diff --git a/include/gfx.hpp b/include/gfx.hpp
new file mode 100644
index 0000000..34a444e
--- /dev/null
+++ b/include/gfx.hpp
@@ -0,0 +1,9 @@
+#ifndef GFX_UTILS_HPP
+    #define GFX_UTILS_HPP
+    #include <SDL3/SDL_render.h>
+
+namespace gfx {
+    void draw_circle(SDL_Renderer *renderer, int center_x, int center_y, int radius);
+}
+
+#endif
diff --git a/src/gfx/circle.cpp b/src/gfx/circle.cpp
new file mode 100644
index 0000000..03a8de9
--- /dev/null
+++ b/src/gfx/circle.cpp
@@ -0,0 +1,30 @@
+#include <SDL3/SDL_render.h>
+
+namespace gfx {
+    void draw_circle(SDL_Renderer *renderer, int center_x, int center_y, int radius) {
+        int x = radius;
+        int y = 0;
+        int decision = 1 - x;
+
+        SDL_SetRenderDrawColor(renderer, 255, 0, 255, 255);
+        while (x >= y) {
+            SDL_RenderPoint(renderer, center_x + x, center_y + y);
+            SDL_RenderPoint(renderer, center_x - x, center_y + y);
+            SDL_RenderPoint(renderer, center_x + x, center_y - y);
+            SDL_RenderPoint(renderer, center_x - x, center_y - y);
+            SDL_RenderPoint(renderer, center_x + y, center_y + x);
+            SDL_RenderPoint(renderer, center_x - y, center_y + x);
+            SDL_RenderPoint(renderer, center_x + y, center_y - x);
+            SDL_RenderPoint(renderer, center_x - y, center_y - x);
+
+            y++;
+
+            if (decision <= 0) {
+                decision += 2 * y + 1;
+            } else {
+                x--;
+                decision += 2 * (y - x + 1);
+            }
+        }
+    }
+}
diff --git a/src/main.cpp b/src/main.cpp
index 5b3ddd0..5da6c96 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4,6 +4,7 @@
 #include <SDL3/SDL_timer.h>
 #include <cstdio>
 #include <cstdlib>
+#include "../include/gfx.hpp"
 
 bool key_event(SDL_Event e) {
     if (e.type == SDL_EVENT_KEY_DOWN) {
@@ -26,33 +27,6 @@ bool event_handling(SDL_Event e) {
     return false;
 }
 
-void draw_circle(SDL_Renderer *renderer, int centerX, int centerY, int radius) {
-    int x = radius;
-    int y = 0;
-    int decision = 1 - x;
-
-    SDL_SetRenderDrawColor(renderer, 255, 0, 255, 255);
-    while (x >= y) {
-        SDL_RenderPoint(renderer, centerX + x, centerY + y);
-        SDL_RenderPoint(renderer, centerX - x, centerY + y);
-        SDL_RenderPoint(renderer, centerX + x, centerY - y);
-        SDL_RenderPoint(renderer, centerX - x, centerY - y);
-        SDL_RenderPoint(renderer, centerX + y, centerY + x);
-        SDL_RenderPoint(renderer, centerX - y, centerY + x);
-        SDL_RenderPoint(renderer, centerX + y, centerY - x);
-        SDL_RenderPoint(renderer, centerX - y, centerY - x);
-
-        y++;
-
-        if (decision <= 0) {
-            decision += 2 * y + 1;
-        } else {
-            x--;
-            decision += 2 * (y - x + 1);
-        }
-    }
-}
-
 int main() {
     if (!SDL_Init(SDL_INIT_VIDEO)){ 
         std::printf("SDL_INIT() failed");
@@ -61,8 +35,15 @@ int main() {
 
     SDL_Window *window;
     window = SDL_CreateWindow("Physics Sim", 720, 540, SDL_WINDOW_RESIZABLE);
+    if (window == NULL) {
+        std::printf("SDL_CreateWindow() failed");
+        return EXIT_FAILURE;
+    }
 
     SDL_Renderer *renderer = SDL_CreateRenderer(window, NULL);
+    if (renderer == NULL) {
+        std::printf("SDL_CreateRenderer() failed");
+    }
 
     SDL_Event e;
 
@@ -76,7 +57,7 @@ int main() {
         exit = event_handling(e);
         SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
         SDL_RenderClear(renderer);
-        draw_circle(renderer, circle_pos.x, circle_pos.y, 10);
+        gfx::draw_circle(renderer, circle_pos.x, circle_pos.y, 10);
         circle_pos.x++;
         SDL_RenderPresent(renderer);
         SDL_Delay(16);