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demo.py
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demo.py
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import pymunk
from pymunk.pygame_util import *
from pymunk.vec2d import Vec2d
import pygame
from pygame.locals import *
import math
import random
from PIL import Image
space = pymunk.Space()
b0 = space.static_body
size = w, h = 700, 300
GRAY = (220, 220, 220)
RED = (255, 0, 0)
BLUE = (0, 0, 255)
class Segment:
def __init__(self, p0, v, radius=10):
self.body = pymunk.Body()
self.body.position = p0
shape = pymunk.Segment(self.body, (0, 0), v, radius)
shape.density = 0.1
shape.elasticity = 0.5
shape.filter = pymunk.ShapeFilter(group=1)
shape.color = (0, 255, 0, 0)
space.add(self.body, shape)
class Circle:
def __init__(self, pos, radius=20):
self.body = pymunk.Body()
self.body.position = pos
shape = pymunk.Circle(self.body, radius)
shape.density = 0.01
shape.friction = 0.9
shape.elasticity = 1
space.add(self.body, shape)
class Box:
def __init__(self, p0=(0, 0), p1=(w, h), d=4):
x0, y0 = p0
x1, y1 = p1
ps = [(x0, y0), (x1, y0), (x1, y1), (x0, y1)]
for i in range(4):
segment = pymunk.Segment(b0, ps[i], ps[(i+1) % 4], d)
segment.elasticity = 1
segment.friction = 1
space.add(segment)
class App:
def __init__(self):
pygame.init()
self.screen = pygame.display.set_mode(size)
self.draw_options = DrawOptions(self.screen)
self.active_shape = None
self.selected_shapes = []
self.pulling = False
self.running = True
self.gravity = False
self.images = []
self.image_nbr = 60
def run(self):
while self.running:
for event in pygame.event.get():
self.do_event(event)
self.draw()
space.step(0.01)
pygame.quit()
def do_event(self, event):
if event.type == QUIT:
self.running = False
elif event.type == KEYDOWN:
if event.key in (K_q, K_ESCAPE):
self.running = False
elif event.key == K_p:
pygame.image.save(self.screen, 'mouse.png')
keys = {K_LEFT: (-1, 0), K_RIGHT: (1, 0),
K_UP: (0, 1), K_DOWN: (0, -1)}
if event.key in keys:
v = Vec2d(keys[event.key]) * 20
if self.active_shape != None:
self.active_shape.body.position += v
elif event.key == K_c:
p = from_pygame(pygame.mouse.get_pos(), self.screen)
Circle(p, radius=20)
elif event.key == K_BACKSPACE:
s = self.active_shape
if s != None:
space.remove(s, s.body)
self.active_shape = None
elif event.key == K_h:
self.gravity = not self.gravity
if self.gravity:
space.gravity = 0, -900
else:
space.gravity = 0, 0
elif event.key == K_g:
self.image_nbr = 60
elif event.type == MOUSEBUTTONDOWN:
p = from_pygame(event.pos, self.screen)
self.active_shape = None
for s in space.shapes:
dist, info = s.point_query(p)
if dist < 0:
self.active_shape = s
self.pulling = True
s.body.angle = (p - s.body.position).angle
if pygame.key.get_mods() & KMOD_META:
self.selected_shapes.append(s)
print(self.selected_shapes)
else:
self.selected_shapes = []
elif event.type == MOUSEMOTION:
self.p = event.pos
elif event.type == MOUSEBUTTONUP:
if self.pulling:
self.pulling = False
b = self.active_shape.body
p0 = Vec2d(b.position)
p1 = from_pygame(event.pos, self.screen)
impulse = 100 * Vec2d(p0 - p1).rotated(-b.angle)
b.apply_impulse_at_local_point(impulse)
def draw(self):
self.screen.fill(GRAY)
space.debug_draw(self.draw_options)
if self.active_shape != None:
s = self.active_shape
r = int(s.radius)
p = to_pygame(s.body.position, self.screen)
pygame.draw.circle(self.screen, RED, p, r, 3)
if self.pulling:
pygame.draw.line(self.screen, RED, p, self.p, 3)
pygame.draw.circle(self.screen, RED, self.p, r, 3)
for s in self.selected_shapes:
self.draw_bb(s)
if self.image_nbr > 0:
strFormat = 'RGBA'
raw_str = pygame.image.tostring(self.screen, strFormat, False)
image = Image.frombytes(strFormat, self.screen.get_size(), raw_str)
self.images.append(image)
self.image_nbr -= 1
if self.image_nbr == 0:
self.images[0].save('pillow.gif',
save_all=True, append_images=self.images[1:], optimize=False, duration=40, loop=0)
self.images = []
pygame.display.update()
def draw_bb(self, shape):
pos = shape.bb.left, shape.bb.top
w = shape.bb.right - shape.bb.left
h = shape.bb.top - shape.bb.bottom
p = to_pygame(pos, self.screen)
pygame.draw.rect(self.screen, BLUE, (*p, w, h), 1)
if __name__ == '__main__':
Box()
space.gravity = 0, -900
r = 25
for i in range(9):
x = random.randint(r, w-r)
y = random.randint(r, h-r)
Circle((x, y), r)
App().run()