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| 1 | <?php |
| 2 | |
| 3 | // the current range of board position is -31 to +31 |
| 4 | // the negative values is to support different transformations related to board comparisons |
| 5 | class BoardPosition |
| 6 | { |
| 7 | public const ZERO = (32 << 6) + 32; |
| 8 | |
| 9 | public static function pack($x, $y): int |
| 10 | { |
| 11 | return ($x + 32) << 6 | ($y + 32); |
| 12 | } |
| 13 | |
| 14 | public static function fromLetters($x, $y): int |
| 15 | { |
| 16 | return BoardPosition::pack(ord($x) - ord('a'), ord($y) - ord('a')); |
| 17 | } |
| 18 | |
| 19 | public static function unpackX(int $packed): int |
| 20 | { |
| 21 | return ($packed >> 6) - 32; |
| 22 | } |
| 23 | public static function unpackY(int $packed): int |
| 24 | { |
| 25 | return ($packed & 63) - 32; |
| 26 | } |
| 27 | |
| 28 | public static function toLetters(int $packed): string |
| 29 | { |
| 30 | return chr(self::unpackX($packed) + ord('a')) . chr(self::unpackY($packed) + ord('a')); |
| 31 | } |
| 32 | |
| 33 | public static function flipX(int $packed, int $size): int |
| 34 | { |
| 35 | return self::pack($size - 1 - self::unpackX($packed), self::unpackY($packed)); |
| 36 | } |
| 37 | |
| 38 | public static function flipY(int $packed, int $size): int |
| 39 | { |
| 40 | return self::pack(self::unpackX($packed), $size - 1 - self::unpackY($packed)); |
| 41 | } |
| 42 | |
| 43 | public static function mirror(int $packed): int |
| 44 | { |
| 45 | return self::pack(self::unpackY($packed), self::unpackX($packed)); |
| 46 | } |
| 47 | |
| 48 | public static function mirrorAround(int $packed, $pivot): int |
| 49 | { |
| 50 | $pivotX = self::unpackX($pivot); |
| 51 | $pivotY = self::unpackY($pivot); |
| 52 | $x = BoardPosition::unpackX($packed) - $pivotX + $pivotY; |
| 53 | $y = BoardPosition::unpackY($packed) - $pivotY + $pivotX; |
| 54 | return BoardPosition::pack($y, $x); |
| 55 | } |
| 56 | |
| 57 | public static function horizontallyMirroredAround(int $packed, $pivot): int |
| 58 | { |
| 59 | $pivotX = self::unpackX($pivot); |
| 60 | $x = $pivotX + $pivotX - BoardPosition::unpackX($packed); |
| 61 | return BoardPosition::pack($x, BoardPosition::unpackY($packed)); |
| 62 | } |
| 63 | |
| 64 | public static function verticallyMirroredAround(int $packed, $pivot): int |
| 65 | { |
| 66 | $pivotY = self::unpackY($pivot); |
| 67 | $y = $pivotY + $pivotY - BoardPosition::unpackY($packed); |
| 68 | return BoardPosition::pack(BoardPosition::unpackX($packed), $y); |
| 69 | } |
| 70 | |
| 71 | public static function shift(int $packed, int $shift): int |
| 72 | { |
| 73 | return $packed - $shift + BoardPosition::ZERO; |
| 74 | } |
| 75 | |
| 76 | public static function diff(int $a, int $b): int |
| 77 | { |
| 78 | return $a - $b + BoardPosition::ZERO; |
| 79 | } |
| 80 | |
| 81 | public static function min(int $packed, int $other): int |
| 82 | { |
| 83 | return self::pack(min(self::unpackX($packed), self::unpackX($other)), min(self::unpackY($packed), self::unpackY($other))); |
| 84 | } |
| 85 | } |