kopia lustrzana https://github.com/inkstitch/inkstitch
263 wiersze
10 KiB
Python
263 wiersze
10 KiB
Python
from math import atan2, copysign
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from random import random
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import numpy as np
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import shapely.prepared
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from shapely import geometry as shgeo
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from shapely.affinity import translate
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from shapely.ops import linemerge, nearest_points, unary_union
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from ..debug import debug
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from ..stitch_plan import Stitch
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from ..utils.geometry import Point as InkstitchPoint
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from ..utils.geometry import (ensure_geometry_collection,
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ensure_multi_line_string, reverse_line_string)
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from .auto_fill import (auto_fill, build_fill_stitch_graph, build_travel_graph,
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collapse_sequential_outline_edges, find_stitch_path,
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graph_is_valid, travel)
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def guided_fill(shape,
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guideline,
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angle,
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row_spacing,
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num_staggers,
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max_stitch_length,
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running_stitch_length,
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running_stitch_tolerance,
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skip_last,
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starting_point,
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ending_point,
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underpath,
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strategy
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):
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segments = intersect_region_with_grating_guideline(shape, guideline, row_spacing, num_staggers, max_stitch_length, strategy)
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if not segments:
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return fallback(shape, guideline, row_spacing, max_stitch_length, running_stitch_length, running_stitch_tolerance,
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num_staggers, skip_last, starting_point, ending_point, underpath)
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fill_stitch_graph = build_fill_stitch_graph(shape, segments, starting_point, ending_point)
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if not graph_is_valid(fill_stitch_graph, shape, max_stitch_length):
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return fallback(shape, guideline, row_spacing, max_stitch_length, running_stitch_length, running_stitch_tolerance,
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num_staggers, skip_last, starting_point, ending_point, underpath)
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travel_graph = build_travel_graph(fill_stitch_graph, shape, angle, underpath)
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path = find_stitch_path(fill_stitch_graph, travel_graph, starting_point, ending_point)
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result = path_to_stitches(path, travel_graph, fill_stitch_graph, max_stitch_length, running_stitch_length, running_stitch_tolerance, skip_last)
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return result
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def fallback(shape, guideline, row_spacing, max_stitch_length, running_stitch_length, running_stitch_tolerance,
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num_staggers, skip_last, starting_point, ending_point, underpath):
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# fall back to normal auto-fill with an angle that matches the guideline (sorta)
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guide_start, guide_end = [guideline.coords[0], guideline.coords[-1]]
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angle = atan2(guide_end[1] - guide_start[1], guide_end[0] - guide_start[0]) * -1
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return auto_fill(shape, angle, row_spacing, None, max_stitch_length, running_stitch_length, running_stitch_tolerance,
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num_staggers, skip_last, starting_point, ending_point, underpath)
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def path_to_stitches(path, travel_graph, fill_stitch_graph, stitch_length, running_stitch_length, running_stitch_tolerance, skip_last):
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path = collapse_sequential_outline_edges(path)
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stitches = []
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# If the very first stitch is travel, we'll omit it in travel(), so add it here.
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if not path[0].is_segment():
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stitches.append(Stitch(*path[0].nodes[0]))
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for edge in path:
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if edge.is_segment():
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current_edge = fill_stitch_graph[edge[0]][edge[-1]]['segment']
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path_geometry = current_edge['geometry']
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if edge[0] != path_geometry.coords[0]:
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path_geometry = reverse_line_string(path_geometry)
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new_stitches = [Stitch(*point) for point in path_geometry.coords]
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# need to tag stitches
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if skip_last:
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del new_stitches[-1]
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stitches.extend(new_stitches)
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travel_graph.remove_edges_from(fill_stitch_graph[edge[0]][edge[1]]['segment'].get('underpath_edges', []))
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else:
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stitches.extend(travel(travel_graph, edge[0], edge[1], running_stitch_length, running_stitch_tolerance, skip_last))
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return stitches
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def extend_line(line, shape):
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(minx, miny, maxx, maxy) = shape.bounds
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upper_left = InkstitchPoint(minx, miny)
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lower_right = InkstitchPoint(maxx, maxy)
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length = (upper_left - lower_right).length()
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start_point = InkstitchPoint.from_tuple(line.coords[0])
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end_point = InkstitchPoint.from_tuple(line.coords[-1])
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direction = (end_point - start_point).unit()
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new_start_point = start_point - direction * length
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new_end_point = end_point + direction * length
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# without this, we seem especially likely to run into this libgeos bug:
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# https://github.com/shapely/shapely/issues/820
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new_start_point += InkstitchPoint(random() * 0.01, random() * 0.01)
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new_end_point += InkstitchPoint(random() * 0.01, random() * 0.01)
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return shgeo.LineString((new_start_point, *line.coords, new_end_point))
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def repair_multiple_parallel_offset_curves(multi_line):
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lines = ensure_multi_line_string(linemerge(multi_line))
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longest_line = max(lines.geoms, key=lambda line: line.length)
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# need simplify to avoid doubled points caused by linemerge
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return longest_line.simplify(0.01, False)
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def repair_non_simple_line(line):
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repaired = unary_union(line)
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counter = 0
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# Do several iterations since we might have several concatenated selfcrossings
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while repaired.geom_type != 'LineString' and counter < 4:
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line_segments = []
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for line_seg in repaired.geoms:
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if not line_seg.is_ring:
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line_segments.append(line_seg)
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repaired = unary_union(linemerge(line_segments))
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counter += 1
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if repaired.geom_type != 'LineString':
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# They gave us a line with complicated self-intersections. Use a fallback.
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return shgeo.LineString((line.coords[0], line.coords[-1]))
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else:
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return repaired
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def take_only_line_strings(thing):
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things = ensure_geometry_collection(thing)
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line_strings = [line for line in things.geoms if isinstance(line, shgeo.LineString)]
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return shgeo.MultiLineString(line_strings)
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def apply_stitches(line, max_stitch_length, num_staggers, row_spacing, row_num):
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start = (float(row_num % num_staggers) / num_staggers) * max_stitch_length
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projections = np.arange(start, line.length, max_stitch_length)
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points = np.array([line.interpolate(projection).coords[0] for projection in projections])
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stitched_line = shgeo.LineString(points)
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# stitched_line may round corners, which will look terrible. This finds the
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# corners.
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threshold = row_spacing / 2.0
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simplified_line = line.simplify(row_spacing / 2.0, False)
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simplified_points = [shgeo.Point(x, y) for x, y in simplified_line.coords]
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extra_points = []
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extra_point_projections = []
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for point in simplified_points:
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if point.distance(stitched_line) > threshold:
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extra_points.append(point.coords[0])
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extra_point_projections.append(line.project(point))
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# Now we need to insert the new points into their correct spots in the line.
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indices = np.searchsorted(projections, extra_point_projections)
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if len(indices) > 0:
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points = np.insert(points, indices, extra_points, axis=0)
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return shgeo.LineString(points)
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def prepare_guide_line(line, shape):
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if line.geom_type != 'LineString' or not line.is_simple:
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line = repair_non_simple_line(line)
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if line.is_ring:
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# If they pass us a ring, break it to avoid dividing by zero when
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# calculating a unit vector from start to end.
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line = shgeo.LineString(line.coords[:-2])
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# extend the end points away from each other
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line = extend_line(line, shape)
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return line
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def clean_offset_line(offset_line):
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offset_line = take_only_line_strings(offset_line)
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if isinstance(offset_line, shgeo.MultiLineString):
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offset_line = repair_multiple_parallel_offset_curves(offset_line)
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if not offset_line.is_simple:
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offset_line = repair_non_simple_line(offset_line)
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return offset_line
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def _get_start_row(line, shape, row_spacing, line_direction):
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if line.intersects(shape):
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return 0
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point1, point2 = nearest_points(line, shape.centroid)
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distance = point1.distance(point2)
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row = int(distance / row_spacing)
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# This flips the sign of the starting row if the shape is on the other side
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# of the guide line
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shape_direction = InkstitchPoint.from_shapely_point(point2) - InkstitchPoint.from_shapely_point(point1)
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return copysign(row, shape_direction * line_direction)
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def intersect_region_with_grating_guideline(shape, line, row_spacing, num_staggers, max_stitch_length, strategy):
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line = prepare_guide_line(line, shape)
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debug.log_line_string(shape.exterior, "guided fill shape")
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translate_direction = InkstitchPoint(*line.coords[-1]) - InkstitchPoint(*line.coords[0])
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translate_direction = translate_direction.unit().rotate_left()
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shape_envelope = shapely.prepared.prep(shape.convex_hull)
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start_row = _get_start_row(line, shape, row_spacing, translate_direction)
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row = start_row
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direction = 1
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offset_line = None
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rows = []
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while True:
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if strategy == 0:
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translate_amount = translate_direction * row * row_spacing
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offset_line = translate(line, xoff=translate_amount.x, yoff=translate_amount.y)
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elif strategy == 1:
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offset_line = line.parallel_offset(row * row_spacing, 'left', join_style=shgeo.JOIN_STYLE.round)
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offset_line = clean_offset_line(offset_line)
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if strategy == 1 and direction == -1:
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# negative parallel offsets are reversed, so we need to compensate
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offset_line = reverse_line_string(offset_line)
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debug.log_line_string(offset_line, f"offset {row}")
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stitched_line = apply_stitches(offset_line, max_stitch_length, num_staggers, row_spacing, row * direction)
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intersection = shape.intersection(stitched_line)
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if shape_envelope.intersects(stitched_line):
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for segment in take_only_line_strings(intersection).geoms:
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rows.append(segment.coords[:])
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row += direction
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else:
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if direction == 1:
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direction = -1
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row = start_row - 1
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else:
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break
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return rows
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