Python实现打砖块小游戏代码实例
这次用Python实现的是一个接球打砖块的小游戏,需要导入pygame模块,有以下两条经验总结:
1.多父类的继承2.碰撞检测的数学模型
知识点稍后再说,我们先看看游戏的效果和实现:
一、游戏效果
二、游戏代码
#导入模块 import pygame from pygame.locals import * import sys,random,time,math class GameWindow(object): '''创建游戏窗口类''' def __init__(self,*args,**kw): self.window_length = 600 self.window_wide = 500 #绘制游戏窗口,设置窗口尺寸 self.game_window = pygame.display.set_mode((self.window_length,self.window_wide)) #设置游戏窗口标题 pygame.display.set_caption("CatchBallGame") #定义游戏窗口背景颜色参数 self.window_color = (135,206,250) def backgroud(self): #绘制游戏窗口背景颜色 self.game_window.fill(self.window_color) class Ball(object): '''创建球类''' def __init__(self,*args,**kw): #设置球的半径、颜色、移动速度参数 self.ball_color = (255,215,0) self.move_x = 1 self.move_y = 1 self.radius = 10 def ballready(self): #设置球的初始位置、 self.ball_x = self.mouse_x self.ball_y = self.window_wide-self.rect_wide-self.radius #绘制球,设置反弹触发条件 pygame.draw.circle(self.game_window,self.ball_color,(self.ball_x,self.ball_y),self.radius) def ballmove(self): #绘制球,设置反弹触发条件 pygame.draw.circle(self.game_window,self.ball_color,(self.ball_x,self.ball_y),self.radius) self.ball_x += self.move_x self.ball_y -= self.move_y #调用碰撞检测函数 self.ball_window() self.ball_rect() #每接5次球球速增加一倍 if self.distance < self.radius: self.frequency += 1 if self.frequency == 5: self.frequency = 0 self.move_x += self.move_x self.move_y += self.move_y self.point += self.point #设置游戏失败条件 if self.ball_y > 520: self.gameover = self.over_font.render("Game Over",False,(0,0,0)) self.game_window.blit(self.gameover,(100,130)) self.over_sign = 1 class Rect(object): '''创建球拍类''' def __init__(self,*args,**kw): #设置球拍颜色参数 self.rect_color = (255,0,0) self.rect_length = 100 self.rect_wide = 10 def rectmove(self): #获取鼠标位置参数 self.mouse_x,self.mouse_y = pygame.mouse.get_pos() #绘制球拍,限定横向边界 if self.mouse_x >= self.window_length-self.rect_length//2: self.mouse_x = self.window_length-self.rect_length//2 if self.mouse_x <= self.rect_length//2: self.mouse_x = self.rect_length//2 pygame.draw.rect(self.game_window,self.rect_color,((self.mouse_x-self.rect_length//2),(self.window_wide-self.rect_wide),self.rect_length,self.rect_wide)) class Brick(object): def __init__(self,*args,**kw): #设置砖块颜色参数 self.brick_color = (139,126,102) self.brick_list = [[1,1,1,1,1,1],[1,1,1,1,1,1],[1,1,1,1,1,1],[1,1,1,1,1,1],[1,1,1,1,1,1]] self.brick_length = 80 self.brick_wide = 20 def brickarrange(self): for i in range(5): for j in range(6): self.brick_x = j*(self.brick_length+24) self.brick_y = i*(self.brick_wide+20)+40 if self.brick_list[i][j] == 1: #绘制砖块 pygame.draw.rect(self.game_window,self.brick_color,(self.brick_x,self.brick_y,self.brick_length,self.brick_wide)) #调用碰撞检测函数 self.ball_brick() if self.distanceb < self.radius: self.brick_list[i][j] = 0 self.score += self.point #设置游戏胜利条件 if self.brick_list == [[0,0,0,0,0,0],[0,0,0,0,0,0],[0,0,0,0,0,0],[0,0,0,0,0,0],[0,0,0,0,0,0]]: self.win = self.win_font.render("You Win",False,(0,0,0)) self.game_window.blit(self.win,(100,130)) self.win_sign = 1 class Score(object): '''创建分数类''' def __init__(self,*args,**kw): #设置初始分数 self.score = 0 #设置分数字体 self.score_font = pygame.font.SysFont('arial',20) #设置初始加分点数 self.point = 1 #设置初始接球次数 self.frequency = 0 def countscore(self): #绘制玩家分数 my_score = self.score_font.render(str(self.score),False,(255,255,255)) self.game_window.blit(my_score,(555,15)) class GameOver(object): '''创建游戏结束类''' def __init__(self,*args,**kw): #设置Game Over字体 self.over_font = pygame.font.SysFont('arial',80) #定义GameOver标识 self.over_sign = 0 class Win(object): '''创建游戏胜利类''' def __init__(self,*args,**kw): #设置You Win字体 self.win_font = pygame.font.SysFont('arial',80) #定义Win标识 self.win_sign = 0 class Collision(object): '''碰撞检测类''' #球与窗口边框的碰撞检测 def ball_window(self): if self.ball_x <= self.radius or self.ball_x >= (self.window_length-self.radius): self.move_x = -self.move_x if self.ball_y <= self.radius: self.move_y = -self.move_y #球与球拍的碰撞检测 def ball_rect(self): #定义碰撞标识 self.collision_sign_x = 0 self.collision_sign_y = 0 if self.ball_x < (self.mouse_x-self.rect_length//2): self.closestpoint_x = self.mouse_x-self.rect_length//2 self.collision_sign_x = 1 elif self.ball_x > (self.mouse_x+self.rect_length//2): self.closestpoint_x = self.mouse_x+self.rect_length//2 self.collision_sign_x = 2 else: self.closestpoint_x = self.ball_x self.collision_sign_x = 3 if self.ball_y < (self.window_wide-self.rect_wide): self.closestpoint_y = (self.window_wide-self.rect_wide) self.collision_sign_y = 1 elif self.ball_y > self.window_wide: self.closestpoint_y = self.window_wide self.collision_sign_y = 2 else: self.closestpoint_y = self.ball_y self.collision_sign_y = 3 #定义球拍到圆心最近点与圆心的距离 self.distance = math.sqrt(math.pow(self.closestpoint_x-self.ball_x,2)+math.pow(self.closestpoint_y-self.ball_y,2)) #球在球拍上左、上中、上右3种情况的碰撞检测 if self.distance < self.radius and self.collision_sign_y == 1 and (self.collision_sign_x == 1 or self.collision_sign_x == 2): if self.collision_sign_x == 1 and self.move_x > 0: self.move_x = - self.move_x self.move_y = - self.move_y if self.collision_sign_x == 1 and self.move_x < 0: self.move_y = - self.move_y if self.collision_sign_x == 2 and self.move_x < 0: self.move_x = - self.move_x self.move_y = - self.move_y if self.collision_sign_x == 2 and self.move_x > 0: self.move_y = - self.move_y if self.distance < self.radius and self.collision_sign_y == 1 and self.collision_sign_x == 3: self.move_y = - self.move_y #球在球拍左、右两侧中间的碰撞检测 if self.distance < self.radius and self.collision_sign_y == 3: self.move_x = - self.move_x #球与砖块的碰撞检测 def ball_brick(self): #定义碰撞标识 self.collision_sign_bx = 0 self.collision_sign_by = 0 if self.ball_x < self.brick_x: self.closestpoint_bx = self.brick_x self.collision_sign_bx = 1 elif self.ball_x > self.brick_x+self.brick_length: self.closestpoint_bx = self.brick_x+self.brick_length self.collision_sign_bx = 2 else: self.closestpoint_bx = self.ball_x self.collision_sign_bx = 3 if self.ball_y < self.brick_y: self.closestpoint_by = self.brick_y self.collision_sign_by = 1 elif self.ball_y > self.brick_y+self.brick_wide: self.closestpoint_by = self.brick_y+self.brick_wide self.collision_sign_by = 2 else: self.closestpoint_by = self.ball_y self.collision_sign_by = 3 #定义砖块到圆心最近点与圆心的距离 self.distanceb = math.sqrt(math.pow(self.closestpoint_bx-self.ball_x,2)+math.pow(self.closestpoint_by-self.ball_y,2)) #球在砖块上左、上中、上右3种情况的碰撞检测 if self.distanceb < self.radius and self.collision_sign_by == 1 and (self.collision_sign_bx == 1 or self.collision_sign_bx == 2): if self.collision_sign_bx == 1 and self.move_x > 0: self.move_x = - self.move_x self.move_y = - self.move_y if self.collision_sign_bx == 1 and self.move_x < 0: self.move_y = - self.move_y if self.collision_sign_bx == 2 and self.move_x < 0: self.move_x = - self.move_x self.move_y = - self.move_y if self.collision_sign_bx == 2 and self.move_x > 0: self.move_y = - self.move_y if self.distanceb < self.radius and self.collision_sign_by == 1 and self.collision_sign_bx == 3: self.move_y = - self.move_y #球在砖块下左、下中、下右3种情况的碰撞检测 if self.distanceb < self.radius and self.collision_sign_by == 2 and (self.collision_sign_bx == 1 or self.collision_sign_bx == 2): if self.collision_sign_bx == 1 and self.move_x > 0: self.move_x = - self.move_x self.move_y = - self.move_y if self.collision_sign_bx == 1 and self.move_x < 0: self.move_y = - self.move_y if self.collision_sign_bx == 2 and self.move_x < 0: self.move_x = - self.move_x self.move_y = - self.move_y if self.collision_sign_bx == 2 and self.move_x > 0: self.move_y = - self.move_y if self.distanceb < self.radius and self.collision_sign_by == 2 and self.collision_sign_bx == 3: self.move_y = - self.move_y #球在砖块左、右两侧中间的碰撞检测 if self.distanceb < self.radius and self.collision_sign_by == 3: self.move_x = - self.move_x class Main(GameWindow,Rect,Ball,Brick,Collision,Score,Win,GameOver): '''创建主程序类''' def __init__(self,*args,**kw): super(Main,self).__init__(*args,**kw) super(GameWindow,self).__init__(*args,**kw) super(Rect,self).__init__(*args,**kw) super(Ball,self).__init__(*args,**kw) super(Brick,self).__init__(*args,**kw) super(Collision,self).__init__(*args,**kw) super(Score,self).__init__(*args,**kw) super(Win,self).__init__(*args,**kw) #定义游戏开始标识 start_sign = 0 while True: self.backgroud() self.rectmove() self.countscore() if self.over_sign == 1 or self.win_sign == 1: break #获取游戏窗口状态 for event in pygame.event.get(): if event.type == pygame.QUIT: sys.exit() if event.type == MOUSEBUTTONDOWN: pressed_array = pygame.mouse.get_pressed() if pressed_array[0]: start_sign = 1 if start_sign == 0: self.ballready() else: self.ballmove() self.brickarrange() #更新游戏窗口 pygame.display.update() #控制游戏窗口刷新频率 time.sleep(0.010) if __name__ == '__main__': pygame.init() pygame.font.init() catchball = Main()
三、知识点1.多父类的继承
Python的继承方式分为深度优先和广度优先,Python2分经典类的深度优先搜索继承方式(class A:)、 新式类的广度优先搜索继承方式(class A(object):)2种,Python3经典类与新式类的继承方式与python2的新式类继承方式一致,都为广度优先的继承方式。
经典类的深度优先搜索继承方式:
如图所示
class B(A)
class C(A)
class D(B,C)
(1)若D类有构造函数,则重写所有父类的继承
(2)若D类没有构造函数,B类有构造函数,则D类会继承B类的构造函数
(3)若D类没有构造函数,B类也没有构造函数,则D类会继承 A类的构造函数,而不是C类的构造函数
(4)若D类没有构造函数,B类也没有构造函数,A类也没有构造函数,则D类才会继承C类的构造函数
新式类的广度优先搜索继承方式:
如图所示
class B(A)
class C(A)
class D(B,C)
(1)若D类有构造函数,则重写所有父类的继承
(2)若D类没有构造函数,B类有构造函数,则D类会继承B类的构造函数
(3)若D类没有构造函数,B类也没有构造函数,则D类会继承 C类的构造函数,而不是A类的构造函数
(4)若D类没有构造函数,B类也没有构造函数,C类也没有构造函数,则D类才会继承A类的构造函数
通过上面的分析,大家应该清楚了Python中类的继承顺序,那么问题来了,如果我不想重写父类的构造函数,要子类和父类的构造函数都生效怎么办?解决办法需要用到super关键字,对直接父类对象的引用,可以通过super来访问父类中被子类覆盖的方法或属性。
class A(object): def __init__(self,*args,**kw) class B(A): def __init__(self,*args,**kw) super(B,self).__init__(*args,**kw) class C(A): def __init__(self,*args,**kw) super(C,self).__init__(*args,**kw) class D(B,C): def __init__(self,*args,**kw) super(D,self).__init__(*args,**kw) super(B,self).__init__(*args,**kw)
2.碰撞检测的数学模型
其实,编程问题到最后就是数学问题,这个游戏涉及到2D圆形与矩形的碰撞检测问题:
碰撞检测原理:通过找出矩形上离圆心最近的点,然后通过判断该点与圆心的距离是否小于圆的半径,若小于则为碰撞。
那如何找出矩形上离圆心最近的点呢?下面我们从 x 轴、y 轴两个方向分别进行寻找。为了方便描述,我们先约定以下变量:
(1)矩形上离圆心最近的点为变量:closestpoint = [x, y]
(2)矩形 rect = [x, y, l, w] 左上角与长宽 length,wide
(3)圆形 circle = [x, y, r] 圆心与半径
首先是 x 轴:
如果圆心在矩形的左侧(if circle_x < rect_x),那么 closestpoint_x = rect_x。
如果圆心在矩形的右侧(elif circle_x > rect_x + rect_l),那么 closestpoint_x = rect_x + rect_l。
如果圆心在矩形的正上下方(else),那么 closestpoint_x = circle_x。
同理,对于 y 轴:
如果圆心在矩形的上方(if circle_y < rect_y),那么 closestpoint_y = rect_y。
如果圆心在矩形的下方(elif circle_y > rect_y + rect_w)),那么 closestpoint_y = rect_y + rect_w。
圆形圆心在矩形的正左右两侧(else),那么 closestpoint_y = circle_y。
因此,通过上述方法即可找出矩形上离圆心最近的点了,然后通过“两点之间的距离公式”得出“最近点”与“圆心”的距离,最后将其与圆的半径相比,即可判断是否发生碰撞。
distance=math.sqrt(math.pow(closestpoint_x-circle_x,2)+math.pow(closestpoint_y-circle_y,2))
if distance < circle.r :
return True – 发生碰撞
else :
return False – 未发生碰撞
以上所述是小编给大家介绍的Python打砖块小游戏详解整合,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对亿速云网站的支持!