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31 lines
1.6 KiB
Plaintext
31 lines
1.6 KiB
Plaintext
//Directions (already defined on BYOND natively, purely here for reference)
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/// define purely for readability, cables especially need to use this as `NO_DIRECTION` represents a "node"
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#define NO_DIRECTION 0
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//#define NORTH 1
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//#define SOUTH 2
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//#define EAST 4
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//#define WEST 8
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//#define NORTHEAST 5
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//#define SOUTHEAST 6
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//#define NORTHWEST 9
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//#define SOUTHWEST 10
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/// Using the ^ operator or XOR, we can compared TRUE East and West bits against our direction,
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/// since XOR will only return TRUE if one bit is False and the other is True, if East is 0, that bit will return TRUE
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/// and if West is 1, then that bit will return 0
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/// hence EAST (0010) XOR EAST|WEST (0011) --> WEST (0001)
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///Flips a direction along the horizontal axis, will convert E -> W, W -> E, NE -> NW, SE -> SW, etc
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#define FLIP_DIR_HORIZONTALLY(dir) ((dir & (EAST|WEST)) ? dir ^ (EAST|WEST) : dir)
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///Flips a direction along the vertical axis, will convert N -> S, S -> N, NE -> SE, SW -> NW, etc
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#define FLIP_DIR_VERTICALLY(dir) ((dir & (NORTH|SOUTH)) ? dir ^ (NORTH|SOUTH) : dir)
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/// for directions, each cardinal direction only has 1 TRUE bit, so `1000` or `0100` for example, so when you subtract 1
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/// from a cardinal direction it results in that directions initial TRUE bit always switching to FALSE, so if you & check it
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/// against its initial self, it will return false, indicating that the direction is straight and not diagonal
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/// returns TRUE if direction is diagonal and false if not
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#define IS_DIR_DIAGONAL(dir) (dir & (dir - 1))
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/// returns TRUE if direction is cardinal and false if not
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#define IS_DIR_CARDINAL(dir) (!IS_DIR_DIAGONAL(dir))
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