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# SPDX-License-Identifier: GPL-2.0-or-later
from mathutils import Vector
_MESH_ENTITIES = frozenset(["POLYFACE", "POLYMESH", "MESH", "POINT", "3DFACE", "SOLID", "TRACE"])
def mesh_entity(entity):
return entity.dxftype in _MESH_ENTITIES
def mesh(typestr):
return typestr in _MESH_ENTITIES
_POLYS = frozenset(["LWPOLYLINE", "POLYLINE"])
def closed_poly_no_bulge(entity):
return entity.dxftype in _POLYS and not any([b != 0 for b in entity.bulge]) and entity.is_closed
_CURVE_ENTITIES = frozenset(("POLYLINE", "POLYGON", "LWPOLYLINE", "SPLINE",
"CIRCLE", "ARC", "ELLIPSE", "LINE", "HELIX"))
def curve_entity(entity):
return entity.dxftype in _CURVE_ENTITIES
def curve(typestr):
return typestr in _CURVE_ENTITIES
_NURBS_ENTITIES = frozenset(("BODY", "REGION", "PLANESURFACE", "SURFACE", "3DSOLID"))
def nurbs_entity(entity):
return entity.dxftype in _NURBS_ENTITIES
def nurbs(typestr):
return typestr in _NURBS_ENTITIES
_TEXT_ENTITIES = frozenset(("MTEXT", "TEXT"))
def text_entity(entity):
return entity.dxftype in _TEXT_ENTITIES
def text(typestr):
return typestr in _TEXT_ENTITIES
def insert_entity(entity):
return entity.dxftype == "INSERT"
def insert(typestr):
return typestr == "INSERT"
def light_entity(entity):
return entity.dxftype == "LIGHT"
def light(typestr):
return typestr == "LIGHT"
def attrib(entity):
return entity.dxftype == "ATTDEF"
def attrib(typestr):
return typestr == "ATTDEF"
_2D_ENTITIES = frozenset(("CIRCLE", "ARC", "SOLID", "TRACE", "TEXT", "ATTRIB", "ATTDEF", "SHAPE",
"INSERT", "LWPOLYLINE", "HATCH", "IMAGE", "ELLIPSE"))
def _2D_entity(entity):
return entity.dxftype in _2D_ENTITIES or (entity.dxftype == "POLYGON" and entity.mode == "spline2d")
def varying_width(entity):
if hasattr(entity, "width"):
ew = entity.width
if hasattr(ew, "__iter__"):
if len(ew) == 0:
return False
else:
return ew.count(ew[0]) != len(ew) or ew[0][0] != ew[0][1]
return False
_SEPERATED_ENTITIES = frozenset(("POLYFACE", "POLYMESH", "LIGHT", "MTEXT", "TEXT", "INSERT", "BLOCK"))
def separated_entity(entity):
"""
Indicates if the entity should be imported to one single Blender object or if it can be merged with other entities.
This depends not only on the type of a dxf-entity but also whether the width values are varying or all the same.
"""
return entity.dxftype in _SEPERATED_ENTITIES or varying_width(entity)
def separated(typestr):
return typestr in _SEPERATED_ENTITIES
_NOT_COMBINED_ENTITIES = frozenset(tuple(_SEPERATED_ENTITIES) + ("ATTDEF",))
def combined_entity(entity):
return not separated_entity(entity) and not entity.dxftype == "ATTDEF"
def combined(typestr):
return typestr not in _NOT_COMBINED_ENTITIES
def extrusion(entity):
if entity.extrusion is None:
return False
return Vector(entity.extrusion) != Vector((0, 0, 1)) \
or (hasattr(entity, "elevation") and entity.elevation != 0)
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