cocos2dx 3.x(移動修改精靈坐標MoveTo與MoveBy)

//
//  MainScene.cpp
//  helloworld
//
//  Created by apple on 16/11/8.
//
//

#include "MainScene.hpp"
Scene * MainScene::createScene()
{
     auto scene = Scene::create();    //創建層
    MainScene *layer = MainScene::create();
    scene->addChild(layer);
    return scene;
}
bool MainScene::init(){
    if (!Layer::init()) {
        return false;
    }
    
    
//    MoveTo：把某一Sprite移動到某個位置
//    MoveBy:把某一Sprite移動一段距離,它有一個方法reverse，它讓對象按原路徑返回
    
    
    /*
     *@MoveTo,移動到某個Point
     */
    Size size = Director::getInstance()->getWinSize();
    Sprite *spriteMoveTo = Sprite::create("snow.png");
    spriteMoveTo->setPosition(Vec2(size.width / 2.0f, size.height / 2.0f));
    this->addChild(spriteMoveTo, 1);
    
    ActionInterval *forward = MoveTo::create(4, Vec2(300, 300));
    spriteMoveTo->runAction(forward);
    
    
    /*
     *MoveBy,移動一段距離
     */
    Sprite *spriteMoveBy = Sprite::create("snow.png");
    spriteMoveBy->setPosition(Vec2(size.width / 4.0f, size.height / 4.0f));
    this->addChild(spriteMoveBy, 1);
    
    ActionInterval *forwardBy = MoveBy::create(2, Vec2(200, 300));
    ActionInterval *backBy = forwardBy->reverse();
    Action *action = Repeat::create(dynamic_cast<FiniteTimeAction *>(Sequence::create(forwardBy, backBy, NULL)), 4);
    spriteMoveBy->runAction(action);
    
    
    
    return true;
}