python - My enemies stop moving if i move my player

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65931627/my-enemies-stop-moving-if-i-move-my-player

Answer 1

The result of ene_x // dist and ene_y // dist is always 0. To calculate the movement, you must use the / (division) operator rather than the // (floor division) operator

ene_x, ene_y = ene_x // dist, ene_y // dist

ene_x, ene_y = ene_x / dist, ene_y / dist

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Since pygame.Rect is supposed to represent an area on the screen, a pygame.Rect object can only store integral data.

The coordinates for Rect objects are all integers. [...]

The fraction part of the movement gets lost when the position of the object incremented:

self.enemy_rect.x += ene_x * self.ENEMY_ACCELERATION
self.enemy_rect.y += ene_y * self.ENEMY_ACCELERATION

If you want to store object positions with floating point accuracy, you have to store the location of the object in separate variables respectively attributes and to synchronize the pygame.Rect object. round the coordinates and assign it to the location (e.g. .topleft) of the rectangle:

x, y = # floating point coordinates
rect.topleft = round(x), round(y)

Add floating point coordinates to the Enemy class:

class Enemy:

    def __init__(self, enemy_y, enemy_x):
        # [...]

        self.enemy_rect = pygame.Rect(enemy_x, enemy_y, self.ENEMY_HEIGHT, self.ENEMY_WIDTH)
        self.x, self.y = self.enemy_rect.topleft

        # [...]
        

    def enemyMovement(self, player_x, player_y):
        ene_x, ene_y = player_x - self.x, player_y - self.y
        dist = math.hypot(ene_x, ene_y)
        ene_x, ene_y = ene_x / dist, ene_y / dist

        self.x += ene_x * self.ENEMY_ACCELERATION
        self.y += ene_y * self.ENEMY_ACCELERATION
        self.enemy_rect = round(self.x), round(self.y)