1 files changed, 81 insertions, 0 deletions
diff --git a/share/extensions/inkex/elements/_use.py b/share/extensions/inkex/elements/_use.py
new file mode 100644
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+++ b/share/extensions/inkex/elements/_use.py
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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().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.transform
+        copy.transform.add_translate(
+            self.to_dimensionless(self.get("x", 0)),
+            self.to_dimensionless(self.get("y", 0)),
+        )
+        copy.style = self.style + copy.style
+        self.replace_with(copy)
+        copy.set_random_ids()
+        return copy
+
+    def shape_box(self, transform=None):
+        """BoundingBox of the unclipped shape
+
+        .. versionadded:: 1.1"""
+        effective_transform = Transform(transform) @ self.transform
+        return self.href.bounding_box(effective_transform)