dxf2png get white background

[Wananrd]

I am a AI student. I am not good at CAD. My project needs to use dxf to png.

I following the document learned how to transform, it succeed in 99.99% .dxf files, but some of them failed.

Please help me find where is problems and how to solve it.

Here is my dxf img and code.
address_dxf.zip

import ezdxf
from ezdxf.addons.drawing import Frontend, RenderContext, pymupdf, layout, config
import os

def dxf2png(file_name, save_folder):
    if file_name.endswith(".dxf"):
        try:
            doc = ezdxf.readfile(filename=file_name)
            # 这里是你的其他处理代码
            msp = doc.modelspace()
            # 1. create the render context
            context = RenderContext(doc)
            # 2. create the backend
            backend = pymupdf.PyMuPdfBackend()
            # 3. create and configure the frontend
            cfg = config.Configuration(background_policy=config.BackgroundPolicy.WHITE)
            frontend = Frontend(context, backend, config=cfg)
            # 4. draw the modelspace
            frontend.draw_layout(msp)
            # 5. create an A4 page layout
            page = layout.Page(891, 891, layout.Units.mm, margins=layout.Margins.all(20))
            # 6. get the PDF rendering as bytes
            png_bytes = backend.get_pixmap_bytes(page, fmt="png", dpi=96)
            # 7. save png
            save_name = file_name.split("\\")[-1].split(".dxf")[0] + ".png"
            save_file = os.path.join(save_folder, save_name)
            with open(save_file, "wb") as fp:
                fp.write(png_bytes)

        except ezdxf.lldxf.const.DXFStructureError as e:
            print("捕获到DXFStructureError异常:", e)
            # 这里是处理异常的代码

if __name__ == "__main__":
    # 单独文件处理
    dxf_file = "3B7P-L12100-1.dxf"
    save_folder = "./result"
    dxf2png(dxf_file, save_folder)`

[mozman]

This is partly a bug in ezdxf v1.2.0 which is already fixed. The color_policy is set to ColorPolicy.BLACK for this PNG to see yellow on white background.

These four objects are REGION entities based on ACIS and rendering ACIS entities is not supported by ezdxf.

[Wananrd]

Thanks for your answer and your work.

Sorry my question is unclearly. If I want to show the white line in my .png, you called REGIN entities. How could I implement it?

Is there some ways? such as change CAD and edit some module.

[mozman]

The EXPLODE command in CAD applications converts REGION entities into basic DXF entities:

[Wananrd]

Thank you very much!!!