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# Authors: see git history
#
# Copyright (c) 2010 Authors
# Licensed under the GNU GPL version 3.0 or later. See the file LICENSE for details.
import inkex
from shapely import geometry as shgeo
import math
from .svg.tags import EMBROIDERABLE_TAGS
from .utils import Point
def is_pattern(node):
if node.tag not in EMBROIDERABLE_TAGS:
return False
style = node.get('style') or ''
return "marker-start:url(#inkstitch-pattern-marker)" in style
def apply_patterns(patches, node):
patterns = _get_patterns(node)
_apply_stroke_patterns(patterns['stroke_patterns'], patches)
_apply_fill_patterns(patterns['fill_patterns'], patches)
def _apply_stroke_patterns(patterns, patches):
for pattern in patterns:
for patch in patches:
patch_points = []
for i, stitch in enumerate(patch.stitches):
patch_points.append(stitch)
if i == len(patch.stitches) - 1:
continue
intersection_points = _get_pattern_points(stitch, patch.stitches[i+1], pattern)
for point in intersection_points:
patch_points.append(point)
patch.stitches = patch_points
def _apply_fill_patterns(patterns, patches):
for pattern in patterns:
for patch in patches:
patch_points = []
for i, stitch in enumerate(patch.stitches):
# keep points outside the fill patter
if not shgeo.Point(stitch).within(pattern):
patch_points.append(stitch)
# keep start and end points
elif i - 1 < 0 or i >= len(patch.stitches) - 1:
patch_points.append(stitch)
# keep points if they have an angle
# the necessary angle can be variable with certain stitch types (later on)
# but they don't need to use filled patterns for those
elif not 179 < get_angle(patch.stitches[i-1], stitch, patch.stitches[i+1]) < 181:
patch_points.append(stitch)
patch.stitches = patch_points
def _get_patterns(node):
from .elements import EmbroideryElement
from .elements.fill import Fill
from .elements.stroke import Stroke
fills = []
strokes = []
xpath = "./parent::svg:g/*[contains(@style, 'marker-start:url(#inkstitch-pattern-marker)')]"
patterns = node.xpath(xpath, namespaces=inkex.NSS)
for pattern in patterns:
if pattern.tag not in EMBROIDERABLE_TAGS:
continue
element = EmbroideryElement(pattern)
fill = element.get_style('fill')
stroke = element.get_style('stroke')
if fill is not None:
fill_pattern = Fill(pattern).shape
fills.append(fill_pattern)
if stroke is not None:
stroke_pattern = Stroke(pattern).paths
line_strings = [shgeo.LineString(path) for path in stroke_pattern]
strokes.append(shgeo.MultiLineString(line_strings))
return {'fill_patterns': fills, 'stroke_patterns': strokes}
def _get_pattern_points(first, second, pattern):
points = []
intersection = shgeo.LineString([first, second]).intersection(pattern)
if isinstance(intersection, shgeo.Point):
points.append(Point(intersection.x, intersection.y))
if isinstance(intersection, shgeo.MultiPoint):
for point in intersection:
points.append(Point(point.x, point.y))
# sort points after their distance to first
points.sort(key=lambda point: point.distance(first))
return points
def get_angle(a, b, c):
ang = math.degrees(math.atan2(c[1]-b[1], c[0]-b[0]) - math.atan2(a[1]-b[1], a[0]-b[0]))
return ang + 360 if ang < 0 else ang
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