Adding fogs to the game play

How do you know how big the empire of the other player is? when you don't have a unit/spy near it to help you know the info on your neighbor. I'll says make a option where you your unit's view range can help you lift the fog.

> the land on the view range can be seen only by the player's unit.; the other area of land is fog. Until you move a unit to see the area with the unit's view range.
> I tried to draw and fill the the land around the unit's range.
> make this game more strategic, because you don't know who out there in the map, until your unit explore the land.
> Once your unit leave a area, the area will be fog again . Because your unit's view range is out of range.
> sentry planes will be more important. A support unit.
> how the hell you know a enemy's stack is coming toward you( you may not know the stack numbers), but you see an enemy stack coming toward you without the use of your unit's view range.
> reduce ally-fag, because if you don't know how big your enemy empire is, you would less likely ally them.
> reduce leaver, Give me a reason to leave if i don't know my enemy's territory empire, so i can't run away like a chicken/coward.
> competitive and fun- because Imagine scouting territories with your spies and realizing your enemy is preparing a invasion or vice versa, or you preparing an army of a huge stack, Without your enemy seeing a stack coming for them Unlike our normal system Where you can see a army( the enemy might not know the size/type of your army, because it out of view range, BUT they can see a army coming for them)- That the problem, how do you know a enemy stack coming for you without a unit's view range to detect it.
> Marine and any stealth unit is still stealth even with the view range, Unless the stealth unit is closed to another enemy's unit or it's unveiled when you attack a wall, but it obvious to an enemy if you take a enemy cities with unit out of nowhere, because it stealth.
> Make it as an option: no fog, or a fog.
I know some of you are a RP addict and need the no fog for diplomacy game, so i decided it should be implemented as an option.