本次主要需要用到的函式
CC_SYNTHESIZE
此函式是為你的函式生成set，get方法的，如何僅僅需要全域性函式，只需要靜態方法即可

#define CC_SYNTHESIZE(varType, varName, funName)\
protected: varType varName;\
public: virtual varType get##funName(void) const { return varName; }\
public: virtual void set##funName(varType var){ varName = var; }

goto next
強制調到next後面的語句

Rect
rect 對應四個引數 繪製點的x座標，繪製點的y座標，寬度，高度
本次應該注意的問題：1.標頭檔案的順序一定要放好，否則莫名的錯誤一大堆，2.由於cocos中文亂碼問題，所以暫時以123代替相撞，以456代替不相撞，關於亂碼問題的解決筆者會在下次部落格中給出解決
cocos2d碰撞問題：點與矩形的碰撞，矩形與圓形的碰撞

這次我們主要介紹矩形與圓形的碰撞
首先以圓心為原點建立座標系

分兩種情況：矩形在單個象限內，怎麼判斷矩形在一個象限裡？只要判斷對角
座標是否同號就可以了，1.單個象限判斷：判斷矩形四個頂點的距離與圓心的距離；
2.多個象限判斷：判斷矩形與圓的外切正方形是否相交

//碰撞問題的封裝（.h檔案）
#ifndef _circle_H_
#define _circle_H_

#include <iostream>
#include "cocos2d.h"
using namespace std;
using namespace cocos2d;

class circle
{
public:
    CC_SYNTHESIZE(float, _radius, Radius);
    CC_SYNTHESIZE(Point, _position, Position);

    circle(float radius, Point position):_radius(radius), _position(position){};

    bool
 
 isContant(Rect rect);
};


#endif /* !_circle_H_*/ </iostream>

//碰撞問題封裝（.cpp）
#include "circle.h"
USING_NS_CC;

bool circle::isContant(Rect rect){
    bool _isContant = false;
    Point origin = _position;   //圓心
    //圓的正切矩形
    Rect squareone = Rect::Rect(_position.x - _radius, _position.x - _radius, 2 * _radius, 2 * _radius);
    do 
    {
        Point rect0 = rect.origin;
        Point rect1 = rect.origin + Point(rect.size.width, 0);
        Point rect2 = rect.origin + Point(rect.size.width, rect.size.height);
        Point rect3 = rect.origin + Point(0, rect.size.height);
        Point pos[] = { rect0, rect1, rect2, rect3 };
        if ((pos[1].x-origin.x)*(pos[2].x-origin.x)>0&&(pos[1].y-origin.y)*(pos[2].y - origin.y)>0)
        {
            for (int i = 0; i < 4;i++)
            {
                if ((pos[i].x - origin.x)*(pos[i].x - origin.x) + (pos[i].y - origin.y)*(pos[i].y - origin.y) < _radius*_radius){
                    goto next;
                }   
            }
        }

        if(squareone.intersectsRect(rect))
        {
            goto next;
        }

        for (int i = 0; i < 4;i++)
        {
            if (pos[i] == origin){
                goto next;
            }           
        }

        break;
        next:
        _isContant = true;

    } while (0);
    return _isContant;
}

//碰撞問題測試（.cpp）
#include "circle.h"
#include "test.h"

USING_NS_CC;

Scene* test::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();

    // 'layer' is an autorelease object
    auto layer = test::create();

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

    // return the scene
    return scene;
}


bool test::init()
{

    Size visibleSize = Director::getInstance()->getVisibleSize();
    Point origin = Director::getInstance()->getVisibleOrigin();

    auto player = Sprite::create("player.png");
    player->setPosition(visibleSize.width / 2, visibleSize.height / 2);
    addChild(player);

    auto icon = Sprite::create("icon.png");
    icon->setPosition(player->getPositionX() - 100, visibleSize.height / 2);
    addChild(icon);

    circle iconone = circle(icon->getContentSize().width / 2, icon->getPosition());
    Rect rect = Rect::Rect(player->getPositionX() - player->getContentSize().width / 2, player->getPositionY() - player->getContentSize().height / 2, player->getContentSize().width, player->getContentSize().height);

    if (iconone.isContant(rect))
    {
        CCLOG("123");
    }
   else
   {
       CCLOG("456");
   }

    float radius = 100;
    Point position =Point(0, 100);
    circle ico = circle(radius, position);

    Rect rec = Rect::Rect(0, 100, 60, 60);
    if (ico.isContant(rec))
    {
        CCLOG("123");    //由於cocos中文亂碼問題，所以暫時以123代替相撞，以456代替不相撞
    }
    else{
        CCLOG("456");
    }

    return true;
}

//碰撞問題測試（.h）
#ifndef _test_H_
#define _test_H_

#include "cocos2d.h"
using namespace cocos2d;

class test:public cocos2d::Layer
{
public:
    static cocos2d::Scene* createScene();
    virtual bool init();
    CREATE_FUNC(test);
};

#endif

在AppDelegate.cpp裡設定test為啟動專案即可