如何在JavaScript突破游戏中检测球与桨和砖之间的碰撞？

Question

我正在创建一个Javascript突破游戏，但是在检测球与桨和砖之间的碰撞时遇到问题。

在运行程序时，桨叶在窗口壁之间的边界处工作良好。当我尝试执行代码以检测与桨和砖块的碰撞时，整个程序保持不变。

我已经尝试了几种if / else变体来修复它，但无法弄清楚为什么代码不起作用。 JavaScript代码如下：

function createBall(gw) {
  let centerX = gw.getWidth() / 2;
  let centerY = gw.getHeight() / 2;
  let x0 = centerX - (BALL_SIZE / 2);
  let y0 = centerY - (BALL_SIZE / 2);
  let ball = GOval(x0, y0, BALL_SIZE, BALL_SIZE);
  ball.setFilled(true);
  gw.add(ball);


  let checkForCollision = function(paddle, brick) {
    let collider = getCollidingObject(gw, ball);
    if (collider === paddle) {
      vy = -vy;
      ball.move(vx, vy);
    } if (collider === brick) {
      vy = -vy;
      ball.move(vx, vy);
      gw.remove(brick);
    }
  }

  let clickAction = function(e) {
    let vy = INITIAL_Y_VELOCITY;
    let vx = randomReal(MIN_X_VELOCITY, MAX_X_VELOCITY);
    if (randomChance()) vx = -vx;

    let step = function() {

      if (ball.getX() > 0 && ball.getY() > 0 &&
          ball.getX() < gw.getWidth() - BALL_SIZE &&
          ball.getY() < gw.getHeight() - BALL_SIZE) {
        ball.move(vx, vy);
        checkForCollision(brick, paddle);
      }

      if (ball.getX() < 0 || ball.getX() > gw.getWidth() - BALL_SIZE) {
        vx = -vx;
        ball.move(vx, vy);
      }
      if (ball.getY() < 0) {
        vy = -vy;
        ball.move(vx, vy);
      }
      else if (ball.getY() > gw.getHeight()) {
        clearInterval(timer);
      }
    };
    let timer = setInterval(step, TIME_STEP);
  };
  gw.addEventListener("click", clickAction);
}


function getCollidingObject(gw, ball) {
  let x = ball.getX();
  let y = ball.getY();
  let object = null;

  object = gw.getElementAt(x, y);
  if (object !== NULL) {
    return object;
  }
  object = gw.getElementAt(x, y + BALL_SIZE);
  if (object !== NULL) {
    return object;
  }
  object = gw.getElementAt(x + BALL_SIZE, y);
  if (object !== NULL) {
    return object;
  }
  object = gw.getElementAt(x + BALL_SIZE, y + BALL_SIZE);
  if (object !== NULL) {
    return object;
  }
  return NULL;
}

我对以前的代码做了一些小的编辑，但无济于事。请帮帮我。谢谢！