badge/util/rectangle.h

   1 #ifndef INCLUDED_RECTANGLE_H
   2 #define INCLUDED_RECTANGLE_H
   3
   4 #include "fixed_point.h"
   5
   6 typedef struct {
   7   fixed_point x;
   8   fixed_point y;
   9 } vec2d;
  10
  11 static inline vec2d vec2d_add(vec2d v1, vec2d v2) {
  12   vec2d r = {
  13     fixed_point_add(v1.x, v2.x),
  14     fixed_point_add(v1.y, v2.y)
  15   };
  16
  17   return r;
  18 }
  19
  20 static inline vec2d vec2d_neg(vec2d v) {
  21   vec2d r = {
  22     fixed_point_neg(v.x),
  23     fixed_point_neg(v.y)
  24   };
  25   return r;
  26 }
  27
  28 typedef struct {
  29   vec2d pos;
  30   vec2d extent;
  31 } rectangle;
  32
  33 static inline rectangle   rectangle_new(vec2d pos, vec2d extent) { rectangle r = { pos, extent }; return r; }
  34
  35 static inline fixed_point rectangle_top   (rectangle const *r) { return r->pos.y; }
  36 static inline fixed_point rectangle_left  (rectangle const *r) { return r->pos.x; }
  37 static inline fixed_point rectangle_bottom(rectangle const *r) { return fixed_point_add(rectangle_top (r), r->extent.y); }
  38 static inline fixed_point rectangle_right (rectangle const *r) { return fixed_point_add(rectangle_left(r), r->extent.x); }
  39
  40 static inline fixed_point rectangle_width (rectangle const *r) { return r->extent.x; }
  41 static inline fixed_point rectangle_height(rectangle const *r) { return r->extent.y; }
  42
  43 static inline vec2d rectangle_mid(rectangle const *r) {
  44   vec2d v = { fixed_point_add(r->pos.x, fixed_point_div(r->extent.x, FIXED_POINT(2, 0))),
  45               fixed_point_add(r->pos.y, fixed_point_div(r->extent.y, FIXED_POINT(2, 0)))
  46   };
  47   return v;
  48 }
  49
  50 static inline void rectangle_move_to  (rectangle *r, vec2d       new_pos) { r->pos = new_pos; }
  51 static inline void rectangle_move_to_x(rectangle *r, fixed_point new_x  ) { r->pos.x = new_x; }
  52 static inline void rectangle_move_to_y(rectangle *r, fixed_point new_y  ) { r->pos.x = new_y; }
  53
  54 static inline void rectangle_move_rel (rectangle *r, vec2d       vec    ) { r->pos = vec2d_add(r->pos, vec); }
  55 static inline void rectangle_expand   (rectangle *r, vec2d       extent ) { r->extent = extent; }
  56
  57 static inline bool rectangle_intersect(rectangle const *r1,
  58                                        rectangle const *r2) {
  59   return (fixed_point_lt(rectangle_top   (r1), rectangle_bottom(r2)) &&
  60           fixed_point_gt(rectangle_bottom(r1), rectangle_top   (r2)) &&
  61           fixed_point_lt(rectangle_left  (r1), rectangle_right (r2)) &&
  62           fixed_point_gt(rectangle_right (r1), rectangle_left  (r2)));
  63 }
  64
  65 #endif