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melcor76/board.js Secret

Created November 19, 2019 12:54
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js-tetris - rotate
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board.js
// Transpose matrix, p is the Piece.
for (let y = 0; y < p.shape.length; ++y) {
for (let x = 0; x < y; ++x) {
[p.shape[x][y], p.shape[y][x]] =
[p.shape[y][x], p.shape[x][y]];
}
}
// Reverse the order of the columns.
p.shape.forEach(row => row.reverse());
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