cocos2dx day 1

原文：http://www.cocos2d-x.org/programmersguide/2/index.html

一、Basic Concepts

1.director

2.scene

2.1 scene graph

negative,从左边开始画，positive，从右边开始画

// Adds a child with the z-order of -2, that means
// it goes to the "left" side of the tree (because it is negative)
scene->addChild(title_node, -2);

// When you don‘t specify the z-order, it will use 0
scene->addChild(label_node);

// Adds a child with the z-order of 1, that means
// it goes to the "right" side of the tree (because it is positive)
scene->addChild(sprite_node, 1);

3.node/sprite/label

3.1 sprite

可以给玩家操控的对象，新建一个sprite并且设置他的属性。

// This is how to create a sprite
auto mySprite = Sprite::create("mysprite.png");

// this is how to change the properties of the sprite
mySprite->setPosition(Vec2(500, 0));

mySprite->setRotation(40);

mySprite->setScale(2.0); // sets scale X and Y uniformly//设置图片大小

mySprite->setAnchorPoint(Vec2(0, 0));

4.Action

4.1 moveto和moveby的区别（网上查的答案，后面有空再仔细研究，先扫盲）

moveto:移动到的坐标点，调用reverse方法，可以朝反向移动。

moveby:相对于node现在的坐标点，也有reverse方法，但是调用会报错，难道是bug？4.2 Sequence当需要sprite或者Node做连续动作时，可以在runAction里面用Sequence

auto myNode = Node::create()

auto moveTo1 = MoveTo::create(2, Vec2(50,10));
auto moveBy1 = MoveBy::create(2, Vec2(100,10));
auto moveTo2 = MoveTo::create(2, Vec2(150,10));

myNode->runAction(Spawn::create(moveTo1, moveBy1, moveTo2, nullptr));

但是在create方法里面，不加最后一个参数，nullptr居然会报错，不明白。