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# -*- coding: utf-8 -*-
#
# Copyright (c) 2020 Martin Owens <doctormo@gmail.com>
# Sergei Izmailov <sergei.a.izmailov@gmail.com>
# Ryan Jarvis <ryan@shopboxretail.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.
#
# pylint: disable=arguments-differ
"""
Interface for all group based elements such as Groups, Use, Markers etc.
"""
from lxml import etree # pylint: disable=unused-import
from ..paths import Path
from ..transforms import Transform
from ._utils import addNS
from ._base import ShapeElement
try:
from typing import Optional # pylint: disable=unused-import
except ImportError:
pass
class GroupBase(ShapeElement):
"""Base Group element"""
def get_path(self):
ret = Path()
for child in self:
if isinstance(child, ShapeElement):
ret += child.path.transform(child.transform)
return ret
def shape_box(self, transform=None):
bbox = None
effective_transform = Transform(transform) @ self.transform
for child in self:
if isinstance(child, ShapeElement):
child_bbox = child.bounding_box(transform=effective_transform)
if child_bbox is not None:
bbox += child_bbox
return bbox
class Group(GroupBase):
"""Any group element (layer or regular group)"""
tag_name = "g"
@classmethod
def new(cls, label, *children, **attrs):
attrs["inkscape:label"] = label
return super().new(*children, **attrs)
def effective_style(self):
"""A blend of each child's style mixed together (last child wins)"""
style = self.style
for child in self:
style.update(child.effective_style())
return style
@property
def groupmode(self):
"""Return the type of group this is"""
return self.get("inkscape:groupmode", "group")
class Layer(Group):
"""Inkscape extension of svg:g"""
def _init(self):
self.set("inkscape:groupmode", "layer")
@classmethod
def is_class_element(cls, elem):
# type: (etree.Element) -> bool
return elem.attrib.get(addNS("inkscape:groupmode"), None) == "layer"
class Anchor(GroupBase):
"""An anchor or link tag"""
tag_name = "a"
@classmethod
def new(cls, href, *children, **attrs):
attrs["xlink:href"] = href
return super().new(*children, **attrs)
class ClipPath(GroupBase):
"""A path used to clip objects"""
tag_name = "clipPath"
class Marker(GroupBase):
"""The <marker> element defines the graphic that is to be used for drawing
arrowheads or polymarkers on a given <path>, <line>, <polyline> or <polygon>
element."""
tag_name = "marker"
class Mask(GroupBase):
"""An alpha mask for compositing an object into the background
.. versionadded:: 1.2"""
tag_name = "mask"
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