sx=24, sy=20
dx=16, dy=16
sx=24, sy=20
dx=16, dy=16
8888888888888888888888888888888888
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88              *                8
88              *                8
88              *                8
88              *                8
88              *                8
88               *               8
88                *              8
88                 *             8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
88                               8
8888888888888888888888888888888888
3, 3, 3, 3, 4, 4, 4, 4,