kopia lustrzana https://github.com/inkstitch/inkstitch
80 wiersze
3.7 KiB
Python
80 wiersze
3.7 KiB
Python
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from math import pi
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from inkex import DirectedLineSegment, Transform
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from shapely import geometry as shgeo
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from shapely.affinity import affine_transform, rotate
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from shapely.ops import split
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from ..svg import get_correction_transform
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def gradient_shapes_and_attributes(element, shape):
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# e.g. url(#linearGradient872) -> linearGradient872
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color = element.color[5:-1]
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xpath = f'.//svg:defs/svg:linearGradient[@id="{color}"]'
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gradient = element.node.getroottree().getroot().findone(xpath)
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gradient.apply_transform()
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point1 = (float(gradient.get('x1')), float(gradient.get('y1')))
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point2 = (float(gradient.get('x2')), float(gradient.get('y2')))
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# get 90° angle to calculate the splitting angle
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line = DirectedLineSegment(point1, point2)
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angle = line.angle - (pi / 2)
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# Ink/Stitch somehow turns the stitch angle
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stitch_angle = angle * -1
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# create bbox polygon to calculate the length necessary to make sure that
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# the gradient splitter lines will cut the entire design
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bbox = element.node.bounding_box()
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bbox_polygon = shgeo.Polygon([(bbox.left, bbox.top), (bbox.right, bbox.top),
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(bbox.right, bbox.bottom), (bbox.left, bbox.bottom)])
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# gradient stops
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offsets = gradient.stop_offsets
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stop_styles = gradient.stop_styles
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# now split the shape according to the gradient stops
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polygons = []
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colors = []
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attributes = []
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previous_color = None
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end_row_spacing = None
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for i, offset in enumerate(offsets):
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shape_rest = []
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split_point = shgeo.Point(line.point_at_ratio(float(offset)))
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length = split_point.hausdorff_distance(bbox_polygon)
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split_line = shgeo.LineString([(split_point.x - length - 2, split_point.y),
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(split_point.x + length + 2, split_point.y)])
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split_line = rotate(split_line, angle, origin=split_point, use_radians=True)
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transform = -Transform(get_correction_transform(element.node))
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transform = list(transform.to_hexad())
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split_line = affine_transform(split_line, transform)
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offset_line = split_line.parallel_offset(1, 'right')
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polygon = split(shape, split_line)
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color = stop_styles[i]['stop-color']
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# does this gradient line split the shape
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offset_outside_shape = len(polygon.geoms) == 1
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for poly in polygon.geoms:
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if isinstance(poly, shgeo.Polygon) and element.shape_is_valid(poly):
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if poly.intersects(offset_line):
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if previous_color:
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polygons.append(poly)
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colors.append(previous_color)
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attributes.append({'angle': stitch_angle, 'end_row_spacing': end_row_spacing, 'color': previous_color})
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polygons.append(poly)
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attributes.append({'angle': stitch_angle + pi, 'end_row_spacing': end_row_spacing, 'color': color})
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else:
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shape_rest.append(poly)
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shape = shgeo.MultiPolygon(shape_rest)
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previous_color = color
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end_row_spacing = element.row_spacing * 2
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# add left over shape(s)
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if shape:
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if offset_outside_shape:
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for s in shape.geoms:
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polygons.append(s)
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attributes.append({'color': stop_styles[-2]['stop-color'], 'angle': stitch_angle, 'end_row_spacing': end_row_spacing})
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stitch_angle += pi
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else:
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end_row_spacing = None
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for s in shape.geoms:
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polygons.append(s)
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attributes.append({'color': stop_styles[-1]['stop-color'], 'angle': stitch_angle, 'end_row_spacing': end_row_spacing})
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return polygons, attributes
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