import pgzrun
import random
from pgzhelper import *

# 游戏窗口大小
WIDTH = 1500
HEIGHT = 800

# 创建背景角色
bg1 = Actor('连续道路', topleft = (0,0))
bg2 = Actor('连续道路', topleft = (1500,0))

# 创建障碍物
obstacles = []
for _ in range(3):  # 障碍物数量
    x = random.randint(WIDTH, WIDTH + 1500)  # 障碍物出现在屏幕右侧外
    y = random.randint(100, HEIGHT - 50)
    obstacles.append(Actor('路障', (x, y)))

# 创建摩托车
motor = Actor('摩托1', (200, HEIGHT // 2))
# 将摩托造型存放在列表内 
motor.images = ['摩托1','摩托2']

# 初始化设置
speed = 15

def draw():
    # 绘制连续背景
    bg1.draw()
    bg2.draw()
    # 绘制障碍物
    for obs in obstacles:
        obs.draw()
    # 绘制摩托
    motor.draw()        

# 背景、终点线移动
def bg_move():
    bg1.x -= speed
    bg2.x -= speed
    if bg1.right <= 0:
        bg1.left = bg2.right
    if bg2.right <= 0:
        bg2.left = bg1.right

# 更新障碍物位置
def obs_move(): 
    for obs in obstacles:
        obs.x -= speed  # 障碍物随背景一起移动
        if obs.x < 0:
            obs.x = random.randint(WIDTH, WIDTH + 1500)  # 障碍物继续出现在屏幕外
            obs.y = random.randint(100, HEIGHT - 50)

def update():
    bg_move()
    obs_move()
    # 控制赛车移动，限制不能出界
    if keyboard.up and motor.top > 0:
        motor.y -= 7
    if keyboard.down and motor.bottom < HEIGHT-50:
        motor.y += 7
        
def change_image():
    motor.next_image()
clock.schedule_interval(change_image,0.2)

pgzrun.go()