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   return r;
  17 }
  18
  19 static inline vec2d vec2d_sub(vec2d v1, vec2d v2) {
  20   vec2d r = {
  21     fixed_point_sub(v1.x, v2.x),
  22     fixed_point_sub(v1.y, v2.y)
  23   };
  24   return r;
  25 }
  26
  27 static inline vec2d vec2d_neg(vec2d v) {
  28   vec2d r = {
  29     fixed_point_neg(v.x),
  30     fixed_point_neg(v.y)
  31   };
  32   return r;
  33 }
  34
  35 typedef struct {
  36   vec2d pos;
  37   vec2d extent;
  38 } rectangle;
  39
  40 static inline rectangle   rectangle_new(vec2d pos, vec2d extent) { rectangle r = { pos, extent }; return r; }
  41
  42 static inline fixed_point rectangle_top   (rectangle const *r) { return r->pos.y; }
  43 static inline fixed_point rectangle_left  (rectangle const *r) { return r->pos.x; }
  44 static inline fixed_point rectangle_bottom(rectangle const *r) { return fixed_point_add(rectangle_top (r), r->extent.y); }
  45 static inline fixed_point rectangle_right (rectangle const *r) { return fixed_point_add(rectangle_left(r), r->extent.x); }
  46
  47 static inline fixed_point rectangle_width (rectangle const *r) { return r->extent.x; }
  48 static inline fixed_point rectangle_height(rectangle const *r) { return r->extent.y; }
  49
  50 static inline fixed_point rectangle_mid_x (rectangle const *r) { return fixed_point_add(r->pos.x, fixed_point_div(r->extent.x, FIXED_INT(2))); }
  51 static inline fixed_point rectangle_mid_y (rectangle const *r) { return fixed_point_add(r->pos.y, fixed_point_div(r->extent.y, FIXED_INT(2))); }
  52
  53 static inline vec2d       rectangle_mid   (rectangle const *r) { vec2d v = { rectangle_mid_x(r), rectangle_mid_y(r) }; return v; }
  54
  55 static inline void rectangle_move_to  (rectangle *r, vec2d       new_pos) { r->pos = new_pos; }
  56 static inline void rectangle_move_to_x(rectangle *r, fixed_point new_x  ) { r->pos.x = new_x; }
  57 static inline void rectangle_move_to_y(rectangle *r, fixed_point new_y  ) { r->pos.x = new_y; }
  58
  59 static inline void rectangle_move_rel (rectangle *r, vec2d       vec    ) { r->pos = vec2d_add(r->pos, vec); }
  60 static inline void rectangle_expand   (rectangle *r, vec2d       extent ) { r->extent = extent; }
  61
  62 static inline bool rectangle_intersect(rectangle const *r1,
  63                                        rectangle const *r2) {
  64   return (fixed_point_lt(rectangle_top   (r1), rectangle_bottom(r2)) &&
  65           fixed_point_gt(rectangle_bottom(r1), rectangle_top   (r2)) &&
  66           fixed_point_lt(rectangle_left  (r1), rectangle_right (r2)) &&
  67           fixed_point_gt(rectangle_right (r1), rectangle_left  (r2)));
  68 }
  69
  70 #endif