I have created a 2D Tile Based game. The game has a single path that the sprite can move on. I want to create to make the entire screen black except for where the sprite is.
The sprite has commands such as left where he keeps looking left, right where he keeps looking right and move forward where he moves in the direction he is looking. I want to make it such that when he looks left then the tile on the left of the sprites, fog should be removed and so on for all the sides.
How can I do this?
As always, you have several ways of doing it:
In any case, add a bool Visible to each tile, and set it to true when it has been discovered. This property decides whether your tile is visible or not. How you save that property entirely depends on your code, only you can answer that.
a) Set the background to black (GraphicsDevice.Clear(Color.Black);) at the beginning of each draw step, and simply don't draw an undiscovered tile.
b) All overloads of SpriteBatch.Draw have a parameter Color, which tints the texture to a certain color, without changing the actual texture in any way. If Visible == false, then you use Color.Black in the Draw method, otherwise you use Color.White.
c) If at some point you want a nicer texture than plain black, you can simply start out with all tiles being the fog tile, and then replace the texture at a visible tile with the one it is supposed to be.
To do what you want you need to use combine the char line of sight with the visibility of the tile.
You will use some algorithm to determine which tiles are visible or not at a given time.
There are several algorithms for that, research one suitable for your game type.
Each tile will have three states:
