The _player object is created through a static method that uses our blank.png file to texture the sprite. That method also makes a call to initPlayer, and this is what you should type for that method:

void Player::initPlayer () {
    this->setAnchorPoint(Vec2(0.5f, 1.0f));
    this->setPosition(Vec2(_screenSize.width * 0.2f, _nextPosition.y));
    
    _height = 228;
    _width = 180;
    this->setTextureRect(Rect(0, 0, _width, _height));
    this->setColor(Color3B(255,255,255));
}

The _player object will have its registration point at the top of the sprite. The reason behind this top center anchor point has much more to do with the way the _player object will be animated when floating, than with any collision logic requirements.

Next comes setFloating:

void Player::setFloating (bool value) {
    
    if (_floating == value) return;
    
    if (value && _hasFloated) return;
    
    _floating = value;
    ...