[Objective-C] CGRect, CGPoint, CGSize

/* Points. */

struct CGPoint {

  CGFloat x;

  CGFloat y;

};

typedef struct CGPoint CGPoint;

/* Sizes. */

struct CGSize {

  CGFloat width;

  CGFloat height;

};

typedef struct CGSize CGSize;

/* Rectangles. */

struct CGRect {

  CGPoint origin;

  CGSize size;

};

typedef struct CGRect CGRect;