98 lines
3.6 KiB
Python
Executable File
98 lines
3.6 KiB
Python
Executable File
#!/usr/bin/python3
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# Copyright (C) 2016 Florian Festi
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import xml.parsers.expat
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import re
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class SVGFile(object):
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pathre = re.compile(r"[MCL]? *((-?\d+(\.\d+)?) (-?\d+(\.\d+)?) *)+")
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transformre = re.compile(r"matrix\(" + ",".join([r"(-?\d+(\.\d+)?)"] * 6) + "\)")
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def __init__(self, filename):
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self.filename = filename
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self.minx = self.maxx = self.miny = self.maxy = None
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def handleStartElement(self, name, attrs):
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self.tags.append(name)
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if name == "path" and "symbol" not in self.tags:
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minx = maxx = miny = maxy = None
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m = self.transformre.match(attrs.get("transform", ""))
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if m:
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matrix = [float(m.group(i)) for i in range(1, 12, 2)]
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else:
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matrix = [1, 0,
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0, 1,
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0, 0]
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for m in self.pathre.findall(attrs.get("d", "")):
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x = float(m[1])
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y = float(m[3])
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tx = matrix[0]*x+matrix[2]*y+matrix[4]
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ty = matrix[1]*x+matrix[3]*y+matrix[5]
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if self.minx is None or self.minx > tx:
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self.minx = tx
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if self.maxx is None or self.maxx < tx:
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self.maxx = tx
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if self.miny is None or self.miny > ty:
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self.miny = ty
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if self.maxy is None or self.maxy < ty:
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self.maxy = ty
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def handleEndElement(self, name):
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last = self.tags.pop()
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if last != name:
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raise ValueError("Got </%s> expected </%s>" % (name, last))
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def getEnvelope(self):
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self.tags = []
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p = xml.parsers.expat.ParserCreate()
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p.StartElementHandler = self.handleStartElement
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p.EndElementHandler = self.handleEndElement
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p.ParseFile(open(self.filename, "rb"))
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def rewriteViewPort(self):
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f = open(self.filename, "r+")
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s = f.read(1024)
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m = re.search(r"""<svg[^>]*(width="(\d+pt)" height="(\d+pt)" viewBox="0 (0 (\d+) (\d+))") version="1.1">""", s)
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#minx = 10*int(self.minx//10)-10
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# as we don't rewrite the left border keep it as 0
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if 0 <= self.minx <= 50:
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minx = 0
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else:
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raise ValueError("Left end of drawing at wrong place: %imm (0-50mm expected)" % self.minx)
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maxx = 10*int(self.maxx//10)+10
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miny = 10*int(self.miny//10)-10
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maxy = 10*int(self.maxy//10)+10
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if m:
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f.seek(m.start(1))
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s = ('width="%imm" height="%imm" viewBox="0 %i %i %i"' %
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(maxx-minx, maxy-miny, miny, maxx, maxy-miny))
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if len(s) > len(m.group(1)):
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raise ValueError("Not enough space for size")
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f.write(s + " " * (len(m.group(1))- len(s)))
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else:
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raiseValueError("Could not understand SVG file")
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if __name__ == "__main__":
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svg = SVGFile("examples/box.svg")
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svg.getEnvelope()
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svg.rewriteViewPort()
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