Changing font functionality

[jkissl]

Looking through the documentation and the code in I found the font_path argument that either defaults to a supplied font or can be passed a path to a different font. I've tried several different variations of passing a font to it and even modified writer.py directly to use a different font. Neither of those had any effect on the font that appears below the barcode. Can you provide an example of changing the font?

[ghost]

I encountered this as well behavior as well. It only applies if you are writing SVGs though. If you write raster files (PNGs, JPGs, etc), the font_path option does exactly what you expect.

Looking at the SVGWriter class in class in barcode/writer.py it's pretty obvious why:

class SVGWriter(BaseWriter):
    # ...
    def _create_text(self, xpos, ypos):
        # ...
            attributes = {
                "x": SIZE.format(xpos),
                "y": SIZE.format(ypos),

                #
                # the 'font-family' attribute used by XHTML docs to render font is not set
                #
                "style": "fill:{};font-size:{}pt;text-anchor:middle;".format(
                    self.foreground,
                    self.font_size,
                ),
            }

As hacky workaround since in my use case I needed bunch of arbitrarily scalable barcodes with non-ambiguous font (a lot of fonts 0 and capitol O look identical), I just had it write the font_path option as the XHTML font-family option:

class SVGWriter(BaseWriter):
    # ...
    def _create_text(self, xpos, ypos):
        # ...
            attributes = {
                "x": SIZE.format(xpos),
                "y": SIZE.format(ypos),
                "style": "fill:{};font-size:{}pt;text-anchor:middle;font-family:'{}'".format(
                    self.foreground,
                    self.font_size,
                    self.font_path
                ),
            }

CAUTION: I am not clear on how that would interact with the SVG sizing system in the package so I didn't commit and PR this change. I wanted to take a closer look and do this more smartly if need be. Regardless, I am more than happy to work with the team on giving SVG barcodes font customizability.

[alexlopesbr]

As suggested by ghost the trick worked well. I would like to give a tip that the font_path actually means the font name."