I need to generate and embed a time series chart into an ASP.NET application.
Most run-time charting tools generate poor time axes, especially if the time scale is dynamic ie the user may choose to view data over a time scale of days, weeks, months or years.
I'm looking for recommended tools that can be integrated into my app. Two that show promise are Chart Director and Google's annotated timeline visualization. Both are quite different in their implementation and have pros/cons.
I've always found ChartDirector to be very good, it can do pretty much anything that you want. Sometimes it might not be immediately obvious how to do something complex but the support forums on their site are monitored by a great guy called Peter Kwan. He has always been able to point me in the right direction with some sample code.
Take a look at amCharts Stock Chart (provided you aren't against using Flash). Even though it's called stock chart it's actually very good at displaying any date/time based data. It let's users zoom in and out and can aggregate data for you into a longer periods when they zoom out.