Improve implementation of drawing the noodles

include/ui.h

@@ -57,6 +57,7 @@ bool ui_button(const window *wnd, ui_ctx *ctx, rect rect,
                ui_elem_colours colours);
 rect ui_node(const window *wnd, ui_ctx *ctx, rect rect,
              ui_elem_colours colours);
-quad ui_quad(const window *wnd, ui_ctx *ctx, quad qd, ui_elem_colours colours);
+line ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
+               ui_elem_colours colours);
 
 #endif // !UI_H