├── README.md
└── tutorial.py


/README.md:
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 1 | # PyMunk-Physics-Simulation
 2 | 
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 4 | 
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12 | 
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15 | 


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/tutorial.py:
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  1 | import pygame
  2 | import pymunk
  3 | import pymunk.pygame_util
  4 | import math
  5 | 
  6 | pygame.init()
  7 | 
  8 | WIDTH, HEIGHT = 1000, 800
  9 | window = pygame.display.set_mode((WIDTH, HEIGHT))
 10 | 
 11 | def calculate_distance(p1, p2):
 12 | 	return math.sqrt((p2[1] - p1[1])**2 + (p2[0] - p1[0])**2)
 13 | 
 14 | def calculate_angle(p1, p2):
 15 | 	return math.atan2(p2[1] - p1[1], p2[0] - p1[0])
 16 | 
 17 | def draw(space, window, draw_options, line):
 18 | 	window.fill("white")
 19 | 
 20 | 	if line:
 21 | 		pygame.draw.line(window, "black", line[0], line[1], 3)
 22 | 
 23 | 	space.debug_draw(draw_options)
 24 | 
 25 | 	pygame.display.update()
 26 | 
 27 | def create_boundaries(space, width, height):
 28 | 	rects = [
 29 | 		[(width/2, height - 10), (width, 20)],
 30 | 		[(width/2, 10), (width, 20)],
 31 | 		[(10, height/2), (20, height)],
 32 | 		[(width - 10, height/2), (20, height)]
 33 | 	]
 34 | 
 35 | 	for pos, size in rects:
 36 | 		body = pymunk.Body(body_type=pymunk.Body.STATIC)
 37 | 		body.position = pos
 38 | 		shape = pymunk.Poly.create_box(body, size)
 39 | 		shape.elasticity = 0.4
 40 | 		shape.friction = 0.5
 41 | 		space.add(body, shape)
 42 | 
 43 | def create_structure(space, width, height):
 44 | 	BROWN = (139, 69, 19, 100)
 45 | 	rects = [
 46 | 		[(600, height - 120), (40, 200), BROWN, 100],
 47 | 		[(900, height - 120), (40, 200), BROWN, 100],
 48 | 		[(750, height - 240), (340, 40), BROWN, 150]
 49 | 	]
 50 | 
 51 | 	for pos, size, color, mass in rects:
 52 | 		body = pymunk.Body()
 53 | 		body.position = pos
 54 | 		shape = pymunk.Poly.create_box(body, size, radius=2)
 55 | 		shape.color = color
 56 | 		shape.mass = mass
 57 | 		shape.elasticity = 0.4
 58 | 		shape.friction = 0.4
 59 | 		space.add(body, shape)
 60 | 
 61 | def create_swinging_ball(space):
 62 | 	rotation_center_body = pymunk.Body(body_type=pymunk.Body.STATIC)
 63 | 	rotation_center_body.position = (300, 300)
 64 | 
 65 | 	body = pymunk.Body()
 66 | 	body.position = (300, 300)
 67 | 	line = pymunk.Segment(body, (0, 0), (255, 0), 5)
 68 | 	circle = pymunk.Circle(body, 40, (255, 0))
 69 | 	line.friction = 1
 70 | 	circle.friction = 1
 71 | 	line.mass = 8
 72 | 	circle.mass = 30
 73 | 	circle.elasticity = 0.95
 74 | 	rotation_center_joint = pymunk.PinJoint(body, rotation_center_body, (0, 0), (0, 0))
 75 | 	space.add(circle, line, body, rotation_center_joint)
 76 | 
 77 | 
 78 | def create_ball(space, radius, mass, pos):
 79 | 	body = pymunk.Body(body_type=pymunk.Body.STATIC)
 80 | 	body.position = pos
 81 | 	shape = pymunk.Circle(body, radius)
 82 | 	shape.mass = mass
 83 | 	shape.elasticity = 0.9
 84 | 	shape.friction = 0.4
 85 | 	shape.color = (255, 0, 0, 100)
 86 | 	space.add(body, shape)
 87 | 	return shape
 88 | 
 89 | def run(window, width, height):
 90 | 	run = True
 91 | 	clock = pygame.time.Clock()
 92 | 	fps = 60
 93 | 	dt = 1 / fps
 94 | 
 95 | 	space = pymunk.Space()
 96 | 	space.gravity = (0, 981)
 97 | 
 98 | 	create_boundaries(space, width, height)
 99 | 	create_structure(space, width, height)
100 | 	create_swinging_ball(space)
101 | 
102 | 	draw_options = pymunk.pygame_util.DrawOptions(window)
103 | 
104 | 	pressed_pos = None
105 | 	ball = None
106 | 
107 | 	while run:
108 | 		line = None
109 | 		if ball and pressed_pos:
110 | 			line = [pressed_pos, pygame.mouse.get_pos()]
111 | 
112 | 		for event in pygame.event.get():
113 | 			if event.type == pygame.QUIT:
114 | 				run = False
115 | 				break
116 | 
117 | 			if event.type == pygame.MOUSEBUTTONDOWN:
118 | 				if not ball:
119 | 					pressed_pos = pygame.mouse.get_pos()
120 | 					ball = create_ball(space, 30, 10, pressed_pos)
121 | 				elif pressed_pos:
122 | 					ball.body.body_type = pymunk.Body.DYNAMIC
123 | 					angle = calculate_angle(*line)
124 | 					force = calculate_distance(*line) * 50
125 | 					fx = math.cos(angle) * force
126 | 					fy = math.sin(angle) * force
127 | 					ball.body.apply_impulse_at_local_point((fx, fy), (0, 0))
128 | 					pressed_pos = None
129 | 				else:
130 | 					space.remove(ball, ball.body)
131 | 					ball = None
132 | 
133 | 		draw(space, window, draw_options, line)
134 | 		space.step(dt)
135 | 		clock.tick(fps)
136 | 
137 | 	pygame.quit()
138 | 
139 | if __name__ == "__main__":
140 | 	run(window, WIDTH, HEIGHT)


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