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+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2020 Martin Owens <doctormo@gmail.com>
+# Thomas Holder <thomas.holder@schrodinger.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.
+#
+"""
+Interface for the Use and Symbol elements
+"""
+
+from ..transforms import Transform
+
+from ._groups import Group, GroupBase
+from ._base import ShapeElement
+
+class Symbol(GroupBase):
+ """SVG symbol element"""
+ tag_name = 'symbol'
+
+class Use(ShapeElement):
+ """A 'use' element that links to another in the document"""
+ tag_name = 'use'
+
+ @classmethod
+ def new(cls, elem, x, y, **attrs): # pylint: disable=arguments-differ
+ ret = super(Use, cls).new(x=x, y=y, **attrs)
+ ret.href = elem
+ return ret
+
+ def get_path(self):
+ """Returns the path of the cloned href plus any transformation"""
+ path = self.href.path
+ path.transform(self.href.transform)
+ return path
+
+ def effective_style(self):
+ """Href's style plus this object's own styles"""
+ style = self.href.effective_style()
+ style.update(self.style)
+ return style
+
+ def unlink(self):
+ """Unlink this clone, replacing it with a copy of the original"""
+ copy = self.href.copy()
+ if isinstance(copy, Symbol):
+ group = Group(**copy.attrib)
+ group.extend(copy)
+ copy = group
+ copy.transform *= self.transform
+ copy.style = self.style + copy.style
+ self.replace_with(copy)
+ copy.set_random_ids()
+ return copy
+
+ def shape_box(self, transform=None):
+ effective_transform = Transform(transform) * self.transform
+ return self.href.bounding_box(effective_transform)