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【Rails】打印终端256 色

作者:sevk / 发布于2013/11/28/ 1064

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

# convenience method
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 list on black bg
rgb_cube do |red, green, blue|
 print_color("%d%d%d " % [red, green, blue], rgb(red, green, blue), nil)
end
puts

# rgb list on white bg
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

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