Coordinate flipping

This is a simple example of how to use the apply functionality in a function, by flipping the x and y coordinates of a geometry.

"""
    flip(obj)

Swap all of the x and y coordinates in obj, otherwise
keeping the original structure (but not necessarily the
original type).

# Keywords

$APPLY_KEYWORDS
"""
function flip(geom; kw...)
    if _is3d(geom)
        return apply(PointTrait(), geom; kw...) do p
            (GI.y(p), GI.x(p), GI.z(p))
        end
    else
        return apply(PointTrait(), geom; kw...) do p
            (GI.y(p), GI.x(p))
        end
    end
end

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