Fun with Sprites – Sky Defense - Cocos2d-x by Example Beginner's Guide - page 105

Time for action - creating
SpriteBatchNode
Let's begin implementing the createGameScreen method in GameLayer.cpp . Just
below the lines that add the bg sprite, we instantiate our batch node:
void GameLayer::createGameScreen() {
//add bg
auto bg = Sprite::create("bg.png");
...
SpriteFrameCache::getInstance()->
addSpriteFramesWithFile("sprite_sheet.plist");
_gameBatchNode =
SpriteBatchNode::create("sprite_sheet.png");
this->addChild(_gameBatchNode);
In order to create the batch node from a sprite sheet, we first load all the frame information
described by the sprite_sheet.plist file into SpriteFrameCache . And then we
create the batch node with the sprite_sheet.png file, which is the source texture
shared by all sprites added to this batch node. (The background image is not part of the
sprite sheet, so it's added separately before we add _gameBatchNode to GameLayer.)
Now we can start putting stuff inside _gameBatchNode .
1. First, the city:
for (int i = 0; i < 2; i++) {
auto sprite = Sprite::createWithSpriteFrameName
("city_dark.png");
sprite->setAnchorPoint(Vec2(0.5,0));
sprite->setPosition(_screenSize.width * (0.25f + i
* 0.5f),0));
_gameBatchNode->addChild(sprite, kMiddleground);
sprite =