diff --git a/frame/src/main.cpp b/frame/src/main.cpp
index 5e59351..1951251 100644
--- a/frame/src/main.cpp
+++ b/frame/src/main.cpp
@@ -39,8 +39,9 @@ int main()
 
         target.DrawLine(center, end);
     }
-
+    target.DrawCircle(center, 200);
     target.DrawCircle(center, 210);
+    target.DrawCircle(center, 220);
 
     display.Display(target.getImage());
 
diff --git a/frame/src/render/RenderTarget.cpp b/frame/src/render/RenderTarget.cpp
index 09af0d6..a368c45 100644
--- a/frame/src/render/RenderTarget.cpp
+++ b/frame/src/render/RenderTarget.cpp
@@ -12,6 +12,8 @@ namespace frame::render
 
     void RenderTarget::DrawPixel(Vector const& position, Color color)
     {
+        if(position.x < 0 || position.y < 0 || position.x >= image.getWidth() || position.y > image.getHeight())
+            return;
         image.at(position.x, position.y) = color;
     }
 
@@ -79,26 +81,42 @@ namespace frame::render
         int32_t const r_2 = radius * radius;
         Vector pos{0, -radius};
 
-        pos.x += 1;
-        float E =
-            pos.x * pos.x + ((float)pos.y - 0.5f) * ((float)pos.y - 0.5f) - r_2;
+        DrawPixel(center + pos, color);
+        DrawPixel(center + Vector{pos.x, pos.y * -1}, color);
+        DrawPixel(center + Vector{pos.x * -1, pos.y * -1}, color);
+        DrawPixel(center + Vector{pos.x * -1, pos.y}, color);
+
+        DrawPixel(center + Vector{pos.y, pos.x}, color);
+        DrawPixel(center + Vector{pos.y, pos.x * -1}, color);
+        DrawPixel(center + Vector{pos.y * -1, pos.x * -1}, color);
+        DrawPixel(center + Vector{pos.y * -1, pos.x}, color);
 
         while(pos.x <= radius / std::sqrt(2.f))
         {
-            if(E < 0)
+            float E = pos.x * pos.x + ((float)pos.y + 0.5f) * ((float)pos.y + 0.5f) - r_2;
+
+            if(E <= 0)
             {
                 pos.x += 1;
 
-                E += 3;
+                E += 2 * pos.x + 3;
             } else
             {
                 pos.x += 1;
-                pos.y -= 1;
+                pos.y += 1;
 
-                E -= 2 * (-radius) + 5;
+                E += 2 * pos.x - 2 * pos.y + 5;
             }
 
             DrawPixel(center + pos, color);
+            DrawPixel(center + Vector{pos.x, pos.y * -1}, color);
+            DrawPixel(center + Vector{pos.x * -1, pos.y * -1}, color);
+            DrawPixel(center + Vector{pos.x * -1, pos.y}, color);
+
+            DrawPixel(center + Vector{pos.y, pos.x}, color);
+            DrawPixel(center + Vector{pos.y, pos.x * -1}, color);
+            DrawPixel(center + Vector{pos.y * -1, pos.x * -1}, color);
+            DrawPixel(center + Vector{pos.y * -1, pos.x}, color);
         }
     }