def _extract_paths(group: svgelements.Group, recursive) -> _PathListType:
"""Extract everything from the provided SVG group."""
if recursive:
everything = group.select()
else:
everything = group
paths = []
for elem in everything:
if hasattr(elem, "values") and elem.values.get("visibility", "") in (
"hidden",
"collapse",
):
continue
if isinstance(elem, svgelements.Path):
if len(elem) != 0:
paths.append(elem)
elif isinstance(elem, (svgelements.Polyline, svgelements.Polygon)):
# Here we add a "fake" path containing just the Polyline/Polygon,
# to be treated specifically by _convert_flattened_paths.
path = [svgelements.Move(elem.points[0]), elem]
if isinstance(elem, svgelements.Polygon):
path.append(svgelements.Close(elem.points[-1], elem.points[0]))
paths.append(path)
elif isinstance(elem, svgelements.Shape):
e = svgelements.Path(elem)
e.reify(
) # In some cases the shape could not have reified, the path must.
if len(e) != 0:
paths.append(e)
return paths
def path_to_polylines(path_or_svgd, start=0j, tolerance=0.1):
def subdivide_cubicBezier(cubic):
for x, y in islice(
aggsubdivision.bezier(
(cubic.start.real, cubic.start.imag),
(cubic.control1.real, cubic.control1.imag),
(cubic.control2.real, cubic.control2.imag),
(cubic.end.real, cubic.end.imag),
distance_tolerance=tolerance), 1, None):
yield complex(x, y)
def subpath_to_polyline(subpath):
for seg in subpath:
if isinstance(seg, svgelements.Move):
yield complex(*seg.end)
elif isinstance(seg, svgelements.Line):
yield complex(*seg.end)
elif isinstance(seg, svgelements.CubicBezier):
yield from subdivide_cubicBezier(seg)
elif isinstance(seg, svgelements.QuadraticBezier):
cubic = svgelements.CubicBezier(
seg.start, 1 / 3 * seg.start + 2 / 3 * seg.control,
2 / 3 * seg.control + 1 / 3 * seg.end, seg.end)
yield from subdivide_cubicBezier(cubic)
elif isinstance(seg, svgelements.Arc):
for cubic in seg.as_cubic_curves():
yield from subdivide_cubicBezier(cubic)
elif isinstance(seg, svgelements.Close):
yield complex(*seg.end)
else:
logging.warn('unimplemented segement type %s', type(seg))
if isinstance(path_or_svgd, svgelements.Path):
path = path_or_svgd
else:
path = svgelements.Path()
path.append(svgelements.Move(start))
path.parse(path_or_svgd)
path.pop(0)
for subpath in path.as_subpaths():
if subpath:
yield list(subpath_to_polyline(subpath))