void HelloWorld::ccTouchMoved(cocos2d::CCTouch *touch, cocos2d::CCEvent *event)

{

	CCSize winSize = CCDirector::sharedDirector()->getVisibleSize();

	if (m_ship) {

		CCPoint pos = touch->getDelta();//获取触点当前位置与较早前的位置的差距

		CCPoint currentPos = m_ship->getPosition();//精灵坐标

		currentPos = ccpAdd(currentPos, pos);//精灵加触摸坐标

		currentPos = ccpClamp(currentPos, CCPointZero, ccp(winSize.width, winSize.height));//限制精灵出屏幕

		m_ship->setPosition(currentPos);//重设精灵坐标

	}

}