kopia lustrzana https://github.com/inkstitch/inkstitch
309 wiersze
11 KiB
Python
309 wiersze
11 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 collections import defaultdict
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import inkex
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import networkx as nx
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from shapely.geometry import LineString, MultiLineString, MultiPoint, Point
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from shapely.ops import nearest_points, substring, unary_union
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from ..commands import add_commands
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from ..elements import Stroke
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from ..i18n import _
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from ..svg import PIXELS_PER_MM, generate_unique_id
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from ..svg.tags import INKSCAPE_LABEL, INKSTITCH_ATTRIBS
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from ..utils.threading import check_stop_flag
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from .utils.autoroute import (add_elements_to_group, add_jumps,
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create_new_group, find_path,
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get_starting_and_ending_nodes,
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preserve_original_groups,
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remove_original_elements)
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class LineSegments:
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'''
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Takes elements and splits them into segments.
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Attributes:
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_lines -- a list of LineStrings from the subpaths of the Stroke elements
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_elements -- a list of Stroke elements for each corresponding line in _lines
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_intersection_points -- a dictionary with intersection points {line_index: [intersection_points]}
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segments -- (public) a list of segments and corresponding elements [[segment, element], ...]
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'''
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def __init__(self, elements):
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self._lines = []
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self._elements = []
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self._intersection_points = defaultdict(list)
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self.segments = []
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self._process_elements(elements)
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self._get_intersection_points()
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self._get_segments()
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def _process_elements(self, elements):
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for element in elements:
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lines = element.as_multi_line_string().geoms
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for line in lines:
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# split at self-intersections if necessary
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unary_lines = unary_union(line)
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if isinstance(unary_lines, MultiLineString):
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for unary_line in unary_lines.geoms:
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self._lines.append(unary_line)
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self._elements.append(element)
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else:
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self._lines.append(line)
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self._elements.append(element)
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check_stop_flag()
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def _get_intersection_points(self):
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for i, line1 in enumerate(self._lines):
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for j in range(i + 1, len(self._lines)):
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check_stop_flag()
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line2 = self._lines[j]
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distance = line1.distance(line2)
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if distance > 50:
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continue
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if not distance == 0:
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# add nearest points
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near = nearest_points(line1, line2)
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self._add_point(i, near[0])
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self._add_point(j, near[1])
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# add intersections
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intersections = line1.intersection(line2)
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if isinstance(intersections, Point):
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self._add_point(i, intersections)
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self._add_point(j, intersections)
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elif isinstance(intersections, MultiPoint):
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for point in intersections.geoms:
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self._add_point(i, point)
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self._add_point(j, point)
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elif isinstance(intersections, LineString):
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for point in intersections.coords:
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self._add_point(i, Point(*point))
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self._add_point(j, Point(*point))
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def _add_point(self, element, point):
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self._intersection_points[element].append(point)
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def _get_segments(self):
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'''
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Splits elements into segments at intersection and "almost intersecions".
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The split method would make this very easy (it can split a MultiString with
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MultiPoints) but sadly it fails too often, while snap moves the points away
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from where we want them. So we need to calculate the distance along the line
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and finally split it into segments with shapelys substring method.
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'''
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self.segments = []
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for i, line in enumerate(self._lines):
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length = line.length
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points = self._intersection_points[i]
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distances = [0, length]
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for point in points:
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distances.append(line.project(point))
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distances = sorted(set(distances))
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for j in range(len(distances) - 1):
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start = distances[j]
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end = distances[j + 1]
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if end - start > 0.1:
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seg = substring(line, start, end)
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self.segments.append([seg, self._elements[i]])
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def autorun(elements, preserve_order=False, break_up=None, starting_point=None, ending_point=None, trim=False):
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graph = build_graph(elements, preserve_order, break_up)
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graph = add_jumps(graph, elements, preserve_order)
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starting_point, ending_point = get_starting_and_ending_nodes(
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graph, elements, preserve_order, starting_point, ending_point)
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path = find_path(graph, starting_point, ending_point)
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path = add_path_attribs(path)
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new_elements, trims, original_parents = path_to_elements(graph, path, trim)
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if preserve_order:
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preserve_original_groups(new_elements, original_parents)
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else:
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parent = elements[0].node.getparent()
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insert_index = parent.index(elements[0].node)
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group = create_new_group(parent, insert_index, _("Auto-Route"))
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add_elements_to_group(new_elements, group)
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if trim:
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add_trims(new_elements, trims)
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remove_original_elements(elements)
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def build_graph(elements, preserve_order, break_up):
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if preserve_order:
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graph = nx.DiGraph()
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else:
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graph = nx.Graph()
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if not break_up:
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segments = []
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for element in elements:
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line_strings = [[line, element] for line in element.as_multi_line_string().geoms]
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segments.extend(line_strings)
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else:
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segments = LineSegments(elements).segments
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for segment, element in segments:
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for c1, c2 in zip(segment.coords[:-1], segment.coords[1:]):
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start = Point(*c1)
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end = Point(*c2)
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graph.add_node(str(start), point=start)
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graph.add_node(str(end), point=end)
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graph.add_edge(str(start), str(end), element=element)
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if preserve_order:
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# The graph is a directed graph, but we want to allow travel in
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# any direction, so we add the edge in the opposite direction too.
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graph.add_edge(str(end), str(start), element=element)
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check_stop_flag()
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return graph
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def add_path_attribs(path):
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# find_path() will have duplicated some of the edges in the graph. We don't
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# want to sew the same running stitch twice. If a running stitch section appears
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# twice in the path, we'll sew the first occurrence as a simple running stitch without
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# the original running stitch repetitions and bean stitch settings.
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seen = set()
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for i, point in reversed(list(enumerate(path))):
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if point in seen:
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path[i] = (*point, "underpath")
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else:
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path[i] = (*point, "autorun")
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seen.add(point)
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seen.add((point[1], point[0]))
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return path
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def path_to_elements(graph, path, trim): # noqa: C901
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element_list = []
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original_parents = []
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trims = []
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d = ""
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position = 0
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path_direction = "autorun"
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just_trimmed = False
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el = None
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for start, end, direction in path:
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check_stop_flag()
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try:
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element = graph[start][end].get('element')
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except KeyError:
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# runs with the preserve order option may need this
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element = graph[end][start].get('element')
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start_coord = graph.nodes[start]['point']
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end_coord = graph.nodes[end]['point']
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# create a new element if we hit an other original element to keep it's properties
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if el and element and el != element and d and not direction == 'underpath':
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element_list.append(create_element(d, position, path_direction, el))
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original_parents.append(el.node.getparent())
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d = ""
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position += 1
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if element:
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el = element
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if just_trimmed:
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if direction == "underpath":
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# no sense in doing underpath after we trim
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continue
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else:
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just_trimmed = False
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# create a new element if direction (purpose) changes
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if direction != path_direction:
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if d:
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element_list.append(create_element(d, position, path_direction, el))
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original_parents.append(el.node.getparent())
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d = ""
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position += 1
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path_direction = direction
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if d == "":
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d = "M %s %s, %s %s" % (start_coord.x, start_coord.y, end_coord.x, end_coord.y)
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else:
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d += ", %s %s" % (end_coord.x, end_coord.y)
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elif el and d:
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# this is a jump, so complete the element whose path we've been building
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element_list.append(create_element(d, position, path_direction, el))
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original_parents.append(el.node.getparent())
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d = ""
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if trim and start_coord.distance(end_coord) > 0.75 * PIXELS_PER_MM:
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trims.append(position)
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just_trimmed = True
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position += 1
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if d:
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element_list.append(create_element(d, position, path_direction, el))
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original_parents.append(el.node.getparent())
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return element_list, trims, original_parents
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def create_element(path, position, direction, element):
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if not path:
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return
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el_id = "%s_%s_" % (direction, position)
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index = position + 1
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if direction == "autorun":
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label = _("AutoRun %d") % index
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else:
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label = _("AutoRun Underpath %d") % index
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node = inkex.PathElement()
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node.set("id", generate_unique_id(element.node, el_id))
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node.set(INKSCAPE_LABEL, label)
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node.set("d", path)
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node.set("style", element.node.style)
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# Set Ink/Stitch attributes
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stitch_length = element.node.get(INKSTITCH_ATTRIBS['running_stitch_length_mm'], '')
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tolerance = element.node.get(INKSTITCH_ATTRIBS['running_stitch_tolerance_mm'], '')
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repeats = int(element.node.get(INKSTITCH_ATTRIBS['repeats'], 1))
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if repeats % 2 == 0:
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repeats -= 1
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if direction == "autorun":
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for attrib in element.node.attrib:
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if attrib.startswith(inkex.NSS['inkstitch'], 1):
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if attrib == INKSTITCH_ATTRIBS['repeats']:
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node.set(INKSTITCH_ATTRIBS['repeats'], str(repeats))
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else:
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node.set(attrib, element.node.get(attrib))
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else:
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if stitch_length:
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node.set(INKSTITCH_ATTRIBS['running_stitch_length_mm'], stitch_length)
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if tolerance:
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node.set(INKSTITCH_ATTRIBS['running_stitch_tolerance_mm'], tolerance)
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node.set("style", element.node.style + inkex.Style("stroke-dasharray:0.5,0.5;fill:none;"))
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return Stroke(node)
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def add_trims(elements, trim_indices):
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for i in trim_indices:
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add_commands(elements[i], ["trim"])
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