import ezdxf
import math

DXFVERSION  = 'R2010'
NUMCORNERS = 5

def create_dxf():
    """ 五芒星のDXFファイルを生成
    """
    # 星の角座標計算
    startangle = math.pi / 2.0
    pitchangle = math.pi * 2.0 / 5.0

    # オフセットと半径
    offset_x, offset_y, radius = 100, 100, 10

    points = []
    for i in range(0, NUMCORNERS):
        angle = startangle + pitchangle * i
        if 2.0 * math.pi < angle:
            angle = angle - 2.0 * math.pi
        x = math.cos(angle) * radius + offset_x
        y = math.sin(angle) * radius + offset_y
        points.append((x, y))

    # DXFインスタンス生成
    dxf = ezdxf.new(DXFVERSION)
    modelspace = dxf.modelspace()

    # 五芒星描画
    last, i, count = -1, 0, 0
    while count < NUMCORNERS + 1:
        if 0 <= last:
            modelspace.add_line(points[i], points[last])
        last = i
        i += 2
        if NUMCORNERS <= i:
            i -= NUMCORNERS
        count += 1

    # DXFファイル出力
    dxf.saveas('/<出力先のパス>/star.dxf')

if __name__ == "__main__":
    create_dxf()

import ezdxf
from ezdxf import recover
from ezdxf.addons.drawing import matplotlib


def convert_dxf_to_png():
    try:
        dxf, auditor = recover.readfile('/<DXFファイルのパス>/star.dxf')
    except IOError as ioerror:
        print(ioerror)
        raise ioerror
    except ezdxf.DXFStructureError as dxf_structure_error:
        print(dxf_structure_error)
        raise dxf_structure_error

    if not auditor.has_errors:
        matplotlib.qsave(dxf.modelspace(), '/<出力先のパス>/star.png')

if __name__ == "__main__":
    convert_dxf_to_png()