diff --git a/extensions/fablabchemnitz/create_links.inx b/extensions/fablabchemnitz/create_links.inx new file mode 100644 index 00000000..bc72202a --- /dev/null +++ b/extensions/fablabchemnitz/create_links.inx @@ -0,0 +1,51 @@ + + + Create Links (Breakaway Connectors) + fablabchemnitz.de.create_links + + + + 1.000 + 0.000 + 0.000 + + + false + 0.000 + 1 + 100.000 + + 0.000 + false + + + + + + + + + + + + + + + + + + + + + + path + + + + + + + + diff --git a/extensions/fablabchemnitz/create_links.py b/extensions/fablabchemnitz/create_links.py new file mode 100644 index 00000000..57c6e113 --- /dev/null +++ b/extensions/fablabchemnitz/create_links.py @@ -0,0 +1,156 @@ +#!/usr/bin/env python +# coding=utf-8 +# +# Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org +# Copyright (C) 2009 Alvin Penner, penner@vaxxine.com +# +# 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 2 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, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +# +""" +This extension converts a path into a dashed line using 'stroke-dasharray' +It is a modification of the file addnodes.py +It is a modification of the file convert2dash.py +Extension to convert paths into dash-array line + +""" +import inkex +from inkex import bezier, CubicSuperPath, Group, PathElement +from inkex.bezier import csplength +import copy + +class LinksCreator(inkex.EffectExtension): + def __init__(self): + super(LinksCreator, self).__init__() + self.arg_parser.add_argument("--main_tabs") + self.arg_parser.add_argument("--length_link", type=float, default=1.000, help="Link length") + self.arg_parser.add_argument("--length_stroke", type=float, default=0.000, help="Stroke length") + self.arg_parser.add_argument("--length_between_strokes", type=float, default=0.000, help="Length between strokes") + self.arg_parser.add_argument("--length_filter", type=inkex.Boolean, default=False, help="Enable path length filtering") + self.arg_parser.add_argument("--length_filter_value", type=float, default=0.000, help="Paths with length more than") + self.arg_parser.add_argument("--link_count", type=int, default=1, help="Link count") + self.arg_parser.add_argument("--length_between_links", type=float, default=100.000, help="Length between links") + + self.arg_parser.add_argument("--link_offset", type=float, default=0.000, help="Link offset") + self.arg_parser.add_argument("--keep_selected", type=inkex.Boolean, default=False, help="Keep selected elements") + self.arg_parser.add_argument("--unit", default="mm", help="Units") + + def effect(self): + for node in self.svg.selection.filter(PathElement).values(): + + if self.options.keep_selected is True: + parent = node.getparent() + idx = parent.index(node) + copynode = copy.copy(node) + parent.insert(idx, copynode) + + # we measure the length of the path to calculate the required dash configuration + csp = node.path.transform(node.composed_transform()).to_superpath() + slengths, stotal = csplength(csp) #get segment lengths and total length of path in document's internal unit + #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 + + ''' + + A list of comma and/or white space separated s and s that specify the lengths of alternating dashes and gaps. + 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. + + 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: + 50.236 2.0 → because 3 * 50.236 mm + 3 * 2.0 mm = 168.71 mm + + examples having a circle with a circumference of length = 100: + - 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) + - 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) + - 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) + - 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 + in the examples above we always match the full length. But we do not always match it. + ''' + #dashes = "{:1.3f} {:1.3f}".format(((stotal / self.options.link_count) - (self.options.length_link * self.options.link_count)), self.options.length_link) + dashes = [] + dashes.append((stotal / self.options.link_count) - (self.options.length_link * self.options.link_count)) + dashes.append(self.options.length_link) + + stroke_dasharray = ' '.join(format(dash, "1.3f") for dash in dashes) + stroke_dashoffset = 0.0 + + #inkex.utils.debug("dashes = {}".format(stroke_dasharray)) + + # check if the node has a style attribute. If not we create a blank one with a black stroke and without fill + style = None + if node.attrib.has_key('style'): + style = node.get('style') + if style.endswith(';') is False: + style += ';' + + # if has style attribute an dasharray and/or dashoffset are present we modify it accordingly + declarations = style.split(';') # parse the style content and check what we need to adjust + for i, decl in enumerate(declarations): + parts = decl.split(':', 2) + if len(parts) == 2: + (prop, val) = parts + prop = prop.strip().lower() + if prop == 'stroke-dasharray': #comma separated list of one or more float values + declarations[i] = prop + ':{};'.format(stroke_dasharray) + if prop == 'stroke-dashoffset': + declarations[i] = prop + ':{};'.format(stroke_dashoffset) + node.set('style', ';'.join(declarations)) #apply new style to node + + #if has style attribute but the style attribute does not contain dasharray or dashoffset yet + style = node.style + if not 'stroke-dasharray' in style: + style = style + 'stroke-dasharray:{};'.format(stroke_dasharray) + if not 'stroke-dashoffset' in style: + style = style + 'stroke-dashoffset:{};'.format(stroke_dashoffset) + node.set('style', style) + else: + style = 'fill:none;stroke:#000000;stroke-width:1px;stroke-dasharray:{};stroke-dashoffset:{};'.format(stroke_dasharray, stroke_dashoffset) + node.set('style', style) + + style = node.style #get the style again, but this time as style class + + new = [] + for sub in node.path.to_superpath(): + idash = 0 + dash = dashes[0] + length = float(stroke_dashoffset) + while dash < length: + length = length - dash + idash = (idash + 1) % len(dashes) + dash = dashes[idash] + new.append([sub[0][:]]) + i = 1 + while i < len(sub): + dash = dash - length + length = bezier.cspseglength(new[-1][-1], sub[i]) + while dash < length: + new[-1][-1], nxt, sub[i] = \ + bezier.cspbezsplitatlength(new[-1][-1], sub[i], dash/length) + if idash % 2: # create a gap + new.append([nxt[:]]) + else: # splice the curve + new[-1].append(nxt[:]) + length = length - dash + idash = (idash + 1) % len(dashes) + dash = dashes[idash] + if idash % 2: + new.append([sub[i]]) + else: + new[-1].append(sub[i]) + i += 1 + #style.pop('stroke-dasharray') + node.pop('sodipodi:type') + node.path = CubicSuperPath(new) + node.style = style + +if __name__ == '__main__': + LinksCreator().run() \ No newline at end of file