1 files changed, 150 insertions, 0 deletions
diff --git a/share/extensions/extrude.py b/share/extensions/extrude.py
new file mode 100755
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+++ b/share/extensions/extrude.py
@@ -0,0 +1,150 @@
+#!/usr/bin/env python
+# coding=utf-8
+#
+# Copyright (C) 2022 Jonathan Neuhauser, jonathan.neuhauser@outlook.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.
+#
+"""Join paths with lines or polygons"""
+
+
+import itertools
+from typing import List, Union
+
+import inkex
+from inkex.localization import inkex_gettext as _
+from inkex.paths import ZoneClose, zoneClose, Line, Move, move
+from inkex.turtle import PathGroupBuilder, PathBuilder
+
+
+class Extrude(inkex.EffectExtension):
+    """This effect draws lines between each nth node of each selected path.
+    It can be chosen whether these regions are filled and whether the fill uses rectangles
+    or copies of the path segments.
+    The lines will be inserted between the two elements.
+    """
+
+    def add_arguments(self, pars):
+        pars.add_argument("--tab")
+        pars.add_argument(
+            "-m",
+            "--mode",
+            default="lines",
+            choices=["lines", "polygons", "snug"],
+            help='Join paths with lines, polygons or copies of the segments ("snug")',
+        )
+        pars.add_argument(
+            "-s",
+            "--subpaths",
+            default=True,
+            type=inkex.Boolean,
+            help="""If true, connecting lines will be inserted as subpaths of a single path.
+                        If false, they will be inserted in newly created group. 
+                        Only applies to mode=lines""",
+        )
+
+    @staticmethod
+    def _handle_lines(manager, com1, com2):
+        if not (
+            isinstance(com1.command, (ZoneClose, zoneClose))
+            or isinstance(com2.command, (ZoneClose, zoneClose))
+        ):
+            # For a closed subpath, the first line has already been drawn.
+            manager.Move_to(*com1.end_point)
+            manager.Line_to(*com2.end_point)
+
+    @staticmethod
+    def _handle_polygons(manager, com1, com2):
+        if not (
+            isinstance(com1.command, (Move, move))
+            or isinstance(com2.command, (Move, move))
+        ):
+            # We skip if one of either commands is a "Move" command
+            manager.Move_to(*com1.previous_end_point)
+            for point in [
+                com1.end_point,
+                com2.end_point,
+                com2.previous_end_point,
+                com1.previous_end_point,
+            ]:
+                manager.Line_to(*point)
+
+    @staticmethod
+    def _handle_snug(manager, com1, com2):
+        if not (
+            isinstance(com1.command, (Move, move))
+            or isinstance(com2.command, (Move, move))
+        ):
+            # We skip if one of either commands is a "Move" command
+            manager.Move_to(*com1.previous_end_point)
+            com1r = com1.command
+            com2r = com2.reverse()
+            doflag = True
+            if isinstance(com1r, (ZoneClose, zoneClose)):
+                # ZoneClose can not be used directly, must be converted to line
+                com1r = Line(*com1.first_point)
+                if com1.previous_end_point.is_close(com1.end_point):
+                    doflag = False
+            if doflag:
+                manager.add([com1r, Line(*com2.end_point), com2r, ZoneClose()])
+
+    def effect(self):
+        paths: List[inkex.PathElement] = []
+        for node in self.svg.selection.rendering_order().filter(inkex.ShapeElement):
+            if isinstance(node, inkex.PathElement):
+                node.apply_transform()
+            paths.append(node)
+        if len(paths) < 2:
+            raise inkex.AbortExtension(_("Need at least 2 paths selected"))
+        lines = self.options.mode.lower() == "lines"
+        subpaths = self.options.subpaths and lines
+
+        mode = (
+            self._handle_lines
+            if lines
+            else (
+                self._handle_polygons
+                if self.options.mode.lower() == "polygons"
+                else self._handle_snug
+            )
+        )
+
+        if lines:
+            style = {
+                "fill": "none",
+                "stroke": "#000000",
+                "stroke-opacity": 1,
+                "stroke-width": "1px",
+            }
+        else:
+            style = {
+                "fill": "#000000",
+                "fill-opacity": 0.3,
+                "stroke": "#000000",
+                "stroke-opacity": 0.6,
+                "stroke-width": "1px",
+                "stroke-linejoin": "round",
+            }
+
+        for pa1, pa2 in itertools.combinations(paths, 2):
+            manager = PathBuilder(style) if subpaths else PathGroupBuilder(style)
+            for com1, com2 in zip(pa1.path.proxy_iterator(), pa2.path.proxy_iterator()):
+                mode(manager, com1, com2)
+                manager.terminate()
+            manager.append_next(pa1)
+
+
+if __name__ == "__main__":
+    Extrude().run()