diff options
Diffstat (limited to 'sdl3_main.c')
| -rw-r--r-- | sdl3_main.c | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/sdl3_main.c b/sdl3_main.c index 7ecca2b..26b447d 100644 --- a/sdl3_main.c +++ b/sdl3_main.c @@ -12,6 +12,8 @@ static void render(void); static void update(float delta); static void process_events(void); +static int checkcollision(float pos1[2], float size1[2], float pos2[2], float size2[2]); + typedef struct { float x, y; } Player; @@ -193,21 +195,13 @@ update(float delta) for(int j = 0; j < 1024; j++) { if(!ghosts[j].active) continue; - - float dx = bullet[i].x - ghosts[j].x; - float dy = bullet[i].y - ghosts[j].y; - - float hs = (ENTITY_SIZE + BULLET_SIZE); - - float minx = dx - hs; - float miny = dy - hs; - float maxx = dx + hs; - float maxy = dy + hs; - bool contains_x = minx < 0 && maxx > 0; - bool contains_y = miny < 0 && maxy > 0; - - if(contains_x && contains_y) { + int r = checkcollision( + (float[2]){ bullet[i].x, bullet[i].y }, (float[2]){ BULLET_SIZE, BULLET_SIZE }, + (float[2]){ ghosts[j].x, ghosts[j].y }, (float[2]){ ENTITY_SIZE, ENTITY_SIZE } + ); + + if(r) { ghosts[j].active = false; bullet[i].active = false; } @@ -273,6 +267,7 @@ update(float delta) bullet[i].y += delta * bullet[i].vy; } } + void process_events() { @@ -292,3 +287,21 @@ process_events() } } +int +checkcollision(float p1[2], float s1[2], float p2[2], float s2[2]) +{ + float p[2], s[2], minx, miny, maxx, maxy; + + + for(int i = 0; i < 2; i++) { + s[i] = s1[i] + s2[i]; + p[i] = p1[i] - p2[i]; + } + + minx = p[0] - s[0]; + maxx = p[0] + s[0]; + miny = p[1] - s[1]; + maxy = p[1] + s[1]; + + return minx < 0 && maxx > 0 && miny < 0 && maxy > 0; +} |