Question

I m developing a simple game by andengine. I have 10 balls which are moving randomly on screen.i m importing the balls as picture in sprites.if they move at the same coordinate , they pass though their own insides.but i want: if they move at the same coodirnates ,they should change their directions.so they cannot pass through their insides.how can i do that?

   private Runnable mStartCircle = new Runnable() {
      public void run() {
        int i = circleNumber++;
        Scene scene = Level1Activity.this.mEngine.getScene();
        float startY = -64.0f;
        float startX = randomNumber.nextFloat()*(CAMERA_WIDTH-70.0f);
        float a= randomNumber.nextFloat()*(CAMERA_WIDTH-70.0f);
        circles[i] = new Sprite(startX, startY, textRegCircle[i]);
        circles[i].registerEntityModifier(
                (IEntityModifier) new SequenceEntityModifier (
                            new MoveModifier(10.0f, circles[i].getX(),  a, 
                                    circles[i].getY(),CAMERA_HEIGHT+64.0f)));
        }
        scene.getLastChild().attachChild(circles[i]);
        if (circleNumber < 10){
            mHandler.postDelayed(mStartCircle,1000);
        }
    }
 };

Answer 1

Each object(ball) requires a bounding box, or in your case a bounding circle, which is equal to the size of your sprite.

当游戏更新和任何球场变化时,你必须测试碰撞。

Circle to circle collision testing is the simplest type to do. if distance between (ball1.pos + ball2.pos) is less than (ball1.radius + ball2.radius) = collision.

然后,你处理碰撞问题,扭转这种局面或计算新的动力或东西。 (你们也需要把物体分开,以便不再相互串通)

Answer 2

Just apply a physical connector between balls:

因此,它会串通一气,背后。

final FixtureDef boxFixtureDef = PhysicsFactory.createFixtureDef(0.1f, 0.5f, 0.5f);
final Body ballBody = PhysicsFactory.createBoxBody(this.mPhysicsWorld, circles[i],BodyType.DynamicBody, boxFixtureDef);
this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(circles[i], ballBody, true, true));
this.mScene.attachChild(circles[i]);

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