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Tile Adjacency.
Adjacency refers to the property of other tiles neighbouring or touching a tile in question. In maps where tiles are a square grid, there are two kinds of adjacency. There is "normal" adjacency which is just called ADJACENT, and then there is cardinal adjacency, referred to as CARDINALLY ADJACENT.
Adjacency
Adjacent tiles are any of the 8 tiles that touch the tile in question. In the image below:
- The blue tile is the tile in question.
- The green tiles are adjacent.
- White tiles are non-adjacent.
Cardinal Adjacency
Cardinally Adjacent tiles are any of the 4 tiles that directly touch the tile in question, and do not include the corners. Cardinal adjacency gets its name from the "cardinal directions" of North, South, East, and West, the main four points of a compass. In the image below:
- The blue tile is the tile in question.
- The green tiles are cardinally adjacent.
- White tiles are non-cardinally-adjacent.