rec1
is to the left of rec2
by comparing if rec1[2]
(right side of rec1
) is less than or equal to rec2[0]
(left side of rec2
).rec1
is to the right of rec2
by comparing if rec1[0]
(left side of rec1
) is greater than or equal to rec2[2]
(right side of rec2
).rec1
is above rec2
by comparing if rec1[1]
(bottom side of rec1
) is greater than or equal to rec2[3]
(top side of rec2
).rec1
is below rec2
by comparing if rec1[3]
(top side of rec1
) is less than or equal to rec2[1]
(bottom side of rec2
).rec1
is to the left, right, above, or below rec2
, then the rectangles overlap.