I need a lightweight javascript library to create a stacked line graph (a bit like what is used in financial graphs). The X axis will be dates and the Y axis will be ordinary float values.
There will be two sections of the graph:
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Top graph which is a line graph. I want to be able to specify the color of a line segment (i.e. joining two dated points)
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The bottom part is just a rectangle/bar which represents the value. Once again, I want to be able to specify the color of the bar for a particular date.
It would be cool if the library used JQuery (since I have used jQuery in the past) – but even plain old JS code library would be equally useful.
I recommend Google Chart API / Chart Tools (examples) and Google Visualization API (examples).
The former being less powerful than the latter, but also more low-tech, so possibly easier to use (and more portable across platforms. The basic Chart API generates static images for you).
But you can also use:
Or even use a more high-level library like ExtJS (examples).