Start: Can display svg and get mouse events and coordinates

coordinates_extension.inx

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+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+  <name>Georeference</name>
+  <id>org.smolnet.code.inkscape-coordinates</id>
+  <description>Geo reference an image</description>
+  <effect>
+    <effects-menu>
+      <submenu name="Georeference"/>
+    </effects-menu>
+  </effect>
+  <script>
+    <command location="inx" interpreter="python">coordinates_extension.py</command>
+  </script>
+</inkscape-extension>

coordinates_extension.py

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+#!/usr/bin/env python3
+# coding=utf-8
+#
+# Copyright (C) 2022 Mikael Nordin, hej@mic.ke
+#
+# 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. # noqa: E501
+#
+"""
+Description of this extension
+"""
+import inkex
+import inkex.gui
+import gi
+
+gi.require_version("Gtk", "3.0")
+gi.require_version("Gdk", "3.0")
+from gi.repository import Gtk, Gdk  # noqa: E402
+
+
+class GeoReferencerWindow(Gtk.Window):
+    def __init__(self, svg):
+        super().__init__(title="Georeferencer")
+        self.svg = svg
+        self.set_events(Gdk.EventMask.POINTER_MOTION_MASK |
+                        Gdk.EventMask.BUTTON_PRESS_MASK)
+        self.box = Gtk.Box()
+        self.add(self.box)
+        self.button = Gtk.Button(label="Georeference")
+        self.button.connect("clicked", self.on_button_clicked)
+        self.box.pack_start(self.button, True, True, 0)
+        self.pix_man = inkex.gui.pixmap.PixmapManager()
+        self.pixmap = self.pix_man.get_pixmap(self.svg)
+        self.event_box = Gtk.EventBox()
+        self.image = Gtk.Image.new_from_pixbuf(self.pixmap)
+        self.event_box.add(self.image)
+        self.event_box.set_above_child(above_child=True)
+        self.event_box.connect('motion-notify-event', self.on_motion_notify)
+        self.event_box.connect('enter-notify-event', self.on_motion_notify)
+        self.event_box.connect('button-press-event', self.on_mouse_click)
+        self.box.pack_start(self.event_box, True, True, 0)
+        self.connect("destroy", Gtk.main_quit)
+
+    def on_button_clicked(self, widget):
+        self.destroy()
+
+    def on_motion_notify(self, widget, event):
+        widget.set_tooltip_text("x:{}, y:{}".format(event.x, event.y))
+
+    def on_mouse_click(self, widget, event):
+        widget.set_tooltip_text("HAHA x:{}, y:{}".format(event.x, event.y))
+
+
+class CoordinatesExtension(inkex.EffectExtension):
+
+    def effect(self):
+        self.window = GeoReferencerWindow(self.svg.tostring())
+        self.window.show_all()
+        self.eventloop = Gtk.main()
+
+
+if __name__ == '__main__':
+    CoordinatesExtension().run()

coordinates_test.py

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+#!/usr/bin/env python
+# coding=utf-8
+"""
+Test elements extra logic from svg xml lxml custom classes.
+"""
+
+from inkex.tester import TestCase
+from inkex.tester.inx import InxMixin
+
+from my_effect_extension import UnnamedEffectExtension
+
+import sys
+sys.path.insert(0, '.')
+
+class UnnamedBasicTestCase(InxMixin, TestCase):
+    """Test INX files and other things"""
+    def test_inx_file(self):
+        """Get all inx files and test each of them"""
+        self.assertInxIsGood("tutorial_01.inx")
+
+    def test_other_things(self):
+        """Things work out"""
+        pass
+
+class UnnamedComparisonsTestCase(ComparisonMixin, TestCase):
+    """Test input and output variations"""
+    effect_class = UnnamedEffectExtension
+    comparisons = [
+        ('--my_option=True',),
+        ('--my_option=False',),
+    ]