def _quadratic_callback(max_err, subpath_start, curr_xy, cmd, args, prev_xy,
prev_cmd, prev_args):
if cmd.upper() == "M":
return ((cmd, args), )
# Convert to quadratic if needed
if cmd.upper() == "Z":
# a line back to subpath start ... unless we are there already
if curr_xy == subpath_start:
return ()
cmd = "L"
args = subpath_start
if cmd == "L":
# line from curr_xy to args
assert len(args) == 2
end_xy = args
# quad ctl point 1/2 along
cmd = "Q"
args = (
*line_pos(0.5, curr_xy, end_xy),
*end_xy,
)
if cmd == "C":
cubic_points = [curr_xy] + [
tuple(args[i:i + 2]) for i in range(0, len(args), 2)
]
quad_points = cubic_to_quad(cubic_points, max_err)
quad_segments = []
for (control_pt, end_pt) in pathops.decompose_quadratic_segment(
tuple(quad_points[1:])):
quad_segments.append(("Q", (*control_pt, *end_pt)))
return tuple(quad_segments)
if cmd != "Q":
raise ValueError(f"How do you quad {cmd}, {args}")
assert len(args) == 4
return (("Q", args), )
def _qcurveto_to_svg(points) -> SVGCommandGen:
for (control_pt, end_pt) in pathops.decompose_quadratic_segment(points):
yield ("Q", control_pt + end_pt)
def qCurveTo(self, *points):
# handle TrueType quadratic splines with implicit on-curve mid-points
for (control_pt,
end_pt) in pathops.decompose_quadratic_segment(points):
self.path.Q(*control_pt, *end_pt)