September 2003
Intermediate to advanced
396 pages
10h 15m
English
Content preview from Mastering Perl for BioinformaticsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 8. Perl and Graphics
The importance of an attractive and useful graphical display of information is fundamental to scientific programming. Just imagine the difference between seeing a graph of this week’s stock market activity, and seeing a list of several pages of numbers describing the same activity. The former can be surveyed in a glance; the latter requires considerable study. The same principle applies to the display of results in bioinformatics. Of course, sometimes you need the raw data; but very often what you need is the overview that a good graphic can provide.
Although there are many programming systems to produce graphics, the most popular are those that can be displayed via web browsers. This chapter builds on what you learned in Chapter 7 by showing you how to add graphics to your display of scientific results on a web page.
My vehicle of choice for displaying scientific data is the
GD.pm
module, which allows you to produce images in the standard graphics
formats PNG (Portable Network Graphics) and
JPEG (Joint Pictures Expert Group), among
others. I’ll also briefly mention the graphics
packages ImageMagick and Gimp, two more full-featured graphics
creation and manipulation packages.
GD.pm is an interface to the
gd
graphics library written in the C
programming language by Thomas Boutell. The gd graphics library is fairly basic; it’s fast, it handles text and various kinds of lines and space filling by means of its various functions, and it is easy to program ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.