Quick and dirty FOV/LOS

Quick and dirty field of view/line of sight algorithm

This is a FOV algorithm i used in a C# roguelike i made for the learning experience, it is probably not as efficient as it could be.

Pseudo-code

void DoSomeFov() {

  For each block (assuming your roguelike map works in blocks, 99.9% of RL's do)
  {
     if the block is within the players view radius
     {
        draw a virtual line from the player to the block
        for each block on the line
        {
           set it as visible initially
           if it is a wall/door/object that blocks vision
           {
              the block = non-visible
           }
        }
     }
  }

}

Other methods

This method worked fine in my RL, however, it may be more efficient (read: probably) to draw a line to each block that lays on the line of circumference around the player (the radius being view distance), and going through each block on the line and checking for blocking objects.