173 lines
5.4 KiB
Python
Executable File
173 lines
5.4 KiB
Python
Executable File
#!/usr/bin/env 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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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+)?) *)+")
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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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self.tree = ElementTree.parse(filename)
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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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"""
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Modify SVG file to have the correct width, height and viewPort attributes.
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"""
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self.minx = self.minx or 0
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self.miny = self.miny or 0
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self.maxx = self.maxx or (self.minx + 10)
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self.maxy = self.maxy or (self.miny + 10)
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if 0 <= self.minx <= 50:
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minx = 0
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else:
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minx = 10 * int(self.minx // 10) - 10
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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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root = self.tree.getroot()
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root.set('width', "%imm" % (maxx-minx))
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root.set('height', "%imm" % (maxy-miny))
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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,
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"cm" : 10.0,
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"in" : 25.4,
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"px" : 90.0/25.4,
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"pt" : 90.0/25.4/1.25,
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"pc" : 90.0/25.4/15,
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}
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def getSizeInMM(tree):
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root = tree.getroot()
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m = re.match(r"(-?\d+\.?\d*)(\D+)", root.get("height"))
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height, units = m.groups()
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height = float(height) * unit2mm.get(units, 1.0)
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m = re.match(r"(-?\d+\.?\d*)(\D+)", root.get("width"))
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width, units = m.groups()
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width = float(width) * unit2mm.get(units, 1.0)
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return width, height
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def getViewBox(tree):
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root = tree.getroot()
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m = re.match(r"\s*(-?\d+\.?\d*)\s+"
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"(-?\d+\.?\d*)\s+"
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"(-?\d+\.?\d*)\s+"
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"(-?\d+\.?\d)\s*", root.get("viewBox"))
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return [float(m) for m in m.groups()]
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def ticksPerMM(tree):
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width, height = getSizeInMM(tree)
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x1, y1, x2, y2 = getViewBox(tree)
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return x2/width, y2/height
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def svgMerge(box, inkscape, output):
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from lxml import etree as et
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parser = et.XMLParser(remove_blank_text=True)
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src_tree = et.parse(box, parser)
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dest_tree = et.parse(inkscape, parser)
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dest_root = dest_tree.getroot()
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src_width, src_height = getSizeInMM(src_tree)
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dest_width, dest_height = getSizeInMM(dest_tree)
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src_scale_x, src_scale_y = ticksPerMM(src_tree)
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dest_scale_x, dest_scale_y = ticksPerMM(dest_tree)
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scale_x = dest_scale_x / src_scale_x
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scale_y = dest_scale_y / src_scale_y
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src_view = getViewBox(src_tree)
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off_x = src_view[0] * -scale_x
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off_y = (src_view[1]+src_view[3]) * -scale_y + dest_height * scale_y
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for el in src_tree.getroot():
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import sys
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dest_root.append(el)
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if el.tag.endswith("g"):
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el.set("transform", "matrix(%f,0,0,%f, %f, %f)" % (
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scale_x, scale_y, off_x, off_y))
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# write the xml file
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et.ElementTree(dest_root).write(output, pretty_print=True, encoding='utf-8', xml_declaration=True)
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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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