Bluff is a JavaScript port of the Gruff graphing library for Ruby. It is designed to support all the features of Gruff with minimal dependencies; the only third-party scripts you need to run it are a copy of JS.Class (2.6kB gzipped) and a copy of Google’s ExCanvas to support canvas in Internet Explorer. Both these scripts are supplied with the Bluff download. Bluff itself is around 11kB gzipped.

To draw a graph, you create a new Bluff graph object using the id of a canvas element on the page, set some options, add the data and labels, then tell the graph to draw. A basic example:

  <canvas id="example" width="400" height="300"></canvas>

  <script type="text/javascript">
    var g = new Bluff.Line('example', '400x300');
    g.title = 'My Graph';
    g.tooltips = true;

    g.theme_37signals();"Apples", [1, 2, 3, 4, 4, 3]);"Oranges", [4, 8, 7, 9, 8, 9]);"Watermelon", [2, 3, 1, 5, 6, 8]);"Peaches", [9, 9, 10, 8, 7, 9]);

    g.labels = {0: '2003', 2: '2004', 4: '2005'};