编写MyLayer，2 锚点，3 精灵的创建，4 zorder

Posted 2020-09-25 slgkaifa

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1 编写MyLayer

头文件：MyLayer.h

#include "cocos2d.h" USING_NS_CC;   //代表的是： using namespace cocos2d   （通过F12进行查看）   //继承CCLayer class MyLayer :public CCLayer { public:     //没有构造函数和析构函数     CREATE_FUNC(MyLayer);     /*static MyLayer *create();*/       static CCScene * scene();     bool init(); };

MyLayer.cpp

#include "MyLayer.h"   //MyLayer *MyLayer::create(){ //  MyLayer * pRet = new MyLayer(); //  if (pRet && pRet->init()) //  { //      pRet->autorelease(); //  } //  else //  { //      delete pRet; //      pRet = NULL; //  } //  return pRet; //}   bool MyLayer::init() {     if (!CCLayer::init())     {         return false;     }       CCSize winSize = CCDirector::sharedDirector()->getWinSize();         //创建一个精灵     CCSprite * spr = CCSprite::create("anchor3.png");     spr->setPosition(ccp(winSize.width/2,winSize.height /2));     //加入一个精灵     addChild(spr);       return true; }   CCScene *MyLayer::scene() {     CCScene * scene = CCScene::create();     MyLayer * layer = MyLayer::create();     scene->addChild(layer);     return scene; }

要想让写的Layer可以执行，须要在AppDelegate.app中加入例如以下代码

1、 加入头文件:#include "MyLayer.h" 2、 在bool AppDelegate::applicationDidFinishLaunching() 中改动例如以下内容：   bool AppDelegate::applicationDidFinishLaunching() {     // initialize director     CCDirector* pDirector = CCDirector::sharedDirector();     CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();       pDirector->setOpenGLView(pEGLView);         // turn on display FPS     pDirector->setDisplayStats(true);       // set FPS. the default value is 1.0/60 if you don‘t call this     pDirector->setAnimationInterval(1.0 / 60);       // create a scene. it‘s an autorelease object     //CCScene *pScene = HelloWorld::scene();     CCScene * pScene = MyLayer::scene();             // run     pDirector->runWithScene(pScene);       return true; }

执行结果：

2 锚点

LayerAnchorPoint.h

#ifndef __T01LayerAnchorPoint_H__ #define __T01LayerAnchorPoint_H__   #include "cocos2d.h" USING_NS_CC;   class LayerAnchorPoint:public CCLayer { public:     static LayerAnchorPoint * create();     bool init();       static CCScene * scene();       void draw();       void mySchedule(float dt);     CCSprite *spr; };   #endif

LayerAnchorPoint.cpp

#include "LayerAnchorPoint.h"   CCScene * LayerAnchorPoint::scene() {     //创建一个场景     CCScene * scene = CCScene::create();     LayerAnchorPoint * layer = LayerAnchorPoint::create();     scene->addChild(layer);     return scene; }   LayerAnchorPoint * LayerAnchorPoint::create() {     LayerAnchorPoint *pRet = new LayerAnchorPoint();     if (pRet && pRet->init())     {         pRet->autorelease();     }     else     {         delete pRet;         pRet = NULL;     }     return pRet; }   bool LayerAnchorPoint::init() {     CCLayer::init();         CCSize winSize = CCDirector::sharedDirector()->getWinSize();     spr = CCSprite::create("anchor1.png");     //设置锚点     //spr->setAnchorPoint(ccp(0.656,0.5));     spr->setScale(5.0f);     spr->setPosition(ccp(winSize.width/2,winSize.height/2));     addChild(spr);       //设置一个定时器,频率是2秒     schedule(schedule_selector(LayerAnchorPoint::mySchedule), 2);     return true; }   //通过以下的方法实现画线 void LayerAnchorPoint::draw() {     CCSize winSize = CCDirector::sharedDirector()->getWinSize();     //RGB颜色。当中最后一个參数是透明率     ccDrawColor4B(255,0,0,255);       ccDrawLine(ccp(0, winSize.height / 2), ccp(winSize.width, winSize.height / 2));     ccDrawLine(ccp(winSize.width / 2, 0),ccp(winSize.width/2,winSize.height)); }   //通过以下的方式设置旋转 void LayerAnchorPoint::mySchedule(float dt) {     static float ro = 0;     ro += 30;     spr->setRotation(ro); }

改动：AppDelegate.cpp中的代码

头文件： #include "LayerAnchorPoint.h"   bool AppDelegate::applicationDidFinishLaunching() {     // initialize director     CCDirector* pDirector = CCDirector::sharedDirector();     CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();       pDirector->setOpenGLView(pEGLView);         // turn on display FPS     pDirector->setDisplayStats(true);       // set FPS. the default value is 1.0/60 if you don‘t call this     pDirector->setAnimationInterval(1.0 / 60);       // create a scene. it‘s an autorelease object     //CCScene *pScene = HelloWorld::scene();     //CCScene * pScene = MyLayer::scene();     CCScene * pScene = LayerAnchorPoint::scene();       // run     pDirector->runWithScene(pScene);       return true; }

执行结果：

3 精灵的创建

1、编写：LayerSprite.h

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

编写：表示屏幕大小的头文件AppMacros.h

#ifndef __APPMACROS_H__ #define __APPMACROS_H__   #include "cocos2d.h"   //通过提前定义获得屏幕大小 #define  winSize  CCDirector::sharedDirector()->getWinSize()   #endif /* __APPMACROS_H__ */

编写：LayerSprite.cpp

#include "LayerSprite.h" #include "AppMacros.h"     CCScene *LayerSprite::scene() {     CCScene * scene = CCScene::create();     LayerSprite * layer = LayerSprite::create();     scene->addChild(layer);     return scene; } bool T02LayerSprite::init() {     CCLayer::init();       CCSprite * bg = CCSprite::create("sprite/background.jpg",CCRectMake(0,0,480,320));     bg->setAnchorPoint(ccp(0,0));     bg->setPosition(CCPointZero);     addChild(bg);       CCImage * image = new CCImage();     image->initWithImageFile("sprite/plant.png");       CCTexture2D * texture = new CCTexture2D();     texture->autorelease();     texture->initWithImage(image);     CCSprite * plant = CCSprite::createWithTexture(texture); //纹理     plant->setPosition(ccp(100,winSize.height/2));     addChild(plant);       CCTexture2D * texture2 = CCTextureCache::sharedTextureCache()->addImage("sprite/bullet.png");     CCSprite * bullet = CCSprite::createWithTexture(texture2);     bullet->setPosition(ccp(200, winSize.height / 2+10));     addChild(bullet);       CCSpriteFrameCache::sharedSpriteFrameCache()->addSpriteFramesWithFile("sprite/zombie.plist");     //CCSpriteFrame *sf = CCSpriteFrameCache::sharedSpriteFrameCache()->spriteFrameByName("z_1_attack_01.png");     //CCSprite *zombie = CCSprite::createWithSpriteFrame(sf);     CCSprite *zombie = CCSprite::createWithSpriteFrameName("z_1_attack_01.png");     zombie->setPosition(ccp(400, winSize.height / 2-50));     addChild(zombie);       CCJumpBy * by = CCJumpBy::create(2, ccp(0,0),40,3);     zombie->runAction(CCRepeatForever::create(by));       CCSpriteFrame * frame = CCSpriteFrame::create("sprite/p_1_01.png", CCRectMake(0, 0, 80, 80));     CCSprite * sun = CCSprite::createWithSpriteFrame(frame);     sun->setPosition(ccp(400, winSize.height / 2 + 50));     addChild(sun);       return true; }

同上，将LayerSprite.h加到AppDelegate.cpp中，并加入上： CCScene * pScene = LayerSprite::scene();

执行结果：

4 zorder

LayerZorder.h

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

LayerZorder.cpp

#include "LayerZorder.h" #include "AppMacros.h"   CCScene *LayerZorder::scene() {     CCScene * scene = CCScene::create();     LayerZorder * layer = LayerZorder::create();     scene->addChild(layer);     return scene; }   bool LayerZorder::init() {     CCLayer::init();       CCSprite * man = CCSprite::create("zorder/car42.png");     //将图片缩放     man->setScale(0.3f);     CCSprite * woman = CCSprite::create("zorder/car43.png");     woman->setScale(0.3f);     CCSprite * smallThree = CCSprite::create("zorder/car51.png");     smallThree->setScale(0.3f);       man->setPosition(ccp(winSize.width / 2 + 40, winSize.height / 2 - 30));     smallThree->setPosition(ccp(winSize.width / 2, winSize.height / 2 + 30));     woman->setPosition(ccp(winSize.width / 2 - 40, winSize.height / 2 + 30));       addChild(man);     addChild(smallThree);     addChild(woman);       //通过setZOrder来设置图片显示顺序     man->setZOrder(100);     smallThree->setZOrder(50);     woman->setZOrder(0);     return true;       /*CCLog("%d", man->getZOrder());     CCLog("%d", smallThree->getZOrder());     CCLog("%d", woman->getZOrder());*/     return true; }

改动AppDelegate.cpp 1.  将zorder的头文件进入：#include "LayerZorder.h" 2.  CCScene * pScene = LayerZorder::scene(); 执行结果：