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#!/usr/bin/env python
# coding=utf-8
#
# Copyright (C) 2009 Aurelio A. Heckert, aurium (a) gmail dot 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.
#
"""
Interpolation of attributes in selected objects or group's children.
"""
import inkex
from inkex.localization import inkex_gettext as _
from inkex.tween import ColorInterpolator, ValueInterpolator, AttributeInterpolator
from inkex.utils import is_number
class InterpAttG(inkex.EffectExtension):
"""
This effect applies a value for any interpolatable attribute for all
elements inside the selected group or for all elements in a multiple selection.
"""
def __init__(self):
super(InterpAttG, self).__init__()
self.arg_parser.add_argument(
"-a",
"--att",
type=str,
dest="att",
default="width",
help="Attribute to be interpolated.",
)
self.arg_parser.add_argument(
"-o",
"--att-other",
type=str,
dest="att_other",
help="Other attribute (for a limited UI).",
)
self.arg_parser.add_argument(
"-t",
"--att-other-type",
type=self.arg_class([ColorInterpolator, ValueInterpolator]),
dest="att_other_type",
help="The other attribute type.",
)
self.arg_parser.add_argument(
"-w",
"--att-other-where",
type=str,
dest="att_other_where",
default="tag",
help="That is a tag attribute or a style attribute?",
)
self.arg_parser.add_argument(
"-s",
"--start-val",
type=str,
dest="start_val",
default="#F00",
help="Initial interpolation value.",
)
self.arg_parser.add_argument(
"-e",
"--end-val",
type=str,
dest="end_val",
default="#00F",
help="End interpolation value.",
)
self.arg_parser.add_argument(
"-u", "--unit", type=str, dest="unit", default="none", help="Values unit."
)
self.arg_parser.add_argument(
"--zsort",
type=inkex.Boolean,
dest="zsort",
default=False,
help="use z-order instead of selection order",
)
self.arg_parser.add_argument(
"--tab",
type=str,
dest="tab",
help="The selected UI-tab when OK was pressed",
)
def get_elements(self):
"""Returns a list of elements to work on"""
if not self.svg.selection:
return []
if len(self.svg.selection) > 1:
# multiple selection
if self.options.zsort:
return list(self.svg.selection.rendering_order().values())
return list(self.svg.selection.values())
# must be a group
node = self.svg.selection.filter(inkex.Group).first()
return list(node) or []
def create_dummy_nodes(self, path):
"""Create dummy nodes to use the interpolation classes defined in inkex.tween"""
pat1 = inkex.PathElement()
pat2 = inkex.PathElement()
start_value = self.options.start_val.replace(",", ".")
end_value = self.options.end_val.replace(",", ".")
if self.options.unit != "none":
start_value += self.options.unit
end_value += self.options.unit
self.apply_value(pat1, path, start_value)
self.apply_value(pat2, path, end_value)
return pat1, pat2
@staticmethod
def apply_value(node, path, value):
"""Applies a value to a given node. If path starts with "transform/" or "style/", the
value is applied to either transform or style."""
if path.startswith("style/"):
att_name = path[6:]
node.style[att_name] = value
elif path.startswith("transform/"):
if not is_number(value):
raise inkex.AbortExtension(
_("Unable to set attribute {} to {}").format(path, value)
)
if path == "transform/trans-x":
node.transform.add_translate(value, 0)
elif path == "transform/trans-y":
node.transform.add_translate(0, value)
elif path == "transform/scale":
node.transform.add_scale(value)
elif path == "transform":
node.transform @= value
else:
node.set(path, value)
def effect(self):
method = None
if self.options.att == "other":
if self.options.att_other is None:
raise inkex.AbortExtension(
_("You selected 'Other'. Please enter an attribute to interpolate.")
)
if self.options.att_other_where == "tag":
path = self.options.att_other
else:
path = self.options.att_other_where + "/" + self.options.att_other
method = self.options.att_other_type
else:
path = self.options.att
if self.options.att == "height" or self.options.att == "width":
method = inkex.tween.UnitValueInterpolator
path1, path2 = self.create_dummy_nodes(path)
if path.startswith("transform"):
path = "transform"
try:
# maybe tween knows what do do with this attribute?
interpolator = AttributeInterpolator.create_from_attribute(
path1, path2, path, None
)
except:
# okay, apparently not
interpolator = AttributeInterpolator.create_from_attribute(
path1, path2, path, method
)
collection = self.get_elements()
if not collection:
raise inkex.AbortExtension(_("There is no selection to interpolate"))
steps = [1.0 / (len(collection) - 1) * i for i in range(len(collection))]
for time, node in zip(steps, collection):
new_value = interpolator.interpolate(time)
InterpAttG.apply_value(node, path, new_value)
return True
if __name__ == "__main__":
InterpAttG().run()
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