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# gradient.rb $Revision: 1.1 $
#
# gradient.rb: ʸ礭Ѳʤɽ
# ѥ:
# str: ʸ
# first_size: ʸ(͡ñpt)
# last_size: ʸ(͡ñpt)
#
# : ֤ʤȤǤޤפ10pt30pt˳
# <%=gradient 'ʤȤǤޤ', 10, 30 %>
#
# Copyright (C) 2002 by zoe <http://www.kasumi.sakura.ne.jp/~zoe/tdiary/>
#
# Original: http://www.kasumi.sakura.ne.jp/~zoe/tdiary/?date=20020122#p02
# Modified: by TADA Tadashi <http://sho.tdiary.net/>
#
def gradient( str, first_size, last_size )
ary = str.split( // )
len = ary.length - 1
result = ""
fontsize = first_size.to_f
sd = ( last_size - first_size ).to_f / len
ary.each do |x|
s = sprintf( '%d',fontsize.round )
result << %Q[<span style="font-size: #{s}pt;">#{x}</span>]
fontsize += sd
end
result
end
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