几种抽奖方式之轮盘抽奖

最近做项目使用到了抽奖功能，于是把抽奖模块独立出来了，以便重复利用，资源来自https://www.geek-share.com/detail/2601100880.html。下面直接上代码：

#ifndef __Wheel__CWheelLayer__
#define __Wheel__CWheelLayer__

#include <stdio.h>
#include "cocos2d.h"
#include "../cocos2d/cocos/editor-support/cocostudio/CocoStudio.h"
#include "../cocos2d/cocos/ui/CocosGUI.h"
using namespace cocostudio;
using namespace ui;
USING_NS_CC;

class CWheelLayer:public Layer
{
public:
CWheelLayer();
~CWheelLayer();
bool init();
CREATE_FUNC(CWheelLayer);
static Scene* createScene();
void update(float dt);
private:
Sprite *_wheel;
//转盘状态0静止，1加速，2减速
int _state;
float _speed;
float _speedAcc;
//目标 设置index即为结果
int _index;
float _targetRo;
//控制音效
int _soundCount1;
int _soundCount2;
};

#endif /* defined(__Wheel__CWheelLayer__) */

//
//  CWheelLayer.cpp
//  Wheel
//
//  Created by xujw on 15/6/29.
//
//

#include "CWheelLayer.h"
#include "CSoundTools.h"

CWheelLayer::CWheelLayer():_wheel(nullptr)
,_state(0)
,_speed(0)
,_speedAcc(0.05)
,_targetRo(0)
,_index(0)
,_soundCount1(0)
,_soundCount2(0)
{
}
CWheelLayer::~CWheelLayer()
{
}

bool CWheelLayer::init()
{
if (!Layer::init())
{
return false;
}

auto node = CSLoader::createNode("wheel.csb");
this->addChild(node);

auto close = dynamic_cast<Button*>(node->getChildByName("btn_close"));
close->addTouchEventListener([this,close](Ref* tar,Widget::TouchEventType type)
{
if (type == Widget::TouchEventType::ENDED)
{
CCLOG("close...");
Director::getInstance()->popScene();
}
});

_wheel = dynamic_cast<Sprite*>(node->getChildByName("sprite_wheel"));
_wheel->setRotation(12);

auto spin = dynamic_cast<Button*>(node->getChildByName("btn_spin"));
spin->addTouchEventListener([this](Ref* tar,Widget::TouchEventType type)
{
if (type == Widget::TouchEventType::ENDED)
{
if (_state==0)
{
CCLOG("spin...");
_state = 1;
_index = arc4random()%18;
_targetRo = _index*20 + 12 + 360*2;
_speed = 0;
_soundCount1 = 0;
_soundCount2 = 0;
}
}
});

scheduleUpdate();

return true;
}

Scene* CWheelLayer::createScene()
{
auto s = Scene::create();
s->addChild(CWheelLayer::create());
return s;
}

void CWheelLayer::update(float dt)
{
if (_state == 1)
{
auto ro = _wheel->getRotation();
ro += _speed;

if (ro>=360*3)
{
ro = 0;
_state = 2;
_soundCount1 = 0;
}

_wheel -> setRotation(ro);
if (_speed<=8)
{
_speed += _speedAcc;
}

if ((int)ro/18 > _soundCount1)
{
if (_soundCount2>5)
{
_soundCount2 = 0;
_soundCount1 = (int)ro/18;
CSoundTools::playEffect(TURN_TABLE);
}
}
_soundCount2++;
}
else if (_state == 2)
{
auto ro = _wheel->getRotation();
auto spp = (_targetRo - ro)*0.02;
auto finRo = _targetRo - ro;
if (spp>=_speed)
{
spp = _speed;
}
ro += spp;
_wheel->setRotation(ro);
if (spp<=0.02)
{
spp = finRo;
_wheel->setRotation(_targetRo-360*2);
_state = 0;
CSoundTools::playEffect(TURN_TABLE);
MessageBox(StringUtils::format("Now index:%d",_index).c_str(), "Congratulation");
}

if ((int)ro/18 > _soundCount1)
{
if (_soundCount2>5)
{
_soundCount2 = 0;
_soundCount1 = (int)ro/18;
CSoundTools::playEffect(TURN_TABLE);
}
}
_soundCount2++;
}
}

下载链接：https://github.com/sky068/WheelAndCoster