// по нажатию создается пуля и помещается в пул, затем берется из него if (Gdx.input.isKeyJustPressed(Input.Keys.SPACE)) { Bullet item = bulletPool.obtain(); item.init(item.getX(), item.getY(), player.getsGun().getRotation()); activeBullets.add(item); } // обновить пули, если за пределами экрана - вернуть в пул for (Bullet bullet : activeBullets) { bullet.update(dt); if (bullet.outOfScreen) { activeBullets.removeValue(bullet, true); bulletPool.free(bullet); } }

As I understand it, a bullet is brought into the pool with the saved init(item.getX(), item.getY(), player.getsGun().getRotation()); that is, a bullet in a bullet has a specific X, Y coordinate, as well as an immutable Rotation value - each bullet from the pool will fly with the rotation with which it was entered into the pool. And now the question is how to change the rotation values ​​in the pool? I need a bullet from the pool to fly to the point where the tower is turned (and it rotates constantly).

Update: Mm, the fact is that the bullet does not know where to fly. Here is the bullet code without using a pool.

 public class Bullet extends BasicObject { private float lifeTime; private float lifeTimer; private boolean remove; public Bullet(float x, float y, float radians) { this.x = x; this.y = y+50; this.radians = radians; float speed = 350; dx = MathUtils.cos(radians) * speed; dy = MathUtils.sin(radians) * speed; width = height = 2; rectangle = new Rectangle(x, y, width, height); lifeTimer = 0; lifeTime = 2; } public boolean shouldRemove() { return remove; } public void update(float dt) { x += dx * dt; y += dy * dt; rectangle.x = x; rectangle.y = y; lifeTimer += dt; if (lifeTimer > lifeTime) { remove = true; } } public void draw(ShapeRenderer sr) { sr.setColor(1, 1, 1, 1); sr.begin(ShapeRenderer.ShapeType.Filled); sr.circle(x - width / 2, y - height / 2, width / 2); sr.end(); } }

But the Player class:

 public class Player extends BasicObject { private ArrayList<Bullet> bullets; private final int MAX_BULLETS = 20; private Texture tTower; private Texture tGun; private Sprite sTower; private Sprite sGun; private float curAngle; private Rectangle rGun; radians = 3.1415f / 2; public Player(ArrayList<Bullet> bullets) { this.bullets = bullets; x = MyMainClass.WIDTH / 2; y = 0; // tower rectangle = new Rectangle(); rectangle.x = x - 64/2; rectangle.y = y; rectangle.width = 64; rectangle.height = 64; rGun = new Rectangle(); rGun.x = x - 64/2; rGun.y = y + 10; rGun.width = 64; rGun.height = 64; tTower = new Texture("TOWER.png"); sTower = new Sprite(tTower); tGun = new Texture("TOWER_GUN.png"); sGun = new Sprite(tGun); sTower.setPosition(rectangle.x, rectangle.y); sGun.setPosition(rGun.x, rGun.y); sGun.setOrigin(sGun.getWidth() / 2, sGun.getHeight() - sGun.getHeight()); } public void shoot() { if (bullets.size() == MAX_BULLETS) return; bullets.add(new Bullet(x, y, radians)); } public float getX(){return x;} public float getY(){return y;} public void update(float dt) { if (Gdx.input.isTouched()) { // тут код по нахождению угла поворота башни и ограничении ее движения ....... ....... // set rotation radians = (MathUtils.PI / 180 * sGun.getRotation())+ MathUtils.PI/2; } public void draw(SpriteBatch sb) { sb.setColor(1, 1, 1, 1); sb.begin(); sTower.draw(sb); sGun.draw(sb); sb.end(); } }

In PlayState I write if (Gdx.input.isKeyJustPressed(Input.Keys.SPACE)) { player.shoot(); } if (Gdx.input.isKeyJustPressed(Input.Keys.SPACE)) { player.shoot(); } , and as a result the bullet flies where the gun is turned. And everything would be fine, only the bullet is constantly being re-created and then deleted, and there are enough such objects to be created and besides the bullet, I’m trying to make a pool.

  • why not make the method bullet.setRotation(double angle) ? - Nofate ♦
  • @Nofate, added for example the Bullet and Player classes without using a pool - Krem Soda
  • I do not see where you use the pool named with bullets; when you call shoot, bullets are created via bullets.add (new Bullet (x, y, radians)); - Daniel Protopopov
  • A new bullet is not created there, but added to activeBullets (see the very beginning of the question). In any case, I wrote a solution to the problem — I didn’t need to write getRotation (), but to write in more detail - Krem Soda

1 answer 1

So the problem is this: item.init(item.getX(), item.getY(), player.getsGun().getRotation()); - more precisely, in player.getsGun().getRotation()); . I just replaced it (and broke this line into separate parts) with item.setDx(MathUtils.cos(player.getRadians()) * item.getSpeed()); item.setDy(MathUtils.sin(player.getRadians()) * item.getSpeed()); item.setDx(MathUtils.cos(player.getRadians()) * item.getSpeed()); item.setDy(MathUtils.sin(player.getRadians()) * item.getSpeed()); from the class Bullet (in short, manually pointed out dx and dy in the main class), and everything worked fine - now the bullets are flying only where they want