Dojo Defender Sessie 5: Cheatsheet

stars = []

def init_stars():
    global stars
    stars = []
    layers = [
        (40, 0.3, 2, 120),
        (40, 0.7, 3, 180),
        (30, 1.5, 4, 255),
    ]
    for count, speed, size, brightness in layers:
        for _ in range(count):
            stars.append({
                'x': random.randint(0, WIDTH),
                'y': random.randint(0, HEIGHT),
                'speed': speed,
                'size': size,
                'brightness': brightness,
            })

def update_stars():
    for star in stars:
        star['y'] += star['speed']
        if star['y'] > HEIGHT + star['size']:
            star['y'] = -star['size']
            star['x'] = random.randint(0, WIDTH)

def draw_stars(surface):
    for star in stars:
        c = (star['brightness'], star['brightness'], star['brightness'])
        if star['size'] <= 2:
            pygame.draw.rect(surface, c, (star['x'], star['y'], star['size'], star['size']))
        else:
            pygame.draw.circle(surface, c, (int(star['x']), int(star['y'])), star['size'] // 2)

particles = []

def spawn_particles(x, y, count, colors, speed_range, size_range, life_range):
    for _ in range(count):
        angle = random.uniform(0, 2 * math.pi)
        speed = random.uniform(speed_range[0], speed_range[1])
        particles.append({
            'x': x, 'y': y,
            'vx': math.cos(angle) * speed,
            'vy': math.sin(angle) * speed,
            'life': random.randint(life_range[0], life_range[1]),
            'max_life': life_range[1],
            'color': random.choice(colors),
            'size': random.uniform(size_range[0], size_range[1]),
        })

def update_particles():
    for p in particles[:]:
        p['x'] += p['vx']
        p['y'] += p['vy']
        p['life'] -= 1
        if p['life'] <= 0:
            particles.remove(p)

def draw_particles(surface):
    for p in particles:
        ratio = p['life'] / p['max_life']
        color = tuple(int(c * ratio) for c in p['color'])
        pygame.draw.circle(surface, color, (int(p['x']), int(p['y'])), int(p['size'] * ratio))

if moving and ship.visible:
    spawn_particles(
        ship.rect.centerx, ship.rect.bottom,
        1, [(255, 100, 0), (255, 60, 0)],
        (0.5, 1.5), (2, 4), (10, 20),
    )

spawn_particles(
    enemy.rect.centerx, enemy.rect.centery,
    random.randint(8, 12),
    [(255, 140, 0), (255, 0, 0), (255, 255, 0), (255, 255, 255)],
    (1, 4), (2, 5), (20, 40),
)

def spawn_asteroid(size='big'):
    rock = GameObject(f'asteroid_{size}.png', random.randint(30, WIDTH - 30), -30)
    rock.speed = random.uniform(3, 5)
    rock.asteroid_size = size
    asteroids.append(rock)
    return rock

def split_asteroid(rock):
    spawn_particles(
        rock.rect.centerx, rock.rect.centery,
        random.randint(8, 12),
        [(255, 140, 0), (255, 0, 0), (255, 255, 0), (255, 255, 255)],
        (1, 4), (2, 5), (20, 40),
    )
    if rock.asteroid_size == 'big':
        for _ in range(2):
            r = spawn_asteroid('med')
            r.rect.center = rock.rect.center
            r.rect.x += random.randint(-20, 20)
            r.speed = random.uniform(2, 4)
    elif rock.asteroid_size == 'med':
        for _ in range(2):
            r = spawn_asteroid('small')
            r.rect.center = rock.rect.center
            r.rect.x += random.randint(-15, 15)
            r.speed = random.uniform(1, 3)
    asteroids.remove(rock)