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# gradation.rb $Revision: 1.1 $
#
# gradation.rb: ʸǡɽ
# ѥ:
# str: ʸ
# first_color: ǡϿ(16 6)
# last_color: ǡλ(16 6)
#
# Copyright (C) 2002 by zoe <http://www.kasumi.sakura.ne.jp/~zoe/tdiary/>
#
# Original: http://www.kasumi.sakura.ne.jp/~zoe/tdiary/?date=20011229#p07
# Modified: by TADA Tadashi <http://sho.tdiary.net/>
#
def gradation( str, first_color, last_color )
ary = str.split( // )
len = ary.length - 1
result = ""
r = first_color[0..1].hex.to_f
g = first_color[2..3].hex.to_f
b = first_color[4..5].hex.to_f
rd = ((last_color[0..1].hex - r)/len)
gd = ((last_color[2..3].hex - g)/len)
bd = ((last_color[4..5].hex - b)/len)
ary.each do |x|
c = sprintf( '%02x%02x%02x', r, g, b )
result << %Q[<span style="color: ##{c}">#{x}</span>]
r += rd
g += gd
b += bd
end
result
end
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