http://snippets.dzone.com/posts Tue, 07 Oct 2008 03:53:09 GMT DZone Snippets: tagging code http://snippets.dzone.com/posts/show/2251 The options.delete with the default looks mildly interesting. Just wanted to remember that. <br /> <br /><code> <br />def font_size_for_tag_cloud( total, lowest, highest, options={} ) <br /> return nil if total.nil? or highest.nil? or lowest.nil? <br /> # <br /> # options <br /> maxf = options.delete( :max_font_size ) || 14 <br /> minf = options.delete( :min_font_size ) || 11 <br /> maxc = options.delete( :max_color ) || [ 0, 0, 0 ] <br /> minc = options.delete( :min_color ) || [ 156, 156, 156 ] <br /> hide_sizes = options.delete( :hide_sizes ) <br /> hide_colours = options.delete( :hide_colours ) <br /> # <br /> # function to work out rgb values <br /> def rgb_color( a, b, i, x) <br /> return nil if i <= 1 or x <= 1 <br /> if a > b <br /> a-(Math.log(i)*(a-b)/Math.log(x)).floor <br /> else <br /> (Math.log(i)*(b-a)/Math.log(x)+a).floor <br /> end <br /> end <br /> # <br /> # work out colours <br /> c = [] <br /> (0..2).each { |i| c << rgb_color( minc[i], maxc[i], total, highest ) || nil } <br /> colors = c.compact.empty? ? minc.join(',') : c.join(',') <br /> # <br /> # work out the font size <br /> spread = highest.to_f - lowest.to_f <br /> spread = 1.to_f if spread <= 0 <br /> fontspread = maxf.to_f - minf.to_f <br /> fontstep = spread / fontspread <br /> size = ( minf + ( total.to_f / fontstep ) ).to_i <br /> size = maxf if size > maxf <br /> # <br /> # display the results <br /> size_txt = "font-size:#{ size.to_s }px;" unless hide_sizes <br /> color_txt = "color:rgb(#{ colors });" unless hide_colours <br /> return [ size_txt, color_txt ].join <br />end <br /></code> Thu, 06 Jul 2006 17:01:58 GMT http://snippets.dzone.com/posts/show/2251 jnunemaker ()