how can i make this code work with trace?

c_scan(player.x,player.pan,vector(360,180,250),scan_ents | scan_limit ignore_me);

mainly the vector(360,180,250) so i can trace that area...

afaik there is no easy way to do this, because trace and scan are pretty different.
scan: scans an area around an entity, the dimension of this area is given by that vector

trace: kind of shooting a beam into a single direction to receive the direction to a obstacle or find out about the existence of an entity on the way from the trace start to the trace end.

As you can see this cannot be easily convert.
In scan you pass a vector which is a dimension (describes a spherical space around the location of the scan) and in the trace instruction you pass two vectors which are each a specific location in the 3d world space.

Here are two possible options you could try. One ist to set the flag USE_BOX which gives you a "thick" beam where the thickness is determined by the "me" entity, which is the otiginating entity by default. It will still only be a beam in a single direction though.

The second possibility is if you need to trace in a conal direction as you suggest, you need to script a trace sequence where your traces are sent with one or more degrees angle differences. This will take alot of computing power and may be too slow for your intended use, but it will accomplish sometnig that is is similar to a scan cone.

cheers