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']

# 创建终点线
line = Actor('终点线', topleft = (20000, 163))

# 初始化设置
speed = 15
flag = 0

def draw():
    # 绘制连续背景
    bg1.draw()
    bg2.draw()
    if flag == 1:
        music.stop()
        screen.blit('摩托成功', (0,0))
    elif flag == 2:
        music.stop()
        screen.blit('摩托失败', (0,0))
    else:
        # 绘制障碍物
        for obs in obstacles:
            obs.draw() 
        # 绘制摩托
        motor.draw()
        # 绘制终点线
        line.draw() 
        # 绘制距离文字
        x = int(line.x-motor.x)
        screen.draw.text(f'距终点：{x} m', (50,700), fontname = 'simkai', fontsize = 50)

# 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
    line.x -= speed     

# 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)

# 最后冲刺
def line_collide():
    global flag
    if motor.collide_pixel(line):
        flag = 1
        sounds.胜利.play()
    else:
        motor.x += 15

# 判断是否与障碍物相撞
def obs_collide():
    global flag
    for obs in obstacles:
        if motor.collide_pixel(obs):
            flag = 2
            sounds.失败.play()
            
def update():
    if flag == 0:  
        if line.x > WIDTH - 200:   # 正常行驶
            bg_move()
            obs_move()
        else:    # 最后冲刺
            line_collide()  
        # 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
        # 是否碰撞障碍物
        obs_collide()
        
def change_image():
    motor.next_image()
clock.schedule_interval(change_image,0.2)
music.play('速度与激情')

pgzrun.go()