Working on Create Links extension (bridges, tabs)
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extensions/fablabchemnitz/create_links.inx
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extensions/fablabchemnitz/create_links.inx
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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>Create Links (Breakaway Connectors)</name>
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<id>fablabchemnitz.de.create_links</id>
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<param name="main_tabs" type="notebook">
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<page name="settings" gui-text="Settings">
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<label appearance="header">Link Parameters</label>
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<param name="length_link" type="float" min="0.000" max="9999.000" precision="3" gui-text="Link length">1.000</param>
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<param name="length_stroke" type="float" min="0.000" max="9999.000" precision="3" gui-text="Stroke length">0.000</param>
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<param name="length_between_strokes" type="float" min="0.000" max="9999.000" precision="3" gui-text="Length between strokes">0.000</param>
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<spacer/>
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<label appearance="header">Automatic Placement</label>
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<param name="length_filter" type="bool" gui-text="Enable path length filtering">false</param>
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<param name="length_filter_value" type="float" min="0.000" max="9999.000" precision="3" gui-text="Paths with length more than">0.000</param>
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<param name="link_count" type="int" min="0" max="9999" gui-text="Link count">1</param>
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<param name="length_between_links" type="float" min="0.000" max="9999.000" precision="3" gui-text="Length between links">100.000</param>
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<separator/>
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<param name="link_offset" type="float" min="0.000" max="9999.000" precision="3" gui-text="Link offset">0.000</param>
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<param name="keep_selected" type="bool" gui-text="Keep selected elements">false</param>
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<param name="unit" type="optiongroup" appearance="combo" gui-text="Units">
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<option value="mm">mm</option>
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<option value="cm">cm</option>
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<option value="in">in</option>
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<option value="pt">pt</option>
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<option value="px">px</option>
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<option value="pc">pc</option>
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<option value="percent">%</option>
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</param>
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</page>
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<page name="about" gui-text="About">
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<label appearance="header">Create Links</label>
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<label>Stadtfabrikanten e.V. (2021)</label>
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<spacer/>
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<label>This piece of software is part of the MightyScape for InkScape 1.0/1.1dev Extension Collection</label>
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<label>you found a bug or got some fresh code? Just report to mario.voigt@stadtfabrikanten.org. Thanks!</label>
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<label appearance="url">https://fablabchemnitz.de</label>
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<label>License: GNU GPL v3</label>
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</page>
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</param>
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<effect>
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<object-type>path</object-type>
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<effects-menu>
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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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</effect>
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<script>
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<command location="inx" interpreter="python">create_links.py</command>
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</script>
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</inkscape-extension>
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extensions/fablabchemnitz/create_links.py
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extensions/fablabchemnitz/create_links.py
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#!/usr/bin/env python
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# coding=utf-8
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#
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# Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org
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# Copyright (C) 2009 Alvin Penner, penner@vaxxine.com
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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 2 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, 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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This extension converts a path into a dashed line using 'stroke-dasharray'
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It is a modification of the file addnodes.py
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It is a modification of the file convert2dash.py
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Extension to convert paths into dash-array line
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"""
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import inkex
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from inkex import bezier, CubicSuperPath, Group, PathElement
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from inkex.bezier import csplength
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import copy
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class LinksCreator(inkex.EffectExtension):
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def __init__(self):
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super(LinksCreator, self).__init__()
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self.arg_parser.add_argument("--main_tabs")
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self.arg_parser.add_argument("--length_link", type=float, default=1.000, help="Link length")
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self.arg_parser.add_argument("--length_stroke", type=float, default=0.000, help="Stroke length")
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self.arg_parser.add_argument("--length_between_strokes", type=float, default=0.000, help="Length between strokes")
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self.arg_parser.add_argument("--length_filter", type=inkex.Boolean, default=False, help="Enable path length filtering")
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self.arg_parser.add_argument("--length_filter_value", type=float, default=0.000, help="Paths with length more than")
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self.arg_parser.add_argument("--link_count", type=int, default=1, help="Link count")
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self.arg_parser.add_argument("--length_between_links", type=float, default=100.000, help="Length between links")
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self.arg_parser.add_argument("--link_offset", type=float, default=0.000, help="Link offset")
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self.arg_parser.add_argument("--keep_selected", type=inkex.Boolean, default=False, help="Keep selected elements")
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self.arg_parser.add_argument("--unit", default="mm", help="Units")
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def effect(self):
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for node in self.svg.selection.filter(PathElement).values():
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if self.options.keep_selected is True:
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parent = node.getparent()
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idx = parent.index(node)
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copynode = copy.copy(node)
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parent.insert(idx, copynode)
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# we measure the length of the path to calculate the required dash configuration
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csp = node.path.transform(node.composed_transform()).to_superpath()
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slengths, stotal = csplength(csp) #get segment lengths and total length of path in document's internal unit
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#inkex.utils.debug("total path length = {:1.3f} {}".format(self.svg.uutounit(stotal, self.options.unit), self.options.unit)) #show length, converted in selected unit
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'''
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<dasharray>
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A list of comma and/or white space separated <length>s and <percentage>s that specify the lengths of alternating dashes and gaps.
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If an odd number of values is provided, then the list of values is repeated to yield an even number of values. Thus, 5,3,2 is equivalent to 5,3,2,5,3,2.
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If we want three gaps in a path with length of 168.71 mm and a gap length of 2 mm we set the stroke-dasharray to:
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50.236 2.0 → because 3 * 50.236 mm + 3 * 2.0 mm = 168.71 mm
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examples having a circle with a circumference of length = 100:
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- the array "20 5" will create 4 dashes with length = 20 and 4 gaps with length = 5 (20 + 5 + 20 + 5 + 20 + 5 + 20 + 5 = 100)
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- the array "5 20" will create 4 dashes with length = 5 and 4 gaps with length = 20 (5 + 20 + 5 + 20 + 5 + 20 + 5 + 20 = 100)
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- the array "5 15" will create 5 dashes with length = 5 and 5 gaps with length = 15 (5 + 15 + 5 + 15 + 5 + 15 + 5 + 15 + 5 + 15 = 100)
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- the array "5 14" will create 6 dashes with length = 5 and 5 gaps with length = 15 (5 + 14 + 5 + 14 + 5 + 14 + 5 + 14 + 5 + 14 + 5 = 100) - the first dash will connect to the last dash fluently
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in the examples above we always match the full length. But we do not always match it.
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'''
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#dashes = "{:1.3f} {:1.3f}".format(((stotal / self.options.link_count) - (self.options.length_link * self.options.link_count)), self.options.length_link)
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dashes = []
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dashes.append((stotal / self.options.link_count) - (self.options.length_link * self.options.link_count))
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dashes.append(self.options.length_link)
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stroke_dasharray = ' '.join(format(dash, "1.3f") for dash in dashes)
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stroke_dashoffset = 0.0
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#inkex.utils.debug("dashes = {}".format(stroke_dasharray))
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# check if the node has a style attribute. If not we create a blank one with a black stroke and without fill
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style = None
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if node.attrib.has_key('style'):
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style = node.get('style')
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if style.endswith(';') is False:
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style += ';'
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# if has style attribute an dasharray and/or dashoffset are present we modify it accordingly
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declarations = style.split(';') # parse the style content and check what we need to adjust
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for i, decl in enumerate(declarations):
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parts = decl.split(':', 2)
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if len(parts) == 2:
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(prop, val) = parts
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prop = prop.strip().lower()
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if prop == 'stroke-dasharray': #comma separated list of one or more float values
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declarations[i] = prop + ':{};'.format(stroke_dasharray)
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if prop == 'stroke-dashoffset':
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declarations[i] = prop + ':{};'.format(stroke_dashoffset)
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node.set('style', ';'.join(declarations)) #apply new style to node
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#if has style attribute but the style attribute does not contain dasharray or dashoffset yet
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style = node.style
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if not 'stroke-dasharray' in style:
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style = style + 'stroke-dasharray:{};'.format(stroke_dasharray)
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if not 'stroke-dashoffset' in style:
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style = style + 'stroke-dashoffset:{};'.format(stroke_dashoffset)
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node.set('style', style)
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else:
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style = 'fill:none;stroke:#000000;stroke-width:1px;stroke-dasharray:{};stroke-dashoffset:{};'.format(stroke_dasharray, stroke_dashoffset)
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node.set('style', style)
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style = node.style #get the style again, but this time as style class
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new = []
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for sub in node.path.to_superpath():
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idash = 0
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dash = dashes[0]
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length = float(stroke_dashoffset)
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while dash < length:
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length = length - dash
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idash = (idash + 1) % len(dashes)
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dash = dashes[idash]
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new.append([sub[0][:]])
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i = 1
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while i < len(sub):
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dash = dash - length
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length = bezier.cspseglength(new[-1][-1], sub[i])
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while dash < length:
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new[-1][-1], nxt, sub[i] = \
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bezier.cspbezsplitatlength(new[-1][-1], sub[i], dash/length)
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if idash % 2: # create a gap
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new.append([nxt[:]])
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else: # splice the curve
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new[-1].append(nxt[:])
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length = length - dash
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idash = (idash + 1) % len(dashes)
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dash = dashes[idash]
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if idash % 2:
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new.append([sub[i]])
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else:
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new[-1].append(sub[i])
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i += 1
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#style.pop('stroke-dasharray')
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node.pop('sodipodi:type')
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node.path = CubicSuperPath(new)
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node.style = style
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if __name__ == '__main__':
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LinksCreator().run()
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