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# Authors: see git history
#
# Copyright (c) 2010 Authors
# Licensed under the GNU GPL version 3.0 or later. See the file LICENSE for details.
import inkex
from shapely import concave_hull
from shapely.geometry import LineString, MultiPolygon
from ..i18n import _
from ..svg.tags import SVG_PATH_TAG
from .base import InkstitchExtension
class Outline(InkstitchExtension):
def __init__(self, *args, **kwargs):
InkstitchExtension.__init__(self, *args, **kwargs)
self.arg_parser.add_argument("-r", "--ratio", type=float, default=0.0, dest="ratio")
self.arg_parser.add_argument("-a", "--allow-holes", type=inkex.Boolean, default=False, dest="allow_holes")
def effect(self):
if not self.svg.selection:
inkex.errormsg(_("Please select one or more shapes to convert to their outline."))
return
for element in self.svg.selection:
self.element_to_outline(element)
def element_to_outline(self, element):
if element.tag_name == 'g':
for element in element.iterdescendants(SVG_PATH_TAG):
self.element_to_outline(element)
return
path = element.get_path()
path = path.end_points
hull = concave_hull(LineString(path), ratio=self.options.ratio, allow_holes=self.options.allow_holes)
if isinstance(hull, LineString):
return
if not isinstance(hull, MultiPolygon):
hull = MultiPolygon([hull])
d = ''
for geom in hull.geoms:
d += 'M '
for x, y in geom.exterior.coords:
d += f'{x}, {y} '
d += "Z"
element.set('d', d)
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