The basic idea is, in one mode you place cameras in a level so you can view the area remotely later. I'm trying to require that the whole area be covered by the cameras before moving on. Unfortunately, I can't figure out a good way to do this.

It may be that this is more of a math problem than a Construct 2 problem, in which case, I'm sorry.

From my screenshot, you can see two cameras, of seven in the level, and the minimap showing the location of all seven cameras and their 'square of influence.' These cameras are placed by the player. As the squares can overlap, how do I figure out how much of the level is covered- since it's not just the amount of area each camera *can* cover times the number of cameras in use.