#ifndef __LOL__TE_MENU_H__
#define __LOL__TE_MENU_H__
#include "cocos2d.h"
/*
*模仿英雄联盟的皮肤选择菜单
*不同点在于，英雄联盟当皮肤过多时，部分皮肤会移出边缘，不显示
*我会显示所以菜单项，向边缘移动会不断减缓
*/
class LOLMenu :public cocos2d::Layer{
public:
	//构造方法
	CREATE_FUNC(LOLMenu);
	//添加菜单项
	void addMenuItem(cocos2d::MenuItem *item);
	//更新位置
	void updatePosition();
	//更新位置，有动画
	void updatePositionWithAnimation();
	//位置矫正  修改位置forward为移动方向  当超过1/3，进1
	//true 为正向  false 负
	void rectify(bool forward);
	//初始化
	virtual bool init();
	//重置  显示所引号设置为0
	void reset();
private:
	//设置当前显示索引
	void setIndex(int index);
	//设置当前显示菜单项的索引号
	float getIndex();
	//返回被选中的item
	cocos2d::MenuItem * getCurrentItem();
	//数学计算式width*index/(abs(index)+CALC_A),其中CALC_A为常数
	float calcFunction(float index,float width);
private:
	//菜单菜单项的索引号
	float _index;
	//上一次菜单项的索引号
	float _lastIndex;
	//菜单项集合,_children顺序会变化，新建数组保存顺序
	cocos2d::Vector<cocos2d::MenuItem *> _items;
	//监听函数
	virtual bool onTouchBegan(cocos2d::Touch* touch,cocos2d::Event* event);
	virtual void onTouchEnded(cocos2d::Touch* touch,cocos2d::Event* event);
	virtual void onTouchMoved(cocos2d::Touch* touch,cocos2d::Event* event);
	//动画完结调用函数，这个主要是确定哪一个菜单项在前面
	void actionEndCallBack(float dx);
	//当前被选择的item
	cocos2d::MenuItem *_selectedItem;
};
#endif

LOLMenu.cpp

#include "LOLMenu.h"
#include <math.h>
#define PI acos(-1)
//菜单的缩小比例 最小的比例是1-MENU_SCALE
#define MENU_SCALE 0.3
//菜单的倾斜度 最多为45度
#define MENU_ASLOPE 60.0
//calcFunction(x) 为 x/(x+a),其中a为常数
#define CALC_A 1
//动画运行时间
#define ANIMATION_DURATION  0.3f 
//菜单项的大小与屏幕的比例，当然可以通过setContentSize设置
#define CONTENT_SIZE_SCALE (2.0/3)
//菜单项长度与菜单长度的比例 滑动一个菜单项长度，菜单项变化一个
#define ITEM_SIZE_SCALE (1.0/4)
/*
	代码里面还有可以设置的参数，这里没有一一例出或给出函数
	*/
USING_NS_CC;
bool LOLMenu::init(){
	if (!Layer::init())
		return false;
	_index=0;
	_lastIndex = 0;
	this->ignoreAnchorPointForPosition(false);
	_selectedItem = nullptr;
	auto size = Director::getInstance()->getWinSize();
	this->setContentSize(size*CONTENT_SIZE_SCALE);
	this->setAnchorPoint(Vec2(0.5f,0.5f));
	auto listener = EventListenerTouchOneByOne::create();
	listener->onTouchBegan = CC_CALLBACK_2(LOLMenu::onTouchBegan,this);
	listener->onTouchMoved = CC_CALLBACK_2(LOLMenu::onTouchMoved,this);
	listener->onTouchEnded = CC_CALLBACK_2(LOLMenu::onTouchEnded,this);
	getEventDispatcher()->addEventListenerWithSceneGraPHPriority(listener,this);
	return true;
};

void LOLMenu::addMenuItem(cocos2d::MenuItem *item){
	item->setPosition(this->getContentSize() / 2);
	this->addChild(item);
	_items.pushBack(item);
	reset();
	//如果希望开始没有移动效果，改成updatePosition函数即可
	updatePositionWithAnimation();
	return;
}
void LOLMenu::updatePosition(){
	auto menuSize = getContentSize();
	for (int i = 0; i < _items.size(); i++){
		//设置位置
		float x = calcFunction(i - _index,menuSize.width / 2);
		_items.at(i)->setPosition(Vec2(menuSize.width/2+x,menuSize.height/2));
		//设置zOrder,即绘制顺序
		_items.at(i)->setZOrder(-abs((i - _index) * 100));
		//设置伸缩比例
		_items.at(i)->setScale(1.0-abs(calcFunction(i - _index,MENU_SCALE)));
		//设置倾斜，Node没有setCamera函数，将OrbitCamera的运行时间设为0来达到效果
		auto orbit1 = OrbitCamera::create(0,1,calcFunction(i - _lastIndex,MENU_ASLOPE),MENU_ASLOPE) - calcFunction(i - _index,0);
		_items.at(i)->runAction(orbit1);
	}
	return;
}
void LOLMenu::updatePositionWithAnimation(){
	//先停止所有可能存在的动作
	for (int i = 0; i < _items.size(); i++)
		_items.at(i)->stopAllActions();
	auto menuSize = getContentSize();
	for (int i = 0; i < _items.size(); i++){
		_items.at(i)->setZOrder(-abs((i - _index)*100));
		float x = calcFunction(i - _index,menuSize.width / 2);
		auto moveTo = MoveTo::create(ANIMATION_DURATION,Vec2(menuSize.width / 2 + x,menuSize.height / 2));
		_items.at(i)->runAction(moveTo);
		auto scaleTo = ScaleTo::create(ANIMATION_DURATION,(1 - abs(calcFunction(i - _index,MENU_SCALE))));
		_items.at(i)->runAction(scaleTo);
		auto orbit1 = OrbitCamera::create(ANIMATION_DURATION,calcFunction(i - _index,MENU_ASLOPE) - calcFunction(i - _lastIndex,0);
		_items.at(i)->runAction(orbit1);
	}
	scheduleOnce(schedule_selector(LOLMenu::actionEndCallBack),ANIMATION_DURATION);
	return;
}
void LOLMenu::reset(){
	_lastIndex = 0;
	_index = 0;
}
void LOLMenu::setIndex(int index){
	_lastIndex = _index;
	this->_index = index;
}
float LOLMenu::getIndex(){
	return _index;
}



MenuItem * LOLMenu::getCurrentItem(){
	if (_items.size() == 0)
		return nullptr;
	return _items.at(_index);
}


bool LOLMenu::onTouchBegan(Touch* touch,Event* event){
	//先停止所有可能存在的动作
	for (int i = 0; i < _items.size(); i++)
		_items.at(i)->stopAllActions();
	if (_selectedItem)
		_selectedItem->unselected();
	auto position = this->convertToNodeSpace(touch->getLocation());
	auto size = this->getContentSize();
	auto rect = Rect(0,size.width,size.height);
	if (rect.containsPoint(position)){
		return true;
	}
	return false;
}
void LOLMenu::onTouchEnded(Touch* touch,Event* event){
	auto size = getContentSize();
	auto xDelta = touch->getLocation().x - touch->getStartLocation().x;
	rectify(xDelta>0);
	if (abs(xDelta)<size.width / 24 && _selectedItem)
		_selectedItem->activate();
	updatePositionWithAnimation();
	return;
}
void LOLMenu::onTouchMoved(Touch* touch,Event* event){
	auto xDelta = touch->getDelta().x;
	auto size = getContentSize();
	_lastIndex = _index;
	_index -= xDelta / (size.width *ITEM_SIZE_SCALE);
	updatePosition();
	return;
}

void LOLMenu::rectify(bool forward){
	auto index = getIndex();
	if (index < 0)
		index = 0;
	if (index>_items.size() - 1)
		index = _items.size() - 1;
	if (forward){
		index = (int)(index + 0.4);
	}
	else
		index = (int)(index + 0.6);
	setIndex((int)index);
}

void LOLMenu::actionEndCallBack(float dx){
	_selectedItem = getCurrentItem();
	if (_selectedItem)
		_selectedItem->selected();
}

float LOLMenu::calcFunction(float index,float width){
	return width*index / (abs(index) + CALC_A);
}

演示代码

#ifndef __LOLMenu_SCENE_H__
#define __LOLMenu_SCENE_H__
#include "cocos2d.h"
class LOLMenuDemo : public cocos2d::Layer
{
public:
	// there's no 'id' in cpp,so we recommend returning the class instance pointer
	static cocos2d::Scene* createScene();
	// Here's a difference. Method 'init' in cocos2d-x returns bool,instead of returning 'id' in cocos2d-iphone
	virtual bool init();
	// a selector callback
	void menuCloseCallback(cocos2d::Ref* pSender);
	void menuItem1Callback(cocos2d::Ref* pSender);
	void menuItem2Callback(cocos2d::Ref* pSender);
	void menuItem3Callback(cocos2d::Ref* pSender);
	void menuItem4Callback(cocos2d::Ref* pSender);
	void menuItem5Callback(cocos2d::Ref* pSender);
	void hideAllSprite();
	cocos2d::Sprite *sprite[5];
	// implement the "static create()" method manually
	CREATE_FUNC(LOLMenuDemo);
};
#endif // __HELLOWORLD_SCENE_H__

LOLMenuDemo.cpp

#include "LOLMenuDemo.h"
#include "LOLMenu.h"


USING_NS_CC;

Scene* LOLMenuDemo::createScene()
{
	// 'scene' is an autorelease object
	auto scene = Scene::create();

	// 'layer' is an autorelease object
	auto layer = LOLMenuDemo::create();

	// add layer as a child to scene
	scene->addChild(layer);

	// return the scene
	return scene;
}

// on "init" you need to initialize your instance
bool LOLMenuDemo::init()
{
	//////////////////////////////
	// 1. super init first
	if (!Layer::init())
	{
		return false;
	}

	Size visibleSize = Director::getInstance()->getVisibleSize();
	Vec2 origin = Director::getInstance()->getVisibleOrigin();

	auto item1 = MenuItemImage::create("4_LOL_MENU/item1_0.png","4_LOL_MENU/item1_0.png",CC_CALLBACK_1(LOLMenuDemo::menuItem1Callback,this));
	auto item2 = MenuItemImage::create("4_LOL_MENU/item2_0.png","4_LOL_MENU/item2_0.png",CC_CALLBACK_1(LOLMenuDemo::menuItem2Callback,this));
	auto item3 = MenuItemImage::create("4_LOL_MENU/item3_0.png","4_LOL_MENU/item3_0.png",CC_CALLBACK_1(LOLMenuDemo::menuItem3Callback,this));
	auto item4 = MenuItemImage::create("4_LOL_MENU/item4_0.png","4_LOL_MENU/item4_0.png",CC_CALLBACK_1(LOLMenuDemo::menuItem4Callback,this));
	auto item5 = MenuItemImage::create("4_LOL_MENU/item5_0.png","4_LOL_MENU/item5_0.png",CC_CALLBACK_1(LOLMenuDemo::menuItem5Callback,this));

	LOLMenu *menu = LOLMenu::create();

	menu->addMenuItem(item1);
	menu->addMenuItem(item2);
	menu->addMenuItem(item3);
	menu->addMenuItem(item4);
	menu->addMenuItem(item5);

	menu->setPosition(visibleSize / 2);
	this->addChild(menu,2);


	for (int i = 0; i < 5; i++){
		char str[100];
		sprintf(str,"4_LOL_MENU/item%d.jpg",i + 1);
		sprite[i] = Sprite::create(str);
		sprite[i]->setAnchorPoint(Vec2(0.5f,0.5f));
		sprite[i]->setPosition(visibleSize / 2);
		this->addChild(sprite[i]);
	}
	hideAllSprite();
	return true;
}


void LOLMenuDemo::menuCloseCallback(Ref* pSender)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
	MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
	return;
#endif

	Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
	exit(0);
#endif
}

void LOLMenuDemo::menuItem1Callback(cocos2d::Ref* pSender){
	hideAllSprite();
	sprite[0]->setVisible(true);
}
void LOLMenuDemo::menuItem2Callback(cocos2d::Ref* pSender){
	hideAllSprite();
	sprite[1]->setVisible(true);
}
void LOLMenuDemo::menuItem3Callback(cocos2d::Ref* pSender){
	hideAllSprite();
	sprite[2]->setVisible(true);
}
void LOLMenuDemo::menuItem4Callback(cocos2d::Ref* pSender){
	hideAllSprite();
	sprite[3]->setVisible(true);
}
void LOLMenuDemo::menuItem5Callback(cocos2d::Ref* pSender){
	hideAllSprite();
	sprite[4]->setVisible(true);
}

void LOLMenuDemo::hideAllSprite(){
	for (auto p : sprite){
		if (p->isVisible())
			p->setVisible(false);
	}
}