7.cocos精灵创建和绘制

1. 创建Layer层的类
   1. 　　T2LayerSprite.h

       #pragma once
      
       #include "cocos2d.h"
      
       USING_NS_CC;
      
       class T2LayerSprite:public CCLayer
      
       {
      
       public:
      
           static CCScene * scene();
      
           CREATE_FUNC(T2LayerSprite);
      
           bool init();
      
       };

红色代码处是一个宏定义:

 #define CREATE_FUNC(__TYPE__) \

 static __TYPE__* create() \

 { \

     __TYPE__ *pRet = new(std::nothrow) __TYPE__(); \

     if (pRet && pRet->init()) \

     { \

         pRet->autorelease(); \

         return pRet; \

     } \

     else \

     { \

         delete pRet; \

         pRet = nullptr; \

         return nullptr; \

     } \

 }

等同于:

static T1LayerAnchorPoint*create();

 T1LayerAnchorPoint*T1LayerAnchorPoint::create()

 {

     T1LayerAnchorPoint *pRet = new T1LayerAnchorPoint();

     if (pRet && pRet->init())

     {

         pRet->autorelease();

     }

     else

     {

         delete pRet;

         pRet = NULL;

     }

     return pRet;

 }

调用顺序:scene->create->init->scene

　　　　2.T2LayerSprite.cpp

 #include "T2LayerSprite.h"

 CCScene * T2LayerSprite::scene()

 {

     CCScene *scene = CCScene::create();

     T2LayerSprite *layer = T2LayerSprite::create();

     scene->addChild(layer);

     return scene;

 }

 bool  T2LayerSprite::init()

 {

     CCLayer::init();

     //加载背景

     //获取背景资源,并设置大小

     CCSprite *bg = CCSprite::create("spirit/background.jpg",CCRectMake(,,,));

     //获取屏幕大小

     auto winSize = CCDirector::sharedDirector()->getWinSize();

     //设置锚点

     bg->setAnchorPoint(ccp(, ));

     //设置位置

     bg->setPosition(ccp(,));

     //添加背景资源

     addChild(bg);

     //加载图片

     CCImage *image = new CCImage();

     //图片初始化

     image->initWithImageFile("spirit/plant.png");

     //创建2D纹理

     CCTexture2D *texture = new CCTexture2D();

     //纹理自动释放

     texture->autorelease();

     //纹理用图片初始化

     texture->initWithImage(image);

     //用纹理创建精灵

     CCSprite *plant = CCSprite::createWithTexture(texture);//纹理

     //设置位置

     plant->setPosition(ccp(,winSize.height/));

     //添加图片

     addChild(plant);

     //加载一张大图在缓存里

     //创建纹理

     CCTexture2D *texture2 = CCTextureCache::sharedTextureCache()->addImage("spirit/bullet.png");

     //用纹理初始化精灵

     CCSprite *bullet = CCSprite::createWithTexture(texture2);

     //设置位置

     bullet->setPosition(ccp(, winSize.height /  + ));

     //添加

     addChild(bullet);

     //加载一组帧

     CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("spirit/zombie.plist");

     //此方法是先获取帧再加载

     //CCSpriteFrame *sf = CCSpriteFrameCache::sharedSpriteFrameCache()->spriteFrameByName("z_1_attack_03.png");

     //CCSprite* zombie = CCSprite::createWithSpriteFrame(sf);

     //此方法是直接通过名字加载

     CCSprite *zombie = CCSprite::createWithSpriteFrameName("z_1_attack_03.png");

     //设置位置

     zombie->setPosition(ccp(, winSize.height / ));

     //添加

     addChild(zombie);

     //创建动作

     CCJumpBy *by = CCJumpBy::create(, ccp(, ), , );

     //zombie精灵设置跳跃动作

     zombie->runAction(CCRepeatForever::create(by));

     //获取单个帧

     CCSpriteFrame *frame = CCSpriteFrame::create("spirit/p_1_01.png", CCRectMake(, , , ));

     //通过帧初始化精灵

     CCSprite *sun = CCSprite::createWithSpriteFrame(frame);

     //设置位置

     sun->setPosition(, winSize.height /  + );

     //添加

     addChild(sun);

     return true;

 }

运行截图: