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- # Import the pygame library and initialise the game engine
- import pygame
- import numpy as np
- pygame.init()
-
- # Initialize Pygame
- size = (800, 800)
- CENTER = np.array(size) / 2
- WHITE = (255, 255, 255)
- DAMPING = 0.99
- screen = pygame.display.set_mode(size)
- pygame.display.set_caption("Patrick")
- running = True
- clock = pygame.time.Clock()
-
-
- class Ball(object):
- def __init__(self, x, y, radius=10, mass=1):
- self.pos = np.array([x, y])
- self.last_pos = np.array([x, y])
- self.velocity = np.array([0, 0])
- self.radius = radius
- self.mass = mass
-
- def render(self, screen):
- x, y = self.pos + CENTER
- pygame.draw.circle(screen, WHITE, [int(x), int(y)], self.radius, 2)
-
- def update(self):
- self.pos[1] += .05
-
- if self.pos[1] > 400:
- self.pos[1] = 400
- self.last_pos[1] = 400
- self.velocity[1] = -.5 * self.velocity[1]
-
- self.pos += self.velocity
-
- self.velocity = self.pos - self.last_pos
- self.velocity *= DAMPING
- self.last_pos = np.array(self.pos)
-
-
- class Spring(object):
- def __init__(self, a, b, length=None, k=0.3):
- self.a = a
- self.b = b
- self.k = k
- self.length = self.compute_length() if length is None else length
- print(self.length)
-
- def render(self, screen):
- x1, y1 = self.a.pos + CENTER
- x2, y2 = self.b.pos + CENTER
- pygame.draw.line(screen, WHITE, [x1, y1], [x2, y2])
-
- def compute_length(self):
- x1, y1 = self.a.pos + CENTER
- x2, y2 = self.b.pos + CENTER
- return np.sqrt((x2 - x1)**2 + (y2 - y1)**2)
-
- def update(self):
- current_length = self.compute_length()
- delta = self.b.pos - self.a.pos
- delta /= current_length
- stretch = (current_length - self.length) / self.length
- self.a.velocity += stretch * delta * self.k
- self.b.velocity -= stretch * delta * self.k
-
-
- if __name__ == '__main__':
- balls = [Ball(0., 0.), Ball(100., 100.)]
- springs = [Spring(balls[0], balls[1], length=100)]
-
- while running:
- for event in pygame.event.get():
- if event.type == pygame.QUIT:
- running = False
-
- screen.fill((0, 0, 0))
-
- # Update physics
- for ball in balls:
- ball.update()
-
- for spring in springs:
- spring.update()
-
- # Draw
- for ball in balls:
- ball.render(screen)
-
- for spring in springs:
- spring.render(screen)
-
- pygame.display.flip()
- clock.tick(60)
-
- pygame.quit()
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