《Python游戏编程入门》7.4习题

1、修改本章的游戏，以便每次玩家跳过火箭而没有被击中的时候，都给他计分

2、进一步修改游戏，使得当按下空格键更长时间的时候，可以让玩家跳的更高。

3、最后，给MySprite类添加一个新的功能。可以是想要让他更完善的任何新功能。

添加了分数，添加了小人按下空格不松手会跳的更高，主要是检测如果小人已经跳起并且键盘空格仍然按下则会给跳起的速度加上适当的值。

#is the player jumping?if player_jumping:player.Y += jump_veljump_vel += 0.5if player.Y > player_start_y:player_jumping = Falseplayer.Y = player_start_yjump_vel = 0.0key_pressed = pygame.key.get_pressed()if key_pressed[pygame.K_SPACE]:jump_vel-=0.3

另外添加了小人按下“A”“D”可以左右移动，为了游戏平衡增加了小人被火焰击中三次后游戏结束。

值得一说的是源码给出的是元组而不是列表来进行位置的定义，为了能让小人移动需要先转化为列表修改后再转化为元组，避免了过多的修改源码。

keys = pygame.key.get_pressed()if keys[K_ESCAPE]: sys.exit()elif keys[K_SPACE]:if not player_jumping:player_jumping = Truejump_vel = -8.0elif keys[K_d]:lst=list(player.position)lst[0]+=5player.position=tuple(lst)elif keys[K_a]:lst=list(player.position)lst[0]-=5player.position=tuple(lst)

有个小想法就是多添加几枚子弹，笔者的想法是把子弹专门定义一个类来生成，毕竟雷电那种游戏满屏子弹不能每个都全局定义吧，欢迎大佬交流。

# Escape The Dragon Game
# Chapter 7import sys, time, random, math, pygame
from pygame.locals import *class MySprite(pygame.sprite.Sprite):def __init__(self, target):pygame.sprite.Sprite.__init__(self) #extend the base Sprite classself.master_image = Noneself.frame = 0self.old_frame = -1self.frame_width = 1self.frame_height = 1self.first_frame = 0self.last_frame = 0self.columns = 1self.last_time = 0self.score=0#X propertydef _getx(self): return self.rect.xdef _setx(self,value): self.rect.x = valueX = property(_getx,_setx)#Y propertydef _gety(self): return self.rect.ydef _sety(self,value): self.rect.y = valueY = property(_gety,_sety)#position propertydef _getpos(self): return self.rect.topleftdef _setpos(self,pos): self.rect.topleft = posposition = property(_getpos,_setpos)def load(self, filename, width, height, columns):self.master_image = pygame.image.load(filename).convert_alpha()self.frame_width = widthself.frame_height = heightself.rect = Rect(0,0,width,height)self.columns = columns#try to auto-calculate total framesrect = self.master_image.get_rect()self.last_frame = (rect.width // width) * (rect.height // height) - 1def update(self, current_time, rate=30):#update animation frame numberif current_time > self.last_time + rate:self.frame += 1if self.frame > self.last_frame:self.frame = self.first_frameself.last_time = current_time#build current frame only if it changedif self.frame != self.old_frame:frame_x = (self.frame % self.columns) * self.frame_widthframe_y = (self.frame // self.columns) * self.frame_heightrect = Rect(frame_x, frame_y, self.frame_width, self.frame_height)self.image = self.master_image.subsurface(rect)self.old_frame = self.framedef __str__(self):return str(self.frame) + "," + str(self.first_frame) + \"," + str(self.last_frame) + "," + str(self.frame_width) + \"," + str(self.frame_height) + "," + str(self.columns) + \"," + str(self.rect)def print_text(font, x, y, text, color=(255,255,255)):imgText = font.render(text, True, color)screen.blit(imgText, (x,y))def reset_arrow():y = random.randint(250,350)arrow.position = 800,y#main program begins
pygame.init()
screen = pygame.display.set_mode((800,600))
pygame.display.set_caption("Escape The Dragon Game")
font = pygame.font.Font(None, 18)
font1 = pygame.font.Font(None, 38)
framerate = pygame.time.Clock()#load bitmaps
bg = pygame.image.load("background.png").convert_alpha()#create a sprite group
group = pygame.sprite.Group()#create the dragon sprite
dragon = MySprite(screen)
dragon.load("dragon.png", 260, 150, 3)
dragon.position = 100, 230
group.add(dragon)#create the player sprite
player = MySprite(screen)
player.load("caveman.png", 50, 64, 8)
player.first_frame = 1
player.last_frame = 7
player.position = 400, 303
player.score=0
player.life=3
group.add(player)#create the arrow sprite
arrow = MySprite(screen)
arrow.load("flame.png", 40, 16, 1)
arrow.position = 800,320
group.add(arrow)arrow_vel = 10.0
game_over = False
you_win = False
player_jumping = False
jump_vel = 0.0
player_start_y = player.Y#repeating loop
while True:framerate.tick(30)ticks = pygame.time.get_ticks()for event in pygame.event.get():if event.type == QUIT: sys.exit()keys = pygame.key.get_pressed()if keys[K_ESCAPE]: sys.exit()elif keys[K_SPACE]:if not player_jumping:player_jumping = Truejump_vel = -8.0elif keys[K_d]:lst=list(player.position)lst[0]+=5player.position=tuple(lst)elif keys[K_a]:lst=list(player.position)lst[0]-=5player.position=tuple(lst)      #update the arrowif not game_over:arrow.X -= arrow_velif arrow.X < -40: reset_arrow()#did arrow hit player?if pygame.sprite.collide_rect(arrow, player):reset_arrow()player.life-=1player.X -= 10#did arrow hit dragon?if pygame.sprite.collide_rect(arrow, dragon):reset_arrow()dragon.X -= 10player.score+=10#did the play died?if player.life ==0:game_over=True#did dragon eat the player?if pygame.sprite.collide_rect(player, dragon):game_over = True#did the dragon get defeated?if dragon.X < -100:you_win = Truegame_over = True#is the player jumping?if player_jumping:player.Y += jump_veljump_vel += 0.5if player.Y > player_start_y:player_jumping = Falseplayer.Y = player_start_yjump_vel = 0.0key_pressed = pygame.key.get_pressed()if key_pressed[pygame.K_SPACE]:jump_vel-=0.3#draw the backgroundscreen.blit(bg, (0,0))print_text(font1, 320, 160, "Your score:"+str(player.score))#update spritesif not game_over:group.update(ticks, 50)#draw spritesgroup.draw(screen)print_text(font, 350, 560, "Press SPACE to jump!")if game_over:print_text(font, 360, 100, "G A M E   O V E R")if you_win:print_text(font, 330, 130, "YOU BEAT THE DRAGON!")else:print_text(font, 330, 130, "THE DRAGON GOT YOU!")pygame.display.update()

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