"Cocos2d-x Study Notes" Three types of text class, Batch wizard, C + + four kinds of cast

Three types of display text

Cclabelttf, Cclabelatlas, Cclabelbmfont

Cclabelttf: Using system fonts each string generates a texture that is less efficient to display. Suitable for non-changeable text

Cclabelatlas: Use Nodeatlas to optimize rendering, suitable for frequently changing numbers, such as fractions, money.

Cclabelbmfont: Using Ccspritebatchnode, very flexible, each character is a sprite, you can operate on each character.

Cclabelatlas *lable = cclabelatlas::create ("12434", "Labelatlasing.png", 24, 32, ' 0 '); According to the Cisco code, the order cannot be changed.

Cclabelbmfont *label = cclabelbmfont::create ("abc", "Bitmapfonttest.fnt"); According to the picture to get the font, the principle is batch Processing wizard

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 individually manipulated.

PS: Direct use of the picture, the text is drawn on the picture (limitation: Resolution, Replacement trouble, etc.)

Ccspritebatchnode is also a container, but he can only tolerate ccsprite objects, and requires these sprites to come from the same texture.

Ccspritebatchnode *batch = ccspritebatchnode::create ("Closenormal.png");

AddChild (Batch);

Ccsprite *sprite = Ccsprite::createwithtexture (Batch->gettexture ());

Batch->addchild (sprite);

4 types of cast in C + +

C + + introduced cast is to reduce the errors caused by type conversion, to check the conversion problem at compile, run time

Static_cast is in the compile time check, cast on both sides of the side can do implicit conversion, in order to use static_cast

Dynamic_cast is a run-time check for type conversions between a parent class and a subclass that has a virtual function

Const_cast Convert a constant to a very good amount

Reinterpret_cast, which is called re-interpretation, is of no use.

"Cocos2d-x Study Notes" Three types of text class, Batch wizard, C + + four kinds of cast