Escape The Dragon Game

Chapter 7

import 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 class
    self.master_image = None
    self.frame = 0
    self.old_frame = -1
    self.frame_width = 1
    self.frame_height = 1
    self.first_frame = 0
    self.last_frame = 0
    self.columns = 1
    self.last_time = 0
    self.score=0
#X property
def _getx(self): return self.rect.x
def _setx(self,value): self.rect.x = value
X = property(_getx,_setx)
#Y property
def _gety(self): return self.rect.y
def _sety(self,value): self.rect.y = value
Y = property(_gety,_sety)
#position property
def _getpos(self): return self.rect.topleft
def _setpos(self,pos): self.rect.topleft = pos
position = property(_getpos,_setpos)
def load(self, filename, width, height, columns):
    self.master_image = pygame.image.load(filename).convert_alpha()
    self.frame_width = width
    self.frame_height = height
    self.rect = Rect(0,0,width,height)
    self.columns = columns
    #try to auto-calculate total frames
    rect = self.master_image.get_rect()
    self.last_frame = (rect.width // width) * (rect.height // height) - 1
def update(self, current_time, rate=30):
    #update animation frame number
    if current_time > self.last_time + rate:
        self.frame += 1
        if self.frame > self.last_frame:
            self.frame = self.first_frame
        self.last_time = current_time
    #build current frame only if it changed
    if self.frame != self.old_frame:
        frame_x =[农产品期货](https://www.gendan5.com/cf/af.html) (self.frame % self.columns) * self.frame_width
        frame_y = (self.frame // self.columns) * self.frame_height
        rect = Rect(frame_x, frame_y, self.frame_width, self.frame_height)
        self.image = self.master_image.subsurface(rect)
        self.old_frame = self.frame
def __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 = True
        jump_vel = -8.0
elif keys[K_d]:
    lst=list(player.position)
    lst[0]+=5
    player.position=tuple(lst)
elif keys[K_a]:
    lst=list(player.position)
    lst[0]-=5
    player.position=tuple(lst)      
#update the arrow
if not game_over:
    arrow.X -= arrow_vel
    if arrow.X < -40: reset_arrow()
#did arrow hit player?
if pygame.sprite.collide_rect(arrow, player):
    reset_arrow()
    player.life-=1
    player.X -= 10
#did arrow hit dragon?
if pygame.sprite.collide_rect(arrow, dragon):
    reset_arrow()
    dragon.X -= 10
    player.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 = True
    game_over = True
#is the player jumping?
if player_jumping:
    player.Y += jump_vel
    jump_vel += 0.5
    if player.Y > player_start_y:
        player_jumping = False
        player.Y = player_start_y
        jump_vel = 0.0
key_pressed = pygame.key.get_pressed()
if key_pressed[pygame.K_SPACE]:
    jump_vel-=0.3
#draw the background
screen.blit(bg, (0,0))
print_text(font1, 320, 160, "Your score:"+str(player.score))
#update sprites
if not game_over:
    group.update(ticks, 50)
#draw sprites
group.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()