diff --git a/src/main.c b/src/main.c
index 6f9d4f6..e18beea 100644
--- a/src/main.c
+++ b/src/main.c
@@ -192,6 +192,42 @@ void draw_simple_line(uint16_t x, uint16_t y, uint16_t len, bool horizontal)
 	}
 }
 
+void draw_line(uint16_t _x0, uint16_t _y0, uint16_t _x1, uint16_t _y1, bool fill)
+{
+	const float x0 = _x0;
+	const float y0 = _y0;
+	const float x1 = _x1;
+	const float y1 = _y1;
+
+	if (x0 != x1)
+	{
+		const uint16_t x_begin = MIN(x0, x1);
+		const uint16_t x_end = MAX(x0, x1);
+
+		for (uint16_t x = x_begin; x < x_end; ++x)
+		{
+			const uint16_t y = (y1 - y0) * (x - x0) / (x1 - x0) + y0;
+			if (fill)
+				set_pixel(x, y);
+			else
+				clear_pixel(x, y);
+		}
+	}
+	else
+	{
+		const uint16_t y_begin = MIN(y0, y1);
+		const uint16_t y_end = MAX(y0, y1);
+
+		for (uint16_t y = y_begin; y < y_end; ++y)
+		{
+			if (fill)
+				set_pixel(x0, y);
+			else
+				clear_pixel(x0, y);
+		}
+	}
+}
+
 void new_frame_handler(void)
 {
 	if (vga_pixel_ptr && dma_ready)
@@ -251,10 +287,19 @@ int main()
 		set_pixel(x, (x / 32) * 4 + 120);
 	}
 	// draw "E" - nice because it's not symmetrical along X
-	draw_simple_line(100, 100, 8, true);
-	draw_simple_line(100, 100, 8, false);
-	draw_simple_line(100, 104, 8, true);
-	draw_simple_line(100, 108, 8, true);
+	draw_line(100, 100, 108, 100, true);
+	draw_line(100, 100, 100, 108, true);
+	draw_line(100, 104, 104, 104, true);
+	draw_line(100, 108, 108, 108, true);
+
+	for (uint16_t x = 0; x < 480; x += 20)
+	{
+		draw_line(x, 0, 0, 480 - x, true);
+		draw_line(480, x, 480 - x, 480, true);
+	}
+
+	draw_line(200, 200, 280, 78, true);
+	draw_line(87, 42, 42, 87, true);
 
 	// Running programs on PIO
 	PIORun vga_hsync, vga_vsync, vga_pixel;