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: