How do we find the four point from the center of a raster data?

For example,

    x1    x2

       y

    x3    x4

How would x2, x2, x3 and x4 be found and y is not necessarily not in the
center.  Also know the change in horizontal  distance is 10 meter spacing
and vertical distance is 10 meter from x1 to x3.

Thanks
        VG

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