Added Incadiff extension
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<?xml version="1.0" encoding="UTF-8"?>
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<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
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<name>Incadiff</name>
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<id>fablabchemnitz.de.incadiff</id>
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<effect needs-document="true" needs-live-preview="false">
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<effects-menu hidden="false">
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<submenu name="FabLab Chemnitz">
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<submenu name="Modify existing Path(s)"/>
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</submenu>
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</effects-menu>
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<menu-tip>Apply successive difference operations on superimposed paths. Useful for plotter addicts.</menu-tip>
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<object-type>all</object-type>
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</effect>
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<script>
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<command location="inx" interpreter="python">incadiff.py</command>
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</script>
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</inkscape-extension>
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#!/usr/bin/env python3
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# coding=utf-8
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"""
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Copyright (C) 2021 Thomas Maziere <thomas.maziere@incaya.fr>
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Largely and mostly inspired by inx-pathops (https://gitlab.com/moini_ink/inx-pathops/)
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Copyright (C) 2014 Ryan Lerch (multiple difference)
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2016 Maren Hachmann <marenhachmannATyahoo.com>
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(refactoring, extend to multibool)
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2017 su_v <suv-sf@users.sf.net>
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Rewrite to support large selections (process in chunks), to
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improve performance (support groups, z-sort ids with python
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instead of external query), and to extend GUI options.
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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 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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"""
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"""
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incadiff
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Apply successive difference operations on superimposed paths. Useful for plotter addicts.
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"""
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import os
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from shutil import copy2
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import time
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from lxml import etree
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import inkex
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import inkex.command
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__version__ = '0.2'
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# Global "constants"
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SVG_SHAPES = ('rect', 'circle', 'ellipse', 'line', 'polyline', 'polygon')
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# ----- general helper functions
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def timed(f):
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"""Minimalistic timer for functions."""
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# pylint: disable=invalid-name
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start = time.time()
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ret = f()
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elapsed = time.time() - start
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return ret, elapsed
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def get_inkscape_version():
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ink = inkex.command.INKSCAPE_EXECUTABLE_NAME
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try: # needed prior to 1.1
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ink_version = inkex.command.call(ink, '--version').decode("utf-8")
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except AttributeError: # needed starting from 1.1
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ink_version = inkex.command.call(ink, '--version')
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pos = ink_version.find("Inkscape ")
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if pos != -1:
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pos += 9
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else:
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return None
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v_num = ink_version[pos:pos+3]
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return(v_num)
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# ----- SVG element helper functions
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def get_defs(node):
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"""Find <defs> in children of *node*, return first one found."""
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path = '/svg:svg//svg:defs'
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try:
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return node.xpath(path, namespaces=inkex.NSS)[0]
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except IndexError:
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return etree.SubElement(node, inkex.addNS('defs', 'svg'))
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def is_group(node):
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"""Check node for group tag."""
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return node.tag == inkex.addNS('g', 'svg')
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def is_path(node):
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"""Check node for path tag."""
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return node.tag == inkex.addNS('path', 'svg')
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def is_basic_shape(node):
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"""Check node for SVG basic shape tag."""
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return node.tag in (inkex.addNS(tag, 'svg') for tag in SVG_SHAPES)
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def is_custom_shape(node):
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"""Check node for Inkscape custom shape type."""
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return inkex.addNS('type', 'sodipodi') in node.attrib
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def is_shape(node):
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"""Check node for SVG basic shape tag or Inkscape custom shape type."""
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return is_basic_shape(node) or is_custom_shape(node)
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def has_path_effect(node):
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"""Check node for Inkscape path-effect attribute."""
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return inkex.addNS('path-effect', 'inkscape') in node.attrib
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def is_modifiable_path(node):
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"""Check node for editable path data."""
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return is_path(node) and not (has_path_effect(node) or
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is_custom_shape(node))
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def is_image(node):
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"""Check node for image tag."""
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return node.tag == inkex.addNS('image', 'svg')
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def is_text(node):
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"""Check node for text tag."""
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return node.tag == inkex.addNS('text', 'svg')
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def does_pathops(node):
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"""Check whether node is supported by Inkscape path operations."""
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return (is_path(node) or
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is_shape(node) or
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is_text(node))
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# ----- list processing helper functions
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def recurse_selection(node, id_list, level=0, current=0):
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"""Recursively process selection, add checked elements to id list."""
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current += 1
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if not level or current <= level:
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if is_group(node):
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for child in node:
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id_list = recurse_selection(child, id_list, level, current)
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if does_pathops(node):
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id_list.append(node.get('id'))
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return id_list
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def z_sort(node, alist):
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"""Return new list sorted in document order (depth-first traversal)."""
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ordered = []
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id_list = list(alist)
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count = len(id_list)
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for element in node.iter():
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element_id = element.get('id')
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if element_id is not None and element_id in id_list:
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id_list.remove(element_id)
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ordered.append(element_id)
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count -= 1
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if not count:
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break
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return ordered
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def z_iter(node, alist):
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"""Return iterator over ids in document order (depth-first traversal)."""
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id_list = list(alist)
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for element in node.iter():
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element_id = element.get('id')
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if element_id is not None and element_id in id_list:
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id_list.remove(element_id)
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yield element_id
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def chunks(alist, max_len):
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"""Chunk a list into sublists of max_len length."""
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for i in range(0, len(alist), max_len):
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yield alist[i:i+max_len]
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class IncadiffExtension(inkex.Effect):
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def __init__(self):
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inkex.Effect.__init__(self)
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self.actions_list = []
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def add_arguments(self, pars):
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pars.add_argument("--my_option", type=inkex.Boolean,
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help="An example option, put your options here")
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def get_selected_ids(self):
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"""Return a list of valid ids for inkscape path operations."""
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id_list = []
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if len(self.svg.selected) == 0:
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pass
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else:
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level = 0
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for node in self.svg.selected.values():
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recurse_selection(node, id_list, level)
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if len(id_list) < 2:
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inkex.errormsg("This extension requires at least 2 elements " +
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"of type path, shape or text. " +
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"The elements can be part of selected groups, " +
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"or directly selected.")
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return None
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if len(id_list) > 64:
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inkex.errormsg("You should not select more than 64 shapes/paths, " +
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"and ideally you should apply this extension to small groups of objects.")
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return None
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else:
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return id_list
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def get_sorted_ids(self):
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"""Return a list with z-sorted ids."""
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sorted_ids = None
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id_list = self.get_selected_ids()
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if id_list is not None:
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sorted_ids = list(z_iter(self.document.getroot(), id_list))
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return (sorted_ids)
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else:
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return
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def run_cmd(self, tempfile):
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#ink_version = get_inkscape_version()
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self.actions_list.append("FileSave")
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extra_param = "--batch-process"
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# if ink_version == "1.0":
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# self.actions_list.append("FileQuit")
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# extra_param = "--with-gui"
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actions = ";".join(self.actions_list)
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inkex.command.inkscape(tempfile, extra_param, actions=actions)
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def duplicate_and_diff(self, id_list, tempfile):
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# for each selected path, duplicate and diff for each path below
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nb_shapes = len(id_list)
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for i in range(0, nb_shapes):
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top_path = id_list[i]
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j = i
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while j > 0:
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j -= 1
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self.actions_list.append("select-by-id:"+top_path)
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self.actions_list.append("EditDuplicate")
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self.actions_list.append("select-by-id:" + id_list[j])
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self.actions_list.append("SelectionDiff")
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self.actions_list.append("EditDeselect")
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if nb_shapes > 20:
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self.run_cmd(tempfile)
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self.actions_list = []
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if len(self.actions_list) > 0:
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self.run_cmd(tempfile)
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self.actions_list = []
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def loop_diff(self):
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"""Loop through selected items and run external command(s)."""
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tempfile = self.options.input_file + "-incadiff.svg"
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# prepare
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# we need to do this because command line Inkscape with gui
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# gives lots of info dialogs when the file extension isn't 'svg'
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# so the inkscape() call cannot open the file without user
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# interaction, and fails in the end when trying to save
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copy2(self.options.input_file, tempfile)
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# loop through selected paths
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id_list = self.get_sorted_ids()
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if id_list is not None:
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self.duplicate_and_diff(id_list, tempfile)
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else:
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return
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# replace current document with content of temp copy file
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self.document = inkex.load_svg(tempfile)
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# update self.svg
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self.svg = self.document.getroot()
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# purge missing tagrefs (see below)
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self.update_tagrefs()
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# clean up
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self.cleanup(tempfile)
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def cleanup(self, tempfile):
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"""Clean up tempfile."""
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try:
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os.remove(tempfile)
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except Exception: # pylint: disable=broad-except
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pass
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def effect(self):
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if self.has_tagrefs():
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# unsafe to use with extensions ...
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inkex.utils.errormsg("This document uses Inkscape selection sets. " +
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"Modifying the content with this extension " +
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"may cause Inkscape to crash on reload or close. " +
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"Please delete the selection sets, " +
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"save the document under a new name and " +
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"try again in a new Inkscape session.")
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else:
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self.loop_diff()
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def has_tagrefs(self):
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"""Check whether document has selection sets with tagrefs."""
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defs = get_defs(self.document.getroot())
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inkscape_tagrefs = defs.findall(
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"inkscape:tag/inkscape:tagref", namespaces=inkex.NSS)
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return len(inkscape_tagrefs) > 0
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def update_tagrefs(self, mode='purge'):
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"""Check tagrefs for deleted objects."""
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defs = get_defs(self.document.getroot())
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inkscape_tagrefs = defs.findall(
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"inkscape:tag/inkscape:tagref", namespaces=inkex.NSS)
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if len(inkscape_tagrefs) > 0:
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for tagref in inkscape_tagrefs:
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href = tagref.get(inkex.addNS('href', 'xlink'))[1:]
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if self.svg.getElementById(href) is None:
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if mode == 'purge':
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tagref.getparent().remove(tagref)
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elif mode == 'placeholder':
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temp = etree.Element(inkex.addNS('path', 'svg'))
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temp.set('id', href)
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temp.set('d', 'M 0,0 Z')
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self.document.getroot().append(temp)
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# ----- workaround to fix Effect() performance with large selections
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def collect_ids(self, doc=None):
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"""Iterate all elements, build id dicts (doc_ids, selected)."""
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doc = self.document if doc is None else doc
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id_list = list(self.options.ids)
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for node in doc.getroot().iter(tag=etree.Element):
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if 'id' in node.attrib:
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node_id = node.get('id')
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self.doc_ids[node_id] = 1
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if node_id in id_list:
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self.svg.selected[node_id] = node
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id_list.remove(node_id)
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def getselected(self):
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"""Overload Effect() method."""
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self.collect_ids()
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def getdocids(self):
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"""Overload Effect() method."""
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pass
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if __name__ == '__main__':
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IncadiffExtension().run()
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