Update drawing timing

main.c

@@ -21,41 +21,31 @@ int main() {
         return EXIT_FAILURE;
     }
 
-    int32_t time_elapsing_per_second = 3600 * 24 * 365;
-    int32_t update_per_second = 1000;
-    printf("%d\n", time_elapsing_per_second / update_per_second);
-    SolarSystem *solar_system = solar_system_create(time_elapsing_per_second / update_per_second);
-    int32_t hz = 240;
-    int32_t a = 0;
-    int32_t b = 0;
-    int32_t elapsed_seconds = 0;
+    int32_t time_elapsing_per_second = 3600 * 24 * 100;
+    int32_t refresh_rate = 240;
+    int32_t elapsed_time = 0;
+    double sleep_duration = 1.0 / refresh_rate * 1E9;
 
+    SolarSystem *solar_system = solar_system_create(time_elapsing_per_second / refresh_rate);
+
+    int64_t tmp = time(NULL) % 1000;
 
     while (true) {
         solar_system_update(solar_system);
-        b += 1;
-
-        if ((double)b >= (double)update_per_second / hz * (a + 1)) {
-            a += 1;
-
         gfx_present(context);
         solar_system_draw(solar_system, context);
 
-            if (b >= update_per_second) {
-                b = 0;
-                elapsed_seconds += 1;
+        if (elapsed_time % refresh_rate == 0) {
             char title[100];
-                sprintf(title, "Solar System (%d)", elapsed_seconds);
+            sprintf(title, "Solar System (%d : %ld)", elapsed_time / refresh_rate, (time(NULL) - tmp) % 1000);
             SDL_SetWindowTitle(context->window, title);
         }
-            if (a % hz == 0)
-                a = 0;
-        }
 
         if (gfx_keypressed() == SDLK_ESCAPE)
             break;
-        struct timespec t = {.tv_sec = 0, .tv_nsec = 1.0 / update_per_second * 1E9};
+        struct timespec t = {.tv_sec = 0, .tv_nsec = sleep_duration};
         nanosleep(&t, NULL);
+        elapsed_time += 1;
     }
 
     gfx_destroy(context);