src/math/rect.h

   1 #ifndef RECT_H_
   2 #define RECT_H_
   3
   4 #include <SDL.h>
   5 #include <math.h>
   6
   7 #include "math/vec.h"
   8
   9 typedef enum Rect_side {
  10     RECT_SIDE_LEFT = 0,
  11     RECT_SIDE_RIGHT,
  12     RECT_SIDE_TOP,
  13     RECT_SIDE_BOTTOM,
  14
  15     RECT_SIDE_N
  16 } Rect_side;
  17
  18 typedef struct Rect {
  19     float x, y, w, h;
  20 } Rect;
  21
  22 typedef struct Line {
  23     Vec2f p1;
  24     Vec2f p2;
  25 } Line;
  26
  27 Rect horizontal_thicc_line(float x1, float x2, float y, float thiccness);
  28 Rect vertical_thicc_line(float y1, float y2, float x, float thiccness);
  29
  30 Rect rect(float x, float y, float w, float h);
  31 Rect rect_from_vecs(Vec2f position, Vec2f size);
  32 Rect rect_from_points(Vec2f p1, Vec2f p2);
  33 Rect rect_from_sdl(const SDL_Rect *rect);
  34
  35 Rect rects_overlap_area(Rect rect1, Rect rect2);
  36
  37 static inline
  38 Rect rect_boundary2(Rect rect1, Rect rect2)
  39 {
  40     return rect_from_points(
  41         vec(
  42             fminf(rect1.x, rect2.x),
  43             fminf(rect1.y, rect2.y)),
  44         vec(
  45             fmaxf(rect1.x + rect1.w, rect2.x + rect2.w),
  46             fmaxf(rect1.y + rect1.h, rect2.y + rect2.h)));
  47 }
  48
  49 static inline Vec2f rect_position(Rect rect)
  50 {
  51     return vec(rect.x, rect.y);
  52 }
  53
  54 static inline Rect rect_scale(Rect rect, float d)
  55 {
  56     rect.x -= d;
  57     rect.y -= d;
  58     rect.w += d * 2.0f;
  59     rect.h += d * 2.0f;
  60     return rect;
  61 }
  62
  63 int rect_contains_point(Rect rect, Vec2f p);
  64
  65 int rects_overlap(Rect rect1, Rect rect2);
  66
  67 void rect_object_impact(Rect object,
  68                         Rect obstacle,
  69                         int *sides);
  70
  71 Line rect_side(Rect rect, Rect_side side);
  72
  73 Rect rect_from_point(Vec2f p, float w, float h);
  74
  75 float line_length(Line line);
  76
  77 SDL_Rect rect_for_sdl(Rect rect);
  78
  79 Vec2f rect_center(Rect rect);
  80
  81 Vec2f rect_snap(Rect pivot, Rect *rect);
  82 Vec2f rect_impulse(Rect *r1, Rect *r2);
  83
  84 #endif  // RECT_H_