New feature to calculate total length of selected edges

src/ifcblenderexport/blenderbim/bim/__init__.py

@@ -169,6 +169,7 @@ if bpy is not None:
         operator.SelectIfcPatchInput,
         operator.SelectIfcPatchOutput,
         operator.ExecuteIfcPatch,
+        operator.CalculateEdgeLengths,
         prop.StrProperty,
         prop.Variable,
         prop.Role,
@@ -213,6 +214,7 @@ if bpy is not None:
         ui.BIM_PT_documentation,
         ui.BIM_PT_bim,
         ui.BIM_PT_psets,
+        ui.BIM_PT_qto,
         ui.BIM_PT_classifications,
         ui.BIM_PT_document_information,
         ui.BIM_PT_constraints,

src/ifcblenderexport/blenderbim/bim/operator.py

@@ -3314,3 +3314,20 @@ class SelectIfcPatchOutput(bpy.types.Operator):
     def invoke(self, context, event):
         context.window_manager.fileselect_add(self)
         return {'RUNNING_MODAL'}
+
+
+class CalculateEdgeLengths(bpy.types.Operator):
+    bl_idname = 'bim.calculate_edge_lengths'
+    bl_label = 'Calculate Edge Lengths'
+
+    def execute(self, context):
+        result = 0
+        for obj in bpy.context.selected_objects:
+            if not obj.data or not obj.data.edges:
+                continue
+            for edge in obj.data.edges:
+                if edge.select:
+                    result += (obj.data.vertices[edge.vertices[1]].co -
+                        obj.data.vertices[edge.vertices[0]].co).length
+        bpy.context.scene.BIMProperties.qto_result = str(result)
+        return {'FINISHED'}

src/ifcblenderexport/blenderbim/bim/prop.py

@@ -1087,6 +1087,7 @@ class BIMProperties(PropertyGroup):
     ifc_patch_input: StringProperty(default='', name='IFC Patch Input IFC')
     ifc_patch_output: StringProperty(default='', name='IFC Patch Output IFC')
     ifc_patch_args: StringProperty(default='', name='Arguments')
+    qto_result: StringProperty(default='', name='Qto Result')
 
 
 class BCFProperties(PropertyGroup):

src/ifcblenderexport/blenderbim/bim/ui.py

@@ -69,6 +69,26 @@ class BIM_PT_object(Panel):
         row = layout.row()
         row.prop(props, 'relating_structure')
 
+        row = layout.row()
+        row.prop(props, 'material_type')
+
+        layout.label(text='Structural Boundary Condition:')
+
+        row = layout.row()
+        row.prop(props, 'has_boundary_condition')
+
+        if bpy.context.active_object.BIMObjectProperties.has_boundary_condition:
+            row = layout.row()
+            row.prop(props.boundary_condition, 'name')
+            for index, attribute in enumerate(props.boundary_condition.attributes):
+                row = layout.row(align=True)
+                row.prop(attribute, 'name', text='')
+                row.prop(attribute, 'string_value', text='')
+
+        row = layout.row()
+        row.prop(props, 'structural_member_connection')
+
+
 class BIM_PT_object_psets(Panel):
     bl_label = 'IFC Object Property Sets'
     bl_idname = 'BIM_PT_object_psets'
@@ -147,25 +167,6 @@ class BIM_PT_object_qto(Panel):
                     op.qto_index = index
                     op.prop_index = index2
 
-        row = layout.row()
-        row.prop(props, 'material_type')
-
-        layout.label(text='Structural Boundary Condition:')
-
-        row = layout.row()
-        row.prop(props, 'has_boundary_condition')
-
-        if bpy.context.active_object.BIMObjectProperties.has_boundary_condition:
-            row = layout.row()
-            row.prop(props.boundary_condition, 'name')
-            for index, attribute in enumerate(props.boundary_condition.attributes):
-                row = layout.row(align=True)
-                row.prop(attribute, 'name', text='')
-                row.prop(attribute, 'string_value', text='')
-
-        row = layout.row()
-        row.prop(props, 'structural_member_connection')
-
 
 class BIM_PT_document_information(Panel):
     bl_label = 'IFC Documents'
@@ -483,6 +484,27 @@ class BIM_PT_psets(Panel):
             row.operator('bim.remove_property_template', icon='X', text='').index = index
 
 
+class BIM_PT_qto(Panel):
+    bl_label = 'IFC Quantity Take-off'
+    bl_idname = 'BIM_PT_qto'
+    #bl_options = {'DEFAULT_CLOSED'}
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = 'scene'
+
+    def draw(self, context):
+        layout = self.layout
+        props = context.scene.BIMProperties
+
+        row = layout.row()
+        layout.label(text="Results:")
+        row = layout.row()
+        row.prop(props, 'qto_result', text='')
+
+        row = layout.row(align=True)
+        row.operator("bim.calculate_edge_lengths")
+
+
 class BIM_PT_classifications(Panel):
     bl_label = 'IFC Classifications References'
     bl_idname = 'BIM_PT_classifications'