kopia lustrzana https://github.com/inkstitch/inkstitch
283 wiersze
12 KiB
Python
283 wiersze
12 KiB
Python
# Authors: see git history
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#
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# Copyright (c) 2022 Authors
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# Licensed under the GNU GPL version 3.0 or later. See the file LICENSE for details.
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from inkex import Boolean, Group, Path, PathElement, Transform, errormsg
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from inkex.units import convert_unit
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from shapely.geometry import LineString, MultiLineString, MultiPolygon, Point
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from shapely.ops import linemerge, nearest_points, split, voronoi_diagram
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from ..elements import FillStitch, Stroke
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from ..i18n import _
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from ..stitches.running_stitch import even_running_stitch
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from ..svg import get_correction_transform
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from ..utils import ensure_multi_line_string
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from ..utils.geometry import Point as InkstitchPoint
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from ..utils.geometry import line_string_to_point_list
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from .base import InkstitchExtension
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class FillToStroke(InkstitchExtension):
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def __init__(self, *args, **kwargs):
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InkstitchExtension.__init__(self, *args, **kwargs)
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self.arg_parser.add_argument("--options", dest="options", type=str, default="")
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self.arg_parser.add_argument("--info", dest="help", type=str, default="")
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self.arg_parser.add_argument("-t", "--threshold_mm", dest="threshold_mm", type=float, default=10)
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self.arg_parser.add_argument("-o", "--keep_original", dest="keep_original", type=Boolean, default=False)
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self.arg_parser.add_argument("-w", "--line_width_mm", dest="line_width_mm", type=float, default=1)
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self.arg_parser.add_argument("-g", "--close_gaps", dest="close_gaps", type=Boolean, default=False)
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def effect(self):
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if not self.svg.selected or not self.get_elements():
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errormsg(_("Please select one or more fill objects to render the centerline."))
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return
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fill_shapes, cut_lines, cut_line_nodes = self._get_shapes()
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if not fill_shapes:
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errormsg(_("Please select one or more fill objects to render the centerline."))
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return
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# convert user input from mm to px
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self.threshold = convert_unit(self.options.threshold_mm, 'px', 'mm')
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# convert to center line elements and insert into svg
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for element in fill_shapes:
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self._convert_to_centerline(element, cut_lines)
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# remove cut lines
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if not self.options.keep_original:
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self._remove_cutlines(cut_line_nodes)
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def _get_shapes(self):
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fill_shapes = []
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cut_lines = []
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cut_line_nodes = []
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for element in self.elements:
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if isinstance(element, FillStitch):
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fill_shapes.append(element)
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elif isinstance(element, Stroke):
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cut_lines.extend(list(element.as_multi_line_string().geoms))
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cut_line_nodes.append(element.node)
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return fill_shapes, cut_lines, cut_line_nodes
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def _convert_to_centerline(self, element, cut_lines):
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element_id = element.node.get_id()
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element_label = element.node.label
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group_name = element_label or element_id
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centerline_group = Group.new(f'{ group_name } { _("center line") }', id=self.uniqueId("centerline_group_"))
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parent = element.node.getparent()
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index = parent.index(element.node) + 1
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parent.insert(index, centerline_group)
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transform = Transform(get_correction_transform(parent, child=True))
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stroke_width = convert_unit(self.options.line_width_mm, 'px', 'mm')
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color = element.node.style('fill')
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style = f"fill:none;stroke:{ color };stroke-width:{ stroke_width }"
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multipolygon = element.shape
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multipolygon = self._apply_cut_lines(cut_lines, multipolygon)
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lines = self._get_lines(multipolygon)
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if self.options.close_gaps:
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lines = self._close_gaps(lines, cut_lines)
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# do not use a group in case there is only one line
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if len(lines) <= 1:
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parent.remove(centerline_group)
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centerline_group = parent
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# clean up
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if not self.options.keep_original:
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parent.remove(element.node)
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# insert new elements
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self._insert_elements(lines, centerline_group, index, element_id, element_label, transform, style)
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def _get_lines(self, multipolygon):
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lines = []
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for polygon in multipolygon.geoms:
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if polygon.area < 0.5:
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continue
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multilinestring = self._get_centerline(polygon)
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if multilinestring is None:
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continue
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lines.extend(multilinestring.geoms)
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return lines
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def _get_high_res_polygon(self, polygon):
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# use running stitch method
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runs = [even_running_stitch(line_string_to_point_list(polygon.exterior), 1, 0.1)]
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if len(runs[0]) < 3:
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return
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for interior in polygon.interiors:
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shape = even_running_stitch(line_string_to_point_list(interior), 1, 0.1)
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if len(shape) >= 3:
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runs.append(shape)
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return MultiPolygon([(runs[0], runs[1:])])
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def _get_centerline(self, polygon):
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# increase the resolution of the polygon
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polygon = self._get_high_res_polygon(polygon)
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if polygon is polygon.geom_type == 'MultiPolygon':
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return
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# generate voronoi centerline
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multilinestring = self._get_voronoi_centerline(polygon)
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if multilinestring is None:
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return
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# dead ends
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dead_ends = self._get_dead_end_lines(multilinestring)
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# avoid the splitting of line ends
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multilinestring = self._repair_splitted_ends(polygon, multilinestring, dead_ends)
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# update dead ends
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dead_ends = self._get_dead_end_lines(multilinestring)
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# filter small dead ends
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multilinestring = self._filter_short_dead_ends(multilinestring, dead_ends)
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if multilinestring is None:
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return
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# simplify polygon
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multilinestring = ensure_multi_line_string(multilinestring.simplify(0.1))
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if multilinestring is None:
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return
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return multilinestring
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def _get_voronoi_centerline(self, polygon):
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lines = voronoi_diagram(polygon, edges=True).geoms[0]
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if not lines.geom_type == 'MultiLineString':
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return
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multilinestring = []
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for line in lines.geoms:
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if polygon.covers(line):
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multilinestring.append(line)
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lines = linemerge(multilinestring)
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if lines.is_empty:
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return
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return ensure_multi_line_string(lines)
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def _apply_cut_lines(self, cut_lines, multipolygon):
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for cut_line in cut_lines:
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split_polygon = split(multipolygon, cut_line)
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poly = [polygon for polygon in split_polygon.geoms if polygon.geom_type == 'Polygon']
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multipolygon = MultiPolygon(poly)
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return multipolygon
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def _get_start_and_end_points(self, multilinestring):
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points = []
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for line in multilinestring.geoms:
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points.extend(line.coords[::len(line.coords)-1])
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return points
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def _get_dead_end_lines(self, multilinestring):
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start_and_end_points = self._get_start_and_end_points(multilinestring)
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dead_ends = []
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for line in multilinestring.geoms:
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num_neighbours_start = start_and_end_points.count(line.coords[0]) - 1
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num_neighbours_end = start_and_end_points.count(line.coords[-1]) - 1
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if num_neighbours_start == 0 or num_neighbours_end == 0:
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dead_ends.append(line)
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return dead_ends
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def _filter_short_dead_ends(self, multilinestring, dead_ends):
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lines = list(multilinestring.geoms)
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for i, line in enumerate(multilinestring.geoms):
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if line in dead_ends and line.length < self.threshold:
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lines.remove(line)
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lines = linemerge(lines)
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if lines.is_empty:
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lines = None
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else:
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lines = ensure_multi_line_string(lines)
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return lines
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def _repair_splitted_ends(self, polygon, multilinestring, dead_ends):
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lines = list(multilinestring.geoms)
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for i, dead_end in enumerate(dead_ends):
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if dead_end.length > self.threshold:
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continue
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self._join_end(polygon, lines, dead_ends, dead_end, i)
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return ensure_multi_line_string(linemerge(lines))
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def _join_end(self, polygon, lines, dead_ends, dead_end, index):
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coords = dead_end.coords
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for j in range(index + 1, len(dead_ends)):
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if dead_ends[j].length > self.threshold:
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continue
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common_point = set([coords[0], coords[-1]]).intersection(dead_ends[j].coords)
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if len(common_point) > 0:
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dead_point1 = coords[0]
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if dead_point1 in common_point:
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dead_point1 = coords[-1]
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dead_point2 = dead_ends[j].coords[0]
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if dead_point2 in common_point:
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dead_point2 = dead_ends[j].coords[-1]
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end_line = LineString([dead_point1, dead_point2])
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if polygon.covers(end_line):
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dead_end_center_point = end_line.centroid
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else:
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continue
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lines.append(LineString([dead_end_center_point, list(common_point)[0]]))
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if dead_end in lines:
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lines.remove(dead_end)
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if dead_ends[j] in lines:
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lines.remove(dead_ends[j])
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continue
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def _close_gaps(self, lines, cut_lines):
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snaped_lines = []
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lines = MultiLineString(lines)
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for i, line in enumerate(lines.geoms):
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# for each cutline check if a line starts or ends close to it
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# if so extend the line at the start/end for the distance of the nearest point and snap it to that other line
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# we do not want to snap it to the rest of the lines directly, this could push the connection point into an unwanted direction
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coords = list(line.coords)
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start = Point(coords[0])
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end = Point(coords[-1])
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l_l = lines.difference(line)
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for cut_line in cut_lines:
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distance = start.distance(l_l)
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if cut_line.distance(start) < 0.6:
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distance = start.distance(l_l)
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new_start_point = self._extend_line(line.coords[0], line.coords[1], distance)
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coords[0] = nearest_points(Point(list(new_start_point)), l_l)[1]
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if cut_line.distance(end) < 0.6:
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distance = end.distance(l_l)
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new_end_point = self._extend_line(line.coords[-1], line.coords[-2], distance)
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coords[-1] = nearest_points(Point(list(new_end_point)), l_l)[1]
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snaped_lines.append(LineString(coords))
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return snaped_lines
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def _extend_line(self, p1, p2, distance):
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start_point = InkstitchPoint.from_tuple(p1)
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end_point = InkstitchPoint.from_tuple(p2)
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direction = (end_point - start_point).unit()
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new_point = start_point - direction * distance
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return new_point
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def _remove_cutlines(self, cut_line_nodes):
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for cut_line in cut_line_nodes:
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# it is possible, that we get one element twice (if it has both, a fill and a stroke)
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# this means that we already removed it from the svg and we can ignore the error.
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try:
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cut_line.getparent().remove(cut_line)
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except AttributeError:
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pass
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def _insert_elements(self, lines, parent, index, element_id, element_label, transform, style):
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replace = False if len(lines) > 1 or self.options.keep_original else True
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for i, line in enumerate(lines):
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line_id = element_id if replace else self.uniqueId(f"{ element_id }_")
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centerline_element = PathElement(
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id=line_id,
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d=str(Path(line.coords)),
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style=style,
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transform=str(transform)
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)
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if element_label is not None:
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label = element_label if replace else f"{ element_label }_{ i }"
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centerline_element.label = label
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parent.insert(index, centerline_element)
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