kopia lustrzana https://github.com/inkstitch/inkstitch
254 wiersze
8.6 KiB
Python
254 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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from math import pi
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import inkex
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from ..i18n import _
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from ..utils import Point, cache
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from .tags import INKSCAPE_GROUPMODE, INKSCAPE_LABEL, INKSTITCH_ATTRIBS
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from .units import PIXELS_PER_MM, get_viewbox_transform
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# The stitch vector path looks like this:
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# _______
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# (_______)
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#
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# It's 0.32mm high, which is the approximate thickness of common machine
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# embroidery threads.
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# 1.398 pixels = 0.37mm
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stitch_height = 1.398
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# This vector path starts at the upper right corner of the stitch shape and
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# proceeds counter-clockwise and contains a placeholder (%s) for the stitch
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# length.
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#
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# It contains four invisible "whiskers" of zero width that go outwards
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# to ensure that the SVG renderer allocates a large enough canvas area when
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# computing the gaussian blur steps:
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# \_____/
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# (_____) (whiskers not to scale)
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# / \
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# This is necessary to avoid artifacting near the edges and corners that seems to be due to
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# edge conditions for the feGaussianBlur, which is used to build the heightmap for
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# the feDiffuseLighting node. So we need some extra buffer room around the shape.
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# The whiskers let us specify a "fixed" amount of spacing around the stitch.
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# Otherwise, we'd have to expand the width and height attributes of the <filter>
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# tag to add more buffer space. The filter's width and height are specified in multiples of
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# the bounding box size, It's the bounding box aligned with the global SVG canvas's axes,
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# not the axes of the stitch itself. That means that having a big enough value
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# to add enough padding on the long sides of the stitch would waste a ton
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# of space on the short sides and significantly slow down rendering.
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# The specific extent of the whiskers (0.55 parallel to the stitch, 0.1 perpendicular)
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# was found by experimentation. It seems to work with almost no artifacting.
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stitch_path = (
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"M0,0" # Start point
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"l0.55,-0.1,-0.55,0.1" # Bottom-right whisker
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"c0.613,0,0.613,1.4,0,1.4" # Right endcap
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"l0.55,0.1,-0.55,-0.1" # Top-right whisker
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"h-%s" # Stitch length
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"l-0.55,0.1,0.55,-0.1" # Top-left whisker
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"c-0.613,0,-0.613,-1.4,0,-1.4" # Left endcap
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"l-0.55,-0.1,0.55,0.1" # Bottom-left whisker
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"z") # return to start
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# The filter needs the xmlns:inkscape declaration, or Inkscape will display a parse error
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# "Namespace prefix inkscape for auto-region on filter is not defined"
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# Even when the document itself has the namespace, go figure.
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realistic_filter = """
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<filter
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style="color-interpolation-filters:sRGB"
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id="realistic-stitch-filter"
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x="0"
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width="1"
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y="0"
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height="1"
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inkscape:auto-region="false"
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xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">
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<feGaussianBlur
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edgeMode="none"
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stdDeviation="0.9"
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id="feGaussianBlur1542-6"
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in="SourceAlpha" />
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<feSpecularLighting
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id="feSpecularLighting1973"
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result="result2"
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surfaceScale="1.5"
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specularConstant="0.78"
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specularExponent="2.5">
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<feDistantLight
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id="feDistantLight1975"
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azimuth="-125"
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elevation="20" />
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</feSpecularLighting>
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<feComposite
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in2="SourceAlpha"
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id="feComposite1981"
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operator="atop" />
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<feComposite
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in2="SourceGraphic"
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id="feComposite1982"
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operator="arithmetic"
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k2="0.8"
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k3="1.2"
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result="result3"
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k1="0"
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k4="0" />
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</filter>
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"""
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def realistic_stitch(start, end):
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"""Generate a stitch vector path given a start and end point."""
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end = Point(*end)
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start = Point(*start)
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stitch_length = (end - start).length()
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stitch_center = Point((end.x+start.x)/2.0, (end[1]+start[1])/2.0)
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stitch_direction = (end - start)
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stitch_angle = math.atan2(stitch_direction.y, stitch_direction.x) * (180 / pi)
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stitch_length = max(0, stitch_length - 0.2 * PIXELS_PER_MM)
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# rotate the path to match the stitch
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rotation_center_x = -stitch_length / 2.0
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rotation_center_y = stitch_height / 2.0
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transform = (
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inkex.Transform()
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.add_translate(stitch_center.x - rotation_center_x, stitch_center.y - rotation_center_y)
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.add_rotate(stitch_angle, (rotation_center_x, rotation_center_y))
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)
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# create the path by filling in the length in the template, and transforming it as above
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path = inkex.Path(stitch_path % stitch_length).transform(transform, True)
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return str(path)
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def color_block_to_point_lists(color_block):
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point_lists = [[]]
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for stitch in color_block:
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if stitch.trim:
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if point_lists[-1]:
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point_lists.append([])
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continue
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if not stitch.jump and not stitch.color_change and not stitch.stop:
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point_lists[-1].append(stitch.as_tuple())
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# filter out empty point lists
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point_lists = [p for p in point_lists if len(p) > 1]
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return point_lists
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@cache
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def get_correction_transform(svg):
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transform = get_viewbox_transform(svg)
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# we need to correct for the viewbox
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transform = -inkex.transforms.Transform(transform)
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return str(transform)
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def color_block_to_realistic_stitches(color_block, svg, destination):
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for point_list in color_block_to_point_lists(color_block):
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color = color_block.color.visible_on_white.darker.to_hex_str()
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start = point_list[0]
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for point in point_list[1:]:
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destination.append(inkex.PathElement(attrib={
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'style': "fill: %s; stroke: none; filter: url(#realistic-stitch-filter);" % color,
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'd': realistic_stitch(start, point),
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'transform': get_correction_transform(svg)
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}))
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start = point
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def color_block_to_paths(color_block, svg, destination, visual_commands):
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# If we try to import these above, we get into a mess of circular
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# imports.
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from ..commands import add_commands
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from ..elements.stroke import Stroke
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# We could emit just a single path with one subpath per point list, but
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# emitting multiple paths makes it easier for the user to manipulate them.
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first = True
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path = None
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for point_list in color_block_to_point_lists(color_block):
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if first:
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first = False
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elif visual_commands:
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add_commands(Stroke(destination[-1]), ["trim"])
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else:
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path.set(INKSTITCH_ATTRIBS['trim_after'], 'true')
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color = color_block.color.visible_on_white.to_hex_str()
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path = inkex.PathElement(attrib={
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'id': svg.get_unique_id("object"),
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'style': "stroke: %s; stroke-width: 0.4; fill: none;" % color,
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'd': "M" + " ".join(" ".join(str(coord) for coord in point) for point in point_list),
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'transform': get_correction_transform(svg),
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INKSTITCH_ATTRIBS['stroke_method']: 'manual_stitch'
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})
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destination.append(path)
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if path is not None and color_block.trim_after:
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if visual_commands:
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add_commands(Stroke(path), ["trim"])
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else:
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path.set(INKSTITCH_ATTRIBS['trim_after'], 'true')
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if path is not None and color_block.stop_after:
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if visual_commands:
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add_commands(Stroke(path), ["stop"])
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else:
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path.set(INKSTITCH_ATTRIBS['stop_after'], 'true')
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def render_stitch_plan(svg, stitch_plan, realistic=False, visual_commands=True) -> inkex.Group:
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layer = svg.findone(".//*[@id='__inkstitch_stitch_plan__']")
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if layer is None:
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layer = inkex.Group(attrib={
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'id': '__inkstitch_stitch_plan__',
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INKSCAPE_LABEL: _('Stitch Plan'),
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INKSCAPE_GROUPMODE: 'layer'
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})
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else:
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# delete old stitch plan
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del layer[:]
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# make sure the layer is visible
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layer.set('style', 'display:inline')
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svg.append(layer)
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for i, color_block in enumerate(stitch_plan):
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group = inkex.Group(attrib={
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'id': '__color_block_%d__' % i,
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INKSCAPE_LABEL: "color block %d" % (i + 1)
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})
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layer.append(group)
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if realistic:
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color_block_to_realistic_stitches(color_block, svg, group)
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else:
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color_block_to_paths(color_block, svg, group, visual_commands)
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if realistic:
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# Remove filter from defs, if any
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filter: inkex.BaseElement = svg.defs.findone("//*[@id='realistic-stitch-filter']")
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if filter is not None:
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svg.defs.remove(filter)
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filter_document = inkex.load_svg(realistic_filter)
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svg.defs.append(filter_document.getroot())
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return layer
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