New PDF release: Building Tag Clouds in Perl and PHP

By Bumgardner J.

ISBN-10: 0596527942

ISBN-13: 9780596527945

Tag clouds are far and wide on the net nowadays. First popularized through the net websites Flickr, Technorati, and, those amorphous clumps of phrases now seem on a slew of sites as visible proof in their club within the elite corps of "Web 2.0. This PDF analyzes what's and is not a tag cloud, deals layout information for utilizing them successfully, after which is going directly to convey how one can acquire tags and exhibit them within the tag cloud layout. Scripts are supplied in Perl and PHP.Yes, a few have acknowledged tag clouds are a fad. yet as one can find, tag clouds, while used adequately, have genuine benefits. extra importantly, the abilities you study in making your personal tag clouds show you how to make different attention-grabbing forms of interfaces that may live longer than the mercurial fads of this yr or the subsequent.

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As you can see, the words in Figure 19 are far too small. We probably don't wantto see a font size smaller than about te so let's add ten to the count. We'llchange the line that converts tag count to font size from this: $fsize = $cnt; 39 40 to this: $fsize = $cnt+10; This change produces the tag cloud shown in Figure 20. Figure 20. Minimum font size of ten points This looks OK, but there are a few problems. The word "music" is really big, butall the other words are quite small. I'd like to s a little more variety in the fontsizes.

Many of the intermediate font sizes won't get used at all because of the larger gaps between the counts of the most popular word The way to make this tag cloud look better is to use a logarithmic function to reverse the power curve's effects. Essentially, we will map the linear range of font values to the logarithmic range of tag counts, magnifying the differences between smaller coun and making the "long tail" of the power curve more visible (Figures 24 and 25). Figure 24. Linear mapping of x to y 42 43 Figure 25.

The data is retrieved fromthe copy of the book of Genesis at the Project Gutenberg web site. ) Let's see what it does.

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Building Tag Clouds in Perl and PHP by Bumgardner J.

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