怎么使用Python的Pymunk实现用鼠标创建小球

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本次需要的外置包：pygame，pymunk，cmd运行该命令安装：

pip install pygamepip install pymunk

首先，导入

import pymunkimport pygamefrom pygame.locals import *import sysimport random as rd

结合pygame，创建若干障碍，并设置重力、弹跳力等参数 

class Demo:    WIDTH=800    HEIGHT=800    def __init__(self):        pygame.init()        self.screen=pygame.display.set_mode((self.WIDTH,self.HEIGHT))        pygame.display.set_caption("BALLS!")        self.balls=[]        self.space=pymunk.Space()        self.space.gravity=(0,280)        self.elasticity=0.9        self.segment_1_pos=((0,self.HEIGHT-125),(self.WIDTH,self.HEIGHT-65))        self.segment_1_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.segment_1_shape=pymunk.Segment(self.segment_1_body,self.segment_1_pos[0],self.segment_1_pos[1],10)        self.segment_1_shape.elasticity=self.elasticity        self.space.add(self.segment_1_body,self.segment_1_shape)        self.segment_2_pos=((0,self.HEIGHT-500),(150,self.HEIGHT-400))        self.segment_2_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.segment_2_shape=pymunk.Segment(self.segment_2_body,self.segment_2_pos[0],self.segment_2_pos[1],10)        self.segment_2_shape.elasticity=self.elasticity        self.space.add(self.segment_2_body,self.segment_2_shape)        self.segment_3_pos=((self.WIDTH,self.HEIGHT-500),(self.WIDTH-150,self.HEIGHT-400))        self.segment_3_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.segment_3_shape=pymunk.Segment(self.segment_3_body,self.segment_3_pos[0],self.segment_3_pos[1],10)        self.segment_3_shape.elasticity=self.elasticity        self.space.add(self.segment_3_body,self.segment_3_shape)        self.circle_1_pos=(self.WIDTH/2,self.HEIGHT/2)        self.circle_1_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.circle_1_shape=pymunk.Circle(self.circle_1_body,30,self.circle_1_pos)        self.circle_1_shape.elasticity=self.elasticity        self.space.add(self.circle_1_body,self.circle_1_shape)

写一个自动创建新球的函数 

    def newBall(self,x,y,r):        body=pymunk.Body(1,100,body_type=pymunk.Body.DYNAMIC)        body.position=x,y        shape=pymunk.Circle(body,r)        shape.elasticity=self.elasticity        self.space.add(body,shape)        self.balls.append((shape,r))

事件监听 

    def listen(self):        for event in pygame.event.get():            if event.type==QUIT:                sys.exit()            if event.type==MOUSEBUTTONDOWN:                self.newBall(*pygame.mouse.get_pos(),rd.randint(5,10))

绘制并检测物体跳出边界并删除

    def draw(self):        self.screen.fill((255,255,255))        pygame.draw.line(self.screen,(0,0,0),self.segment_1_pos[0],self.segment_1_pos[1],10)        pygame.draw.line(self.screen,(0,0,0),self.segment_2_pos[0],self.segment_2_pos[1],10)        pygame.draw.line(self.screen,(0,0,0),self.segment_3_pos[0],self.segment_3_pos[1],10)        pygame.draw.circle(self.screen,(0,0,0),self.circle_1_pos,30)        for ball,r in self.balls:            pygame.draw.circle(self.screen,(255,0,0),(ball.body.position.x,ball.body.position.y),r)        c=0        while c<len(self.balls) and len(self.balls):            x,y=self.balls[c][0].body.position            if x<0 or x>self.WIDTH or y>self.HEIGHT:                self.space.remove(self.balls[c][0])                self.balls.pop(c)                c-=1            c+=1

主循环 

    def run(self):        while True:            self.listen()            self.draw()            self.space.step(0.001)            pygame.display.update()

启动

if __name__ == '__main__':    demo=Demo()    demo.run()

最终代码

import pymunkimport pygamefrom pygame.locals import *import sysimport random as rd class Demo:    WIDTH=800    HEIGHT=800    def __init__(self):        pygame.init()        self.screen=pygame.display.set_mode((self.WIDTH,self.HEIGHT))        pygame.display.set_caption("BALLS!")        self.balls=[]        self.space=pymunk.Space()        self.space.gravity=(0,280)        self.elasticity=0.9        self.segment_1_pos=((0,self.HEIGHT-125),(self.WIDTH,self.HEIGHT-65))        self.segment_1_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.segment_1_shape=pymunk.Segment(self.segment_1_body,self.segment_1_pos[0],self.segment_1_pos[1],10)        self.segment_1_shape.elasticity=self.elasticity        self.space.add(self.segment_1_body,self.segment_1_shape)        self.segment_2_pos=((0,self.HEIGHT-500),(150,self.HEIGHT-400))        self.segment_2_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.segment_2_shape=pymunk.Segment(self.segment_2_body,self.segment_2_pos[0],self.segment_2_pos[1],10)        self.segment_2_shape.elasticity=self.elasticity        self.space.add(self.segment_2_body,self.segment_2_shape)        self.segment_3_pos=((self.WIDTH,self.HEIGHT-500),(self.WIDTH-150,self.HEIGHT-400))        self.segment_3_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.segment_3_shape=pymunk.Segment(self.segment_3_body,self.segment_3_pos[0],self.segment_3_pos[1],10)        self.segment_3_shape.elasticity=self.elasticity        self.space.add(self.segment_3_body,self.segment_3_shape)        self.circle_1_pos=(self.WIDTH/2,self.HEIGHT/2)        self.circle_1_body=pymunk.Body(body_type=pymunk.Body.STATIC)        self.circle_1_shape=pymunk.Circle(self.circle_1_body,30,self.circle_1_pos)        self.circle_1_shape.elasticity=self.elasticity        self.space.add(self.circle_1_body,self.circle_1_shape)     def newBall(self,x,y,r):        body=pymunk.Body(1,100,body_type=pymunk.Body.DYNAMIC)        body.position=x,y        shape=pymunk.Circle(body,r)        shape.elasticity=self.elasticity        self.space.add(body,shape)        self.balls.append((shape,r))     def listen(self):        for event in pygame.event.get():            if event.type==QUIT:                sys.exit()            if event.type==MOUSEBUTTONDOWN:                self.newBall(*pygame.mouse.get_pos(),rd.randint(5,10))     def draw(self):        self.screen.fill((255,255,255))        pygame.draw.line(self.screen,(0,0,0),self.segment_1_pos[0],self.segment_1_pos[1],10)        pygame.draw.line(self.screen,(0,0,0),self.segment_2_pos[0],self.segment_2_pos[1],10)        pygame.draw.line(self.screen,(0,0,0),self.segment_3_pos[0],self.segment_3_pos[1],10)        pygame.draw.circle(self.screen,(0,0,0),self.circle_1_pos,30)        for ball,r in self.balls:            pygame.draw.circle(self.screen,(255,0,0),(ball.body.position.x,ball.body.position.y),r)        c=0        while c<len(self.balls) and len(self.balls):            x,y=self.balls[c][0].body.position            if x<0 or x>self.WIDTH or y>self.HEIGHT:                self.space.remove(self.balls[c][0])                self.balls.pop(c)                c-=1            c+=1     def run(self):        while True:            self.listen()            self.draw()            self.space.step(0.001)            pygame.display.update() if __name__ == '__main__':    demo=Demo()    demo.run()

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