使用Canvas和TimerTask在不同方向上圈出动画

Question

如何使圆以不同的方向旋转？我必须制作一个太阳系动画。中心是太阳，行星围绕太阳以不同的方向和速度旋转。问题是所有圆都沿顺时针方向旋转，蓝色和灰色圆圈的rotate（）方法中的度为负...预先感谢

    public class MainActivity extends AppCompatActivity {
ImageView imageView;
Timer timer;
Canvas canvas;
Paint paint, paint1, paint2, paint3, paint4;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);



    Bitmap bitmap = Bitmap.createBitmap(1000, 1500, Bitmap.Config.ARGB_8888);
    bitmap.eraseColor(Color.parseColor("#EBEBEB"));
    canvas = new Canvas();
    canvas.setBitmap(bitmap);

    paint = new Paint();
    paint1 = new Paint();
    paint2 = new Paint();
    paint3 = new Paint();
    paint4 = new Paint();

    paint.setColor(Color.YELLOW);
    paint1.setColor(Color.RED);
    paint2.setColor(Color.BLUE);
    paint3.setColor(Color.GREEN);
    paint4.setColor(Color.GRAY);


    canvas.drawCircle(500f, 750f, 130, paint);
    canvas.drawCircle(400f, 560f, 51, paint1);
    canvas.drawCircle(750f, 920f, 48, paint2);
    canvas.drawCircle(300f, 1100f, 45, paint3);
    canvas.drawCircle(320f, 300f, 42, paint4);


    imageView = findViewById(R.id.imageView);
    imageView.setImageBitmap(bitmap);

    timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            runOnUiThread(
                    new Runnable() {
                        @Override
                        public void run() {
                            animationFrame();

                        }
                    }
            );
        }
    }, 3000, 80);


}

private void animationFrame() {

    canvas.drawColor(Color.parseColor("#EBEBEB"));

    paint.setColor(Color.YELLOW);
    canvas.drawCircle(500f, 750f, 130f, paint);


    if (paint1 != null | paint3 != null) {
        paint1.setColor(Color.RED);
        canvas.drawCircle(400f, 560f, 51f, paint1);
        canvas.rotate(10f, 500f, 750f);

        paint3.setColor(Color.GREEN);
        canvas.drawCircle(350f, 1050f, 45, paint3);
        canvas.rotate(30f, 500f, 750f);
    }
    if (paint2 != null | paint4 != null) {
        paint2.setColor(Color.BLUE);
        canvas.drawCircle(720f, 950f, 48, paint2);
        canvas.rotate(-10f, 500f, 750f);

        paint4.setColor(Color.GRAY);
        canvas.drawCircle(290f, 330f, 42, paint4);
        canvas.rotate(-25f, 500f, 750f);
    }


    imageView.invalidate();
}