boxespy/boxes/svgutil.py

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