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Python — Racing — Этап 11 — несколько соперников и простое столкновение

Фрагмент из «Python — Racing»: Этап 11 — несколько соперников и простое столкновение.

python spinoffencyclopedia9-04-razrabotka-igr-praktikum-razrabotki-igr-4 embed URL статья в энциклопедии
Python main.py 
def collide_with(self, other):
    r1 = pygame.Rect(0, 0, self.width, self.height)
    r1.center = (int(self.x), int(self.y))
    r2 = pygame.Rect(0, 0, other.width, other.height)
    r2.center = (int(other.x), int(other.y))
    if r1.colliderect(r2):
        dx = self.x - other.x
        dy = self.y - other.y
        if dx == 0 and dy == 0:
            dx = 1
        length = math.hypot(dx, dy)
        push = 3.0
        self.x += (dx / length) * push
        self.y += (dy / length) * push
        self.speed *= 0.85
        other.speed *= 0.85
def collide_with(self, other):
    r1 = pygame.Rect(0, 0, self.width, self.height)
    r1.center = (int(self.x), int(self.y))
    r2 = pygame.Rect(0, 0, other.width, other.height)
    r2.center = (int(other.x), int(other.y))
    if r1.colliderect(r2):
        dx = self.x - other.x
        dy = self.y - other.y
        if dx == 0 and dy == 0:
            dx = 1
        length = math.hypot(dx, dy)
        push = 3.0
        self.x += (dx / length) * push
        self.y += (dy / length) * push
        self.speed *= 0.85
        other.speed *= 0.85