加速减速的例子

////  Created by cuijiahao on 13-9-25.////#ifndef __Mafia__FanStageLayer__#define __Mafia__FanStageLayer__#include "cocos2d.h"#include "cocos-ext.h"#include <vector>USING_NS_CC;USING_NS_CC_EXT;using namespace std;#include "../LayerStage.h"class FanStageLayer  : public LayerStage{public:FanStageLayer();~FanStageLayer();virtual bool init();cocos2d::CCNode* initFanStageLayer();CREATE_FUNC(FanStageLayer);void HairUpdate(float fElapsedTime);//头发动画的更新void update(float fElapsedTime);void initArmature();void loadResource();void StageRun(float fElapsedTime);bool ccTouchBegan(CCTouch* touch, CCEvent* event);void ccTouchMoved(CCTouch* touch, CCEvent* event);void ccTouchEnded(CCTouch* touch, CCEvent* event);float Distance(CCPoint start, CCPoint end);//求两点间的距离protected:private:CCNode *m_SceneNode;//场景节点CCNode *m_FanBlade;//扇叶节点CCNode *m_LastHead;//末尾人物表情CCNode *  m_Head;//人物初始表情CCSprite *m_PeoHair;//头发精灵CCSizem_SceneSize;//屏幕大小CCRect m_rCollideArea;//碰撞区CCArmature * m_FanArmature;//风扇动画CCArmature * m_HairArmature;//头发动画floatm_fFanStartSpeed;//风扇初速度floatm_fFanAddSpeed;//风扇加速度floatm_fFanEndSpeed;//风扇末速度floatm_fHairStartSpeed;//头发初速度floatm_fHairAddSpeed;//头发加速度floatm_fHairEndSpeed;//头发末速度bool  m_bFanDir;//风扇转向（true为正转）boolm_bTouchEnded;//手指抬起vector<CCPoint> m_vecPoint;//滑动点容器private:enum MyFanStageLayerEnum{BackGround_UP = 10001,//上边的背景BackGround_Bottom,//下边的背景Head,//头部Hair,//头发FanBlade,//风扇叶LastHead};};#endif /* defined(__DotaHero__ShopLayer__) */

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#include "FanStageLayer.h"#include "../../Common/Toolbox.h"FanStageLayer::FanStageLayer():m_SceneNode(NULL),m_FanArmature(NULL),m_HairArmature(NULL),m_fFanStartSpeed(0.0f),m_fFanAddSpeed(0.0f),m_fFanEndSpeed(0.0f),m_bTouchEnded(false),m_PeoHair(NULL),m_fHairStartSpeed(0),m_fHairAddSpeed(0),m_fHairEndSpeed(0),m_bFanDir(true){}FanStageLayer::~FanStageLayer(){m_SceneNode->removeFromParentAndCleanup(true);this->removeFromParentAndCleanup(true);}bool FanStageLayer::init() {bool bRet = false;do {this->initFanStageLayer();bRet = true;} while (0);return bRet;}cocos2d::CCNode* FanStageLayer::initFanStageLayer(){initLayerStage();//初始父类的参数//-----------------------------------------------------------------------------//屏幕区域m_SceneSize = CCDirector::sharedDirector()->getWinSize();//开启单点触摸setTouchEnabled(true);//开启更新函数scheduleUpdate();//设置碰撞区m_rCollideArea = CCRect(0,0, m_SceneSize.width, m_SceneSize.height*620/960);//加载场景m_SceneNode = CCSSceneReader::sharedSceneReader()->createNodeWithSceneFile("CocoStudio/FanStage/Scene/FanStage.json");this->addChild(m_SceneNode,0);//Size visibleSize = Director::getInstance()->getVisibleSize();//获取场景中的风扇叶m_FanBlade = m_SceneNode->getChildByTag(FanBlade);//m_FanBlade->setVisible(false);//获取人物初始表情m_Head = m_SceneNode->getChildByTag(Head);//获取场景中的末尾人物表情m_LastHead = m_SceneNode->getChildByTag(LastHead);m_LastHead->setVisible(false);//获取场景中的头发m_PeoHair = CCSprite::create("Image/Stage/FanStage/hair.png");m_PeoHair->setPosition(ccp(m_SceneSize.width*220/640 , m_SceneSize.height*795/960));//设置当前图片的位置m_PeoHair->setScale(0.65f);m_PeoHair->setAnchorPoint(CCPoint(0,0));//m_PeoHair->setVisible(false);this->addChild(m_PeoHair,2);//加载动画 initArmature();initedLayerStage();//m_bIsTimeStage=false;return NULL;}bool FanStageLayer::ccTouchBegan(CCTouch* touch, CCEvent* event){m_vecPoint.clear();//清除滑动点return true;}void FanStageLayer::ccTouchMoved(CCTouch* touch, CCEvent* event){//如果手指滑动是在规定的范围之内，则压栈if (m_rCollideArea.containsPoint(convertTouchToNodeSpaceAR(touch)))m_vecPoint.push_back(convertTouchToNodeSpaceAR(touch));//添加滑动点}void FanStageLayer::ccTouchEnded(CCTouch* touch, CCEvent* event){m_bTouchEnded = true;//CCLOG("Paddle::onTouchBegan id = %d, x = %f, y = %f", pTouch->getID(), pTouch->getLocation().x, pTouch->getLocation().y);}void FanStageLayer::update( float fElapsedTime ){updateStage(fElapsedTime);}float FanStageLayer::Distance( CCPoint start, CCPoint end ){float length = ccpDistance(start, end);//float length =sqrt(pow(abs(start.x-end.x),2)+pow(abs(start.y-end.y),2));return length;}void FanStageLayer::initArmature(){//加载风扇动画++m_usRscTotalNum;CCArmatureDataManager::sharedArmatureDataManager()->addArmatureFileInfoAsync("CocoStudio/FanStage/LastFan/LastFan.ExportJson",this,schedule_selector(FanStageLayer::loading_callback));//加载头发被吹走的动画++m_usRscTotalNum;CCArmatureDataManager::sharedArmatureDataManager()->addArmatureFileInfoAsync("CocoStudio/FanStage/LastHair/LastHair.ExportJson",this,schedule_selector(FanStageLayer::loading_callback));}void FanStageLayer::loadResource(){m_FanArmature = CCArmature::create("LastFan");m_FanArmature->getAnimation()->playByIndex(0);m_FanArmature->setPosition(ccp(m_SceneSize.width*323/640 , m_SceneSize.height*362/960));m_FanArmature->setVisible(false);m_FanArmature->setColor( ccc3( 230,172,98));this->addChild(m_FanArmature,5);m_HairArmature = CCArmature::create("LastHair");m_HairArmature->getAnimation()->playByIndex(0);m_HairArmature->setPosition(ccp(m_SceneSize.width*90/640 , m_SceneSize.height*795/960));m_HairArmature->setVisible(false);this->addChild(m_HairArmature,5);StageStateSet(SSOpen);}void FanStageLayer::StageRun(float fElapsedTime){if (m_bTouchEnded && m_vecPoint.size()>=3)//如果手刚刚指抬起，则计算加速度{m_bFanDir = CToolbox::IsClockwise(m_FanBlade->getPosition(),m_vecPoint[m_vecPoint.size()-2],m_vecPoint[m_vecPoint.size()-1]);//求方向////求风扇的转向//FanDirection( m_vecPoint[m_vecPoint.size()-2],m_vecPoint[m_vecPoint.size()-1]);//风扇点到直线的垂线距离//float fNearest=GetNearestDistance(m_vecPoint[0],m_vecPoint[m_vecPoint.size()-1],m_FanBlade->getPosition());float fNearest = CToolbox::GetDistanceForDotToLine(m_FanBlade->getPosition(),m_vecPoint[0],m_vecPoint[m_vecPoint.size()-1]);//求系数 150是风扇的半径fNearest /= 150;if (fNearest > 1)fNearest = 1;//求扇叶的加速度m_fFanAddSpeed += (Distance(m_vecPoint[m_vecPoint.size()-1],m_vecPoint[m_vecPoint.size()-2]) + Distance(m_vecPoint[m_vecPoint.size()-2],m_vecPoint[m_vecPoint.size()-3]))*4.0f *fNearest;//加速度=距离*系数//设置手指离开触点为假m_bTouchEnded = false;//设置头发的加速度m_fHairAddSpeed = m_fFanAddSpeed*2.0f;//头发的速度=扇叶的速度*系数}else//------------------计算风扇阻力，减少加速度{//------------------------扇叶的阻力if (m_fFanAddSpeed>0)m_fFanAddSpeed -= m_fFanAddSpeed * fElapsedTime*0.2f;//阻力=加速度 - 速度 * 时间elsem_fFanAddSpeed = 0;//----------------头发的阻力if (m_fHairAddSpeed>0)m_fHairAddSpeed -= m_fHairAddSpeed * fElapsedTime*0.8/*(1.0f/m_fFanAddSpeed*100)*/;//阻力=加速度 - 速度 * 时间*系数elsem_fHairAddSpeed = 0;}//----------------加速度-------------------m_fHairEndSpeed = m_fHairStartSpeed + m_fHairAddSpeed;//头发的末速度=初速度+加速度if (m_bFanDir)//如果风扇转向为正向{m_fFanEndSpeed += m_fFanStartSpeed + m_fFanAddSpeed * fElapsedTime;//扇叶的末速度=初速度+加速度*时间m_fFanEndSpeed++;}else//如果是反向{m_fFanEndSpeed -= m_fFanStartSpeed + m_fFanAddSpeed * fElapsedTime;//扇叶的末速度=初速度+加速度*时间m_fFanEndSpeed--;}if (m_fHairEndSpeed<1600)m_fHairEndSpeed = m_fHairEndSpeed/10;//头发的角度=头发的速度/10elsem_fHairEndSpeed = 160;//如果头发的角度大于180度则让它等于180度m_PeoHair->setRotation(-m_fHairEndSpeed);//头发的旋转m_FanBlade->setRotation(m_fFanEndSpeed);//风扇的旋转//CCLOG("%f,%f",m_fFanAddSpeed,m_fHairEndSpeed);if (m_fHairEndSpeed>=160)//如果风扇的加速度大于系数则停止更新，并调用头发的更新函数{StageStateSet(SSComplete);m_FanBlade->setVisible(false);m_FanArmature->setVisible(true);this->schedule(schedule_selector(FanStageLayer::HairUpdate),0.4f);}}void FanStageLayer::HairUpdate( float fElapsedTime ){m_PeoHair->setVisible(false);m_HairArmature->setVisible(true);m_LastHead->setVisible(true);m_Head->setVisible(false);this->unschedule(schedule_selector(FanStageLayer::HairUpdate));}