libs/Rectangles.h

   1 /* -*-c-*- */
   2
   3 /*
   4  *  Convinence functions for manipulating rectangles, segments, regions ...etc.
   5  */
   6
   7 #ifndef FRECTANGLES_H
   8 #define FRECTANGLES_H
   9
  10 /* ---------------------------- included header files ---------------------- */
  11
  12 /* ---------------------------- global definitions ------------------------- */
  13
  14 /* ---------------------------- global macros ------------------------------ */
  15
  16 /* ---------------------------- type definitions --------------------------- */
  17
  18 /* ---------------------------- forward declarations ----------------------- */
  19
  20 /* ---------------------------- exported variables (globals) --------------- */
  21
  22 /* ---------------------------- interface functions ------------------------ */
  23
  24 /* If the two rectangles [x1, y1, w1, h2] and [x2, x2, w2, h2] have a
  25  * non emtpy interstection this function return True and the
  26  * XRectangle *r is set to the intersection (if not NULL). If the two
  27  * rectangles have an emty intersection False is returned and r is not
  28  * modified.  */
  29 Bool frect_get_intersection(
  30         int x1, int y1, int w1, int h1, int x2, int y2, int w2, int h2,
  31         XRectangle *r);
  32
  33 /* as above but the input are XRectangles */
  34 Bool frect_get_rect_intersection(
  35         XRectangle a, XRectangle b, XRectangle *r);
  36
  37 /* as above for two segments */
  38 Bool frect_get_seg_intersection(
  39         int x1, int w1, int x2, int w2, int *x, int *w);
  40
  41 #endif