Chinese garbled characters appear in the exported PDF

[sunblog3]

There is a need to load the font, the result does not work

import os
import ezdxf
from ezdxf import recover
from ezdxf.addons.drawing import Frontend
from ezdxf.addons.drawing.matplotlib import MatplotlibBackend
from ezdxf.addons.drawing.properties import LayoutProperties, RenderContext
from matplotlib import pyplot as plt
from matplotlib.font_manager import FontProperties


def save_svg_pdf(dxf_name):
    """
    :param dxf_name: The dxf file path  to convert
    :return:
    """
    new_name = os.path.basename(dxf_name).split('.')[0] + '.pdf'
    try:
        doc, auditor = recover.readfile(dxf_name)
    except IOError:
        return 'Not a DXF file or a generic I/O error.'
    except ezdxf.DXFStructureError:
        return 'Invalid or corrupted DXF file.'

    if not auditor.has_errors:
        #  Create the Matplotlib graphics object
        fig = plt.figure()

        # Load modelspace
        msp = doc.modelspace()

        # Set the layout properties of the Matplotlib graph
        layout_prperties = LayoutProperties.from_layout(msp)
        layout_prperties.set_colors(bg='#FFFFFF')

        # Specify the font file using the full path
        font_path = r'C:\Windows\Fonts\simsun.ttc'
        font_prop = FontProperties(fname=font_path)
        plt.rcParams["font.sans-serif"] = font_prop.get_family()
        # plt.rcParams["font.sans-serif"] = font_manager.FontProperties(fname=font_path)

        ax = fig.add_axes([0, 0, 1, 1])
        ctx = RenderContext(doc)
        ctx.set_current_layout(msp)
        out = MatplotlibBackend(ax)
        Frontend(ctx, out).draw_layout(msp, finalize=True, layout_properties=layout_prperties)

        # Save to PDF
        fig.savefig(new_name, dpi=800)
        # Display (option)
        plt.show()
    return 'Successfully converted DXF to SVG and PDF.'

if __name__ == '__main__':
    dxf_path = "test.dxf"
    print(save_svg_pdf(dxf_path))

demo.zip

[mozman]

This cannot work with ezdxf. The DXF file uses the regular arial.ttf font to display Chinese characters which are not included in the this font.

CAD applications use a replacement font internally to display such undefined characters, ezdxf doesn't do this.

It works when you replace arial.ttf by arialuni.ttf the version with broad Unicode support:

[sunblog3]

Ok, one more question is how to load multiple third-party fonts (undefined characters) or standard fonts

[mozman]

https://ezdxf.mozman.at/docs/tools/fonts.html