'''
如何設計使用隨機變數來賽馬，此程式表達賽馬時馬的細膩動作
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, 150), 0, 32)
pygame.display.set_caption('Animation')
WHITE = (255, 255, 255)
horsex = horsey = 0

notend = True
i = 0
while notend: # the main game loop
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    screen.fill(WHITE)
    horseImg = pygame.image.load('image'+str(i)+'.jpg')
    i = (i+1)%15
    horsex = horsex + random.randint(1,3)
    if horsex > 650:
        notend = False 
 
    screen.blit(horseImg, (horsex, horsey))

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