cocos2dx 3.x(精灵的碰撞检测，点击移动与拖动精灵)

//
//  MainScene.hpp
//  helloworld
//
//  Created by apple on 16/9/19.
//
//

#ifndef MainScene_hpp
#define MainScene_hpp

#include <stdio.h>
#include "cocos2d.h"
USING_NS_CC;
using namespace cocos2d;
//定义一个场景类

class MainScene : public cocos2d::Layer{
    
private:
    // 成员变量(私有的)
    Size size;//注意不能用auto关键字
    Sprite *sprite1, *sprite2;//定义两个成员变量的精灵(注意不能用auto关键字
    Label *label;//全局变量Label->显示碰撞与未碰撞(注意不能用auto关键字)
public:
    virtual bool init(); // 虚函数，返回值为布尔类型，没有函数

    static cocos2d::Scene* createScene();//static是一个类方法返回场景
    //声明点击手势
    virtual bool onTouchBegan(Touch *touch, Event *unused_event);
    //声明拖动手势
    virtual void onTouchMoved(Touch *touch, Event *unused_event);
    
    CREATE_FUNC(MainScene);
};


#endif /* MainScene_hpp */

//
//  MainScene.cpp
//  helloworld
//
//  Created by apple on 16/9/19.
//
//

#include "MainScene.hpp"
cocos2d::Scene * MainScene::createScene()
{
     auto scene = Scene::create();
//    CCScene * scene = CCScene::create();// 创建场景
    //创建层
    MainScene *layer = MainScene::create();
    scene->addChild(layer);
    return scene;
}
bool MainScene::init(){
    if (!Layer::init()) {
        return false;
    }
    //获取屏幕大小
    size = Director::getInstance()->getVisibleSize();
    //auto size = Director::getInstance()->getWinSize();
    //添加一个图片精灵
    sprite1 = Sprite::create("CloseNormal.png");
    sprite1->setPosition(Vec2(size.width/2, size.height/2));
    this->addChild(sprite1);
    
    sprite2 = Sprite::create("CloseNormal.png");
    sprite2->setPosition(Vec2(size.width*0.4, size.height/2));
    this->addChild(sprite2);
    
    label = Label::createWithSystemFont("No collision", "Marker Felt", 50);
    label->setPosition(Vec2(size.width/2, size.height*0.7));
    this->addChild(label);//直接把Label显示在屏幕上
    
    //创建监听事件对象
    auto listener = EventListenerTouchOneByOne::create();
    
    //定义监听事件的回调函数
    listener->onTouchBegan = CC_CALLBACK_2(MainScene::onTouchBegan, this);
    listener->onTouchMoved = CC_CALLBACK_2(MainScene::onTouchMoved, this);
    
    //在事件分发器中注册
    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);
    
    return true;
}

//点击移动精事件回调方法
bool MainScene::onTouchBegan(Touch *touch, Event *unused_event)
{
    //获取触屏位置（坐标）
    Point pos = touch->getLocation();
    
    sprite2->setPosition(pos);//把点击屏幕的触摸点（坐标）给赋值给精灵2
    
    log("TouchBegan");
    
    return true;
}
//拖动手势执行事件方法
void MainScene::onTouchMoved(Touch *touch, Event *unused_event)
{
    //获取当前拖动手势的坐标与位置
    Point pos = touch->getLocation();
    
    sprite2->setPosition(pos);//让精灵跟着拖动点移动
    
    //判断两个精灵是否相交
    if (sprite2->getBoundingBox().intersectsRect(sprite1->getBoundingBox())){    //3.0改变处
        label->setString("Collision!");//改变屏幕上Label的文字
    }else{
        label->setString("No collision");//改变屏幕上Label的文字
    
        log("TouchMoved");
    }
}