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- #include "pt2.h"
-
- /*************************************************************/
- /* */
- /* Two utility functions to add and subtract 2D integer */
- /* points. */
- /* */
- /*************************************************************/
-
- pt2* addPt2(pt2 *a, pt2 *b, pt2 *c)
- {
- c->x = a->x + b->x;
- c->y = a->y + b->y;
- return c;
- }
-
- pt2* subPt2(pt2 *a, pt2 *b, pt2 *c)
- {
- c->x = a->x - b->x;
- c->y = a->y - b->y;
- return c;
- }
-