cocos2d-x多点触控实现缩放及相关问题的解决方法
2016-02-09 11:50
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cocos2d-x 多点触控实现缩放及相关问题的解决方法
标签: cocos2d-x2013-08-30 11:39 10935人阅读 评论(15) 收藏 举报
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Cocos2d-x学习笔记(30)
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首先,来看下代码:
声明文件:
[cpp] view
plain copy
#ifndef __loading__MoreTouches__
#define __loading__MoreTouches__
#include <iostream>
#include "cocos2d.h"
USING_NS_CC;
class MoreTouches :public CCLayer
{
public:
bool init();
//virtual void registerWithTouchDispather(void); //由于是继承自CCLayer,这个方法就不用重写了,但下面几个方法还是要重写滴
virtual void ccTouchesCancellnd(CCSet *pTouches,CCEvent *pEvent);
virtual void ccTouchesBegan(CCSet *pTouches,CCEvent *pEvent);//注意这个方法和单点触控方法的返回类型不同
virtual void ccTouchesEnded(CCSet *pTouches,CCEvent *pEvent);
virtual void ccTouchesMoved(CCSet *pTouches,CCEvent *pEvent);
static CCScene *scene();
virtual void onEnter();
virtual void onExit();
CREATE_FUNC(MoreTouches);
public:
double distance; //两个触摸点之间的距离
double deltax; //目标x轴的改变值
double deltay; //目标y轴的改变值
CCSprite *bg; //目标精灵
double mscale; //初始地图缩放比例
};
#endif /* defined(__loading__MoreTouches__) */
定义文件:
[cpp] view
plain copy
#include "MoreTouches.h"
bool MoreTouches::init()
{
if(!CCLayer::init())
{
return false;
}
bg=CCSprite::create("fullbg.png"); //初始化目标图片
this->addChild(bg);
mscale=1.0; //初始化图片的缩放比例
return true;
}
//void MoreTouches::registerWithTouchDispather()
//{
// CCDirector::sharedDirector()->getTouchDispatcher()->addStandardDelegate(this, 0);
//}
void MoreTouches::ccTouchesBegan(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
if(pTouches->count()>=2) //如果触摸点不少于两个
{
CCSetIterator iter=pTouches->begin();
CCPoint mPoint1=((CCTouch *)(*iter))->getLocationInView();
mPoint1 = CCDirector::sharedDirector()->convertToGL(mPoint1);
iter++;
CCPoint mPoint2=((CCTouch *)(*iter))->getLocationInView();
mPoint2 = CCDirector::sharedDirector()->convertToGL(mPoint2);
distance=sqrt((mPoint2.x-mPoint1.x)*(mPoint2.x-mPoint1.x)+(mPoint2.y-mPoint1.y)*(mPoint2.y-mPoint1.y));//计算两个触摸点距离
deltax = (mPoint1.x + mPoint2.x)/2 - bg->getPositionX(); //得到两个触摸点中点和精灵锚点的差值
deltay = (mPoint1.y + mPoint2.y)/2 - bg->getPositionY();
CCLog("ccTouchesBegan ...");
}
}
void MoreTouches::ccTouchesMoved(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
if(pTouches->count()>=2) //如果移动时触摸点的个数不少于两个
{
CCSetIterator iter = pTouches->begin();
CCPoint mPoint1 = ((CCTouch*)(*iter))->getLocationInView();
mPoint1 = CCDirector::sharedDirector()->convertToGL(mPoint1);
iter++;
CCPoint mPoint2 = ((CCTouch*)(*iter))->getLocationInView();
mPoint2 = CCDirector::sharedDirector()->convertToGL(mPoint2); //获得新触摸点两点之间的距离
double mdistance = sqrt((mPoint1.x-mPoint2.x)*(mPoint1.x-mPoint2.x)+(mPoint1.y-mPoint2.y)*(mPoint1.y-mPoint2.y));
mscale = mdistance/distance * mscale; // 新的距离 / 老的距离 * 原来的缩放比例,即为新的缩放比例
distance = mdistance;
bg->setScale(mscale);
double x = (mPoint2.x+mPoint1.x)/2 - deltax; //计算两触点中点与精灵锚点的差值
double y = (mPoint2.y+mPoint1.y)/2 - deltay;
bg->setPosition(ccp(x,y)); //保持两触点中点与精灵锚点的差值不变
deltax = (mPoint1.x+ mPoint2.x)/2 - bg->getPositionX(); //计算新的偏移量
deltay = (mPoint2.y + mPoint1.y)/2 - bg->getPositionY();
CCLog("ccTouchMoved ....");
}
if(pTouches->count()==1) //如果触摸点为一个
{
CCSetIterator iter = pTouches->begin();
CCPoint mPoint=((CCTouch*)(*iter))->getLocationInView();
mPoint=CCDirector::sharedDirector()->convertToGL(mPoint); //坐标转换
bg->setPosition(mPoint); //直接移动精灵
}
}
void MoreTouches::ccTouchesEnded(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
}
void MoreTouches::ccTouchesCancellnd(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
}
CCScene *MoreTouches::scene()
{
CCScene *scene=CCScene::create();
MoreTouches *layer=MoreTouches::create();
scene->addChild(layer);
return scene;
}
void MoreTouches::onEnter()
{
CCLayer::onEnter();
setTouchEnabled(true);CCLog("onenter");
}
void MoreTouches::onExit()
{
CCLayer::onExit();
CCDirector::sharedDirector()->getTouchDispatcher()->removeDelegate(this); //移除触摸代理
}
首先要实现缩放这个逻辑,在ccTouchesBegan中检测,如果触摸点的个数大于两个,那么取前两个点,使用两点距离公式计算两点距离,在ccTouchesMoved中检测,如果触摸点的个数大于两个,那么继续计算这两个点的距离,然后通过距离,计算得到缩放比例,调用setScale设置缩放比例即可。
另外,除了缩放处理外,还需要处理位置问题,在ccTouchesBegan中计算两个触点的中点位置和精灵锚点的差,在ccTouchesMoved中,随着缩放,保持两触点中点和精灵锚点的差不变即可,ccTouchesEnded和ccTouchesCancelled中不需要修改。
接下来,就重点说下在实现时遇到的问题吧,主要就一个,就是当在ios模拟器中操作时,我按着option键,可以出现两个点,但程序中始终只能得到一个点,即count=1,
移动时也根本不能实现缩放。后来,终于谷歌出结果了,原来需要修改ios目录下的 AppController.mm文件
[cpp] view
plain copy
static AppDelegate s_sharedApplication;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
// Add the view controller's view to the window and display.
window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
EAGLView *__glView = [EAGLView viewWithFrame: [window bounds]
pixelFormat: kEAGLColorFormatRGBA8
depthFormat: GL_DEPTH_COMPONENT16
preserveBackbuffer: NO
sharegroup: nil
multiSampling: NO
numberOfSamples:0 ];
// Use RootViewController manage EAGLView
viewController = [[RootViewController alloc] initWithNibName:nil bundle:nil];
viewController.wantsFullScreenLayout = YES;
viewController.view = __glView;
// Set RootViewController to window
if ( [[UIDevice currentDevice].systemVersion floatValue] < 6.0)
{
// warning: addSubView doesn't work on iOS6
[window addSubview: viewController.view];
}
else
{
// use this method on ios6
[window setRootViewController:viewController];
}
[window makeKeyAndVisible];
[[UIApplication sharedApplication] setStatusBarHidden: YES];
cocos2d::CCApplication::sharedApplication()->run();
[__glView setMultipleTouchEnabled:YES]; //主要就是这句了
return YES;
}
简单来说,就是:AppController.mm 里要启用多点触摸才可以,在- (BOOL)application:(UIApplication *)application添加[__glView setMultipleTouchEnabled:YES];
这样,当我们按着option键和鼠标时,移动鼠标,就可以实现缩放了,当只用鼠标时,可以实现图片的移动,问题解决。
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