645 lines
21 KiB
Python
645 lines
21 KiB
Python
# ########################################################## ##
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# FlatCAM: 2D Post-processing for Manufacturing #
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# http://flatcam.org #
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# Author: Juan Pablo Caram (c) #
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# Date: 12/18/2015 #
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# MIT Licence #
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# #
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# SVG Features supported: #
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# * Groups #
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# * Rectangles (w/ rounded corners) #
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# * Circles #
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# * Ellipses #
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# * Polygons #
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# * Polylines #
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# * Lines #
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# * Paths #
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# * All transformations #
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# #
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# Reference: www.w3.org/TR/SVG/Overview.html #
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# ########################################################## ##
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# import xml.etree.ElementTree as ET
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from svg.path import Line, Arc, CubicBezier, QuadraticBezier, parse_path
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from svg.path.path import Move
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from shapely.geometry import LineString
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from shapely.affinity import skew, affine_transform
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import numpy as np
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from flatcamParsers.ParseFont import *
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log = logging.getLogger('base2')
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def svgparselength(lengthstr):
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"""
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Parse an SVG length string into a float and a units
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string, if any.
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:param lengthstr: SVG length string.
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:return: Number and units pair.
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:rtype: tuple(float, str|None)
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"""
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integer_re_str = r'[+-]?[0-9]+'
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number_re_str = r'(?:[+-]?[0-9]*\.[0-9]+(?:[Ee]' + integer_re_str + ')?' + r')|' + \
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r'(?:' + integer_re_str + r'(?:[Ee]' + integer_re_str + r')?)'
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length_re_str = r'(' + number_re_str + r')(em|ex|px|in|cm|mm|pt|pc|%)?'
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match = re.search(length_re_str, lengthstr)
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if match:
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return float(match.group(1)), match.group(2)
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return
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def path2shapely(path, object_type, res=1.0):
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"""
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Converts an svg.path.Path into a Shapely
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Polygon or LinearString.
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:rtype : Polygon
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:rtype : LineString
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:param path: svg.path.Path instance
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:param res: Resolution (minimum step along path)
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:return: Shapely geometry object
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"""
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points = []
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geometry = []
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geo_element = None
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rings = []
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for component in path:
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# Line
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if isinstance(component, Line):
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start = component.start
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x, y = start.real, start.imag
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if len(points) == 0 or points[-1] != (x, y):
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points.append((x, y))
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end = component.end
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points.append((end.real, end.imag))
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continue
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# Arc, CubicBezier or QuadraticBezier
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if isinstance(component, Arc) or \
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isinstance(component, CubicBezier) or \
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isinstance(component, QuadraticBezier):
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# How many points to use in the discrete representation.
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length = component.length(res / 10.0)
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steps = int(length / res + 0.5)
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# solve error when step is below 1,
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# it may cause other problems, but LineString needs at least two points
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if steps == 0:
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steps = 1
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frac = 1.0 / steps
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# print length, steps, frac
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for i in range(steps):
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point = component.point(i * frac)
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x, y = point.real, point.imag
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if len(points) == 0 or points[-1] != (x, y):
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points.append((x, y))
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end = component.point(1.0)
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points.append((end.real, end.imag))
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continue
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# Move
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if isinstance(component, Move):
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if not points:
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continue
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else:
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rings.append(points)
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points = []
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continue
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log.warning("I don't know what this is: %s" % str(component))
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continue
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# if there are still points in points then add them to the last ring
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if points:
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rings.append(points)
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if len(rings) > 0:
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if len(rings) == 1:
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# Polygons are closed and require more than 2 points
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if Point(rings[0][0]).almost_equals(Point(rings[0][-1])) and len(rings[0]) > 2:
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geo_element = Polygon(rings[0])
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else:
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geo_element = LineString(rings[0])
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else:
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geo_element = Polygon(rings[0], rings[1:])
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geometry.append(geo_element)
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return geometry
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def svgrect2shapely(rect, n_points=32):
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"""
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Converts an SVG rect into Shapely geometry.
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:param rect: Rect Element
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:type rect: xml.etree.ElementTree.Element
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:return: shapely.geometry.polygon.LinearRing
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"""
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w = svgparselength(rect.get('width'))[0]
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h = svgparselength(rect.get('height'))[0]
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x_obj = rect.get('x')
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if x_obj is not None:
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x = svgparselength(x_obj)[0]
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else:
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x = 0
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y_obj = rect.get('y')
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if y_obj is not None:
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y = svgparselength(y_obj)[0]
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else:
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y = 0
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rxstr = rect.get('rx')
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rystr = rect.get('ry')
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if rxstr is None and rystr is None: # Sharp corners
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pts = [
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(x, y), (x + w, y), (x + w, y + h), (x, y + h), (x, y)
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]
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else: # Rounded corners
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rx = 0.0 if rxstr is None else svgparselength(rxstr)[0]
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ry = 0.0 if rystr is None else svgparselength(rystr)[0]
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n_points = int(n_points / 4 + 0.5)
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t = np.arange(n_points, dtype=float) / n_points / 4
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x_ = (x + w - rx) + rx * np.cos(2 * np.pi * (t + 0.75))
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y_ = (y + ry) + ry * np.sin(2 * np.pi * (t + 0.75))
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lower_right = [(x_[i], y_[i]) for i in range(n_points)]
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x_ = (x + w - rx) + rx * np.cos(2 * np.pi * t)
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y_ = (y + h - ry) + ry * np.sin(2 * np.pi * t)
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upper_right = [(x_[i], y_[i]) for i in range(n_points)]
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x_ = (x + rx) + rx * np.cos(2 * np.pi * (t + 0.25))
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y_ = (y + h - ry) + ry * np.sin(2 * np.pi * (t + 0.25))
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upper_left = [(x_[i], y_[i]) for i in range(n_points)]
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x_ = (x + rx) + rx * np.cos(2 * np.pi * (t + 0.5))
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y_ = (y + ry) + ry * np.sin(2 * np.pi * (t + 0.5))
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lower_left = [(x_[i], y_[i]) for i in range(n_points)]
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pts = [(x + rx, y), (x - rx + w, y)] + \
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lower_right + \
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[(x + w, y + ry), (x + w, y + h - ry)] + \
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upper_right + \
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[(x + w - rx, y + h), (x + rx, y + h)] + \
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upper_left + \
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[(x, y + h - ry), (x, y + ry)] + \
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lower_left
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return Polygon(pts).buffer(0)
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# return LinearRing(pts)
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def svgcircle2shapely(circle):
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"""
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Converts an SVG circle into Shapely geometry.
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:param circle: Circle Element
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:type circle: xml.etree.ElementTree.Element
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:return: Shapely representation of the circle.
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:rtype: shapely.geometry.polygon.LinearRing
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"""
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# cx = float(circle.get('cx'))
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# cy = float(circle.get('cy'))
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# r = float(circle.get('r'))
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cx = svgparselength(circle.get('cx'))[0] # TODO: No units support yet
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cy = svgparselength(circle.get('cy'))[0] # TODO: No units support yet
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r = svgparselength(circle.get('r'))[0] # TODO: No units support yet
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# TODO: No resolution specified.
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return Point(cx, cy).buffer(r)
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def svgellipse2shapely(ellipse, n_points=64):
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"""
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Converts an SVG ellipse into Shapely geometry
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:param ellipse: Ellipse Element
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:type ellipse: xml.etree.ElementTree.Element
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:param n_points: Number of discrete points in output.
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:return: Shapely representation of the ellipse.
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:rtype: shapely.geometry.polygon.LinearRing
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"""
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cx = svgparselength(ellipse.get('cx'))[0] # TODO: No units support yet
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cy = svgparselength(ellipse.get('cy'))[0] # TODO: No units support yet
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rx = svgparselength(ellipse.get('rx'))[0] # TODO: No units support yet
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ry = svgparselength(ellipse.get('ry'))[0] # TODO: No units support yet
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t = np.arange(n_points, dtype=float) / n_points
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x = cx + rx * np.cos(2 * np.pi * t)
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y = cy + ry * np.sin(2 * np.pi * t)
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pts = [(x[i], y[i]) for i in range(n_points)]
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return Polygon(pts).buffer(0)
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# return LinearRing(pts)
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def svgline2shapely(line):
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"""
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:param line: Line element
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:type line: xml.etree.ElementTree.Element
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:return: Shapely representation on the line.
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:rtype: shapely.geometry.polygon.LinearRing
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"""
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x1 = svgparselength(line.get('x1'))[0]
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y1 = svgparselength(line.get('y1'))[0]
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x2 = svgparselength(line.get('x2'))[0]
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y2 = svgparselength(line.get('y2'))[0]
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return LineString([(x1, y1), (x2, y2)])
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def svgpolyline2shapely(polyline):
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ptliststr = polyline.get('points')
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points = parse_svg_point_list(ptliststr)
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return LineString(points)
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def svgpolygon2shapely(polygon):
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ptliststr = polygon.get('points')
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points = parse_svg_point_list(ptliststr)
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return Polygon(points).buffer(0)
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# return LinearRing(points)
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def getsvggeo(node, object_type):
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"""
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Extracts and flattens all geometry from an SVG node
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into a list of Shapely geometry.
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:param node: xml.etree.ElementTree.Element
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:return: List of Shapely geometry
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:rtype: list
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"""
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kind = re.search('(?:\{.*\})?(.*)$', node.tag).group(1)
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geo = []
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# Recurse
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if len(node) > 0:
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for child in node:
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subgeo = getsvggeo(child, object_type)
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if subgeo is not None:
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geo += subgeo
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# Parse
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elif kind == 'path':
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log.debug("***PATH***")
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P = parse_path(node.get('d'))
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P = path2shapely(P, object_type)
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# for path, the resulting geometry is already a list so no need to create a new one
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geo = P
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elif kind == 'rect':
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log.debug("***RECT***")
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R = svgrect2shapely(node)
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geo = [R]
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elif kind == 'circle':
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log.debug("***CIRCLE***")
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C = svgcircle2shapely(node)
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geo = [C]
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elif kind == 'ellipse':
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log.debug("***ELLIPSE***")
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E = svgellipse2shapely(node)
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geo = [E]
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elif kind == 'polygon':
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log.debug("***POLYGON***")
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poly = svgpolygon2shapely(node)
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geo = [poly]
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elif kind == 'line':
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log.debug("***LINE***")
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line = svgline2shapely(node)
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geo = [line]
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elif kind == 'polyline':
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log.debug("***POLYLINE***")
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pline = svgpolyline2shapely(node)
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geo = [pline]
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else:
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log.warning("Unknown kind: " + kind)
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geo = None
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# ignore transformation for unknown kind
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if geo is not None:
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# Transformations
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if 'transform' in node.attrib:
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trstr = node.get('transform')
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trlist = parse_svg_transform(trstr)
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# log.debug(trlist)
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# Transformations are applied in reverse order
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for tr in trlist[::-1]:
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if tr[0] == 'translate':
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geo = [translate(geoi, tr[1], tr[2]) for geoi in geo]
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elif tr[0] == 'scale':
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geo = [scale(geoi, tr[1], tr[2], origin=(0, 0))
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for geoi in geo]
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elif tr[0] == 'rotate':
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geo = [rotate(geoi, tr[1], origin=(tr[2], tr[3]))
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for geoi in geo]
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elif tr[0] == 'skew':
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geo = [skew(geoi, tr[1], tr[2], origin=(0, 0))
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for geoi in geo]
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elif tr[0] == 'matrix':
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geo = [affine_transform(geoi, tr[1:]) for geoi in geo]
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else:
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raise Exception('Unknown transformation: %s', tr)
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return geo
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def getsvgtext(node, object_type, units='MM'):
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"""
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Extracts and flattens all geometry from an SVG node
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into a list of Shapely geometry.
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:param node: xml.etree.ElementTree.Element
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:return: List of Shapely geometry
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:rtype: list
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"""
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kind = re.search('(?:\{.*\})?(.*)$', node.tag).group(1)
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geo = []
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# Recurse
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if len(node) > 0:
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for child in node:
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subgeo = getsvgtext(child, object_type, units=units)
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if subgeo is not None:
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geo += subgeo
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# Parse
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elif kind == 'tspan':
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current_attrib = node.attrib
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txt = node.text
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style_dict = {}
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parrent_attrib = node.getparent().attrib
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style = parrent_attrib['style']
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try:
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style_list = style.split(';')
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for css in style_list:
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style_dict[css.rpartition(':')[0]] = css.rpartition(':')[-1]
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pos_x = float(current_attrib['x'])
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pos_y = float(current_attrib['y'])
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# should have used the instance from FlatCAMApp.App but how? without reworking everything ...
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pf = ParseFont()
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pf.get_fonts_by_types()
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font_name = style_dict['font-family'].replace("'", '')
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if style_dict['font-style'] == 'italic' and style_dict['font-weight'] == 'bold':
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font_type = 'bi'
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elif style_dict['font-weight'] == 'bold':
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font_type = 'bold'
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elif style_dict['font-style'] == 'italic':
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font_type = 'italic'
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else:
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font_type = 'regular'
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# value of 2.2 should have been 2.83 (conversion value from pixels to points)
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# but the dimensions from Inkscape did not corelate with the ones after importing in FlatCAM
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# so I adjusted this
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font_size = svgparselength(style_dict['font-size'])[0] * 2.2
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geo = [pf.font_to_geometry(txt,
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font_name=font_name,
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font_size=font_size,
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font_type=font_type,
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units=units,
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coordx=pos_x,
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coordy=pos_y)
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]
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geo = [(scale(g, 1.0, -1.0)) for g in geo]
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except Exception as e:
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log.debug(str(e))
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else:
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geo = None
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# ignore transformation for unknown kind
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if geo is not None:
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# Transformations
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if 'transform' in node.attrib:
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trstr = node.get('transform')
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trlist = parse_svg_transform(trstr)
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# log.debug(trlist)
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# Transformations are applied in reverse order
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for tr in trlist[::-1]:
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if tr[0] == 'translate':
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geo = [translate(geoi, tr[1], tr[2]) for geoi in geo]
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elif tr[0] == 'scale':
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geo = [scale(geoi, tr[1], tr[2], origin=(0, 0))
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for geoi in geo]
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elif tr[0] == 'rotate':
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geo = [rotate(geoi, tr[1], origin=(tr[2], tr[3]))
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for geoi in geo]
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elif tr[0] == 'skew':
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geo = [skew(geoi, tr[1], tr[2], origin=(0, 0))
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for geoi in geo]
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elif tr[0] == 'matrix':
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geo = [affine_transform(geoi, tr[1:]) for geoi in geo]
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else:
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raise Exception('Unknown transformation: %s', tr)
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return geo
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def parse_svg_point_list(ptliststr):
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"""
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Returns a list of coordinate pairs extracted from the "points"
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attribute in SVG polygons and polyline's.
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:param ptliststr: "points" attribute string in polygon or polyline.
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:return: List of tuples with coordinates.
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"""
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pairs = []
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last = None
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pos = 0
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i = 0
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for match in re.finditer(r'(\s*,\s*)|(\s+)', ptliststr.strip(' ')):
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val = float(ptliststr[pos:match.start()])
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if i % 2 == 1:
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pairs.append((last, val))
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else:
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last = val
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pos = match.end()
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i += 1
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# Check for last element
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val = float(ptliststr[pos:])
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if i % 2 == 1:
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pairs.append((last, val))
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else:
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log.warning("Incomplete coordinates.")
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return pairs
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def parse_svg_transform(trstr):
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"""
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Parses an SVG transform string into a list
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of transform names and their parameters.
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Possible transformations are:
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* Translate: translate(<tx> [<ty>]), which specifies
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a translation by tx and ty. If <ty> is not provided,
|
|
it is assumed to be zero. Result is
|
|
['translate', tx, ty]
|
|
|
|
* Scale: scale(<sx> [<sy>]), which specifies a scale operation
|
|
by sx and sy. If <sy> is not provided, it is assumed to be
|
|
equal to <sx>. Result is: ['scale', sx, sy]
|
|
|
|
* Rotate: rotate(<rotate-angle> [<cx> <cy>]), which specifies
|
|
a rotation by <rotate-angle> degrees about a given point.
|
|
If optional parameters <cx> and <cy> are not supplied,
|
|
the rotate is about the origin of the current user coordinate
|
|
system. Result is: ['rotate', rotate-angle, cx, cy]
|
|
|
|
* Skew: skewX(<skew-angle>), which specifies a skew
|
|
transformation along the x-axis. skewY(<skew-angle>), which
|
|
specifies a skew transformation along the y-axis.
|
|
Result is ['skew', angle-x, angle-y]
|
|
|
|
* Matrix: matrix(<a> <b> <c> <d> <e> <f>), which specifies a
|
|
transformation in the form of a transformation matrix of six
|
|
values. matrix(a,b,c,d,e,f) is equivalent to applying the
|
|
transformation matrix [a b c d e f]. Result is
|
|
['matrix', a, b, c, d, e, f]
|
|
|
|
Note: All parameters to the transformations are "numbers",
|
|
i.e. no units present.
|
|
|
|
:param trstr: SVG transform string.
|
|
:type trstr: str
|
|
:return: List of transforms.
|
|
:rtype: list
|
|
"""
|
|
trlist = []
|
|
|
|
assert isinstance(trstr, str)
|
|
trstr = trstr.strip(' ')
|
|
|
|
integer_re_str = r'[+-]?[0-9]+'
|
|
number_re_str = r'(?:[+-]?[0-9]*\.[0-9]+(?:[Ee]' + integer_re_str + ')?' + r')|' + \
|
|
r'(?:' + integer_re_str + r'(?:[Ee]' + integer_re_str + r')?)'
|
|
|
|
# num_re_str = r'[\+\-]?[0-9\.e]+' # TODO: Negative exponents missing
|
|
comma_or_space_re_str = r'(?:(?:\s+)|(?:\s*,\s*))'
|
|
translate_re_str = r'translate\s*\(\s*(' + \
|
|
number_re_str + r')(?:' + \
|
|
comma_or_space_re_str + \
|
|
r'(' + number_re_str + r'))?\s*\)'
|
|
scale_re_str = r'scale\s*\(\s*(' + \
|
|
number_re_str + r')' + \
|
|
r'(?:' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r'))?\s*\)'
|
|
skew_re_str = r'skew([XY])\s*\(\s*(' + \
|
|
number_re_str + r')\s*\)'
|
|
rotate_re_str = r'rotate\s*\(\s*(' + \
|
|
number_re_str + r')' + \
|
|
r'(?:' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r')' + \
|
|
comma_or_space_re_str + \
|
|
r'(' + number_re_str + r'))?\s*\)'
|
|
matrix_re_str = r'matrix\s*\(\s*' + \
|
|
r'(' + number_re_str + r')' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r')' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r')' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r')' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r')' + comma_or_space_re_str + \
|
|
r'(' + number_re_str + r')\s*\)'
|
|
|
|
while len(trstr) > 0:
|
|
match = re.search(r'^' + translate_re_str, trstr)
|
|
if match:
|
|
trlist.append([
|
|
'translate',
|
|
float(match.group(1)),
|
|
float(match.group(2)) if (match.group(2) is not None) else 0.0
|
|
])
|
|
trstr = trstr[len(match.group(0)):].strip(' ')
|
|
continue
|
|
|
|
match = re.search(r'^' + scale_re_str, trstr)
|
|
if match:
|
|
trlist.append([
|
|
'scale',
|
|
float(match.group(1)),
|
|
float(match.group(2)) if (match.group(2) is not None) else float(match.group(1))
|
|
])
|
|
trstr = trstr[len(match.group(0)):].strip(' ')
|
|
continue
|
|
|
|
match = re.search(r'^' + skew_re_str, trstr)
|
|
if match:
|
|
trlist.append([
|
|
'skew',
|
|
float(match.group(2)) if match.group(1) == 'X' else 0.0,
|
|
float(match.group(2)) if match.group(1) == 'Y' else 0.0
|
|
])
|
|
trstr = trstr[len(match.group(0)):].strip(' ')
|
|
continue
|
|
|
|
match = re.search(r'^' + rotate_re_str, trstr)
|
|
if match:
|
|
trlist.append([
|
|
'rotate',
|
|
float(match.group(1)),
|
|
float(match.group(2)) if match.group(2) else 0.0,
|
|
float(match.group(3)) if match.group(3) else 0.0
|
|
])
|
|
trstr = trstr[len(match.group(0)):].strip(' ')
|
|
continue
|
|
|
|
match = re.search(r'^' + matrix_re_str, trstr)
|
|
if match:
|
|
trlist.append(['matrix'] + [float(x) for x in match.groups()])
|
|
trstr = trstr[len(match.group(0)):].strip(' ')
|
|
continue
|
|
|
|
# raise Exception("Don't know how to parse: %s" % trstr)
|
|
log.error("[ERROR] Don't know how to parse: %s" % trstr)
|
|
|
|
return trlist
|
|
|
|
# if __name__ == "__main__":
|
|
# tree = ET.parse('tests/svg/drawing.svg')
|
|
# root = tree.getroot()
|
|
# ns = re.search(r'\{(.*)\}', root.tag).group(1)
|
|
# print(ns)
|
|
# for geo in getsvggeo(root):
|
|
# print(geo)
|