217 lines
8.9 KiB
Python
217 lines
8.9 KiB
Python
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#!/usr/bin/env python3
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"""
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line animator - create CSS3 animations that look as if someone is drawing them by hand
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Copyright (C) 2018-2021, Maren Hachmann <marenhachmann@yahoo.com>
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using path length measuring code from measure.py, written by:
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Copyright (C) 2015 ~suv <suv-sf@users.sf.net>
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Copyright (C) 2010 Alvin Penner
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Copyright (C) 2006 Georg Wiora
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Copyright (C) 2006 Nathan Hurst
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Copyright (C) 2005 Aaron Spike, aaron@ekips.org
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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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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__version__ = 1.0
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import re
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import sys
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from lxml import etree
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# local libraries
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import inkex
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from inkex.bezier import csplength
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# TODO:
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# - do not add class style tag with anything but animation name list (needs to be parsed! animation-name: animation_1, animation_2;), but repeat all the other data for each path. This is the only way to add two different animations to a single path.
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# - fix delay
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# - implement removal of animations
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class LineAnimator(inkex.EffectExtension):
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def add_arguments(self, pars):
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pars.add_argument("--duration", type=float, default=10.0, help="Duration in seconds")
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pars.add_argument("--repeat", type=int, default=1, help="Number of repetitions for looping, 0 means infinite")
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pars.add_argument("--delay", type=float, default=0.0, help="Delay of animation start in seconds")
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pars.add_argument("--identifier", default="animation_1", help="Unique identifier for the animation (only A-Z, a-z, 0-1, _)")
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pars.add_argument("--remove_from", default="selected", help="Remove animations from selected items")
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pars.add_argument("--action", default="add_anim", help="The active tab when Apply is pressed.")
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pars.add_argument("--timing", default="ease")
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def effect(self):
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self.root = self.document.getroot()
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id_regex = re.compile('^[a-zA-Z0-9_]+$')
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if not id_regex.match(self.options.identifier):
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inkex.errormsg(_("Please make sure that the animation's name does not contain any other characters than uppercase or lowercase letters from A to Z, numbers from 0 to 9, or underscores."))
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if self.options.repeat == 0:
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self.options.repeat = "infinite"
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if self.options.action == 'remove_anim':
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if self.options.remove_from == 'selected':
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self.remove_selected()
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else:
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self.remove_all()
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elif len(self.svg.selected):
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self.add_animation(self.options.identifier,
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self.options.duration,
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self.options.delay,
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self.options.repeat,
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self.options.timing)
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if self.options.delay > 0:
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self.add_animation("delay_{0}".format(self.options.identifier),
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self.options.delay,
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0,
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1,
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"linear",
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True)
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else:
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inkex.errormsg(_('Please select one or more paths to animate.'))
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def add_animation(self, id, duration, delay, repetitions, timing, is_delay_anim=False):
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animation_style_id = "anim_{0}".format(id)
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# inkex.utils.debug('animation_style_id: '+animation_style_id)
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to_animate = []
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for thing in self.svg.selection.paint_order():
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to_animate.append(thing)
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lengths = [] # relevant lengths of all subsequently animated paths
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for element in to_animate:
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if element.tag == inkex.addNS('path','svg'):
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lengths.append(self.get_animatable_length(element))
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else:
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inkex.errormsg(_('At least one of the selected objects is not a path: {}\nPlease convert all objects to paths before running this extension.\n').format(element.get('id')))
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total_length = sum(lengths)
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#inkex.utils.debug(total_length)
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#inkex.utils.debug(lengths)
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end_percent = 0
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for index, length in enumerate(lengths):
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# if we're creating an animation just to
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# hide a path during delay time
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if is_delay_anim == True:
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# TODO: fix delay!
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inkex.errormsg(_("Sorry, delay isn't working currently. Please set back to zero."))
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sys.exit()
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self.animate_path(to_animate[index], 0, 100, length, length, length, animation_style_id, True)
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else:
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# start where we ended before
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start_percent = end_percent
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# compute new end
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end_percent += round(length/total_length*100, 3)
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if end_percent > 100:
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end_percent = 100
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self.animate_path(to_animate[index], start_percent, end_percent, length, length, 0, animation_style_id, is_delay_anim)
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animation_style_content = """
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.{id} {{
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animation-duration: {duration}s;
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animation-timing-function: {timing};
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animation-delay: {delay}s;
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animation-iteration-count: {repetitions};
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animation-fill-mode: forwards;
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}}\n""".format(id=animation_style_id, duration=duration, delay=delay, repetitions=repetitions, timing=timing)
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# create general style tag for animation that applies to all objects
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self.add_or_replace_style_tag(animation_style_id, animation_style_content)
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def animate_path(self, element, start_percent, end_percent, length, start_length, end_length, animation_identifier, is_delay_anim=False):
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path_identifier = element.get('id')
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animation_name = path_identifier
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if is_delay_anim:
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animation_name = 'delay_'+path_identifier
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path_style_content = """
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#{id} {{
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animation-name: {animation_name};
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stroke-dasharray: {length} !important;
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}}
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@keyframes {animation_name} {{
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0%, {start_percent}% {{stroke-dashoffset: {start_length};}}
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{end_percent}%, 100% {{stroke-dashoffset: {end_length};}}
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}}\n""".format(id=path_identifier,
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animation_name=animation_name,
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length=length,
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start_percent=start_percent,
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start_length=start_length,
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end_percent=end_percent,
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end_length=end_length)
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# inkex.utils.debug(path_style_content)
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# inkex.utils.debug('self.add_or_replace_style_tag('+'pathanim_' + animation_name + ','+path_style_content+')')
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self.add_or_replace_style_tag('pathanim_' + animation_name, path_style_content)
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# only change the element's class when we add the real animation
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if is_delay_anim == False:
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element.set("class", animation_identifier)
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def get_animatable_length(self, elem):
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# csp = elem.path.transform(elem.composed_transform()).to_superpath()
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csp = elem.path.to_superpath()
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subpath_lengths, path_length = csplength(csp)
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# if there are subpaths, we do not want to extend the animation
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# for longer than necessary (subpaths are animated in parallel)
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if len(subpath_lengths) > 1:
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path_length = max([sum(subpath_segments) for subpath_segments in subpath_lengths])
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return path_length
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def add_or_replace_style_tag(self, tag_id, content):
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# inkex.utils.debug(tag_id)
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old_tag = self.get_style_tag(tag_id)
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# inkex.utils.debug('old_tag: '+str(old_tag))
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if old_tag != False:
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(self.root.remove(old_tag))
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style_tag = etree.SubElement(self.root, 'style', {'id': tag_id})
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style_tag.text = content
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def get_style_tags(self):
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style_tags = []
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for element in self.root.getchildren():
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if element.tag == inkex.addNS('style', 'svg'):
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style_tags.append(element)
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return(style_tags)
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def get_style_tag(self, id):
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for tag in self.get_style_tags():
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if tag.get('id') == id:
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return tag
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return False
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def remove_all(self):
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inkex.utils.debug('Removing all not implemented yet.')
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def remove_selected(self):
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if len(self.svg.selected) == 0:
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inkex.errormsg(_("Please select items to remove the animation from."))
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inkex.utils.debug('Removing selected not implemented yet.')
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if __name__ == '__main__':
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LineAnimator().run()
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