Rotate bitmap

Rotate bitmap

var asset = {
  bitmap: [
    `A A A B B B`,
    `A . . . . B`,
    `A . 1 1 . B`,
    `D . 2 2 . C`,
    `D . . . . C`,
    `D D D C C C`
  ].map(row => row.split(' ')),
  size: 6
}

var getColumn = (grid, n) =>
  grid.reduce((acc, curr, index) => acc.concat(curr[n]), [])

var joinGrid = grid => grid.map(row => row.join(' ')).join('\n')

var rotate90 = ({ bitmap, size }, times) => {
  var rotated = [...Array(size).keys()].map(i => getColumn(bitmap, i).reverse())
  return times ? rotate90({ bitmap: rotated, size }, times - 1) : rotated
}

var rotate180 = grid => rotate90(grid, 1)
var rotate270 = grid => rotate90(grid, 2)


console.log(joinGrid(asset.bitmap))
/*
  A A A B B B
  A . . . . B
  A . 1 1 . B
  D . 2 2 . C
  D . . . . C
  D D D C C C
*/

console.log(joinGrid(rotate90(asset)))
/*
  D D D A A A
  D . . . . A
  D . 2 1 . A
  C . 2 1 . B
  C . . . . B
  C C C B B B
*/

console.log(joinGrid(rotate180(asset)))
/*
  C C C D D D
  C . . . . D
  C . 2 2 . D
  B . 1 1 . A
  B . . . . A
  B B B A A A
*/

console.log(joinGrid(rotate270(asset)))
/*
  B B B C C C
  B . . . . C
  B . 1 2 . C
  A . 1 2 . D
  A . . . . D
  A A A D D D
*/