第八章动作和动画-动画

Cocos2d-x学习笔记

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动画又可以分为场景过渡动画和帧动画。

帧动画

帧动画就是按照一定时间间隔、一定的顺序、一帧一帧地显示图片。在Cocos2d-x中播放帧动画设计两个类：Animate和Animation。Animation是动画类，它保存很多动画帧，Animate类是动作类继承于ActionInterval类，属于间隔动作类，它的作用是将Animateion定义的动画转换成动作进行执行。

实例

HelloWorld.h文件

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

class HelloWorld : public cocos2d::Layer
{
    bool isPlaying;//播放标识,ture说明正在播放,false说明停止播放
    cocos2d::Sprite * sprite;
public:
    static cocos2d::Scene* createScene();

    virtual bool init();

    // a selector callback
    void onAction(cocos2d::Ref * pSender);

    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
};

#endif // __HELLOWORLD_SCENE_H__

HelloWorld.cpp文件

#include "HelloWorldScene.h"

USING_NS_CC;

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

    // 'layer' is an autorelease object
    auto layer = HelloWorld::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 HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }

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

    SpriteFrameCache::getInstance()->addSpriteFramesWithFile("run.plist");

    auto background = Sprite::createWithSpriteFrameName("background.png");
    background->setAnchorPoint(Vec2::ZERO);
    this->addChild(background, 0);

    sprite = Sprite::createWithSpriteFrameName("h1.png");
    sprite->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 2));
    this->addChild(sprite);

    isPlaying = false;

    //toggle菜单
    auto goSprite = Sprite::createWithSpriteFrameName("go.png");
    auto stopSprite = Sprite::createWithSpriteFrameName("stop.png");
    auto goToggleMenuItem = MenuItemSprite::create(goSprite, goSprite);
    auto stopToggleMenuItem = MenuItemSprite::create(stopSprite, stopSprite);
    auto toggleMenuItem = MenuItemToggle::createWithCallback(CC_CALLBACK_1(HelloWorld::onAction, this), goToggleMenuItem, stopToggleMenuItem, NULL);
    toggleMenuItem->setPosition(Director::getInstance()->convertToGL(Vec2(930, 540)));
    auto mn = Menu::create(toggleMenuItem, NULL);
    mn->setPosition(Vec2::ZERO);
    this->addChild(mn);

    return true;
}

void HelloWorld::onAction(Ref * pSender)
{
    if (!isPlaying)
    {
        //动画开始
        Animation * animation = Animation::create();
        //循环将精灵帧加入到animation对象中
        for (int i = 1; i <= 4; i++)
        {
            __String * frameName = __String::createWithFormat("h%d.png", i);
            log("frameName = %s", frameName->getCString());
            SpriteFrame * spriteFrame = SpriteFrameCache::getInstance()->getSpriteFrameByName(frameName->getCString());
            animation->addSpriteFrame(spriteFrame);

            animation->setDelayPerUnit(0.15f);//设置两个帧播放时间
            animation->setRestoreOriginalFrame(true);//动画执行后还原初状态
        }
        Animate * action = Animate::create(animation);
        sprite->runAction(RepeatForever::create(action));
        //动画结束

        isPlaying = true;
    }
    else
    {
        sprite->stopAllActions();
        isPlaying = false;
    }
}