def under(rect1, rect2):
left, top, right, bottom = intersect(rect1, rect2)
return rect2["top"] - rect1["bottom"] if left < right else -1
def onleftof(rect1, rect2):
left, top, right, bottom = intersect(rect1, rect2)
return rect1["left"] - rect2["right"] if top < bottom else -1
