cocos2d-x3.2 多点缩放单点滑动

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#ifndef __HELLOWORLD_SCENE_H__#define __HELLOWORLD_SCENE_H__#include "cocos2d.h"USING_NS_CC;class HelloWorld : public cocos2d::Layer{public:    // there's no 'id' in cpp, so we recommend returning the class instance pointer    static cocos2d::Scene* createScene();    virtual bool init();        // implement the "static create()" method manually    CREATE_FUNC(HelloWorld);    void onTouchesBegan(const std::vector<cocos2d::Touch*>& touches,cocos2d::Event* event);    void onTouchesMoved(const std::vector<cocos2d::Touch*>& touches,cocos2d::Event* event);        Sprite* bgSprite;    Vec2 bgOrigin;    Layer* mapLayer;    };#endif // __HELLOWORLD_SCENE_H__

HelloWorld.cpp

#include "HelloWorldScene.h"USING_NS_CC;Scene* HelloWorld::createScene(){    // 'scene' is an autorelease object    auto scene = Scene::create();        // 'layer' is an autorelease object    auto layer = HelloWorld::create();    // add layer as a child to scene    scene->addChild(layer);    // return the scene    return scene;}// on "init" you need to initialize your instancebool HelloWorld::init(){    //////////////////////////////    // 1. super init first    if ( !Layer::init() )    {        return false;    }        /////////////////////////////    mapLayer = Layer::create();    this->addChild(mapLayer,-1);        bgSprite = Sprite::create("2.jpg");    bgSprite->setAnchorPoint(Vec2::ZERO);    bgSprite->setPosition(Vec2::ZERO),    bgOrigin = Vec2(Vec2::ZERO);    mapLayer->addChild(bgSprite);        auto treeSprite = Sprite::create("1.png");    treeSprite->setAnchorPoint(Vec2::ZERO);    treeSprite->setPosition(Vec2::ZERO),    treeSprite->setScale(2);    bgSprite->addChild(treeSprite, 2);        auto map = TMXTiledMap::create("mymap4.tmx");    map->setAnchorPoint(Vec2::ZERO);    map->setPosition(Vec2::ZERO),    bgSprite->addChild(map, 1);        auto listener = EventListenerTouchAllAtOnce::create();    listener->onTouchesBegan = CC_CALLBACK_2(HelloWorld::onTouchesBegan, this);    listener->onTouchesMoved = CC_CALLBACK_2(HelloWorld::onTouchesMoved, this);    _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, bgSprite);        return true;}void HelloWorld::onTouchesBegan(const std::vector<cocos2d::Touch*>& touches,cocos2d::Event* event){    CCLOG("touch begin");}void HelloWorld::onTouchesMoved(const std::vector<cocos2d::Touch*>& touches,cocos2d::Event* event){    CCLOG("touch moved");        auto winSize = Director::getInstance()->getWinSize();    if(touches.size() > 1)        // 多点进行缩放    {        CCLOG("多点缩放");        // 得到当前两触摸点        auto point1 = touches[0]->getLocation();        auto point2 = touches[1]->getLocation();        // 计算两点之间得距离        auto currDistance = point1.distance(point2);        // 计算两触摸点上一时刻之间得距离        auto prevDistance = touches[0]->getPreviousLocation().distance(touches[1]->getPreviousLocation());        // 两触摸点与原点的差向量，pointVec1和pointVec2是相对于bgSprite的位置        auto pointVec1 = point1  - bgOrigin;        auto pointVec2 = point2  - bgOrigin;        // 两触摸点的相对中点        auto relMidx = (pointVec1.x + pointVec2.x) / 2 ;        auto relMidy = (pointVec1.y + pointVec2.y) / 2 ;        // 计算bgSprite的锚点        auto anchorX = relMidx / bgSprite->getBoundingBox().size.width;        auto anchorY = relMidy / bgSprite->getBoundingBox().size.height;        // 相对屏幕的中点        auto absMidx = (point2.x + point1.x) / 2 ;        auto absMidy = (point2.y + point1.y) / 2 ;                // 缩放时，为了避免出现空白的区域，需要做以下的边界处理。        // 当bgSprite快要进入到屏幕时，修改bgSprite的位置（既absMidx和absMidy）。        if(  bgOrigin.x > 0)        {            absMidx -= bgOrigin.x;        }        if( bgOrigin.x < -bgSprite->getBoundingBox().size.width + winSize.width )        {            absMidx +=  -bgSprite->getBoundingBox().size.width + winSize.width - bgOrigin.x;        }        if( bgOrigin.y > 0 )        {            absMidy -= bgOrigin.y;        }        if( bgOrigin.y < -bgSprite->getBoundingBox().size.height + winSize.height )        {            absMidy +=  -bgSprite->getBoundingBox().size.height + winSize.height - bgOrigin.y;        }        // 重设bgSprite锚点和位置        bgSprite->setAnchorPoint(Vec2(anchorX, anchorY));        bgSprite->setPosition(Vec2(absMidx, absMidy));        // 根据两触摸点前后的距离计算缩放倍率        auto scale = bgSprite->getScale() * ( currDistance / prevDistance);        // 控制缩放倍率在1～4倍之间，最小倍率不能太小，不让背景将不能填充满整个屏幕。        scale = MIN(4,MAX(1, scale));        bgSprite->setScale(scale);        // 更新原点位置        bgOrigin = Vec2(absMidx, absMidy) - Vec2(bgSprite->getBoundingBox().size.width * anchorX, bgSprite->getBoundingBox().size.height * anchorY) ;    }    else if(touches.size() == 1)        // 单点进行移动    {        CCLOG("单点移动");        // 单点时，touches中只有一个Touch对象，所以通过touches[0]就可以得到触摸对象        auto touch = touches[0];        // 计算滑动过程中的滑动增量        auto diff = touch->getDelta();        // 得到当前bgSprite的位置        auto currentPos = bgSprite->getPosition();        // 得到滑动后bgSprite应该所在的位置        auto pos = currentPos + diff;        // 得到此刻bgSprite的尺寸        auto bgSpriteCurrSize = bgSprite->getBoundingBox().size;                //边界控制，约束pos的位置        pos.x = MIN(pos.x, bgSpriteCurrSize.width * bgSprite->getAnchorPoint().x);        pos.x = MAX(pos.x, -bgSpriteCurrSize.width + winSize.width + bgSpriteCurrSize.width * bgSprite->getAnchorPoint().x);        pos.y = MIN(pos.y, bgSpriteCurrSize.height * bgSprite->getAnchorPoint().y);        pos.y = MAX(pos.y, -bgSpriteCurrSize.height + winSize.height + bgSpriteCurrSize.height * bgSprite->getAnchorPoint().y);        // 重设bgSprite位置        bgSprite->setPosition(pos);                // 更新原点位置        if( pos.x >= bgSpriteCurrSize.width * bgSprite->getAnchorPoint().x           || pos.x <= -bgSpriteCurrSize.width + winSize.width + bgSpriteCurrSize.width * bgSprite->getAnchorPoint().x)        {            diff.x = 0;        }        if( pos.y >= bgSpriteCurrSize.height * bgSprite->getAnchorPoint().y           || pos.y <= -bgSpriteCurrSize.height + winSize.height + bgSpriteCurrSize.height * bgSprite->getAnchorPoint().y)        {            diff.y = 0;        }        bgOrigin += diff;    }}

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