New feature to calculate the radius of a polygonal circle

src/blenderbim/blenderbim/tool/__init__.py

@@ -25,6 +25,7 @@ from blenderbim.tool.ifc import Ifc
 from blenderbim.tool.material import Material
 from blenderbim.tool.misc import Misc
 from blenderbim.tool.owner import Owner
+from blenderbim.tool.qto import Qto
 from blenderbim.tool.root import Root
 from blenderbim.tool.spatial import Spatial
 from blenderbim.tool.style import Style

src/blenderbim/blenderbim/tool/qto.py

@@ -0,0 +1,37 @@
+# BlenderBIM Add-on - OpenBIM Blender Add-on
+# Copyright (C) 2021 Dion Moult <dion@thinkmoult.com>
+#
+# This file is part of BlenderBIM Add-on.
+#
+# BlenderBIM Add-on 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 3 of the License, or
+# (at your option) any later version.
+#
+# BlenderBIM Add-on 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 BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
+
+import bpy
+import blenderbim.core.tool
+import blenderbim.tool as tool
+from mathutils import Vector
+
+
+class Qto(blenderbim.core.tool.Qto):
+    @classmethod
+    def get_radius_of_selected_vertices(cls, obj):
+        selected_verts = [v.co for v in obj.data.vertices if v.select]
+        total = Vector()
+        for v in selected_verts:
+            total += v
+        circle_center = total / len(selected_verts)
+        return max([(v - circle_center).length for v in selected_verts])
+
+    @classmethod
+    def set_qto_result(cls, result):
+        bpy.context.scene.BIMQtoProperties.qto_result = str(round(result, 3))