The avatar for @forresto
Forrest O.
open web tools for creativity and community
Published
Edited
Aug 31, 2019
Importers
15 stars
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TILES = [
['EMPTY', SPACE],
// key, char, turns to if expand up, right, down, left, rotated 180°
['O', '◽︎', 'T', 'R', 'B', 'L', 'O'],
['T', '╨', null, 'TR', 'TB', 'TL', 'B'],
['R', '╞', 'TR', null, 'RB', 'RL', 'L'],
['B', '╥', 'TB', 'RB', null, 'BL', 'T'],
['L', '╡', 'TL', 'RL', 'BL', null, 'R'],
['RB', '╔', 'TRB', null, null, 'RBL', 'TL'],
['BL', '╗', 'TBL', 'RBL', null, null, 'TR'],
['TR', '╚', null, null, 'TRB', 'TRL', 'BL'],
['TL', '╝', null, 'TRL', 'TBL', null, 'RB'],
['TB', '║', null, 'TRB', null, 'TBL', 'TB'],
['RL', '═', 'TRL', null, 'RBL', null, 'RL'],
['TRB', '╠', null, null, null, 'TRBL', 'TBL'],
['TBL', '╣', null, 'TRBL', null, null, 'TRB'],
['TRL', '╩', null, null, 'TRBL', null, 'RBL'],
['RBL', '╦', 'TRBL', null, null, null, 'TRL'],
['TRBL', '╬', null, null, null, null, 'TRBL'],
['NEG', SPACE],
]
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function findMutations (board, w = boardSize, h = w) {
const potentials = []
for (let index = 0, len = board.length; index < len; index++) {
const tile = board[index];

if (tile !== TILE_INDEX.EMPTY) {
continue;
}
const row = Math.floor(index / w)
const col = index % w
// Can this tile connect with the one under it?
if (row < h - 1) {
const underIndex = index + w
const under = TILES[board[underIndex]]
if (under[OVER]) {
// A mutation is represented as [this index, this tile, that index, that change tile]
potentials.push([index, UNDER, underIndex, TILE_INDEX[under[OVER]]])
}
}
// Over
if (row > 0) {
const overIndex = index - w
const over = TILES[board[overIndex]]
if (over[UNDER]) {
potentials.push([index, OVER, overIndex, TILE_INDEX[over[UNDER]]])
}
}
// Right
if (col < w - 1) {
const rightIndex = index + 1
const rightward = TILES[board[rightIndex]]
if (rightward[LEFT]){
potentials.push([index, RIGHT, rightIndex, TILE_INDEX[rightward[LEFT]]])
}
}
// Left
if (col > 0) {
const leftIndex = index - 1
const leftward = TILES[board[leftIndex]]
if (leftward[RIGHT]){
potentials.push([index, LEFT, leftIndex, TILE_INDEX[leftward[RIGHT]]])
}
}
};
return potentials;
}
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