Question

我完成了我的第一个项目，但我想要更多功能。我正在从一本名为“ Python速成课程”的书中进行此项目。我希望外星人射出会击中外星人的子弹。但是我似乎找不到找到从外星人身上发射子弹的方法。

我试图在创建外来函数的函数中传递射击子弹，但没有任何效果：（

'''This is the fucntions used to create a fleet of aliens.'''

def get_number_aliens_x(ai_settings, alien_width):
    """Determine the number of aliens that fit in a row."""
    available_space_x = ai_settings.screen_width - 2 * alien_width
    number_aliens_x = int(available_space_x / (2 * alien_width))
    return number_aliens_x


def get_number_rows(ai_settings, ship_height, alien_height):
    """Determine the number of aliens that fit on screen."""
    available_space_y = (ai_settings.screen_height - (3 * alien_height) - ship_height)
    number_rows = int(available_space_y / (2 * alien_height))
    return number_rows


def create_alien(ai_settings, screen, aliens, alien_number, row_number):
    """Create an alien and place it in a row."""
    alien = Alien(ai_settings, screen)
    alien_width = alien.rect.width
    alien.x = alien_width + 2 * alien_width * alien_number
    alien.rect.x = alien.x
    alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
    aliens.add(alien)


def create_fleet(ai_settings, screen, ship, aliens):
    """Create a full fleet of aliens."""
    # Create an alien and find the number of aliens in a row
    alien = Alien(ai_settings, screen)
    number_aliens_x = get_number_aliens_x(ai_settings, alien.rect.width)
    number_rows = get_number_rows(ai_settings, ship.rect.height, alien.rect.height)

    # Create the first row of aliens
    for row_number in range(number_rows):
        for alien_number in range(number_aliens_x):
            create_alien(ai_settings, screen, aliens, alien_number, row_number)

我希望外星人向船发射子弹。

Answer 1

我认为public class DrawView extends View implements View.OnTouchListener { private int x = 0; private int y = 0; Bitmap bitmap; Path circlePath; Paint circlePaint; private final Paint paint = new Paint(); private final Paint eraserPaint = new Paint(); @SuppressLint("ClickableViewAccessibility") public DrawView(Context context, Bitmap bitmapHelper) { super(context); setFocusable(true); setFocusableInTouchMode(true); this.setOnTouchListener(this); this.setBackgroundColor(Color.TRANSPARENT); bp = BitmapFactory.decodeResource(getResources(), R.drawable.hearto); bitmap = Bitmap.createBitmap(bitmapHelper.getWidth(), bitmapHelper.getHeight(), Bitmap.Config.ARGB_8888); bitmapCanvas = new Canvas(); bitmapCanvas.setBitmap(bitmap); bitmapCanvas.drawColor(Color.TRANSPARENT); bitmapCanvas.drawBitmap(bp, 0, 0, null); circlePath = new Path(); circlePaint = new Paint(); circlePaint.setAntiAlias(true); circlePaint.setColor(Color.TRANSPARENT); circlePaint.setStyle(Paint.Style.STROKE); circlePaint.setStrokeJoin(Paint.Join.MITER); circlePaint.setStrokeWidth(4f); eraserPaint.setAlpha(0); eraserPaint.setStrokeJoin(Paint.Join.ROUND); eraserPaint.setStrokeCap(Paint.Cap.ROUND); eraserPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); eraserPaint.setAntiAlias(true); } @Override public void onDraw(Canvas canvas) { canvas.drawBitmap(bitmap, 0, 0, paint); bitmapCanvas.drawCircle(x, y, 30, eraserPaint); canvas.drawPath(circlePath, circlePaint); } public boolean onTouch(View view, MotionEvent event) { x = (int) event.getX(); y = (int) event.getY(); bitmapCanvas.drawCircle(x, y, 30, eraserPaint); circlePath.reset(); circlePath.addCircle(x, y, 30, Path.Direction.CW); int ac = event.getAction(); if (ac == MotionEvent.ACTION_UP) { circlePath.reset(); } invalidate(); return true; } }是aliens。

在这种情况下，您可以使用sprite.Group.sprites方法遍历该组中的所有精灵。

sprite.Group()

有什么方法可以访问子画面组中的元素？

1 个答案: