DXFをpythonで読む

dxfgrabberを使うとpythonでDXFを読めるらしい
pip install dxfgrabber

フリーの2DCAD jw_cadで適当なDXFファイルを作っておいて，読んでみる．

dxf.py

import dxfgrabber

dxf = dxfgrabber.readfile("test.dxf")
# ヘッダ
print(dxf.header)
# {'$ACADVER': 'AC1009', '$DWGCODEPAGE': 'ANSI_1252', '$INSBASE': (0.0, 0.0, 0.0), '$EXTMIN': (0.0, 0.0), '$EXTMAX': (841.0, 594.0), '$LIMMIN': (0.0, 0.0), '$LIMMAX': (841.0, 594.0), '$LTSCALE': 1.0}

# 図形要素
# print(vars(dxf.entities))
cirs = [e for e in dxf.entities if e.dxftype == 'CIRCLE']
lines = [e for e in dxf.entities if e.dxftype == 'LINE']

# 円
print(vars(cirs[0]))
# {'dxftype': 'CIRCLE', 'handle': None, 'owner': None, 'paperspace': None, 'layer': '_0-0_', 'linetype': 'CONTINUOUS', 'thickness': 0.0, 'extrusion': (0.0, 0.0, 1.0), 'ltscale': 1.0, 'line_weight': 0, 'invisible': 0, 'color': 7, 'true_color': None, 'transparency': None, 'shadow_mode': None, 'layout_tab_name': None, 'center': (94.41901840490794, 356.85030674846627), 'radius': 16.151818630112004}
# centerが円中心のx, y
# radiusが円半径
# linetypeが線種

# 直線
print(vars(lines[0]))
# {'dxftype': 'LINE', 'handle': None, 'owner': None, 'paperspace': None, 'layer': '_0-0_', 'linetype': 'CONTINUOUS', 'thickness': 0.0, 'extrusion': None, 'ltscale': 1.0, 'line_weight': 0, 'invisible': 0, 'color': 7, 'true_color': None, 'transparency': None, 'shadow_mode': None, 'layout_tab_name': None, 'start': (386.4472392638037, 316.28711656441715), 'end': (386.4472392638037, 522.9865030674847)}
# startが始点x,y，endが終点x,y
# linetypeが線種

# 線種一覧(jw_cadの)
print(vars(dxf.linetypes))
# {'_table_entries': {'CONTINUOUS': <dxfgrabber.linetypes.Linetype object at 0x000002B43A5796A0>, 'DASHED1': <dxfgrabber.linetypes.Linetype object at 0x000002B43A5796D8>, 'DASHED2': <dxfgrabber.linetypes.Linetype object at 0x000002B43A579710>, 'DASHED3': <dxfgrabber.linetypes.Linetype object at 0x000002B43A579748>, 'CENTER1': <dxfgrabber.linetypes.Linetype object at ...

参考
https://qiita.com/ackermanrf128/items/d9275a7d077c1dff3ec7