Added code for drawing a circle around selected vertex

game.cpp

@@ -99,6 +99,13 @@ void Game::render()
 	}
     }
 
+    // Finally, ring the selected vertex
+    if (data.get_current_vertex() != NULL)
+    {
+	Vertex* v = data.get_current_vertex();
+	DrawUtils::draw_circle(display, v->x, v->y, v->r + 5, 0x000000);
+    }
+
     SDL_Flip(display);
 }