1 files changed, 129 insertions, 0 deletions
diff --git a/io_import_dxf/dxfimport/is_.py b/io_import_dxf/dxfimport/is_.py
new file mode 100644
index 00000000..38928aa0
--- /dev/null
+++ b/io_import_dxf/dxfimport/is_.py
@@ -0,0 +1,129 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program 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 2
+#  of the License, or (at your option) any later version.
+#
+#  This program 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 this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+
+_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
+
+
+_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__"):
+            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