更改坐标时，Rect消失

Question

我试着解决我失踪的问题。我绘制一个画布的矩形它工作正常，但如果我将坐标从这个矩形更改为底部，它的消失器将从屏幕上消失。

这些代码显示我的矩形：

public class GameView extends View {


    private Paint paint;
    private Rect recco;
    private GameObject ball;
    public GameView(Context context) {
        super(context);
        initGame(context);
    }

    public GameView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initGame(context);
    }

    public GameView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initGame(context);
    }

    public void initGame(Context context){
        paint = new Paint();
        paint.setColor(Color.BLACK);
        paint.setStrokeWidth(3);
        //ball = new GameObject(context);
        recco = new Rect(0,100,200,200); // top left coordinates
        //ball.setSprite(R.drawable.menu_background);
    }

    @Override
    public void onDraw(Canvas canvas){

        canvas.drawRect(recco, paint);
       // ball.render(canvas);
    }
}

现在我将坐标更改为X = 0而Y = 400则会消失

 public void initGame(Context context){
    paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setStrokeWidth(3);
    //ball = new GameObject(context);
    recco = new Rect(0,400,200,200);
    //ball.setSprite(R.drawable.menu_background);
}