AMEND ME!!!

Assets/avatar-example/mesh/blend~/ui_bone_size.py

@@ -0,0 +1,91 @@
+import bpy
+from bpy.props import FloatProperty
+from bpy.types import Context, Operator, Panel
+
+
+class ArmEditOperator:
+    @classmethod
+    def poll(cls, context: Context):
+        return (
+            context.active_object
+            and context.active_object.type == 'ARMATURE'
+            and context.active_bone
+            and context.mode == 'EDIT_ARMATURE'
+        )
+
+
+class ARMATURE_OT_ReadBoneLength(ArmEditOperator, Operator):
+    """Make length property equal to actual bone length"""
+    bl_idname = "armature.read_bone_length"
+    bl_label = "Read Bone Length"
+    bl_options = {'UNDO'}
+
+    def execute(self, context):
+        context.active_bone.bbone_y = context.active_bone.length
+        return {'FINISHED'}
+
+
+class ARMATURE_OT_MakeBoneSquare(ArmEditOperator, Operator):
+    """Make bone's width and depth equal to it's length"""
+    bl_idname = "armature.make_bone_square"
+    bl_label = "Make Bone Square"
+    bl_options = {'UNDO'}
+
+    def execute(self, context):
+        context.active_bone.bbone_x = context.active_bone.bbone_z = context.active_bone.length * 0.5
+        return {'FINISHED'}
+
+
+class VIEW3D_PT_bone_size(Panel):
+    bl_space_type = 'VIEW_3D'
+    bl_region_type = 'UI'
+    bl_label = "Bone Size"
+    bl_options = {'DEFAULT_CLOSED'}
+
+    @classmethod
+    def poll(cls, context: Context):
+        scene = context.space_data
+        ob = context.active_object
+        return scene and ob and ob.type == 'ARMATURE' and ob.mode == 'EDIT'
+
+    def draw(self, context: Context):
+        layout = self.layout
+
+        col = layout.column()
+        col.prop(context.active_bone, "bbone_x", text="Bone Width")
+        col.prop(context.active_bone, "bbone_z", text="Bone Depth")
+        sub = col.row(align=True)
+        sub.operator(ARMATURE_OT_ReadBoneLength.bl_idname, icon="COPYDOWN", text="")
+        sub.prop(context.active_bone, "bbone_y", text="Bone Length")
+        col.operator(ARMATURE_OT_MakeBoneSquare.bl_idname, icon="MESH_PLANE")
+
+
+def update_length(self, context) -> None:
+    context.active_bone.length = self.bbone_y
+
+
+def register():
+    bpy.types.EditBone.bbone_y = FloatProperty(
+        name="B-Bone Display Y Length",
+        description="B-Bone Y size",
+        default=1.0,
+        min=0.0,
+        soft_min=0.001,
+        step=10,
+        precision=3,
+        options={'HIDDEN'},
+        update=update_length,
+    )
+    bpy.utils.register_class(ARMATURE_OT_ReadBoneLength)
+    bpy.utils.register_class(ARMATURE_OT_MakeBoneSquare)
+    bpy.utils.register_class(VIEW3D_PT_bone_size)
+
+
+def unregister():
+    bpy.utils.unregister_class(VIEW3D_PT_bone_size)
+    bpy.utils.unregister_class(ARMATURE_OT_MakeBoneSquare)
+    bpy.utils.unregister_class(ARMATURE_OT_ReadBoneLength)
+    del bpy.types.EditBone.bbone_y
+
+
+register()