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Classes Section
===============
The CLASSES section in DXF files holds the information for application-defined classes
whose instances appear in :class:`~ezdxf.layouts.Layout` objects. As usual package user
there is no need to bother about CLASSES.
.. seealso::
DXF Internals: :ref:`classes_section_internals`
.. module:: ezdxf.sections.classes
.. class:: ClassesSection
.. attribute:: classes
Storage of all :class:`~ezdxf.entities.DXFClass` objects, they are not stored in
the entities database, because CLASS instances do not have a handle attribute.
.. method:: register
.. automethod:: add_class
.. automethod:: get
.. automethod:: add_required_classes
.. automethod:: update_instance_counters
.. module:: ezdxf.entities
:noindex:
.. class:: DXFClass
Information about application-defined classes.
.. attribute:: dxf.name
Class DXF record name.
.. attribute:: dxf.cpp_class_name
C++ class name. Used to bind with software that defines object class behavior.
.. attribute:: dxf.app_name
Application name. Posted in Alert box when a class definition listed in this section is not currently loaded.
.. attribute:: dxf.flags
Proxy capabilities flag
======= =========================
0 No operations allowed (0)
1 Erase allowed (0x1)
2 Transform allowed (0x2)
4 Color change allowed (0x4)
8 Layer change allowed (0x8)
16 Linetype change allowed (0x10)
32 Linetype scale change allowed (0x20)
64 Visibility change allowed (0x40)
128 Cloning allowed (0x80)
256 Lineweight change allowed (0x100)
512 Plot Style Name change allowed (0x200)
895 All operations except cloning allowed (0x37F)
1023 All operations allowed (0x3FF)
1024 Disables proxy warning dialog (0x400)
32768 R13 format proxy (0x8000)
======= =========================
.. attribute:: dxf.instance_count
Instance count for a custom class.
.. attribute:: dxf.was_a_proxy
Set to ``1`` if class was not loaded when this DXF file was created, and ``0`` otherwise.
.. attribute:: dxf.is_an_entity
Set to ``1`` if class was derived from the :class:`DXFGraphic` class and can reside in layouts.
If ``0``, instances may appear only in the OBJECTS section.
.. attribute:: key
Unique name as ``(name, cpp_class_name)`` tuple.
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