kopia lustrzana https://github.com/inkstitch/inkstitch
255 wiersze
8.6 KiB
Python
255 wiersze
8.6 KiB
Python
# Authors: see git history
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#
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# Copyright (c) 2010 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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import math
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import shapely
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from ..stitch_plan import Stitch
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from ..svg import PIXELS_PER_MM
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from ..utils import Point as InkstitchPoint
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from ..utils import cache
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from ..stitch_plan import Stitch
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def legacy_fill(shape, angle, row_spacing, end_row_spacing, max_stitch_length, flip, staggers, skip_last):
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rows_of_segments = intersect_region_with_grating(
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shape, angle, row_spacing, end_row_spacing, flip)
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groups_of_segments = pull_runs(rows_of_segments, shape, row_spacing)
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return [section_to_stitches(group, angle, row_spacing, max_stitch_length, staggers, skip_last)
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for group in groups_of_segments]
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@cache
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def east(angle):
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# "east" is the name of the direction that is to the right along a row
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return InkstitchPoint(1, 0).rotate(-angle)
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@cache
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def north(angle):
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return east(angle).rotate(math.pi / 2)
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def row_num(point, angle, row_spacing):
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return round((point * north(angle)) / row_spacing)
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def adjust_stagger(stitch, angle, row_spacing, max_stitch_length, staggers):
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this_row_num = row_num(stitch, angle, row_spacing)
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row_stagger = this_row_num % staggers
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stagger_offset = (float(row_stagger) / staggers) * max_stitch_length
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offset = ((stitch * east(angle)) - stagger_offset) % max_stitch_length
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return stitch - offset * east(angle)
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def stitch_row(stitches, beg, end, angle, row_spacing, max_stitch_length, staggers, skip_last=False):
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# We want our stitches to look like this:
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#
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# ---*-----------*-----------
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# ------*-----------*--------
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# ---------*-----------*-----
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# ------------*-----------*--
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# ---*-----------*-----------
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#
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# Each successive row of stitches will be staggered, with
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# num_staggers rows before the pattern repeats. A value of
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# 4 gives a nice fill while hiding the needle holes. The
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# first row is offset 0%, the second 25%, the third 50%, and
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# the fourth 75%.
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#
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# Actually, instead of just starting at an offset of 0, we
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# can calculate a row's offset relative to the origin. This
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# way if we have two abutting fill regions, they'll perfectly
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# tile with each other. That's important because we often get
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# abutting fill regions from pull_runs().
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beg = Stitch(*beg, tags=('fill_row_start',))
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end = Stitch(*end, tags=('fill_row_end',))
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row_direction = (end - beg).unit()
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segment_length = (end - beg).length()
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stitches.append(beg)
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first_stitch = adjust_stagger(
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beg, angle, row_spacing, max_stitch_length, staggers)
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# we might have chosen our first stitch just outside this row, so move back in
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if (first_stitch - beg) * row_direction < 0:
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first_stitch += row_direction * max_stitch_length
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offset = (first_stitch - beg).length()
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while offset < segment_length:
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stitches.append(
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Stitch(beg + offset * row_direction, tags=('fill_row')))
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offset += max_stitch_length
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if (end - stitches[-1]).length() > 0.1 * PIXELS_PER_MM and not skip_last:
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stitches.append(end)
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def intersect_region_with_grating(shape, angle, row_spacing, end_row_spacing=None, flip=False):
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# the max line length I'll need to intersect the whole shape is the diagonal
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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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half_length = length / 2.0
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# Now get a unit vector rotated to the requested angle. I use -angle
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# because shapely rotates clockwise, but my geometry textbooks taught
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# me to consider angles as counter-clockwise from the X axis.
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direction = InkstitchPoint(1, 0).rotate(-angle)
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# and get a normal vector
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normal = direction.rotate(math.pi / 2)
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# I'll start from the center, move in the normal direction some amount,
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# and then walk left and right half_length in each direction to create
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# a line segment in the grating.
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center = InkstitchPoint((minx + maxx) / 2.0, (miny + maxy) / 2.0)
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# I need to figure out how far I need to go along the normal to get to
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# the edge of the shape. To do that, I'll rotate the bounding box
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# angle degrees clockwise and ask for the new bounding box. The max
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# and min y tell me how far to go.
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_, start, _, end = shapely.affinity.rotate(
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shape, angle, origin='center', use_radians=True).bounds
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# convert start and end to be relative to center (simplifies things later)
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start -= center.y
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end -= center.y
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height = abs(end - start)
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# print >> dbg, "grating:", start, end, height, row_spacing, end_row_spacing
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# offset start slightly so that rows are always an even multiple of
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# row_spacing_px from the origin. This makes it so that abutting
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# fill regions at the same angle and spacing always line up nicely.
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start -= (start + normal * center) % row_spacing
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current_row_y = start
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while current_row_y < end:
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p0 = center + normal * current_row_y + direction * half_length
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p1 = center + normal * current_row_y - direction * half_length
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endpoints = [p0.as_tuple(), p1.as_tuple()]
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grating_line = shapely.geometry.LineString(endpoints)
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res = grating_line.intersection(shape)
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if (isinstance(res, shapely.geometry.MultiLineString) or isinstance(res, shapely.geometry.GeometryCollection)):
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runs = [line_string.coords for line_string in res.geoms if isinstance(line_string, shapely.geometry.LineString)]
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else:
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if res.is_empty or len(res.coords) == 1:
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# ignore if we intersected at a single point or no points
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runs = []
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else:
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runs = [res.coords]
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if runs:
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runs.sort(key=lambda seg: (
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InkstitchPoint(*seg[0]) - upper_left).length())
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if flip:
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runs.reverse()
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runs = [tuple(reversed(run)) for run in runs]
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yield from runs
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if end_row_spacing:
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current_row_y += row_spacing + \
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(end_row_spacing - row_spacing) * \
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((current_row_y - start) / height)
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else:
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current_row_y += row_spacing
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def section_to_stitches(group_of_segments, angle, row_spacing, max_stitch_length, staggers, skip_last):
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stitches = []
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swap = False
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for segment in group_of_segments:
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(beg, end) = segment
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if (swap):
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(beg, end) = (end, beg)
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stitch_row(stitches, beg, end, angle, row_spacing,
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max_stitch_length, staggers, skip_last)
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swap = not swap
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return stitches
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def make_quadrilateral(segment1, segment2):
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return shapely.geometry.Polygon((segment1[0], segment1[1], segment2[1], segment2[0], segment1[0]))
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def is_same_run(segment1, segment2, shape, row_spacing):
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line1 = shapely.geometry.LineString(segment1)
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line2 = shapely.geometry.LineString(segment2)
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if line1.distance(line2) > row_spacing * 1.1:
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return False
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quad = make_quadrilateral(segment1, segment2)
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quad_area = quad.area
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intersection_area = shape.intersection(quad).area
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return (intersection_area / quad_area) >= 0.9
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def pull_runs(rows, shape, row_spacing):
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# Given a list of rows, each containing a set of line segments,
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# break the area up into contiguous patches of line segments.
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#
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# This is done by repeatedly pulling off the first line segment in
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# each row and calling that a shape. We have to be careful to make
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# sure that the line segments are part of the same shape. Consider
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# the letter "H", with an embroidery angle of 45 degrees. When
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# we get to the bottom of the lower left leg, the next row will jump
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# over to midway up the lower right leg. We want to stop there and
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# start a new patch.
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# for row in rows:
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# print >> sys.stderr, len(row)
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# print >>sys.stderr, "\n".join(str(len(row)) for row in rows)
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runs = []
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count = 0
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while (len(rows) > 0):
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run = []
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prev = None
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for row_num in range(len(rows)):
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row = rows[row_num]
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first, rest = row[0], row[1:]
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# TODO: only accept actually adjacent rows here
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if prev is not None and not is_same_run(prev, first, shape, row_spacing):
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break
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run.append(first)
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prev = first
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rows[row_num] = rest
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# print >> sys.stderr, len(run)
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runs.append(run)
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rows = [r for r in rows if len(r) > 0]
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count += 1
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return runs
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