首页 > 代码库 > cocos2d-x v3.2 FlappyBird 各个类对象具体代码分析(4)
cocos2d-x v3.2 FlappyBird 各个类对象具体代码分析(4)
今天要讲的使我们猪脚类
SpriteBird.h
SpriteBird.cpp
猪脚类要注意的是三种状态的切换,和单点触控侦听的设置,还有就是小鸟在飞行的过程中,头部会上下的摆动,物理模型这里就不说了,小鸟头部的摆动是靠小鸟Y轴的速度来判定的,当小鸟向上飞的时候,速度是正的,所以头部摆动的旋转角度也是向上,当小鸟下落的时候,速度是负的,所以头部摆动的旋转角度是向下的。
小鸟的三种状态:
下面是代码
//SpriteBird.h #pragma once #include "cocos2d.h" //小鸟的三种状态 typedef enum ActionState { ACTION_STATE_IDLE, //空闲状态 ACTION_STATE_FLY, //飞行状态 ACTION_STATE_DIE //死亡状态 }; class SpriteBird:public cocos2d::Layer { public: SpriteBird(); ~SpriteBird(); static SpriteBird * createBird(); //状态转换函数 void changeState(ActionState); //转换成空闲状态 void stateIdle(); //转换成飞行状态 void stateFly(); //转换成死亡状态 void stateDie(); bool init(); void update(float); CREATE_FUNC(SpriteBird); private: //小鸟精灵 cocos2d::Sprite * sprite_bird; //当前状态 ActionState bird_state; //侦听对象 cocos2d::EventListenerTouchOneByOne * listener; };
//SpriteBird.cpp #include "SpriteBird.h" #include "define.h" USING_NS_CC; SpriteBird::SpriteBird() { } SpriteBird::~SpriteBird() { } bool SpriteBird::init() { if (!Layer::init()) { return false; } auto origin=Director::getInstance()->getVisibleOrigin(); auto visibleSize=Director::getInstance()->getVisibleSize(); Animate * animate; //下面是随即产生三种小鸟(红色,黄色,蓝色),并实例对应的飞行动画 switch (int temp=int(rand()%3+1)) { case 1: { sprite_bird=Sprite::createWithSpriteFrameName("bird0_0.png"); animate=Animate::create(AnimationCache::getInstance()->getAnimation(BIRDANIMATION_0)); sprite_bird->runAction(RepeatForever::create(animate)); break; }; case 2: { sprite_bird=Sprite::createWithSpriteFrameName("bird1_0.png"); animate=Animate::create(AnimationCache::getInstance()->getAnimation(BIRDANIMATION_1)); sprite_bird->runAction(RepeatForever::create(animate)); break; }; case 3: { sprite_bird=Sprite::createWithSpriteFrameName("bird2_0.png"); animate=Animate::create(AnimationCache::getInstance()->getAnimation(BIRDANIMATION_2)); sprite_bird->runAction(RepeatForever::create(animate)); break; }; default: { log("bird:%d",temp); break; } } //这里是小鸟的物理模型,这里不多讲了,具体看上一章 PhysicsBody * body=PhysicsBody::create(); //小鸟的刚体是个圆 body->addShape(PhysicsShapeCircle::create(BIRD_RADIUS)); body->setDynamic(true); body->setLinearDamping(0.7f); body->setGravityEnable(false); body->setCategoryBitmask(1); body->setCollisionBitmask(-1); body->setContactTestBitmask(-1); sprite_bird->setPhysicsBody(body); sprite_bird->setPosition(Point(origin.x+visibleSize.width/2,origin.y+visibleSize.height*0.6)); this->addChild(sprite_bird); //下面是小鸟的点击侦听,listener是单点触控 //每次点击小鸟都会向上(Y轴)飞一段距离 //这里我们就给它赋值一个初速度(Y轴) listener=EventListenerTouchOneByOne::create(); //设置触控是否向下传递 listener->setSwallowTouches(false); //点击开始(单点触控一般分为三种状态,触控开始(onTouchBegan),移动(onTouchMove),触控结束(onTouchEnd)) //这里只用到了触控开始和结束 listener->onTouchBegan=[=](Touch * t,Event *e) { //触控开始时什么都不做 //注意这里要有返回值(bool) log("touch begin"); return true; }; listener->onTouchEnded=[=](Touch *t,Event *e) { //触控结束时,播放音效 CocosDenshion::SimpleAudioEngine::getInstance()->playEffect("sounds/sfx_wing.mp3"); //给小鸟一个初速度 sprite_bird->getPhysicsBody()->setVelocity(VELOCITY); //注意这边没有返回值 }; //这里开了个定时器,防止小鸟飞出边界,和小鸟头部旋转角度设置 this->scheduleUpdate(); return true; } //创造小鸟对象 SpriteBird * SpriteBird::createBird() { SpriteBird * temp=new SpriteBird(); temp->init(); return temp; } //小鸟三种状态的切换 void SpriteBird::changeState( ActionState as) { switch (as) { case ACTION_STATE_IDLE: stateIdle(); break; case ACTION_STATE_FLY: stateFly(); break; case ACTION_STATE_DIE: stateDie(); break; default: break; } } //切换到空闲状态 //1:把小鸟添加到点击侦听中去 //2:小鸟移除重力感应(因为在这个状态下,小鸟是悬停在空中的) void SpriteBird::stateIdle() { _eventDispatcher->addEventListenerWithSceneGraphPriority(listener,sprite_bird); sprite_bird->getPhysicsBody()->setGravityEnable(false); } //切换到飞行状态 //设置重力感应 void SpriteBird::stateFly() { sprite_bird->getPhysicsBody()->setGravityEnable(true); } //切换到死亡状态 void SpriteBird::stateDie() { //播放音效 CocosDenshion::SimpleAudioEngine::getInstance()->playEffect("sounds/sfx_die.mp3"); //关闭定时器 this->unscheduleUpdate(); //移除点击侦听 _eventDispatcher->removeEventListener(listener); //开启重力感应(因为死亡后会自由落体.....) sprite_bird->getPhysicsBody()->setGravityEnable(true); //停止小鸟的所有动画 sprite_bird->stopAllActions(); //设置角度,头向下... sprite_bird->setRotation(BIRD_DIE_ROTATION); } void SpriteBird::update( float ) { auto origin=Director::getInstance()->getVisibleOrigin(); auto visibleSize=Director::getInstance()->getVisibleSize(); //防止飞出边界 if (sprite_bird->getPositionY()>(origin.y+visibleSize.height)) { sprite_bird->setPositionY(origin.y+visibleSize.height); } //小鸟的飞行头部的角度,根据飞行的Y轴速度决定 sprite_bird->setRotation(sprite_bird->getPhysicsBody()->getVelocity().y*-0.1); }结束
cocos2d-x v3.2 FlappyBird 各个类对象具体代码分析(4)
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