samgreen / cgvector-awesome Goto Github PK

Doesn't seem to me like this code contains any kind of license. Would be great to have that so I can reuse it as appropriate.

Thanks

On 64 bit CPUs, some functions return invalid values due to the optimization that seems to be specifically made for 32 bit. CGVectorMultiplyByScalar for example.

So apparently, we can do something like this:

#define CGV(x, y) CGVectorMake(x, y)
#define CGP(x, y) CGPointMake(x, y)
#define CGVop(a, op, b) CGV(a.dx op b.dx, a.dy op b.dy)
#define CGPop(a, op, b) CGP(a.x op b.x, a.y op b.y)

CGVop stands for "CGVector operation". Then, we can do something like this:

CGVector a = CGV(10, 10);
CGVector b = CGV(2, 2);
CGVector c = CGVop(a, *, b); // {20, 20}

The downsides are that you'd need a different macro in order to do something like CGVop(a, *, 2.0f), and it looks kinda ugly. But it's short. I like short. Too bad ObjC doesn't have any kind of operator overloading.

It also raises problems when you do something like this CGVop(CGV(10, 10), +, CGVop(20, 20)), which will execute the left hand and right hand side, twice.

Additionally, I've also created some shorthands for CGVectorFromPoint and CGPointFromVector:

#define P2V(p) CGVectorFromPoint(p)
#define V2P(v) CGPointFromVector(v)

Thoughts?