Draw a antialiased line in a fast way

Question

I have a little problem. I've recently created an algorithm to allow thick lines to be drawed onscreen (as a quad structure), the problem is that when the line is very long and diagonal the aliasing is very high, making the line look very bad. What are my chance to reduce the aliasing while trying to have high performance?

I'm using (as the tags says) DirectX as graphics API.

Answer 1

There is a very good article in GPU Gems 2 about antialiasing technique for lines, see it here:

http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter22.html