转载请说明出处:http://www.jb51.cc/article/p-sirftvig-bas.html
github地址:https://github.com/teffy/cocos2dx
这几天接着看了一下场景切换的效果TransitionScene,而cocos也在系统中提供了很多种不同的切换效果,那么我们先看一下TransitionScene的类继承关系图:
每一个类在cocos2d的官网文档中有说明
而且在官方demo的cpp-test中也有demo,我也跟着写了一遍
首先是要理解一下一些宏定义
- #define STRINGIFY(x) #x
- #define TRANS(__classname__){\//根据传入的类名构造一个结构体,结构体内有一个function和一个name,类似于java中XXX.class经过反射可以拿到很多东西
- [](float t,Scene* s){ return __classname__::create(t,s);},\
- STRINGIFY(__classname__),\
- }
- struct transitions{//结构体
- std::function<TransitionScene*(float t,Scene* s)> function;
- const char* name;
- }transitions[] = {//结构体数组,用来保存定义的类的create方法和name
- TRANS(MTransitionCrossFade),TRANS(MTransitionFade),TRANS(MTransitionFadeTR),TRANS(MTransitionFadeBL),TRANS(MTransitionFadeDown),TRANS(MTransitionFadeUp),TRANS(MTransitionJumpZoom),TRANS(MTransitionFlipAngular_DOWN),TRANS(MTransitionFlipAngular_LEFT),TRANS(MTransitionFlipAngular_RIGHT),TRANS(MTransitionFlipAngular_UP),TRANS(MTransitionFlipX_DOWN),TRANS(MTransitionFlipX_LEFT),TRANS(MTransitionFlipX_RIGHT),TRANS(MTransitionFlipX_UP),TRANS(MTransitionFlipY_DOWN),TRANS(MTransitionFlipY_LEFT),TRANS(MTransitionFlipY_RIGHT),TRANS(MTransitionFlipY_UP),TRANS(MTransitionZoomFlipAngular),TRANS(MTransitionZoomFlipX_DOWN),TRANS(MTransitionZoomFlipX_LEFT),TRANS(MTransitionZoomFlipX_RIGHT),TRANS(MTransitionZoomFlipX_UP),TRANS(MTransitionZoomFlipY_DOWN),TRANS(MTransitionZoomFlipY_LEFT),TRANS(MTransitionZoomFlipY_RIGHT),TRANS(MTransitionZoomFlipY_UP),TRANS(MTransitionShrinkGrow),TRANS(MTransitionSlideInL),TRANS(MTransitionSlideInB),TRANS(MTransitionSlideInR),TRANS(MTransitionSplitCols),TRANS(MTransitionSplitRows),TRANS(MTransitionTurnOffTiles),};
- #define MAX_TRANSITION_COUNT (sizeof(transitions)/sizeof(transitions[0]))
然后就是每一个切换效果的类,例举一个
- TransitionScene* createTranstion(int _index,float t,Scene* s){
- //Director::getInstance()->setDepthTest(false);
- return transitions[_index].function(t,s);
- }
为了可以来回切换着看这些效果,通过向MainScene中添加不同的layer,每一个layer中有三个按钮,点击按钮的时候,然后构造一个切换效果Scene,进行切换场景,具体看code
- class MTransitionTurnOffTiles : TransitionTurnOffTiles{
- public:
- static TransitionScene* create(float duration,Scene* scene){
- return TransitionTurnOffTiles::create(duration,scene);
- }
- };
另外一个LayerTwo也是类似,只不过背景图片不同
- LayerOne::LayerOne(){
- init();
- }
- LayerOne::~LayerOne(){}
- bool LayerOne::init(){
- if (!Layer::init()) {
- return false;
- }
- Size visibleSize = Director::getInstance()->getVisibleSize();
- Vec2 origin = Director::getInstance()->getVisibleOrigin();
- MenuItemImage* restart = MenuItemImage::create("res/r1.png","res/r2.png",CC_CALLBACK_1(LayerOne::menuRestartCallback,this));
- restart->setPosition(Vec2(visibleSize.width / 2,restart->getContentSize().height));
- MenuItemImage* back = MenuItemImage::create("res/b1.png","res/b2.png",CC_CALLBACK_1(LayerOne::menuBackCallback,this));
- back->setPosition(Vec2(visibleSize.width / 2 - restart->getContentSize().width*1.5,back->getContentSize().height));
- MenuItemImage* forward = MenuItemImage::create("res/f1.png","res/f2.png",CC_CALLBACK_1(LayerOne::menuForwardCallback,this));
- forward->setPosition(Vec2(visibleSize.width / 2 + restart->getContentSize().width*1.5,forward->getContentSize().height));
- auto menu = Menu::create(restart,back,forward,NULL);
- menu->setPosition(Vec2::ZERO);
- this->addChild(menu,1);
- auto label = Label::createWithTTF("LayerOne","fonts/Marker Felt.ttf",24);
- label->setPosition(Vec2(origin.x + visibleSize.width / 2,origin.y + visibleSize.height - label->getContentSize().height));
- this->addChild(label,1);
- auto transitionName = Label::createWithTTF(transitions[transition_index].name,24);
- transitionName->setPosition(Vec2(origin.x + visibleSize.width / 2,origin.y + visibleSize.height - transitionName->getContentSize().height * 2));
- this->addChild(transitionName,1);
- auto sprite = Sprite::create("res/background1.png");
- sprite->setPosition(Vec2(visibleSize.width / 2 + origin.x,visibleSize.height / 2 + origin.y));
- this->addChild(sprite,0);
- return true;
- }
- void LayerOne::menuRestartCallback(Ref* pSender){
- auto go = MainScene::createScene();
- Director::getInstance()->replaceScene(go);
- }
- void LayerOne::menuBackCallback(Ref* pSender){
- transition_index--;
- if (transition_index < 0){
- transition_index += MAX_TRANSITION_COUNT;
- }
- Scene* s = MainScene::createScene();
- Layer* layer2 = new LayerTwo();
- s->addChild(layer2);
- auto scene = createTranstion(transition_index,DURATION,s);
- if (scene){
- Director::getInstance()->replaceScene(scene);
- }
- }
- void LayerOne::menuForwardCallback(Ref* pSender){
- transition_index++;
- transition_index = transition_index % MAX_TRANSITION_COUNT;
- Scene* s = MainScene::createScene();
- Layer* layer2 = new LayerTwo();
- s->addChild(layer2);
- auto scene = createTranstion(transition_index,s);
- if (scene){
- Director::getInstance()->replaceScene(scene);
- }
- }
win上可以运行,Android下,我刚开始不能run as,会报一些宏定义的错误,但是用命令编译过之后就好了
android下效果图:
(后面发现少了点,我补充下)