def update_atk(self, tower):
""" handles mechanics and graphics updates related to creep attacking a tower """
if self.__atk_cooldown_tick > 0: #atk cooldown period
self.__atk_cooldown_tick -= 1
else: #animation period
if self.__target == None: #either the creep didnt have any target before or its target was killed or moved
#self.__target = self.__GAMEBOARD.get_creep_best_target(self.__current_cell) #find optimum target; can return None if no tower in sight
self.__target = tower
if self.__target == None: #no tower in sight
self.__atk_anim_tick = config_get_creep_atk_anim_duration(
) #come back or stay in default position (ie anim=0 and cooldown=0)
else: #tower has a target to attack
self.__GAMEBOARD.draw_atk_animation(
self, self.__target, config_get_creep_atk_color(
)) #display atk graphics in both cases
if self.__atk_anim_tick == 0: #it is the moment to actually inflict dmg to a tower
self.__target.defend(self.__ATK)
self.__target = None
self.__atk_anim_tick = config_get_creep_atk_anim_duration(
) #no anim to draw anymore
self.__atk_cooldown_tick = config_get_creep_atk_cooldown(
) #put in cooldown mode
else: #creep is doing its atk animation only
self.__atk_anim_tick -= 1
return
def __init__(self, gb, sprpos, cell):
#static data for game mechanics
self.__GAMEBOARD = gb # pointer to the game board to ask for services such as "get me a tower to attack"
self.__MAXHP = config_get_creep_hp()
self.__ATK = config_get_creep_atk()
self.__ATK_RANGE = config_get_creep_atk_range(
) #range at which creep can attack tower
self.__MVT_RANGE = config_get_creep_mvt_range(
) #range at which creep can move (2 means it can potentially jump over a tower)
self.__MVT_COOLDOWN = config_get_creep_mvt_cooldown(
) #cooldown before creep can move again, in frames
#dynamic data (status)
self.__hp = self.__MAXHP
self.__atk_cooldown_tick = config_get_creep_atk_cooldown(
) #at the beginning creeps can not attack
self.__atk_anim_tick = config_get_creep_atk_anim_duration(
) #initialized at animduration and decreased each tick. when == 0, creep actually attacks
# creep actually inflicts dmg every (atkcooldown + atkanimation) frames
self.__mvt_cooldown_tick = self.__MVT_COOLDOWN #at beginning, creeps have to wait before moving
self.__current_cell = cell
self.__target = None
#__SPRITE
self.__SPRITE = pygame.sprite.Sprite()
self.__SPRITE.image, self.__SPRITE.rect = load_image(
config_get_creep_sprite(),
(int(self.__GAMEBOARD.get_cell_width() *
config_get_creep_sprite_scale()),
int(self.__GAMEBOARD.get_cell_height() *
config_get_creep_sprite_scale())))
self.__SPRITE.area = pygame.display.get_surface().get_rect()
self.__padding = (1 - config_get_creep_sprite_scale()) / 2
self.__SPRITE.rect.topleft = int(
sprpos[0] + self.__GAMEBOARD.get_cell_width() * self.__padding
), int(sprpos[1] + self.__GAMEBOARD.get_cell_height() * self.__padding)
#if spritescale = 0.8, then padding should be (1-0.8)/2 = 0.1 on top and bottom, and 0.1 on left and right
#so that the spr is centered in the middle of the cell
return
