The scenario definition
Once we have loaded the tile map, we need to link the resulting image with the game information. Our scenario class should contain the following:
The positions where the turrets can be placed
The position of the bunker
The initial position for enemy spawning
The path that the enemies must follow to reach the bunker
In the following screenshot, we can see this data overlaid on top of our TMX map:
The rectangles represent the slots in which the player can place the turrets. The scenario stores only the centers of these squares, because the game layer will translate these positions into clickable squares.
The lines over the road represent the path that the enemy tanks must follow. This movement will be implemented by chaining the MoveBy and RotateBy actions. We will define two constants for rotation toward the left or the right, and an auxiliary function that returns a MoveBy action whose duration makes the enemies move uniformly:
import cocos.actions as ac RIGHT = ac.RotateBy...
