- C++语言基础
- 创建物理世界
- 添加边框
在游戏世界中，任务跳起来后会掉下来，这个涉及到世界的重力加速度，不过我们首先要说一下C++语言的基础！
1.C++作为面向对象语言编程，由头文件.h和源文件.cpp组成，其中头文件负责对象的声明，方法的声明，源文件负责对象的具体实现！
如果要使用类里面的对象，使用.字符，则Class.object
如果要使用类里面的方法，使用->字符，Director::getInstance()->getVisibleSize()
而::是类作用域运算符，看定义
<pre>#pragma once
include <cocos2d.h>
include <iostream>
USING_NS_CC;
class EdgeBox :public Node//创建EdgeBox继承自Node
{
public:
virtual bool init();//声明初始化函数
CREATE_FUNC(EdgeBox);//创建类
private://定义私有变量
};
</pre><pre>#include "EdgeBox.h"
//负责EdgeBox的实现
bool EdgeBox::init() {
Node::init();//调用Node父类的init方法
//设置锚点
Size visiableSize = Director::getInstance()->getVisibleSize();
setAnchorPoint(cocos2d::Vec2(0.5,0.5));
setContentSize(visiableSize);
setPhysicsBody(PhysicsBody::createEdgeBox(visiableSize));
//配置边界框
return true;
}
</pre>
2.创建物理世界
在Cocos2D的代码构成主要由下图组成
而我们知道Cocos2D项目的入口是从AppDelegate进入的，而里面有三个比较重要的方法
- applicationDidFinishLaunching()
应用程序启动后调用。默认的实现中已经包含了游戏启动的必要准备。
因为我们的游戏是竖屏的，所以需要添加屏幕的宽高设置
<pre>glview->setDesignResolutionSize(480, 800, ResolutionPolicy::EXACT_FIT);
if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32) || (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
glview->setFrameSize(360, 600);
endif
</pre>
<pre>
bool AppDelegate::applicationDidFinishLaunching() {
// initialize director
auto director = Director::getInstance();
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("noonedies", cocos2d::Rect(0, 0, designResolutionSize.width, designResolutionSize.height));
-#else
glview = GLViewImpl::create("noonedies");
-#endif
director->setOpenGLView(glview);
}
glview->setDesignResolutionSize(480, 800, ResolutionPolicy::EXACT_FIT);
-#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32) || (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)
glview->setFrameSize(360, 600);
endif
// turn on display FPS
director->setDisplayStats(true);
// set FPS. the default value is 1.0/60 if you don't call this
director->setAnimationInterval(1.0f / 60);
// create a scene. it's an autorelease object
auto scene = HelloWorld::createScene();
// run
director->runWithScene(scene);
return true;
}
</pre>
-
applicationDidEnterBackground()
程序进入后台时调用。接打电话时。暂停音乐和动作.
<pre>// This function will be called when the app is inactive. Note, when receiving a phone call it is invoked.
void AppDelegate::applicationDidEnterBackground() {
Director::getInstance()->stopAnimation();// if you use SimpleAudioEngine, it must be paused
// SimpleAudioEngine::getInstance()->pauseBackgroundMusic();
}</pre> -
applicationDidEnterForeground()
与applicationDidEnterBG()成对出现，应用程序回到前台时使用。
<pre>
// This function will be called when the app is inactive. Note, when receiving a phone call it is invoked.
void AppDelegate::applicationDidEnterBackground() {
Director::getInstance()->stopAnimation();// if you use SimpleAudioEngine, it must be paused
// SimpleAudioEngine::getInstance()->pauseBackgroundMusic();
}
// this function will be called when the app is active again
void AppDelegate::applicationWillEnterForeground() {
Director::getInstance()->startAnimation();
// if you use SimpleAudioEngine, it must resume here
// SimpleAudioEngine::getInstance()->resumeBackgroundMusic();
}</pre>
<h4>auto scene = HelloWorld::createScene();
director->runWithScene(scene);</h4>
这句就是程序的场景入口！
而我们进入了HelloScene场景后，在创建场景的createScene()方法内将Scene::create()改为 Scene::createWithPhysics()，则创建了物理世界
scene->getPhysicsWorld()->setGravity(Vec2(0, -1000));
设置了重力加速度是1000
之后我们要设置边界框！！
3.添加边界框场景
首先声明一个C++头文件，命名为EdgeBox，继承于Node
在头文件里面，新建一个类EdgeBox，声明初始化方法并调用CREATE_FUNC(EdgeBox)创建
<pre>#pragma once
#include <cocos2d.h>#include <iostream>
USING_NS_CC;
class EdgeBox :public Node
{
public:
virtual bool init();
CREATE_FUNC(EdgeBox);
};
</pre>
而设置边界框，需要先获取屏幕的宽高，并在物理世界配置的边界框
<pre>
include "EdgeBox.h"
bool EdgeBox::init() {
Node::init();
Size visiableSize = Director::getInstance()->getVisibleSize();//获取屏幕宽高
setAnchorPoint(cocos2d::Vec2(0.5,0.5)); //设置锚点
setContentSize(visiableSize); //设置内容宽高
setPhysicsBody(PhysicsBody::createEdgeBox(visiableSize));//配置边界框
return true;
}
</pre>
最后将边界框添加到HelloWorld场景中
<pre>
auto edge = EdgeBox::create();
edge->setContentSize(visiableSize);
edge->setPosition(visiableSize.width / 2, visiableSize.height / 2+ positionY);
edge->setContentSize(visiableSize);
addChild(edge);
</pre>
大功告成！
项目git地址：https://github.com/marco115/NoOneDies.git
对文章有什么优化改进的地方，请留言！谢谢大家
