cocos2dx 3.x(捕鱼达人炮台角度换算)

 //
 //  GameScence.hpp
 //  NotesDamo
 //
 //  Created by apple on 16/10/23.
 //
 //

 #ifndef GameScence_hpp
 #define GameScence_hpp

 #include <stdio.h>
 #include "cocos2d.h"

 class GameScence : public cocos2d::Layer
 {
 private:
     //创建一个私有的精灵成员变量
     cocos2d::Sprite * m_spriteGun;
 public:

     static cocos2d::Scene* createScene();//声明创建当前的层

     virtual bool init();//声明初始化层实例函数。

     bool onTouchBegan(cocos2d::Touch* touch, cocos2d::Event* event);//手势点击事件

         CREATE_FUNC(GameScence);//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)；

 };
 #endif /* GameScence_hpp */

 //
 //  GameScence.cpp
 //  NotesDamo
 //
 //  Created by apple on 16/10/23.
 //
 //

 #include "GameScence.hpp"

 USING_NS_CC;

 Scene* GameScence::createScene()
 {
     auto scene = Scene::create();

     auto layer = GameScence::create();

     scene->addChild(layer);

     return scene;
 }

 GameScence::GameScence()
 {

 }
 bool GameScence::init()
 {
     //////////////////////////////
     // 1. super init first
     // 初始化父类
     if ( !Layer::init() )
     {
         return false;
     }

 m_spriteGun = Sprite::create(StringUtils::format("gun2_0.png"));
         m_spriteGun->setPosition(, );
         this ->addChild(m_spriteGun);

     //声明
     auto listener = EventListenerTouchOneByOne::create();
     listener->setSwallowTouches(true);

     //注册事件
     listener->onTouchBegan = CC_CALLBACK_2(GameScence::onTouchBegan, this);

     _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

     return true;
 }

 bool GameScence::onTouchBegan(cocos2d::Touch* touch, cocos2d::Event* event)
 {

     touch->getLocation();//    获取当前点击的坐标

     m_spriteGun->cocos2d::Node::setRotation(atan2((touch->getLocation().x-m_spriteGun->getPositionX()),(touch->getLocation().y-m_spriteGun->getPositionY()))*/3.1415926);//改变弧度 后面加不加90要根据精灵的初始角度是怎样的

     return true;
 }