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direction.go
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direction.go
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package chessongo
//Directions of movement
const (
DIRECTION_N = iota
DIRECTION_S
DIRECTION_E
DIRECTION_W
DIRECTION_NE
DIRECTION_NW
DIRECTION_SE
DIRECTION_SW
)
//Significant bit type
const (
LSB = iota
MSB
)
type Direction uint
var ALL_DIRECTIONS = [8]Direction{
DIRECTION_N,
DIRECTION_S,
DIRECTION_E,
DIRECTION_W,
DIRECTION_NE,
DIRECTION_NW,
DIRECTION_SE,
DIRECTION_SW,
}
var ROOK_DIRECTIONS = [4]Direction{
DIRECTION_N,
DIRECTION_S,
DIRECTION_E,
DIRECTION_W,
}
var BISHOP_DIRECTIONS = [4]Direction{
DIRECTION_NE,
DIRECTION_NW,
DIRECTION_SE,
DIRECTION_SW,
}
//(X,Y)-based Shift of every direction
var DIRECTION_SHIFT = [8][2]int{}
//Tells which bit is the blocking bit in every direction
var DIRECTION_LSB_MSP = [8]uint{}
var KING_RANK_FILE_SHIFTS = [8][2]int{
{-1, -1}, {0, -1}, {1, -1}, {-1, 0},
{1, 0}, {-1, 1}, {0, 1}, {1, 1},
}
var KNIGHT_RANK_FILE_SHIFTS = [8][2]int{
{-2, -1}, {-2, 1}, {2, -1}, {2, 1},
{-1, -2}, {-1, 2}, {1, -2}, {1, 2},
}
func init() {
DIRECTION_LSB_MSP[DIRECTION_E] = MSB
DIRECTION_LSB_MSP[DIRECTION_W] = LSB
DIRECTION_LSB_MSP[DIRECTION_N] = LSB
DIRECTION_LSB_MSP[DIRECTION_S] = MSB
DIRECTION_LSB_MSP[DIRECTION_NE] = LSB
DIRECTION_LSB_MSP[DIRECTION_NW] = LSB
DIRECTION_LSB_MSP[DIRECTION_SE] = MSB
DIRECTION_LSB_MSP[DIRECTION_SW] = MSB
DIRECTION_SHIFT[DIRECTION_N] = [2]int{1 /*Rank*/, 0 /*File*/}
DIRECTION_SHIFT[DIRECTION_S] = [2]int{-1, 0}
DIRECTION_SHIFT[DIRECTION_E] = [2]int{0, -1}
DIRECTION_SHIFT[DIRECTION_W] = [2]int{0, 1}
DIRECTION_SHIFT[DIRECTION_NE] = [2]int{1, -1}
DIRECTION_SHIFT[DIRECTION_NW] = [2]int{1, 1}
DIRECTION_SHIFT[DIRECTION_SE] = [2]int{-1, -1}
DIRECTION_SHIFT[DIRECTION_SW] = [2]int{-1, 1}
}