android - Andengine，让 Sprite 随机 move

Question

我想在点击它时使 Sprite move ，但我有一个问题...... Sprite 总是 move 到左上角，我试图输入随机值，但它没有给出结果

ballITexture = TextureRegionFactory.extractFromTexture(BaseActivity.getSharedInstance().ballTexture);
final Random rand = new Random();
sprite = new Sprite(0, 0, ballITexture, BaseActivity.getSharedInstance().getVertexBufferObjectManager()){
            @Override
            public boolean onAreaTouched(TouchEvent pSceneTouchEvent, float pTouchAreaLocalX, float pTouchAreaLocalY) {
               randomMove(rand.nextInt(4), pTouchAreaLocalX, pTouchAreaLocalY, this);

            };

mCamera = BaseActivity.getSharedInstance().mCamera;
sprite.setPosition(mCamera.getWidth() / 2 - sprite.getWidth() / 2, mCamera.getHeight() / 2 - sprite.getHeight() / 2);
moveable = true;

这是 randomMove 方法:

private void randomMove(int direction, float pTouchAreaLocalX, float pTouchAreaLocalY, Sprite sprite){

    switch(direction){
            case 0:
                sprite.registerEntityModifier(new MoveModifier(1, pTouchAreaLocalX, 1, pTouchAreaLocalY, 1));
                break;
            case 1:
                sprite.registerEntityModifier(new MoveModifier(1, pTouchAreaLocalX, 1, pTouchAreaLocalY, -1));
                break;
            case 2:
                sprite.registerEntityModifier(new MoveModifier(1, pTouchAreaLocalX, -1, pTouchAreaLocalY, 1));
                break;
            case 3:
                sprite.registerEntityModifier(new MoveModifier(1, pTouchAreaLocalX, -1, pTouchAreaLocalY, -1));
                break;
        }

}

我的问题是，为什么我的 Sprite 在我触摸它时总是 move 到左上角，而不是随机 move ？如何解决？

Answer 1

算了，我给 MoveModifier 传递了不正确的参数，我把 1 和 -1 值应该是相机的任何像素

private void randomMove(int direction, float pTouchAreaLocalX, float pTouchAreaLocalY, Sprite sprite){

        sprite.registerEntityModifier(new MoveModifier(1, pTouchAreaLocalX, rand.nextInt(mCamera.getWidth()), pTouchAreaLocalY, rand.nextInt(mCamera.getHeight())));