java-如何更改精灵随机出现在场景中的位置？

我将这种方法与AndEngine一起使用,以将精灵添加到屏幕上并使其在屏幕上移动.

 private void addFace() {
     Random rand = new Random();

        float x = (int) mCamera.getHeight() - mBallTextureRegion.getHeight();
        float minY = mBallTextureRegion.getHeight();
        float maxY = (int)(mCamera.getWidth() +  mBallTextureRegion.getWidth());
        float rangeY = maxY - minY;
        float y = rand.nextInt((int)rangeY) + minY;

     this.mFaceCount++;
     Log.e("Faces: ", "Face" + this.mFaceCount);

    Sprite face = null;
     Body body = null;


             face = new Sprite(x, y, this.mBallTextureRegion.clone());
             body = PhysicsFactory.createBoxBody(this.mPhysicsWorld, face, BodyType.DynamicBody, FIXTURE_DEF);

      this.mScene.attachChild(face);
     this.mPhysicsWorld.registerPhysicsConnector(new PhysicsConnector(face, body, true, true));
             int minDuration = 2;
            int maxDuration = 4;

            int rangeDuration = maxDuration - minDuration;
            int actualDuration = rand.nextInt(rangeDuration) + minDuration;

            MoveXModifier mod = new MoveXModifier(actualDuration, face.getX(), - face.getWidth());

            face.registerEntityModifier(mod);

}

我想做的是,而不是选择“随机”位置并将子画面添加到场景的左侧,我希望将其添加到“顶部”并掉落.

我基本上想改变方向,
我只是不知道如何.我尝试的一切都不是运气.

有什么想法或建议吗？

解决方法:

虽然我对Andengine不太了解,但我怀疑您想更改以下几行：

float x = (int) mCamera.getHeight() - mBallTextureRegion.getHeight();
float y = rand.nextInt((int)rangeY) + minY;

MoveXModifier mod = new MoveXModifier(actualDuration, face.getX(), - face.getWidth());

翻转x和y语句,但如果希望它显示在屏幕外部,则将y设置为-mBallTextureRegion.getHeight().

对于MoveXModifier,我想有一个对应的MoveYModifier(分别使用face.getY()和-face.getHeight())

标签：andengine,box2d,java,android
来源： https://codeday.me/bug/20191202/2086078.html