Cocos2d-x中瞬时动作

瞬时动作就是不等待立即执行的动作，瞬时动作的基类是ActionInstant ，具体类图参见cocos2d的文档

我们通过一个实例来学习cocos2d-x中的瞬时动作

首先在HelloWorld.h头文件中添加枚举，用来作为选择的标识

typedef enum ActionTypes

{
PLACE_TAG = 102,
FLIPX_TAG,
FLIPY_TAG,
HIDE_SHOW_TAG,
TOGGLE_TAG

};

然后在init中添加菜单选项，并关联回调函数

bool HelloWorld::init()
{
//////////////////////////////
// 1. super init first
if ( !Layer::init() )
{
return false;
}

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

auto bg = Sprite::create("Background800x480.png");
bg->setPosition(Vec2(origin.x + visibleSize.width / 2,
origin.y + visibleSize.height / 2
));
this->addChild(bg);

auto placeLable = Label::createWithBMFont("fonts/fnt2.fnt", "Place");
auto placeMenu = MenuItemLabel::create(placeLable, CC_CALLBACK_1(HelloWorld::OnclickMenu, this));
placeMenu->setTag(PLACE_TAG);

auto flipXlabel = Label::createWithBMFont("fonts/fnt2.fnt", "FlipX");
auto flipXmenu = MenuItemLabel::create(flipXlabel,
CC_CALLBACK_1(HelloWorld::OnclickMenu, this));
flipXmenu->setTag(FLIPX_TAG);

auto filpYlabel = Label::createWithBMFont("fonts/fnt2.fnt", "FlipY");
auto flipYmenu = MenuItemLabel::create(filpYlabel,
CC_CALLBACK_1(HelloWorld::OnclickMenu, this));
flipYmenu->setTag(FLIPY_TAG);

auto hideLabel = Label::createWithBMFont("fonts/fnt2.fnt", "Hide and Show");
auto hideMenu = MenuItemLabel::create(hideLabel,
CC_CALLBACK_1(HelloWorld::OnclickMenu, this));;
hideMenu->setTag(HIDE_SHOW_TAG);

auto toggleLabel = Label::createWithBMFont("fonts/fnt2.fnt", "toggle");
auto toggleMenu = MenuItemLabel::create(toggleLabel,
CC_CALLBACK_1(HelloWorld::OnclickMenu, this));
toggleMenu->setTag(TOGGLE_TAG);

auto mn = Menu::create(placeMenu, flipXmenu, flipYmenu, hideMenu, toggleMenu, NULL);
mn->alignItemsVertically();
this->addChild(mn);

return true;
}

void HelloWorld::OnclickMenu(cocos2d::Ref *pSender){

MenuItem *mnItem = (MenuItem*)pSender;

auto sc = Scene::create();
auto Layer = MyAction::create();

Layer->setTag(mnItem->getTag());

sc->addChild(Layer);

auto reScene = TransitionSlideInR::create(1.0f, sc);
Director::getInstance()->replaceScene(reScene);
}


以上就完成了对菜单选项的设置、

然后我们就需要自定义层MyActionScene文件，并在其中添加MyAction类

#ifndef __MYACTION_SCENE_H__
#define __MYACTION_SCENE_H__

#include "cocos2d.h"
#include "HelloWorldScene.h"

class MyAction : public cocos2d::Layer
{
bool hiddenFlag;
cocos2d::Sprite *sprite;

public:

static cocos2d::Scene* createScene();
virtual bool init();
// implement the "static create()" method manually
CREATE_FUNC(MyAction);

// a selector callback
void goMenu(cocos2d::Ref* pSender);
void backMenu(cocos2d::Ref* pSender);
};

#endif // __MYACTION_SCENE_H__


#include "MyActionScene.h"

USING_NS_CC;

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

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

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

auto bg = Sprite::create("Background800x480.png");
bg->setPosition(Vec2(visibleSize.width / 2, visibleSize.height / 2));
this->addChild(bg);

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

auto backMenuItem = MenuItemImage::create("Back-up.png", "Back-down.png", CC_CALLBACK_1(MyAction::backMenu, this));
backMenuItem->setPosition(Director::getInstance()->convertToGL(Vec2(120, 100)));

auto goMenuItem = MenuItemImage::create("Go-up.png", "Go-down.png", CC_CALLBACK_1(MyAction::goMenu, this));
goMenuItem->setPosition(visibleSize.width / 2, 100);

Menu* mn = Menu::create(backMenuItem, goMenuItem, NULL);

mn->setPosition(Vec2::ZERO);
this->addChild(mn);

this->hiddenFlag = true;//精灵隐藏

return true;
}

void MyAction::backMenu(Ref* pSender)
{
auto sc = HelloWorld::createScene();
auto reScene = TransitionSlideInL::create(1.0f, sc);
Director::getInstance()->replaceScene(reScene);

}

void MyAction::goMenu(Ref* pSender)
{
log("Tag = %i", this->getTag());
Size size = Director::getInstance()->getVisibleSize();
Vec2 p = Vec2(CCRANDOM_0_1() * size.width, CCRANDOM_0_1() * size.height);

switch (this->getTag()) {
case PLACE_TAG:
sprite->runAction(Place::create(p));
break;
case FLIPX_TAG:
sprite->runAction(FlipX::create(true));
break;
case FLIPY_TAG:
sprite->runAction(FlipY::create(true));
break;
case HIDE_SHOW_TAG:
if (hiddenFlag) {
sprite->runAction(Hide::create());
hiddenFlag = false;
}
else {
sprite->runAction(Show::create());
hiddenFlag = true;
}
break;
case TOGGLE_TAG:
sprite->runAction(ToggleVisibility::create());
break;
default:
break;
}

}

以上代码就完成了瞬时动作中的翻转，隐藏等一系列瞬时动作的实现，具体还是必须要自己操作过后才能体会到