Iteration of numbers when pressing the keys, how to implement?

Question

Informatics

let's say there is a conditionally field

broken into numbers.

123
456
789

movement to the right to the left bottom row is 789 , middle 456 , top 123.

top down from the middle is 852 , 147 , 369

how to implement such control ? as simple as possible?
we have a standard joystick The


question
is how to make the most simple enumeration of numbers on the joystick?
in this field
123
456
789

Answer 1

Well your field is a matrix (two dimensional array).
The current position is x, y.
Pressed the up button - subtracted 1 from y, with the check for the array boundaries. And further by analogy