import arcade

SCREEN_WIDTH = 900  # ширина экрана
SCREEN_HEIGHT = 600  # высота экрана
SCREEN_TITLE = "Пинг-понг"
BG_COLOR = (161, 183, 56)

SPEEDX = 5
SPEEDY = 5
BALL_IMG = "ping-pong/images/ball.png"
BALL_SCALE = 0.1

PLAT_IMG = "ping-pong/images/platform.png"
PLAT_SCALE = 0.1


class Ball(arcade.Sprite):
    def update(self):
        self.center_x += self.change_x
        if self.right > SCREEN_WIDTH or self.left < 0:
            self.change_x = - self.change_x
        self.center_y += self.change_y
        if self.top > SCREEN_HEIGHT or self.bottom < 0:
            self.change_y = - self.change_y


class Platform(arcade.Sprite):
    def update(self):
        self.center_x += self.change_x


class GameWindow(arcade.Window):
    # конструктор
    def __init__(self, width, height, title):
        super().__init__(width, height, title)
        self.ball = Ball(BALL_IMG, BALL_SCALE)
        self.ball.center_x = SCREEN_WIDTH/2
        self.ball.center_y = SCREEN_HEIGHT/2
        self.ball.change_x = SPEEDX
        self.ball.change_y = SPEEDY
        self.platform = Platform(PLAT_IMG, PLAT_SCALE)
        self.platform.center_x = SCREEN_WIDTH/2
        self.platform.center_y = SCREEN_HEIGHT/12

    # отрисовка
    def on_draw(self):
        arcade.start_render()  # начало отрисовка
        arcade.set_background_color(BG_COLOR)
        self.ball.draw()
        self.platform.draw()

    # обновление окна, игровая логика
    def on_update(self, delta_time: float):
        self.ball.update()
        self.platform.update()
        if self.ball.bottom < self.platform.top :
            self.ball.change_y = - self.ball.change_y


window = GameWindow(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
arcade.run()