Know the scale when converting from DXF to png

[Jonvu27]

Hello, thank you for this great library.
I have a question about scaling when converting a DXF file to PNG. I am using the code below to convert my DXF files:

class DXF2IMG(object):
            
    default_img_format = '.png'
    default_img_res = 300
    def convert_dxf2img(self, names, img_format=default_img_format, img_res=default_img_res):
        for name in names:
            doc = ezdxf.readfile(name)
            msp = doc.modelspace()
           
            # Recommended: audit & repair DXF document before rendering
            auditor = doc.audit()
            # The auditor.errors attribute stores severe errors,
            # which *may* raise exceptions when rendering.
            if len(auditor.errors) != 0:
                raise exception("The DXF document is damaged and can't be converted!")
            else :
                fig = plt.figure()
                ax = fig.add_axes([0, 0, 1, 1])
                ctx = RenderContext(doc)
                ctx.set_current_layout(msp)
                #ctx.current_layout.set_colors(bg='#FFFFFF')
                out = MatplotlibBackend(ax)
                Frontend(ctx, out).draw_layout(msp, finalize=True)

                img_name = re.findall("(\S+)\.",name)  # select the image name that is the same as the dxf file name
                first_param = ''.join(img_name) + img_format  #concatenate list and string
                fig.savefig(first_param, dpi=img_res)

And this code works correctly, but I understand that the drawing on the png is always at the largest size possible to fill the page. I would like to know if it is possible to know the scale of the image from DXF to png and know how to do it. I need it to compare different drawing.

Thank you for your answer.

[mbway]

sounds like you want to know the transformation matrix from the dxf (WCS) to the image. see the drawing addon FAQ: #550

[Jonvu27]

Thank you, that's what I was looking for.