newRect = OffsetRect(oldRect,x,y)

Offset the passed rect matrix by the horizontal (x)
and vertical (y) shift given. You can also pass in column vectors x and y
with e.g., n different “shifts” and the function will return n copies of
oldRect, each shifted by one of the shift values in x and y.

Alternatively you can give a single scalar x,y shift value, but apply it
to a whole matrix of rects ‘oldRect’ –> Apply a common offset to a large
number of rects simultaneously.

Also see PsychRects.

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