喫蘋果小遊戲（Python）

1.公共類模塊

import pygame
from pygame.rect import Rect


def print_text(font, x, y, text, color=(255, 255, 255)):
    imgText=font.render(text, True, color)
    screen=pygame.display.get_surface()
    screen.blit(imgText,(x, y))

class MySprite(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        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 = 0
        self.last_time = 1
        self.direction = 0
        self.velocity = 0

    def _getx(self): return self.rect.x
    def _gety(self): return self.rect.y

    def _setx(self, value): self.rect.x = value
    def _sety(self, value): self.rect.y = value
    """
    描述
    property() 函數的作用是在新式類中返回屬性值。
    
    語法
    以下是 property() 方法的語法:
    
    class property([fget[, fset[, fdel[, doc]]]])
    參數
    fget -- 獲取屬性值的函數
    fset -- 設置屬性值的函數
    fdel -- 刪除屬性值函數
    doc -- 屬性描述信息
    返回值
    返回新式類屬性。
    """
    X = property(_getx, _setx)
    Y = property(_gety, _sety)

    #位置屬性
    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_height = height
        self.frame_width = width
        self.rect = Rect(0, 0, width, height)
        self.columns = columns

        rect = self.master_image.get_rect()
        self.last_frame = (rect.width//width)*(rect.height//height) - 1

    def update(self, current_time, rate=30):
        #跟新動畫幀
        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
        #僅當更改時才創建幀
        if self.frame != self.old_frame:
            frame_x = (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
class Point(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y
    def getx(self): return self.x
    def gety(self): return self.y
    def setx(self,value): self.x=value
    def sety(self,value): self.y=value

    x=property(getx,setx)
    y=property(gety,sety)

    def __str__(self):
        return 'x:'+"{:.0f}".format(self.x) + 'y:'+"{:.0f}".format(self.y)

2.首先生成隨機蘋果，然後監聽鍵盤移動，播放動畫。精靈和蘋果碰撞檢測，檢測是喫掉蘋果

import pygame
from pygame.rect import Rect

from . import MyLibrary
import random
import sys


def calc_velocity(direction, vel=1.0):
    velocity = MyLibrary.Point(0, 0)
    if direction == 0:#上
        velocity.y = -vel
    elif direction == 2:#右
        velocity.x = vel
    elif direction == 4:#下
        velocity.y == vel
    elif direction == 6:#左
        velocity.x == -vel
    return velocity

pygame.init()
screen = pygame.display.set_mode(800,600)
font=pygame.font.Font(None, 36)
timer=pygame.time.Clock()

#創建精靈組
player_group=pygame.sprite.Group()
food_group=pygame.sprite.Group()

#初始化玩家精靈組
player=MyLibrary.MySprite()
player.load('farmer.png',96,96,8)############-----------------圖片
player.position=80, 80
player.direction= 4
player_group.add(player)

#初始化food精靈組
for n in range(1, 50):
    food= MyLibrary.MySprite()
    food.load('food.png',35,35,1) #################-----------食物圖片
    food.position=random.randint(0, 780), random.randint(0, 580)
    food_group.add(food)

game_over= False
player_moving = False
plyer_health = False

while True:
    timer.tick(30)
    ticks = pygame.time.get_ticks()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    keys = pygame.key.get_pressed()
    if keys[pygame.key.K_UP]:
        player.direction=0
        player_moving = True
    elif keys[pygame.key.k_DOWN]:
        player_moving = True
        player.direction=4
    elif keys[pygame.key.K_RIGHT]:
        player.direction = 2
        player_moving = True
    elif keys[pygame.key.K_LEFT]:
        player.direction = 6
        player_moving = True
    else:
        player_moving = False

    if not game_over:
        # 根據不同的方向，角色移動不同的動畫幀
        player.first_frame = player.direction*player.columns
        player.last_time = player.first_frame + player.columns -1
        if player.frame < player.first_frame:
            player.frame = player.first_frame

        if not player_moving:
            #停止更新動畫幀
            player.frame = player.first_frame=player.last_frame
        else:
            player.velocity = calc_velocity(player.direction,1.5)
            player.velocity.x*=1.5
            player.velocity.y*=1.5

        #跟新玩家精靈組
        player_group.update(ticks,50)

        #移動玩家
        if player_moving:
            player.X += player.velocity.x
            player.Y += player.velocity.y
            if player.X < 0: player.X = 0
            elif player.X >700: player.X =700
            if player.Y < 0: player.Y = 0
            elif player.Y >500:player.Y =500

        #檢測玩家是否與食物衝突，是否喫到蘋果
        attacker = None
        attacker = pygame.sprite.spritecollideany(player,food_group)
        if attacker != None:
            if pygame.sprite.collide_circle_ratio(0.65)(player,food_group):
                plyer_health += 2
                food_group.remove(attacker)
        if plyer_health > 100:
            plyer_health=100
            #跟新食物精靈組
            food_group.update(ticks, 50)
            if food_group.__len__() == 0:
                game_over = True

        screen.fill((50,50,100))
        food_group.draw(screen)
        player_group.draw(screen)

        pygame.draw.rect(screen,(510,150,50,180),Rect(300,570,plyer_health*2,25))
        pygame.draw.rect(screen, (100, 200, 100, 180), Rect(300, 570, 200, 2))

        if game_over:
            MyLibrary.print_text(font, 300, 100,'Game Over!')
        pygame.display.update()