在上一篇中。我们实现了游戏的開始界面，接下来要实现游戏的主界面。主界面包括地图、我方飞机、敌机等

        先来实现我方飞机

我方飞机具有哪些属性呢？ 飞机要具有生命值、要有动画效果(尾部喷气),飞机不可以飞出边界。所以要进行边界检測，当飞机生命值为0时。飞机会爆炸。然后被移除。

.h文件

//飞机动画
	Animate* planeFly();

	//边界检測
	void borderCheck(float dt);

	//飞机爆炸
	void blowUp();

	//移除飞机
	void removePlane();

	//获取生命值
	int getAlive();

	//设定生命值
	void loseAlive();

	// 更新生命值
	void updateAlive(int alive);

这个变量在create()函数中初始化，方便其它层调用我方飞机的相关数据

static MyPlane* instancePlane;	//飞机实例

我方飞机的生命值直接在这里显示、更新，不受控制器的控制

private:
	int m_alive;
	Label* aliveItem1;
	Label* aliveItem2;

.cpp文件

/*
************************************************************************
*
*	MyPlane.cpp
*	杜星飞 2015年8月13日
*   描写叙述: 包括飞机的属性、功能等
*
************************************************************************
*/

#include "MyPlane.h"
#include "SimpleAudioEngine.h"

MyPlane::MyPlane() :m_alive(5)
{

}
MyPlane::~MyPlane()
{

}

MyPlane* MyPlane::instancePlane = NULL;

MyPlane* MyPlane::create()
{
	MyPlane* m_plane = NULL;
	do 
	{
		m_plane = new MyPlane();
		CC_BREAK_IF(!m_plane);

		if (m_plane && m_plane->init())
		{
			m_plane->autorelease();
			instancePlane = m_plane;
		}
		else
			CC_SAFE_DELETE(m_plane);
	} while (0);

	return m_plane;
}


//飞机动画
Animate* MyPlane::planeFly()
{
	Vector<SpriteFrame *> vector;
	for (int i = 0; i < 2; i++)
	{
		auto frameName = __String::createWithFormat("chinaFly%d.png", i + 1);
		auto temSpriteFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName(frameName->getCString());
		vector.pushBack(temSpriteFrame);
	}
	//设置不断播放飞机的动画
	auto animation = Animation::createWithSpriteFrames(vector, 0.2f, -1);
	auto animate = Animate::create(animation);

	return animate;
}

bool MyPlane::init()
{
	if(!Layer::init())
		return false;

	Size winSize = Director::getInstance()->getWinSize();

	//加入飞机
	auto m_planeSprite = Sprite::createWithSpriteFrameName("chinaFly1.png");
	m_planeSprite->setPosition(Point(winSize.width / 2, m_planeSprite->getContentSize().height / 2));
	m_planeSprite->setTag(AIRPLANE);
	this->addChild(m_planeSprite);
	m_planeSprite->runAction(this->planeFly());

	// 飞机触摸
	auto listener = EventListenerTouchOneByOne::create();
	listener->setSwallowTouches(true);	//吞噬触摸事件

	//对触摸事件的监听过程直接写在这里
	listener->onTouchBegan = [](Touch* touch, Event *event)
	{
		auto target = static_cast<Sprite*>(event->getCurrentTarget());

		Point locationInNode = target->convertToNodeSpace(touch->getLocation());
		Size s = target->getContentSize();
		Rect rect = Rect(0, 0, s.width, s.height);

		if (rect.containsPoint(locationInNode))
			return true;
		else
			return false;
	};

	listener->onTouchMoved = [](Touch* touch, Event *event)
	{
		auto target = static_cast<Sprite*>(event->getCurrentTarget());
		target->setPosition(target->getPosition() + touch->getDelta());
	};

	listener->onTouchEnded = [](Touch* touch, Event* event)
	{
	};

	//将触摸监听加入到eventDispacher中去  
	_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, m_planeSprite);

	//初始化生命值

	//设置标签 并 获取中文文本
	auto dictionary = Dictionary::createWithContentsOfFile("fonts/AboutMe.xml");

	aliveItem1 = Label::createWithTTF(
		(((__String*)(dictionary->objectForKey("alive"))))->getCString(),
		"fonts/DFPShaoNvW5-GB.ttf",
		25);
	aliveItem1->setPosition(Point(winSize.width/8, winSize.height-aliveItem1->getContentSize().height));
	aliveItem1->setColor(Color3B(255, 0, 0));
	this->addChild(aliveItem1);

	aliveItem2 = Label::createWithTTF(
		"5",
		"fonts/DFPShaoNvW5-GB.ttf",
 25);
	aliveItem2->setPosition(Point(aliveItem1->getPositionX()*2, winSize.height - aliveItem1->getContentSize().height));
	aliveItem2->setColor(Color3B(255, 0, 0));
	this->addChild(aliveItem2);

	// 开启边界检測
	this->schedule(schedule_selector(MyPlane::borderCheck));

	return true;
}


//边界检測
void MyPlane::borderCheck(float dt)
{
	//进行边界推断,不可超出屏幕  
	Point location = this->getChildByTag(AIRPLANE)->getPosition();
	Size winSize = Director::getInstance()->getWinSize();  

	// 返回的就是这个矩形的大小
	Size planeSize = this->getChildByTag(AIRPLANE)->getContentSize();  
	
	if (location.x<planeSize.width / 2)
		location.x = planeSize.width / 2;

	if (location.x>winSize.width - planeSize.width / 2)
		location.x = winSize.width - planeSize.width / 2;

	if (location.y<planeSize.height / 2)
		location.y = planeSize.height / 2;

	if (location.y>winSize.height - planeSize.height / 2)
		location.y = winSize.height - planeSize.height / 2;

	this->getChildByTag(AIRPLANE)->setPosition(location);
}

//飞机爆炸
void MyPlane::blowUp()
{
	this->unscheduleAllSelectors(); // 停止飞机的全部行动

	//载入飞机爆炸动画 音效
	if (CocosDenshion::SimpleAudioEngine::getInstance()->isBackgroundMusicPlaying())
	{
		CocosDenshion::SimpleAudioEngine::getInstance()->playEffect("sound/chinaDown.mp3");
	}
	
	Vector<SpriteFrame*> planeBlowUp;
	for (int i = 0; i < 4; i++)
	{
		auto planeName = __String::createWithFormat("china1_down%d.png", i + 1);
		auto tempBlowUp = SpriteFrameCache::getInstance()->getSpriteFrameByName(
			planeName->getCString());
		planeBlowUp.pushBack(tempBlowUp);
	}

	Animation* animation = Animation::createWithSpriteFrames(planeBlowUp, 0.2f);
	Animate* animate = Animate::create(animation);
	CallFunc* m_removePlane = CallFunc::create(this, callfunc_selector(MyPlane::removePlane));
	Sequence* sequence = Sequence::create(animate, m_removePlane, NULL); 

	// 停止一切的飞机动作
	this->getChildByTag(AIRPLANE)->stopAllActions(); 

	this->getChildByTag(AIRPLANE)->runAction(sequence);
}

//移除飞机
void MyPlane::removePlane()
{
	// 移除飞机精灵 true子节点上的全部执行行为和回调将清理
	this->removeChildByTag(AIRPLANE, true); 
}

//获取生命值
int MyPlane::getAlive()
{
	return m_alive;
}

//设定生命值
void MyPlane::loseAlive()
{
	--m_alive;
	updateAlive(m_alive);
}

// 更新生命值
void MyPlane::updateAlive(int alive)
{
	if (alive >= 0)
	{
		CCString* strAlive = CCString::createWithFormat("%d", alive);
		aliveItem2->setString(strAlive->getCString());
		aliveItem2->setColor(Color3B(rand_0_1() * 255, rand_0_1() * 255, rand_0_1() * 255));
	}
}

更新生命值的函数仅仅用在我方飞机生命值降低是调用。

还有就是对于中文字符的处理

//设置标签 并 获取中文文本
	auto dictionary = Dictionary::createWithContentsOfFile("fonts/AboutMe.xml");

能够在项目中加入一个XML文件

<?xml version="1.0" encoding="UTF-8"?>
<dict>
<key>play</key>
<string>開始游戏</string>
<key>score</key>
<string>得分:</string>
<key>alive</key>
<string>生命:</string>

通过对应的key来显示显示对应的中文。

还有就是，有些字体不支持中文的显示，比方 系统自带的 arial.ttf就不行，而DFPShaoNvW5-GB.ttf能够。