[Cocos2d-x Study Notes] Three Types of texts, batch processing genie, C ++ four cast, cocos2d-xcast

[Cocos2d-x Study Notes] Three Types of texts, batch processing genie, C ++ four cast, cocos2d-xcast

Three types of display text

CCLabelTTF, CCLabelAtlas, CCLabelBMFont

 

CCLabelTTF: a texture is generated for each character string in the system font, resulting in low display efficiency. Suitable for non-changing text

CCLabelAtlas: Uses NodeAtlas to optimize rendering and is suitable for frequently changing numbers, such as scores and money.

CCLabelBMFont: it is flexible to use CCSpriteBatchNode. Each character is an Genie and can be operated on every character.

 

CCLabelAtlas * lable = CClabelAtlas: create ("12434", "labelatlasing.png", 24, 32, '0'); according to the Cisco code, the sequence cannot be changed.

 

CCLabelBMFont * label = CCLabelBMFont: create ("abc", "bitmapFontTest. fnt"); font Based on the image. The principle is the batch processing genie.

CCArray * arr = label-> getChildren (); get all characters

CCSprite * spriteA = (CCSprite *) arr-> objectAtIndex (0); 0 indicates the first character

SpriteA-> setRotation (90); each character can be operated separately

 

PS: use images directly and draw texts on images (Restrictions: resolution, trouble changing, etc)

CCSpriteBatchNode is also a container, but it can only accommodate CCSprite objects and requires these genie to come from the same texture.

CCSpriteBatchNode * batch = CCSpriteBatchNode: create ("CloseNormal.png ");

AddChild (batch );

CCSprite * sprite = CCSprite: createWithTexture (batch-> getTexture ());

Batch-> addChild (sprite );

 

Four types of C ++ cast

C ++ introduces cast to reduce errors caused by type conversion and check conversion problems during compilation and running.

 

Static_cast checks during compilation. Both sides of cast require that one side be implicitly converted before static_cast can be used.

Dynamic_cast is a runtime check, used for type conversion between the parent class and subclass with virtual functions

Const_cast converts a constant to a constant

Reinterpret_cast is called re-interpretation, which is useless.