Server Move Notification

Map coordinates: The coordinates of a lattice that divides pixel coordinates into 40*30

Pixel coordinates: This is the coordinates of the picture.

Block coordinates: It is the coordinates of the screen divided into 3*3, this also has to see.

When moving from point A to point B, the red is the left area, and the blue is the area in which the two areas are to be notified.

Here is the block coordinates, a client screen will be divided into 3*3 screen, listen to the manager said this division CPU consumption is minimal, I do not know why,

Since the location may be anywhere in a, these areas of departure and entry must be notified.