Make checking solid between two objects

<img src="http://s1.ipicture.ru/uploads/20120908/0x5v5B27.png" border="0">

Is there any way to make this without using unnecessary sprite?

cheking_solid.capx

that? LoS.capx

Fixed capx.

So, I see it's impossible to do it without sprites?

I'd say it's the simplest way in C2.

You can always find an line of sight algorithm and try to implement it in C2.