@rect_x = {3,2,4,0,3,0,4,0,3,2,0,4}
@rect_y = {0,0,0,1,1,0,3,3,3,3,2,2}
How can I sort this to get 
Rectangle 1 -> (4,0)
Rectangle 2 -> (4,2)
Rectangle 3 -> (4,3)
Rectangle 4 -> (3,0)
Rectangle 5 -> (3,1)
Rectangle 6 -> (3,3)
Rectangle 7 -> (2,0)
Rectangle 8 -> (2,3)
.
.
.
.
Rectangle n-1 -> (0,2)
Rectangle n -> (0,3)