Fix bug made apparent by recent refactor

[samaloney]

Was always a little unclear to me but now I think it makes sense. In the transform code we use/ generate x, y and u, v. By convention x, u are expected to move left/right across or in the column direction while y, v move down/up vertically or in the row direction. Numpy arrays are row major, the 1st index is row 2nd is column but there was some inconsistency with applying this in the code.

• x, u are in the col direction, y, v in the row direction python is row, col order

[codecov]

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