Woodworking Question On Making A Trellis

Hi woodworkers, got a novice woodworking question.

I am planning to build a trellis in the back yard to cover a patio about 22 feet in length and 16 feet in depth (width). Although the patio touches the house, I want to make the trellis free standing. The question I have is this... Can I support 24 foot boards without really needing any more than four posts towards the ends?

Will the trellis be strong enough to support a swing on one end? A swing that can support two grown ups? If you have any ideas, I would welcome them!

Update: OK got some feed back from some wood workers, and first, this would not be called a trellis, but a pergola. And their recommendation is that that there would be a need for additional support posts in the middle. But I have decided to attach it to the home just to make it easy and more elegant pergola.
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