def test_background_poly(output_dir): """ test drawing polygons to the background """ mc = MapCanvas((400, 300), preset_colors='web') mc.background_color = 'transparent' mc.clear_background() mc.draw_polygon(((-30, 30), (30, 30), (30, -20), (-30, -20)), fill_color='blue', line_color='black', background=True) mc.save_background(os.path.join(output_dir, "background.png"))