A reader named Felix posted a comment on the blog, asking how he could make a line chart which has two time series, in which each time series has data for
The Google Chart API lets you dynamically generate charts. To see the Chart API in action, open up a browser window and copy the following URL into it:
http://chart.apis.google.com/chart?cht=p3&chd=t:60,40&chs=250x100&chl=Hello|World
Press the Enter or Return key and - presto! - you should see the following image:
Welcome To JFreeChart!
JFreeChart is a free 100% Java chart library that makes it easy for developers to display professional quality charts in their applications. JFreeChart's extensive feature set includes:
* a consistent and well-documented API, supporting a wide range of chart types;
* a flexible design that is easy to extend, and targets both server-side and client-side applications;
* support for many output types, including Swing components, image files (including PNG and JPEG), and vector graphics file formats (including PDF, EPS and SVG);
* JFreeChart is "open source" or, more specifically, free software. It is distributed under the terms of the GNU Lesser General Public Licence (LGPL), which permits use in proprietary applications.