Cocos2d-x Basics

Scene

Scene is game scene.
You need add at least one scene in your game.
This example is blank scene.

HellWorld.h

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

class HelloWorld : public cocos2d::Layer
{
public:
    // there's no 'id' in cpp, so we recommend returning the class instance pointer
    static cocos2d::Scene* createScene();

    // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
    virtual bool init();  
    
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
};
#endif // __HELLOWORLD_SCENE_H__

HelloWorld.cpp

#include "HelloWorldScene.h"

USING_NS_CC;

Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
    
    // 'layer' is an autorelease object
    auto layer = HelloWorld::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 HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    
    Size visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();
    // Add layout
}

If you want to add new scene, you need to add file name to jni/Android.mk

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp

Label

auto label = LabelTTF::create("Hello World", "Arial", 24);
    
// position the label on the center of the screen
label->setPosition(Vec2(origin.x + visibleSize.width/2,
                            origin.y + visibleSize.height - label->getContentSize().height));
// add the label as a child to this layer
this->addChild(label, 1);

Resources

You need to add any images in Resources file in your project root.
In android, images in this directory are copied to assets directory.

Node Enumeration

parent->enumerateChildren("point",[](Node* node) -> bool {
    // You can get children nodes named "point" as Node class
    return false;
}

Get node by name

Label *title = (Label *)this->getChildByName("title"); // Only one node

Get Current scene and evaluation

Vector<cocos2d::Node *> layers = CCDirector::sharedDirector()->getRunningScene()->getChildren();
for (int i=0; i < layers.size(); i++) {
   Node *node = layers.at(i);
   if (instanceof<GamePlayScene>(node)) {
      //((GamePlayScene *)node)->emergeNativeNode(point);
      // The Node is Game scene
   }
}

instanceof is class check method, please see instanceOf

String format

Use createWithFormat

const auto str_index = String::createWithFormat("%s%d.png", name, number);