Point functions
[Math]
Data Structures | |
| struct | POINT32 |
| 2D Point struct More... | |
Functions | |
| INLINE POINT * | pt_set (POINT *pd, int x, int y) |
| Initialize pd to (x, y). | |
| INLINE POINT * | pt_add (POINT *pd, const POINT *pa, const POINT *pb) |
| Point addition: pd = pa + pb. | |
| INLINE POINT * | pt_sub (POINT *pd, const POINT *pa, const POINT *pb) |
| Point subtraction: pd = pa - pb. | |
| INLINE POINT * | pt_scale (POINT *pd, const POINT *pa, int c) |
| Point scale: pd = c * pa. | |
| INLINE POINT * | pt_add_eq (POINT *pd, const POINT *pb) |
| Point increment: pd += pb. | |
| INLINE POINT * | pt_sub_eq (POINT *pd, const POINT *pb) |
| Point decrement: pd -= pb. | |
| INLINE POINT * | pt_scale_eq (POINT *pd, int c) |
| Point scale: pd *= c. | |
| INLINE int | pt_cross (const POINT *pa, const POINT *pb) |
| Point 'cross'-product: pa × pb. | |
| INLINE int | pt_dot (const POINT *pa, const POINT *pb) |
| Point 'dot'-product:pa · pb. | |
| int | pt_in_rect (const POINT *pt, const struct RECT *rc) |
Function Documentation
| INLINE int pt_cross | ( | const POINT * | pa, | |
| const POINT * | pb | |||
| ) |
Point 'cross'-product: pa × pb.
Actually, there's no such thing as a 2D cross-product, but you could extend it to 3D and get the value of its z-component, which can be used for a test for parallelism.
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