Vector2在C ++中是否等效？

Question

Hi I'm porting my game from c#/xna to c++/cocos2d-x and I was trying to find an equivalent to Vector2. I did find a couple such as b2Vec2, I'm just not sure which one I should use because I need it to be cross platform and not bound to a specific operating system.

Answer 1

The class you're looking for is the poorly-named* CCPoint class. Cocos2d-x is a direct port of the API of Cocos2d, which was designed for Objective C. And since Objective C doesn't have operator overloading, neither does Cocos2d-x, even though it's written in C++ where operator overloading exists. So you have to use free-functions to do vector operations .

*: In case you're wondering why it is poorly named, "vector" covers the concept of "point" (a position within a space) and "direction" (a direction in a space). A vector can be either of these. Adding vectors has a specific meaning geometrically, as does subtracting them, multiplying them, taking the length, etc. Adding a point to another point is nonsense, geometrically. You can only add vector directions , not positions. You can transform positions into another space, but you don't do that by adding one position to another.