重新写了地图双指缩放和单指拖动，适合所有机型屏幕配置

概述前面已经写过一篇了，在这里就不具体解释细节了，大体原理都是一样的，双指缩放还是根据双指间占原距离的比例进行缩放。下面直接上代码了： .h #ifndef __MAPLAYER_H#define __MAPLAYER_H#include "cocos2d.h"using namespace cocos2d;class MapLayer:public Layer{public: Vec2

前面已经写过一篇了，在这里就不具体解释细节了，大体原理都是一样的，双指缩放还是根据双指间占原距离的比例进行缩放。下面直接上代码了：

.h

#ifndef __MAPLAYER_H#define __MAPLAYER_H#include "cocos2d.h"using namespace cocos2d;class MapLayer:public Layer{public:	Vec2 mpOrigin;	virtual bool init();	CREATE_FUNC(MapLayer);private:};#endif // !__MAPLAYER_H

下面是 .cpp注释写的很详细不明白的话可以细看

auto dis = Director::getInstance()->getEventdispatcher();	auto Listen = EventListenertouchAllAtOnce::create();	Listen->ontouchesMoved = [=](const std::vector<touch*>& touches,Event  *event){		if(touches.size() > 1)        // 多点进行缩放		{			// 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maplayer的位置			auto pointVec1 = point1  - mpOrigin;			auto pointVec2 = point2  - mpOrigin;			// 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maplayer的锚点			auto anchorX = relMIDx / maplayer->getBoundingBox().size.wIDth;			auto anchorY = relMIDy / maplayer->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maplayer的位置（既absMIDx和absMIDy）。			if(  mpOrigin.x > 0)			{				absMIDx -= mpOrigin.x;			}			if( mpOrigin.x < -maplayer->getBoundingBox().size.wIDth + winSize.wIDth )			{				absMIDx +=  -maplayer->getBoundingBox().size.wIDth + winSize.wIDth - mpOrigin.x;			}			if( mpOrigin.y > 0 )			{				absMIDy -= mpOrigin.y;			}			if( mpOrigin.y < -maplayer->getBoundingBox().size.height + winSize.height )			{				absMIDy +=  -maplayer->getBoundingBox().size.height + winSize.height - mpOrigin.y;			}			// 重设bgSprite锚点和位置			maplayer->setAnchorPoint(Vec2(anchorX,anchorY));			maplayer->setposition(Vec2(absMIDx,absMIDy));			// 根据两触摸点前后的距离计算缩放倍率			auto scalex = maplayer->getScaleX() * (currdistance / prevdistance);			auto scaley = scalex * RATIO;			// 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。			scalex = MIN(1.8,MAX(preScalex,scalex));			scaley = MIN(1.8,MAX(preScaley,scaley));			maplayer->setScale(scalex,scaley);			// 更新原点位置			mpOrigin = Vec2(absMIDx,absMIDy) - Vec2(maplayer->getBoundingBox().size.wIDth * anchorX,maplayer->getBoundingBox().size.height * anchorY) ;		}		else if(touches.size() == 1)        // 单点进行移动		{			// 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maplayer的位置			auto currentPos = maplayer->getposition();			// 得到滑动后maplayer应该所在的位置			auto pos = currentPos + diff;			// 得到此刻maplayer的尺寸			auto maplayerCurrSize = maplayer->getBoundingBox().size;			//边界控制，约束pos的位置			pos.x = MIN(pos.x,maplayerCurrSize.wIDth * maplayer->getAnchorPoint().x);			pos.x = MAX(pos.x,-maplayerCurrSize.wIDth + winSize.wIDth + maplayerCurrSize.wIDth * maplayer->getAnchorPoint().x);			pos.y = MIN(pos.y,maplayerCurrSize.height * maplayer->getAnchorPoint().y);			pos.y = MAX(pos.y,-maplayerCurrSize.height + winSize.height + maplayerCurrSize.height * maplayer->getAnchorPoint().y);			// 重设bgSprite位置			maplayer->setposition(pos);			// 更新原点位置			if( pos.x >= maplayerCurrSize.wIDth * maplayer->getAnchorPoint().x				|| pos.x <= -maplayerCurrSize.wIDth + winSize.wIDth + maplayerCurrSize.wIDth * maplayer->getAnchorPoint().x)			{				diff.x = 0;			}			if( pos.y >= maplayerCurrSize.height * maplayer->getAnchorPoint().y				|| pos.y <= -maplayerCurrSize.height + winSize.height + maplayerCurrSize.height * maplayer->getAnchorPoint().y)			{				diff.y = 0;			}			mpOrigin += diff;		}	};	dis->addEventListenerWithSceneGraPHPriority(Listen,maplayer);

这样就能解决缩放与拖动了。

总结

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