Cocos2d-x学习笔记二_第一个小游戏

这个游戏代码很少，用来了解下Cocos2d-x大致的工作流程

开发环境为win7 64位+VS2013+Cocos2d-x3.4,创建项目过程省略。

参考资料http://cn.cocos2d-x.org/tutorial/show?id=2529

这个游戏只需要更改创建好的项目中两个文件，分别是HelloWorldScene.h和HelloWorldScene.cpp,所需的图片和声音资源在这里下载Resources连个文件在这里下载代码

HelloWorldScene.h的代码和注释如下

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
#include "SimpleAudioEngine.h"//支持简单声音文件
USING_NS_CC;

class HelloWorld : public cocos2d::Layer
{
	
public:
    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::Scene* createScene();
    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();//初始化函数
    void addMonster(float dt);//添加一个怪兽
    // a selector callback
    void menuCloseCallback(cocos2d::Ref* pSender);
    virtual bool onTouchBegan(Touch* pTouch, Event* pEvent);//在触摸事件开始时调用
    virtual void onTouchMoved(Touch* pTouch, Event* pEvent);//在滑动事件发生时调用
    virtual void onTouchEnded(Touch* pTouch, Event* pEvent);//在触摸事件结束时调用
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
    bool onContactBegin(const PhysicsContact& contact);//检测到发生物理碰撞时调用
private:
	std::vector Monster;//声明一个精灵类表示怪兽
	std::vector projectile;//声明一个精灵类表示飞镖
	EventListenerTouchOneByOne* touch_listener;//声明一个时间监听器坚挺触碰事件
	Sprite* _player;//声明一个精灵类表示玩家
	int i, j;定义两个变量
};

#endif // __HELLOWORLD_SCENE_H__

HelloWorldScene.cpp代码和注释如下

#include "HelloWorldScene.h"

USING_NS_CC;

Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
	//1
	auto scene = Scene::createWithPhysics();//创建一个物理世界
	//2
	scene->getPhysicsWorld()->setGravity(Vect(0, 0));//设置重力参数，这里表示水平和垂直方向都没有重力加速度
	//3
	scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_NONE);//调试参数，DEBUGDRAW_NONE表示关闭调试
    // 'layer' is an autorelease object
    auto layer = HelloWorld::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
	i = 0;
	j = 0;
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

    /////////////////////////////
    // 2. add a menu item with "X" image, which is clicked to quit the program
    //    you may modify it.

    // add a "close" icon to exit the progress. it's an autorelease object
    auto closeItem = MenuItemImage::create(
                                           "CloseNormal.png",
                                           "CloseSelected.png",
                                           CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));
    
	closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/2 ,
                                origin.y + closeItem->getContentSize().height/2));

    // create menu, it's an autorelease object
    auto menu = Menu::create(closeItem, NULL);
    menu->setPosition(Vec2::ZERO);
    this->addChild(menu, 1);

    /////////////////////////////
    // 3. add your codes below...
	CocosDenshion::SimpleAudioEngine::sharedEngine()->playBackgroundMusic("mt.mp3", true);//添加背景音乐，现在的问题是，点击鼠标后就会停止
	touch_listener = EventListenerTouchOneByOne::create();
	touch_listener->setSwallowTouches(false);//不向下触摸，简单点来说，比如有两个sprite，A和B，A在上，B在下（未知重叠），触摸A的时候，B不受影响
	touch_listener->onTouchBegan = CC_CALLBACK_2(HelloWorld::onTouchBegan, this);//调用触摸时间处理函数
	touch_listener->onTouchMoved = CC_CALLBACK_2(HelloWorld::onTouchMoved, this);
	touch_listener->onTouchEnded = CC_CALLBACK_2(HelloWorld::onTouchEnded, this);
	touch_listener->onTouchCancelled = CC_CALLBACK_2(HelloWorld::onTouchCancelled, this);
	_eventDispatcher->addEventListenerWithSceneGraphPriority(touch_listener, this);//与事件监听器绑定
    // add a label shows "Hello World"
    // create and initialize a label
    
    auto label = Label::createWithTTF("Hello World", "fonts/Marker Felt.ttf", 24);
    
    // position the label on the center of the screen
    label->setPosition(Vec2(origin.x + visibleSize.width/2,
                            origin.y + visibleSize.height - label->getContentSize().height));

    // add the label as a child to this layer
    this->addChild(label, 1);

    // add "HelloWorld" splash screen"
    auto sprite = Sprite::create("HelloWorld.png");

    // position the sprite on the center of the screen
    sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));

    // add the sprite as a child to this layer
    this->addChild(sprite, 0);
	LayerColor* _layer = LayerColor::create(Color4B(255, 255, 255, 255), visibleSize.width, visibleSize.height);//设置背景颜色
	this->addChild(_layer);
	_player = Sprite::create("player_hd.png");//添加精灵
	_player->setPosition(visibleSize.width/8, visibleSize.height/2);//设置精灵的位置
	this->addChild(_player);
	this->schedule(schedule_selector(HelloWorld::addMonster), 1);
	EventListenerPhysicsContact *contact_listener = EventListenerPhysicsContact::create();//创建物理碰撞检测监听器
	contact_listener->onContactBegin = CC_CALLBACK_1(HelloWorld::onContactBegin, this);
	_eventDispatcher->addEventListenerWithSceneGraphPriority(contact_listener, this);//绑定物理碰撞检测监听器
    return true;
}


void HelloWorld::menuCloseCallback(Ref* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
	MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
    return;
#endif

    Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}
void HelloWorld::addMonster(float dt)
{
	Size visibleSize = Director::getInstance()->getVisibleSize();
	Sprite* MonsterExample = Sprite::create("monster_hd.png");
	i = i + 1;
	auto OneBody = PhysicsBody::createBox(MonsterExample->getContentSize());//创建物理刚体
	//MonsterExample = Sprite::create("monster_hd.png");
	OneBody->setContactTestBitmask(0x08);//设置碰撞检测参数，不为0即开启碰撞检测
	MonsterExample->setPhysicsBody(OneBody);//绑定刚体与精灵
	MonsterExample->setPosition(
	visibleSize.width + MonsterExample->getContentSize().width,
	MonsterExample->getContentSize().height / 2 + CCRANDOM_0_1()*(visibleSize.height - MonsterExample->getContentSize().height / 2));//设置精灵出现的位置
	
	Monster.push_back(MonsterExample);
	this->addChild(Monster.back(), i);
	MoveTo* Move = MoveTo::create(3, Vec2(-Monster.back()->getContentSize().width / 2, Monster.back()->getPosition().y));//设置精灵的移动方向与速度
	Monster.back()->runAction(Move);
}
bool HelloWorld::onTouchBegan(Touch* pTouch, Event*pEvent)
{
	Size visibleSize = Director::getInstance()->getVisibleSize();
	Point touchLocation = pTouch->getLocationInView();
	touchLocation = Director::getInstance()->convertToGL(touchLocation);
	Sprite* projectileExmaple = Sprite::create("projectile_hd.png");
	CocosDenshion::SimpleAudioEngine::sharedEngine()->playBackgroundMusic("smzy.mp3", true);
	j += 1;
	auto OneBody = PhysicsBody::createBox(projectileExmaple->getContentSize());
	OneBody->setContactTestBitmask(0x04);
	projectileExmaple->setPhysicsBody(OneBody);
	projectileExmaple->setPosition(visibleSize.width / 8, visibleSize.height / 2);
	projectile.push_back(projectileExmaple);
	this->addChild(projectile.back(), j);
	Point offset = ccpSub(touchLocation, _player->getPosition());
	float ratio = offset.y / offset.x;
	int targetX = _player->getContentSize().width / 2 + visibleSize.width;
	int targetY = (targetX*ratio) + _player->getPosition().y;
	Vec2 targetPosition = Vec2(targetX, targetY);
	MoveTo* Move = MoveTo::create(2, targetPosition);
	projectile.back()->runAction(Move);
	return true;
}
void HelloWorld::onTouchMoved(Touch* pTouch, Event* pEvent)
{
}
void HelloWorld::onTouchEnded(Touch* pTouch, Event* pEvent)
{
}
bool HelloWorld::onContactBegin(const PhysicsContact& contact)//首先获得两个碰撞的刚体的对象，然后从界面中移除
{
	PhysicsBody* a = contact.getShapeA()->getBody();
	PhysicsBody* b = contact.getShapeB()->getBody();
	this->removeChild(a->getNode());
	this->removeChild(b->getNode());
	return true;
}