'''
如何設計使用隨機變數來賽馬，當兩匹馬平手時算第一批馬獲勝
by Ching-Shoei Chiang
'''
import random, pygame, sys
from pygame.locals import *

pygame.init()
FPS = 30 # frames per second setting
fpsClock = pygame.time.Clock()
# set up the window
screen = pygame.display.set_mode((800, 200), 0, 32)
pygame.display.set_caption('Animation')
WHITE = (255, 255, 255)
horse1Img = pygame.image.load('image1.jpg')
horse2Img = pygame.image.load('image2.jpg')
horse1x = horse1y = 0
horse2x = 0
horse2y = 100
notend = True
winner = 0
while notend: # the main game loop
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    screen.fill(WHITE)
    horse1x = horse1x + random.randint(1,3)
    horse2x = horse2x + random.randint(1,3)
    if horse2x > 650:   
        winner = 2
        notend = False
    if horse1x > 650:
        winner = 1   # 平手算第一個贏
        notend = False 
    if winner == 0:
        screen.blit(horse1Img, (horse1x, horse1y))
        screen.blit(horse2Img, (horse2x, horse2y))
    elif winner == 1:
        screen.blit(horse1Img, (horse1x, horse1y))
    else:
        screen.blit(horse2Img, (horse2x, horse2y))

    pygame.display.update()
    fpsClock.tick(FPS)