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About
-----

Flot is a Javascript plotting library for jQuery. Read more at
the
website:

  http://code.google.com/p/flot/

Take a look at the examples
linked from above, they should give a good
impression of what Flot can do
and the source code of the examples is
probably the fastest way to learn
how to use Flot.
  

Installation
------------

Just include the Javascript
file after you've included jQuery.

Generally, all browsers that support
the HTML5 canvas tag are
supported.

For support for Internet Explorer <
9, you can use Excanvas, a canvas
emulator; this is used in the examples
bundled with Flot. You just
include the excanvas script like this:

 
<!--[if lte IE 8]><script language="javascript"
type="text/javascript"
src="excanvas.min.js"></script><![endif]-->

If
it's not working on your development IE 6.0, check that it has
support for
VML which Excanvas is relying on. It appears that some
stripped down
versions used for test environments on virtual machines
lack the VML
support.

You can also try using Flashcanvas
(see
http://code.google.com/p/flashcanvas/), which uses Flash to do
the
emulation. Although Flash can be a bit slower to load than VML,
if
you've got a lot of points, the Flash version can be much
faster
overall. Flot contains some wrapper code for activating Excanvas
which
Flashcanvas is compatible with.

You need at least jQuery 1.2.6, but
try at least 1.3.2 for interactive
charts because of performance
improvements in event handling.


Basic usage
-----------

Create a
placeholder div to put the graph in:

   <div
id="placeholder"></div>

You need to set the width and
height of this div, otherwise the plot
library doesn't know how to scale
the graph. You can do it inline like
this:

   <div
id="placeholder"
style="width:600px;height:300px"></div>

You can also do
it with an external stylesheet. Make sure that the
placeholder isn't within
something with a display:none CSS property -
in that case, Flot has trouble
measuring label dimensions which
results in garbled looks and might have
trouble measuring the
placeholder dimensions which is fatal (it'll throw an
exception).

Then when the div is ready in the DOM, which is usually on
document
ready, run the plot function:

 
$.plot($("#placeholder"), data, options);

Here, data is an array
of data series and options is an object with
settings if you want to
customize the plot. Take a look at the
examples for some ideas of what to
put in or look at the reference
in the file "API.txt". Here's a
quick example that'll draw a line from
(0, 0) to (1, 1):

 
$.plot($("#placeholder"), [ [[0, 0], [1, 1]] ], { yaxis: { max: 1
} });

The plot function immediately draws the chart and then returns a
plot
object with a couple of methods.


What's with the
name?
---------------------

First: it's pronounced with a short o, like
"plot". Not like "flawed".

So "Flot" rhymes
with "plot".

And if you look up "flot" in a
Danish-to-English dictionary, some up
the words that come up are
"good-looking", "attractive",
"stylish",
"smart", "impressive",
"extravagant". One of the main goals with Flot
is pretty looks.