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
from xml.etree import cElementTree as ElementTree
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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
self.tree = ElementTree.parse(filename)
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", ""))
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if m:
matrix = [float(m.group(i)) for i in range(1, 12, 2)]
else:
matrix = [1, 0,
0, 1,
0, 0]
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for m in self.pathre.findall(attrs.get("d", "")):
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]
ty = matrix[1] * x + matrix[3] * y + matrix[5]
if self.minx is None or self.minx > tx:
self.minx = tx
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if self.maxx is None or self.maxx < tx:
self.maxx = tx
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if self.miny is None or self.miny > ty:
self.miny = ty
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if self.maxy is None or self.maxy < ty:
self.maxy = ty
def handleEndElement(self, name):
last = self.tags.pop()
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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):
"""
Modify SVG file to have the correct width, height and viewPort attributes.
"""
self.minx = self.minx or 0
self.miny = self.miny or 0
self.maxx = self.maxx or (self.minx + 10)
self.maxy = self.maxy or (self.miny + 10)
if 0 <= self.minx <= 50:
minx = 0
else:
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minx = 10 * int(self.minx // 10) - 10
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maxx = 10 * int(self.maxx // 10) + 10
miny = 10 * int(self.miny // 10) - 10
maxy = 10 * int(self.maxy // 10) + 10
root = self.tree.getroot()
root.set('width', "%imm" % (maxx-minx))
root.set('height', "%imm" % (maxy-miny))
root.set('viewBox', "%i %i %i %i" % (minx, miny, maxx - minx, maxy - miny))
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self.tree.write(self.filename)
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unit2mm = {"mm" : 1.0,
"cm" : 10.0,
"in" : 25.4,
"px" : 90.0/25.4,
"pt" : 90.0/25.4/1.25,
"pc" : 90.0/25.4/15,
}
def getSizeInMM(tree):
root = tree.getroot()
m = re.match(r"(-?\d+\.?\d*)(\D+)", root.get("height"))
height, units = m.groups()
height = float(height) * unit2mm.get(units, 1.0)
m = re.match(r"(-?\d+\.?\d*)(\D+)", root.get("width"))
width, units = m.groups()
width = float(width) * unit2mm.get(units, 1.0)
return width, height
def getViewBox(tree):
root = tree.getroot()
m = re.match(r"\s*(-?\d+\.?\d*)\s+"
"(-?\d+\.?\d*)\s+"
"(-?\d+\.?\d*)\s+"
"(-?\d+\.?\d)\s*", root.get("viewBox"))
return [float(m) for m in m.groups()]
def ticksPerMM(tree):
width, height = getSizeInMM(tree)
x1, y1, x2, y2 = getViewBox(tree)
return x2/width, y2/height
def svgMerge(box, inkscape, output):
parser = ElementTree.XMLParser(remove_blank_text=True)
src_tree = ElementTree.parse(box, parser)
dest_tree = ElementTree.parse(inkscape, parser)
dest_root = dest_tree.getroot()
src_width, src_height = getSizeInMM(src_tree)
dest_width, dest_height = getSizeInMM(dest_tree)
src_scale_x, src_scale_y = ticksPerMM(src_tree)
dest_scale_x, dest_scale_y = ticksPerMM(dest_tree)
scale_x = dest_scale_x / src_scale_x
scale_y = dest_scale_y / src_scale_y
src_view = getViewBox(src_tree)
off_x = src_view[0] * -scale_x
off_y = (src_view[1]+src_view[3]) * -scale_y + dest_height * scale_y
for el in src_tree.getroot():
import sys
dest_root.append(el)
if el.tag.endswith("g"):
el.set("transform", "matrix(%f,0,0,%f, %f, %f)" % (
scale_x, scale_y, off_x, off_y))
# write the xml file
ElementTree.ElementTree(dest_root).write(output, pretty_print=True, encoding='utf-8', xml_declaration=True)
if __name__ == "__main__":
svg = SVGFile("examples/box.svg")
svg.getEnvelope()
svg.rewriteViewPort()