Transforms

There are a number of functions to transform grids:

• transpose: transpose the grid (swapping x and y indices)
• rotate-left: rotate the grid 90 degrees anti-clockwise
• rotate-right: rotate the grid 90 degrees clockwise
• rotate-180: rotate the grid 180 degrees
• flip-lr: flip the grid left-to-right (reversing the x-axis)
• flip-tb: flip the grid top-to-bottom (reversing the y-axis)