Angled line on a curved edge

1# Gallery: shapes / fuse-curved2page = canvas(name="Curved seams", size=(120 mm, 80 mm), background="#f7f9fc")3font = "DejaVu Sans"4heading = text(content="Curved seams", font_family=font, font_size=14 pt, color="#203864")5page.add(heading, target=page.top_left, offset=(7 mm, 5 mm))6# BEGIN DEMO7disk = ellipse(size=(22 mm, 22 mm), fill="#087f8c")8round_surface = page.add(disk, target=page.top_left, offset=(12 mm, 24 mm))9up_line = page.add(line(dx=30 mm, dy=-8 mm, line_width=3 mm),10                   target=page.top_left, offset=(46 mm, 27 mm))11round_join = page.fuse(round_surface, up_line,12                       points=(round_surface.middle_right, up_line.start),13                       bridge_width=3 mm, junction=round, radius=2 mm,14                       fill="#087f8c", border_color="none")15 16freeform = path(commands=[move_to(0 mm,0 mm), line_to(20 mm,0 mm),17                          cubic_to(25 mm,4 mm,25 mm,16 mm,20 mm,20 mm),18                          line_to(0 mm,20 mm), close()], fill="#087f8c")19curved_surface = page.add(freeform, target=page.top_left, offset=(12 mm, 51 mm))20down_line = page.add(line(dx=30 mm, dy=8 mm, line_width=3 mm),21                     target=page.top_left, offset=(46 mm, 61 mm))22curved_join = page.fuse(curved_surface, down_line,23                        points=(curved_surface.middle_right, down_line.start),24                        bridge_width=3 mm, junction=round, radius=2 mm,25                        fill="#087f8c", border_color="none")26# END DEMO