Sparklines for Java 1.2

Sparklines are intense, simple, wordlike graphics.
Theres a PHP library for producing sparklines, and even a sparkline web service, but I wanted something I could use to generate sparklines in both Java and JSTL (and I thought it would be a fun project). (Its also worth checking out Whys minimalist python sparklines, which encode the image data directly in the HTML as a data: URI [this library allows you to encode the images as using either data: format or javascript: format (supported by IE) in JSTL])
JSTL examples
< %@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" % >
< %@ taglib prefix="spark" uri="http://www.representqueens.com/taglibs/spark" % >
< c:set var="test" value="5, 35, 22, 19, 16, 10, 4, 33, 9, 12, 27, 36, 22" / >
< img src="< spark:bar name="test" color="red" / >" / >
will produce:
(I think the default size might be a little large).
The "name" attribute specifies the key to find the data (Uses JspContext.findAttribute). It expects the value to be either a List , a Number[], or a String of comma separated int values. Its the only manditory attribute.
The other attributes are width, height, spacing, color, highColor, lastColor, output. You can replace "bar" with "line" to get a linegraph (note: highColor and lastColor are currently not supported for line graphs).
The color attributes can either be a color name (a field name from java.awt.Color), or a HTML hex color (e.g. #ff0000 for red).
Enhancements:
- This release properly URL encodes parameters for server generated sparklines.
- This fixes an issue when using hex specified image colors.
- The tag parameter "background" has been added as a workaround for IE6 PNG transparency.