cairo:region-rectangle (region nth)

region -- a cairo:region-t instance
nth -- an integer indicating which rectangle should be returned
x -- an integer for the x coordinate of the left side of the rectangle
y -- an integer for the y coordinate of the top side of the rectangle
width -- an integer for the width of the rectangle
height -- an integer for the height of the rectangle

The (x y width height) list with the coordinates of the nth rectangle.

Returns the nth rectangle from the region as a list with the coordinates of the rectangle.