add more low level drawing functions

main.cpp

@@ -36,6 +36,7 @@ int main()
 
     sf::Clock clock;
     bool toggle = false;
+    bool inverted = false;
 
     while (window.isOpen())
     {
@@ -87,6 +88,14 @@ int main()
         {
             clock.restart();
             toggle = !toggle; // Change something every half second
+            
+            // Invert display every 4 seconds (8 cycles)
+            static int cycle_count = 0;
+            cycle_count++;
+            if (cycle_count % 8 == 0) {
+                renderer.invert_buffer();
+                inverted = !inverted;
+            }
 
             // Clear buffer
             for (int i = 0; i < sizeof(bit_buffer); i++)
@@ -131,9 +140,14 @@ int main()
             renderer.draw_line(10, 200, 90, 250, true);
             renderer.draw_line(110, 200, 190, 250, true);
             
+            // Demonstrate clipping - draw a circle that gets clipped
+            renderer.set_clip_rect(300, 200, 80, 60);  // Small rectangle in bottom-right
+            renderer.draw_filled_circle(340, 230, 40, true);  // Circle that extends outside clip rect
+            renderer.reset_clip_rect();  // Reset to full screen
+            
             // Text with different fonts
             renderer.set_font(&font_acme_5_outlines);
-            renderer.draw_string_scaled(10, 10, "Drawing Demo", 2);
+            renderer.draw_string_scaled(10, 10, inverted ? "INVERTED MODE" : "Drawing Demo", 2);
             
             renderer.set_font(&font_5x5);
             renderer.draw_string_scaled(10, 270, command_buffer, 1);