新建一个工程，相信感兴趣的同学都想知道cocos引擎都是如何运行的
想知道是如何运行的，看懂四个文件即可
话不多说，上代码：
1、首先解释 AppDelegate.h
1 #ifndef _APP_DELEGATE_H_
2 #define _APP_DELEGATE_H_
3
4 #include "cocos2d.h"
5
6 /**
7 @brief The cocos2d Application.
8
9 Private inheritance here hides part of interface from Director.
10 */ //从这里可以看到AppDelegate继承了cocos2d::Application ，而cocos2d::Application是cocos2d-x引擎提供的基类
11 class AppDelegate : private cocos2d::Application
12 {
13 public:
14 AppDelegate();
15 virtual ~AppDelegate();
16 /*
17
18 */
19 virtual void initGLContextAttrs();
20
21 /**
22 @brief Implement Director and Scene init code here.
23 @return true Initialize success, app continue.
24 @return false Initialize failed, app terminate.
25 *游戏启动时调用的函数，在这里可以初始化导演对象和场景对象
26 */
27 virtual bool applicationDidFinishLaunching();
28
29 /**
30 @brief Called when the application moves to the background
31 @param the pointer of the application
32 *游戏进入后台时调用的函数
33 */
34 virtual void applicationDidEnterBackground();
35
36 /**
37 @brief Called when the application reenters the foreground
38 @param the pointer of the application
39 *游戏进入前台时调用的函数
40 */
41 virtual void applicationWillEnterForeground();
42 };
43
44 #endif // _APP_DELEGATE_H_
2、AppDelegate.cpp
#include "AppDelegate.h"
#include "HelloWorldScene.h"
USING_NS_CC;//这个是cocos2d－x提供的一个宏，它是用来替换 using namespace cocos2d语句的。
static cocos2d::Size designResolutionSize = cocos2d::Size(480, 320);
static cocos2d::Size smallResolutionSize = cocos2d::Size(480, 320);
static cocos2d::Size mediumResolutionSize = cocos2d::Size(1024, 768);
static cocos2d::Size largeResolutionSize = cocos2d::Size(2048, 1536);
AppDelegate::AppDelegate()
{
}
AppDelegate::~AppDelegate()
{
}
// if you want a different context, modify the value of glContextAttrs
// it will affect all platforms
void AppDelegate::initGLContextAttrs()
{
// set OpenGL context attributes: red,green,blue,alpha,depth,stencil
GLContextAttrs glContextAttrs = {8, 8, 8, 8, 24, 8};
GLView::setGLContextAttrs(glContextAttrs);
}
// if you want to use the package manager to install more packages,
// don‘t modify or remove this function
static int register_all_packages()
{
return 0; //flag for packages manager
}
// 游戏启动时调用的函数
bool AppDelegate::applicationDidFinishLaunching() {
// initialize director
auto director = Director::getInstance();//初始化导演类
auto glview = director->getOpenGLView();
if(!glview) {
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32) || (CC_TARGET_PLATFORM == CC_PLATFORM_MAC) || (CC_TARGET_PLATFORM == CC_PLATFORM_LINUX)
glview = GLViewImpl::createWithRect("NotesDamo", cocos2d::Rect(0, 0, designResolutionSize.width, designResolutionSize.height));
#else
glview = GLViewImpl::create("NotesDamo");
#endif
director->setOpenGLView(glview);//设置导演类的OpenGL视图
}
// turn on display FPS
director->setDisplayStats(true);//设置是否在屏幕上显示帧率信息(一般都是为了测试，实际发布时是不会显示的)
// set FPS. the default value is 1.0/60 if you don‘t call this
director->setAnimationInterval(1.0f / 60);//一秒执行60帧
// Set the design resolution
glview->setDesignResolutionSize(designResolutionSize.width, designResolutionSize.height, ResolutionPolicy::NO_BORDER);
auto frameSize = glview->getFrameSize();
// if the frame‘s height is larger than the height of medium size.
if (frameSize.height > mediumResolutionSize.height)
{
director->setContentScaleFactor(MIN(largeResolutionSize.height/designResolutionSize.height, largeResolutionSize.width/designResolutionSize.width));
}
// if the frame‘s height is larger than the height of small size.
else if (frameSize.height > smallResolutionSize.height)
{
director->setContentScaleFactor(MIN(mediumResolutionSize.height/designResolutionSize.height, mediumResolutionSize.width/designResolutionSize.width));
}
// if the frame‘s height is smaller than the height of medium size.
else
{
director->setContentScaleFactor(MIN(smallResolutionSize.height/designResolutionSize.height, smallResolutionSize.width/designResolutionSize.width));
}
register_all_packages();
// create a scene. it‘s an autorelease object
auto scene = HelloWorld::createScene();//创建导演类对象scene
// run
director->runWithScene(scene);//运行该场景(会使游戏进入该场景)
return true;
}
// This function will be called when the app is inactive. Note, when receiving a phone call it is invoked.
//游戏进入后台时调用的函数
void AppDelegate::applicationDidEnterBackground() {
Director::getInstance()->stopAnimation();//停止场景中的动画
// if you use SimpleAudioEngine, it must be paused
// 停止背景音乐，默认时注释掉的
// SimpleAudioEngine::getInstance()->pauseBackgroundMusic();
}
// this function will be called when the app is active again
// 游戏进入前台时调用的函数
void AppDelegate::applicationWillEnterForeground() {
Director::getInstance()->startAnimation();//开始场景中的动画
// if you use SimpleAudioEngine, it must resume here
// 继续背景音乐的，默认是注释掉的
// SimpleAudioEngine::getInstance()->resumeBackgroundMusic();
}
3、HelloWorldScene.h
1 #ifndef __HELLOWORLD_SCENE_H__
2 #define __HELLOWORLD_SCENE_H__
3
4 #include "cocos2d.h"
5
6
7 /*
8 *在这里我们可以看出，HelloWorld类继承了cocos2d::Layer类；它被称为层(layer)，这些层被放到了场景(scene)中，场景类是：cocos2d::Scene；
9 注意：HelloWorld.h虽然命名为场景，但是它内部定义的HelloWorld类是一个层
10 */
11 //HelloWorld继承了cocos2d::Layer，HelloWorld是一个层，而不是场景。
12 class HelloWorld : public cocos2d::Layer
13 {
14
15 public:
16
17 static cocos2d::Menu* m_pSelectedItem();
18
19 virtual ~HelloWorld(){}
20
21 static cocos2d::Scene* createScene();//声明创建当前的层HelloWorld所在场景的静态函数createScene()；
22
23 virtual bool init();//声明初始化层HelloWorld实例函数。
24
25 // a selector callback
26 void menuCloseCallback(cocos2d::Ref* pSender);//声明菜单回调函数menuCloseCallback，用于触摸菜单事件的回调。
27
28 CREATE_FUNC(HelloWorld);//CREATE_FUNC是cocos2d-x中定义的一个宏(作用是：创建一个静态函数"static create()"，该函数可以用来创建层)；
29
30
31
32 // implement the "static create()" method manually
33
34 };
35
36 #endif // __HELLOWORLD_SCENE_H__
4、HelloWorldScene.cpp
1 #include "HelloWorldScene.h"
2 #include "SimpleAudioEngine.h"
3
4 USING_NS_CC;
5 /*
6 说明：createScene()函数式是在游戏应用启动的时候，在AppDelegate中的bool AppDelegate::applicationDidFinishLaunching()函数中通过 auto scene = HelloWorld::createScene()语句调用的。
7 createScene()中做了三件事情，首先创建了HelloWorld层所在的场景对象，其次创建了HelloWorld层，最后将HelloWorld层添加到场景scene中；
8 */
9 Scene* HelloWorld::createScene()
10 {
11 // ‘scene‘ is an autorelease object
12 auto scene = Scene::create();
13
14 // ‘layer‘ is an autorelease object
15 // 当调用到这句创建层的时候，会调用HelloWorld的实例函数init()，达到初始化HelloWorld层的目的。
16 auto layer = HelloWorld::create();
17
18 // add layer as a child to scene
19 scene->addChild(layer);
20
21 // return the scene
22 return scene;
23 }
24
25 // on "init" you need to initialize your instance
26 bool HelloWorld::init()
27 {
28 //////////////////////////////
29 // 1. super init first
30 // 初始化父类
31 if ( !Layer::init() )
32 {
33 return false;
34 }
35
36 auto visibleSize = Director::getInstance()->getVisibleSize();
37 Vec2 origin = Director::getInstance()->getVisibleOrigin();
38
39 /////////////////////////////
40 // 2. add a menu item with "X" image, which is clicked to quit the program
41 // you may modify it.
42
43 // add a "close" icon to exit the progress. it‘s an autorelease object
44 // 增加一个菜单项，单机的时候退出程序
45 auto closeItem = MenuItemImage::create(
46 "CloseNormal.png",
47 "CloseSelected.png",
48 CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));
49
50 closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/2 ,
51 origin.y + closeItem->getContentSize().height/2));
52
53 // create menu, it‘s an autorelease object
54 auto menu = Menu::create(closeItem, NULL);
55 menu->setPosition(Vec2::ZERO);//自定义菜单对象的位置
56 this->addChild(menu, 1);//把菜单对象添加到当前HelloWorld层上
57
58 /////////////////////////////
59 // 3. add your codes below...
60
61 // add a label shows "Hello World"
62 // create and initialize a label
63
64 //添加label标签标题
65 auto label = Label::createWithTTF("Hello World", "fonts/Marker Felt.ttf", 24);
66
67 // position the label on the center of the screen
68 label->setPosition(Vec2(origin.x + visibleSize.width/2,
69 origin.y + visibleSize.height - label->getContentSize().height));
70
71 // add the label as a child to this layer
72 this->addChild(label, 1);
73
74 // add "HelloWorld" splash screen"
75 //添加精灵，也就是cocos2d-x的logo，定义到屏幕中央
76 auto sprite = Sprite::create("HelloWorld.png");
77
78 // position the sprite on the center of the screen
79 sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
80
81 // add the sprite as a child to this layer
82 this->addChild(sprite, 0);
83
84
85 return true;
86 }
87
88 // 菜单回调函数(返回主界面)
89 void HelloWorld::menuCloseCallback(Ref* pSender)
90 {
91 //Close the cocos2d-x game scene and quit the application
92 Director::getInstance()->end();
93
94 #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)//IOS表示iOS平台
95 exit(0);
96 #endif
97
98 /*To navigate back to native iOS screen(if present) without quitting the application ,do not use Director::getInstance()->end() and exit(0) as given above,instead trigger a custom event created in RootViewController.mm as below*/
99
100 //EventCustom customEndEvent("game_scene_close_event");
101 //_eventDispatcher->dispatchEvent(&customEndEvent);
102
103
104
105
106 // PhysicsShape物理引擎类精灵(也属于精灵)
107
108
109 // 节点
110 //(1)创建节点
111 Node * chilNode = Node::create();
112 //(2)查找子节点
113 Node *node = node ->getChildByTag(123);
114 //(3)增加新的子节点
115 node->addChild(chilNode,0,123);
116 //(4)删除子节点，并停止该节点上的一切动作
117 node->removeChildByTag(123,true);
118 //(5)通过NOde指针删除节点
119 node ->removeChild(node);
120 //(6)删除所有子节点，并停止这些节点上的一切动作
121 node ->removeAllChildrenWithCleanup(true);
122 //(7)从父节点中删除 node 节点，并停止该节点上的一切动作。
123 node->removeFromParentAndCleanup(true);
124 /*Node重要属性*/
125 // setPosition; 坐标
126 // setAnchorPoint(Vce2(0.5,.05)); 锚点
127
128
129
130
131 //坐标
132 // Vec2 touchLocation = touch ->getLocationInView();
133 // Vec2 touchLocation2 = Director::getInstance()->convertToGL(touchLocation);
134
135
136 }
137
138
139 /**
140 cocos2d-x的事件响应机制：即菜单层最先接收到系统事件，则排在后面的是精灵层，最后是背景层，在事件的传递过程中 ，如果有一个层处理了该事件，则排在后面的层将不再接受到该事件。
141 */
时间： 2024-12-26 01:20:48