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 re, datetime
from xml.etree import cElementTree as ElementTree
ElementTree.register_namespace("","http://www.w3.org/2000/svg")
ElementTree.register_namespace("xlink", "http://www.w3.org/1999/xlink")
class Extend:
def __init__(self):
self.minx = None
self.maxx = None
self.miny = None
self.maxy = None
def __add__(self, v):
x, y = v
res = Extend()
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if self.minx is not None:
res.minx = self.minx + x
if self.maxx is not None:
res.maxx = self.maxx + x
if self.miny is not None:
res.miny = self.miny + y
if self.maxy is not None:
res.maxy = self.maxy + y
return res
def addPoint(self, x, y):
if x is not None:
if self.minx is None or self.minx > x:
self.minx = x
if self.maxx is None or self.maxx < x:
self.maxx = x
if y is not None:
if self.miny is None or self.miny > y:
self.miny = y
if self.maxy is None or self.maxy < y:
self.maxy = y
def addExtend(self, extend, x, y):
extend = extend + (x, y)
self.addPoint(extend.minx, extend.miny)
self.addPoint(extend.maxx, extend.maxy)
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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)
self.symbol_extends = {}
def fix(self, metadata=None):
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#print("Optimizations:",
self.optimize(self.tree.getroot())
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self.getEnvelope()
self.moveOrigin()
self.addMetadata(metadata)
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self.rewriteViewPort()
def getExtend(self, element, extend):
if element.tag.endswith("}path"):
minx = maxx = miny = maxy = None
m = self.transformre.match(element.attrib.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(element.attrib.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]
extend.addPoint(tx, ty)
elif element.tag.endswith("}use"):
x, y = float(element.attrib["x"]), float(element.attrib["y"])
s = self.symbol_extends[element.attrib["{http://www.w3.org/1999/xlink}href"][1:]]
extend.addExtend(s, x, y)
for e in element:
if e.tag.endswith("}symbol"):
self.symbol_extends[e.attrib["id"]] = self.getExtend(e, Extend())
else:
self.getExtend(e, extend)
return extend
def getEnvelope(self):
self.tags = []
root = self.tree.getroot()
self.extend = self.getExtend(root, Extend())
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def _moveElement(self, e, dx, dy):
if e.tag.endswith("}symbol"):
return
if e.tag.endswith("}path"):
minx = maxx = miny = maxy = None
m = self.transformre.match(e.attrib.get("transform", ""))
if m:
matrix = [float(m.group(i)) for i in range(1, 12, 2)]
else:
matrix = [1, 0,
0, 1,
0, 0]
matrix[4] += dx
matrix[5] += dy
e.attrib["transform"] = "matrix(%s)" % (",".join(("%.4f" % m for m in matrix)))
if e.tag.endswith("}use"):
e.attrib["x"] = "%.4f" % (float(e.attrib["x"])+dx)
e.attrib["y"] = "%.4f" % (float(e.attrib["y"])+dy)
for child in e:
self._moveElement(child, dx, dy)
def moveOrigin(self):
self._moveElement(self.tree.getroot(),
-self.extend.minx+10, -self.extend.miny+10)
self.extend.maxx -= self.extend.minx-20
self.extend.maxy -= self.extend.miny-20
self.extend.minx = self.extend.miny = 0.0
def rewriteViewPort(self):
"""
Modify SVG file to have the correct width, height and viewPort attributes.
"""
self.extend.minx = self.extend.minx or 0
self.extend.miny = self.extend.miny or 0
self.extend.maxx = self.extend.maxx or (self.extend.minx + 10)
self.extend.maxy = self.extend.maxy or (self.extend.miny + 10)
if 0 <= self.extend.minx <= 50:
minx = 0
else:
minx = 10 * int(self.extend.minx // 10) - 10
maxx = 10 * int(self.extend.maxx // 10) + 10
miny = 10 * int(self.extend.miny // 10) - 10
maxy = 10 * int(self.extend.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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d = r"(\-?\d+(\.\d+)?)"
optimize_patterns = [
(re.compile(" " + d + " " + d + r" (M|L) \1 \3 "),
r" \1 \3 "), # remove useless moves
# compress L parts of paths into V and H
(re.compile(" " + d + " " + d + r" L " + d + r" \3 "),
r" \1 \3 H \5 "),
(re.compile(" " + d + " " + d + r" L \1 " + d + " "),
r" \1 \3 V \5 "),
(re.compile(r"H " + d + r" L \1 " + d + " "),
r"H \1 V \3 "),
(re.compile(r"V " + d + " L " + d + " \1 "),
r"V \1 H \3 "),
]
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def optimize(self, element):
number = 0
if element.tag.endswith("}path"):
path = element.attrib.get("d", "")
while True:
old_number = number
for pattern, replacement in self.optimize_patterns:
path, n = pattern.subn(replacement, path)
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number += n
if number == old_number:
break
element.attrib["d"] = path
for e in element:
number += self.optimize(e)
return number
def _addTag(self, parent, tag, text, first=False):
if first:
t = ElementTree.Element(tag)
else:
t = ElementTree.SubElement(parent, tag)
t.text = text
t.tail = '\n'
if first:
parent.insert(0, t)
return t
def addMetadata(self, md):
root = self.tree.getroot()
# Add Inkscape style rdf meta data
root.set("xmlns:dc", "http://purl.org/dc/elements/1.1/")
root.set("xmlns:cc", "http://creativecommons.org/ns#")
root.set("xmlns:rdf","http://www.w3.org/1999/02/22-rdf-syntax-ns#")
title = "{group} - {name}".format(**md)
date = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
m = self._addTag(root, "metadata", '\n', True)
r = ElementTree.SubElement(m, 'rdf:RDF')
w = ElementTree.SubElement(r, 'cc:Work')
w.text = '\n'
self._addTag(w, 'dc:title', title)
self._addTag(w, 'dc:date', date)
if "url" in md and md["url"]:
self._addTag(w, 'dc:source', md["url"])
else:
self._addTag(w, 'dc:source', md["cli"])
desc = md["short_description"]
if "description" in md and md["description"]:
desc += "\n\n" + md["description"]
desc += "\n\nCreated with Boxes.py (https://festi.info/boxes.py)\n"
desc += "Command line: %s\n" % md["cli"]
if md["url"]:
desc += "Url: %s\n" % md["url"]
desc += "SettingsUrl: %s\n" % re.sub(r"&render=[01]", "", md["url"])
self._addTag(w, 'dc:description', desc)
# title
self._addTag(root, "title", md["name"], True)
# Add XML comment
txt = """
{name} - {short_description}
""".format(**md)
if md["description"]:
txt += """
{description}
""".format(**md)
txt += """
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Created with Boxes.py (https://festi.info/boxes.py)
Creation date: {date}
""".format(date=date, **md)
txt += "Command line (remove spaces beteen dashes): %s\n" % md["cli"].replace("--", "- -")
if md["url"]:
txt += "Url: %s\n" % md["url"]
txt += "SettingsUrl: %s\n" % re.sub(r"&render=[01]", "", md["url"])
m = ElementTree.Comment(txt)
m.tail = '\n'
root.insert(0, m)
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):
src_tree = ElementTree.parse(box)
dest_tree = ElementTree.parse(inkscape)
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, encoding='utf-8', xml_declaration=True)
if __name__ == "__main__":
svg = SVGFile("examples/box.svg")
svg.getEnvelope()
svg.rewriteViewPort()