def main_loop(self):
planet = Planet(100,1,0)
pygame.init()
screen = pygame.display.set_mode((planet.max_row,planet.row_count),
HWSURFACE)
pygame.display.set_caption('Planet')
background = pygame.Surface(screen.get_size())
background.fill((128,128,128))
def in_bounds(x,y):
return (x > planet.row_offsets[y] and
x < planet.row_offsets[y] + planet.row_lengths[y])
background.lock()
for y in range(0, screen.get_height()):
for x in range(0, screen.get_width()):
if in_bounds(x,y):
value = planet.rows[y][x - planet.row_offsets[y]]
background.set_at((x,y),(value,value,value))
background.unlock()
screen.blit(background, (0,0))
points = pygame.sprite.Group()
for n in range(10):
point = pygame.sprite.Sprite()
point.image = pygame.Surface((10,10))
pygame.draw.circle(point.image, (255,0,0), (5,5), 5)
row = random.randint(1, planet.row_count-1)
column = random.randint(0, planet.row_lengths[row]-1)
point.raw_coords = planet.get_coordinates(row, column,
point.image.get_size())
point.theta = random.uniform(0, 2 * math.pi)
point.speed = 0
point.rect = pygame.Rect(point.raw_coords, point.image.get_size())
points.add(point)
midpoints = pygame.sprite.Group()
midpoint = pygame.sprite.Sprite()
midpoint.image = pygame.Surface((10,10))
pygame.draw.circle(midpoint.image, (0,255,0), (5,5), 5)
midpoint.rect = pygame.Rect((0,0), midpoint.image.get_size())
midpoints.add(midpoint)
limit = pygame.time.Clock()
done = False
while not done:
for event in pygame.event.get():
if event.type == QUIT:
done = True
elif event.type == KEYDOWN:
if event.key == K_ESCAPE:
done = True
midpoint.rect.topleft = planet.weighted_average(
[s.raw_coords for s in points.sprites()],
[1 for s in points.sprites()],
[s.image.get_size() for s in points.sprites()],
midpoint.image.get_size())
for point in points:
x, y = point.raw_coords
mp_theta = planet.xy_bearing(midpoint.rect.left,
midpoint.rect.top,
midpoint.image.get_size(),
x, y, point.image.get_size())
if point.speed == 0:
point.speed = 0.001
point.theta = mp_theta
else:
d = planet.distance(midpoint.rect.left,
midpoint.rect.top,
midpoint.image.get_size(),
x, y, point.image.get_size())
xs = (point.speed * math.cos(point.theta) +
0.001 * math.cos(d/2) * math.cos(mp_theta))
ys = (point.speed * math.sin(point.theta) +
0.001 * math.cos(d/2) * math.sin(mp_theta))
point.speed = min(1, math.sqrt(xs*xs + ys*ys))
point.theta = math.atan2(ys, xs)
theta, x2, y2 = planet.apply_bearing(point.speed, point.theta,
x, y,
point.image.get_size())
point.theta = theta
point.raw_coords = x2,y2
point.rect.topleft = point.raw_coords
points.clear(screen, background)
points.draw(screen)
midpoints.clear(screen, background)
midpoints.draw(screen)
pygame.display.flip()
limit.tick()
