#!/usr/bin/env python # coding=utf-8 # # Copyright (C) 2005 Aaron Spike, aaron@ekips.org # # 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. # import copy from collections import namedtuple from itertools import combinations import inkex from inkex.styles import Style from inkex.utils import pairwise from inkex.paths import CubicSuperPath from inkex.tween import interppoints from inkex.bezier import csplength, cspbezsplitatlength, cspbezsplit, bezlenapprx class Interp(inkex.EffectExtension): def add_arguments(self, pars): pars.add_argument("-e", "--exponent", type=float, default=0.0,\ help="values other than zero give non linear interpolation") pars.add_argument("-s", "--steps", type=int, default=5,\ help="number of interpolation steps") pars.add_argument("-m", "--method", type=int, default=2,\ help="method of interpolation") pars.add_argument("-d", "--dup", type=inkex.Boolean, default=True,\ help="duplicate endpaths") pars.add_argument("--style", type=inkex.Boolean, default=True,\ help="try interpolation of some style properties") pars.add_argument("--zsort", type=inkex.Boolean, default=False,\ help="use z-order instead of selection order") def effect(self): exponent = self.options.exponent if exponent >= 0: exponent += 1.0 else: exponent = 1.0 / (1.0 - exponent) steps = [1.0 / (self.options.steps + 1.0)] for i in range(self.options.steps - 1): steps.append(steps[0] + steps[-1]) steps = [step ** exponent for step in steps] if self.options.zsort: # work around selection order swapping with Live Preview objects = self.svg.get_z_selected() else: # use selection order (default) objects = self.svg.selected objects = [node for node in objects.values() if isinstance(node, inkex.PathElement)] # prevents modification of original objects objects = copy.deepcopy(objects) for node in objects: node.apply_transform() objectpairs = pairwise(objects, start=False) for (elem1, elem2) in objectpairs: start = elem1.path.to_superpath() end = elem2.path.to_superpath() sst = copy.deepcopy(elem1.style) est = copy.deepcopy(elem2.style) basestyle = copy.deepcopy(sst) if 'stroke-width' in basestyle: basestyle['stroke-width'] = sst.interpolate_prop(est, 0, 'stroke-width') # prepare for experimental style tweening if self.options.style: styledefaults = Style( {'opacity': 1.0, 'stroke-opacity': 1.0, 'fill-opacity': 1.0, 'stroke-width': 1.0, 'stroke': None, 'fill': None}) for key in styledefaults: sst.setdefault(key, styledefaults[key]) est.setdefault(key, styledefaults[key]) isnotplain = lambda x: not (x == 'none' or x[:1] == '#') isgradient = lambda x: x.startswith('url(#') if isgradient(sst['stroke']) and isgradient(est['stroke']): strokestyle = 'gradient' elif isnotplain(sst['stroke']) or isnotplain(est['stroke']) or (sst['stroke'] == 'none' and est['stroke'] == 'none'): strokestyle = 'notplain' else: strokestyle = 'color' if isgradient(sst['fill']) and isgradient(est['fill']): fillstyle = 'gradient' elif isnotplain(sst['fill']) or isnotplain(est['fill']) or (sst['fill'] == 'none' and est['fill'] == 'none'): fillstyle = 'notplain' else: fillstyle = 'color' if strokestyle is 'color': if sst['stroke'] == 'none': sst['stroke-width'] = '0.0' sst['stroke-opacity'] = '0.0' sst['stroke'] = est['stroke'] elif est['stroke'] == 'none': est['stroke-width'] = '0.0' est['stroke-opacity'] = '0.0' est['stroke'] = sst['stroke'] if fillstyle is 'color': if sst['fill'] == 'none': sst['fill-opacity'] = '0.0' sst['fill'] = est['fill'] elif est['fill'] == 'none': est['fill-opacity'] = '0.0' est['fill'] = sst['fill'] if self.options.method == 2: # subdivide both paths into segments of relatively equal lengths slengths, stotal = csplength(start) elengths, etotal = csplength(end) lengths = {} t = 0 for sp in slengths: for l in sp: t += l / stotal lengths.setdefault(t, 0) lengths[t] += 1 t = 0 for sp in elengths: for l in sp: t += l / etotal lengths.setdefault(t, 0) lengths[t] += -1 sadd = [k for (k, v) in lengths.items() if v < 0] sadd.sort() eadd = [k for (k, v) in lengths.items() if v > 0] eadd.sort() t = 0 s = [[]] for sp in slengths: if not start[0]: s.append(start.pop(0)) s[-1].append(start[0].pop(0)) for l in sp: pt = t t += l / stotal if sadd and t > sadd[0]: while sadd and sadd[0] < t: nt = (sadd[0] - pt) / (t - pt) bezes = cspbezsplitatlength(s[-1][-1][:], start[0][0][:], nt) s[-1][-1:] = bezes[:2] start[0][0] = bezes[2] pt = sadd.pop(0) s[-1].append(start[0].pop(0)) t = 0 e = [[]] for sp in elengths: if not end[0]: e.append(end.pop(0)) e[-1].append(end[0].pop(0)) for l in sp: pt = t t += l / etotal if eadd and t > eadd[0]: while eadd and eadd[0] < t: nt = (eadd[0] - pt) / (t - pt) bezes = cspbezsplitatlength(e[-1][-1][:], end[0][0][:], nt) e[-1][-1:] = bezes[:2] end[0][0] = bezes[2] pt = eadd.pop(0) e[-1].append(end[0].pop(0)) start = s[:] end = e[:] else: # which path has fewer segments? lengthdiff = len(start) - len(end) # swap shortest first if lengthdiff > 0: start, end = end, start # subdivide the shorter path for x in range(abs(lengthdiff)): maxlen = 0 subpath = 0 segment = 0 for y in range(len(start)): for z in range(1, len(start[y])): leng = bezlenapprx(start[y][z - 1], start[y][z]) if leng > maxlen: maxlen = leng subpath = y segment = z sp1, sp2 = start[subpath][segment - 1:segment + 1] start[subpath][segment - 1:segment + 1] = cspbezsplit(sp1, sp2) # if swapped, swap them back if lengthdiff > 0: start, end = end, start # break paths so that corresponding subpaths have an equal number of segments s = [[]] e = [[]] while start and end: if start[0] and end[0]: s[-1].append(start[0].pop(0)) e[-1].append(end[0].pop(0)) elif end[0]: s.append(start.pop(0)) e[-1].append(end[0][0]) e.append([end[0].pop(0)]) elif start[0]: e.append(end.pop(0)) s[-1].append(start[0][0]) s.append([start[0].pop(0)]) else: s.append(start.pop(0)) e.append(end.pop(0)) if self.options.dup: steps = [0] + steps + [1] # create an interpolated path for each interval group = self.svg.get_current_layer().add(inkex.Group()) for time in steps: interp = [] # process subpaths for ssp, esp in zip(s, e): if not (ssp or esp): break interp.append([]) # process superpoints for sp, ep in zip(ssp, esp): if not (sp or ep): break interp[-1].append([]) # process points for p1, p2 in zip(sp, ep): if not (sp or ep): break interp[-1][-1].append(interppoints(p1, p2, time)) # remove final subpath if empty. if not interp[-1]: del interp[-1] # basic style interpolation if self.options.style: basestyle.update(sst.interpolate(est, time)) for prop in ['stroke', 'fill']: if isgradient(sst[prop]) and isgradient(est[prop]): gradid1 = sst[prop][4:-1] gradid2 = est[prop][4:-1] grad1 = self.svg.getElementById(gradid1) grad2 = self.svg.getElementById(gradid2) newgrad = grad1.interpolate(grad2, time) stops, orientation = newgrad.stops_and_orientation() self.svg.defs.add(orientation) basestyle[prop] = 'url(#{})'.format(orientation.get_id()) if len(stops): self.svg.defs.add(stops, orientation) orientation.set('xlink:href', '#{}'.format(stops.get_id())) new = group.add(inkex.PathElement()) new.style = basestyle new.path = CubicSuperPath(interp) if __name__ == '__main__': Interp().run()