blue], rgb(red, green, blue), 15)
end
puts

# system palette:
print “System colors:\n";
(0..7).each do |color|
print_color(" “, nil, color)
end
p

(8..15).each do |color|
print_color(" “, nil, color)
end
p
p

# color cube
print “Color cube, 6x6x6:\n"
rgb_cube do |red, green, blue|
print_color(" “, nil, rgb(red, green, blue))
end
puts

# grayscale ramp
print “Grayscale ramp:\n"
(0..23) .each do |g|
print_color(" “, nil, gray(g))
end

p
p