Feature/custom font

[skch-17]

@schoero Morning
As we currently have the requirement to create PDF/A-2b, we need to adjust the font for the QR-Bill so that we are able to embed it into the pdf. As 'Helvetica' is a .afm font in PDFKit it is not embeddable. That's why we use now Liberation-Sans as it is compatible with the Swiss-QR-Standards and free of charge.

I opened a pull request so that you see the changes I made. As my fork is in quite strange state, so that we can work you probably must decline the pull or remove the change to the addPath.

[schoero]

Thank you for the contribution. I have released you changes with SwissQRBill v4.0.0.

Keep in mind, that the font has to be registered before using. You can now change the font like this:

const data = {
  amount: 1994.75,
  creditor: {
    account: "CH44 3199 9123 0008 8901 2",
    address: "Musterstrasse",
    buildingNumber: 7,
    city: "Musterstadt",
    country: "CH",
    name: "SwissQRBill",
    zip: 1234
  },
  currency: "CHF",
  debtor: {
    address: "Musterstrasse",
    buildingNumber: 1,
    city: "Musterstadt",
    country: "CH",
    name: "Peter Muster",
    zip: 1234
  },
  reference: "21 00000 00003 13947 14300 09017"
};

const stream = createWriteStream("different-font.pdf");

const pdf = new PDFDocument({ autoFirstPage: false });

// Register the font
pdf.registerFont("Liberation-Sans", "path/to/LiberationSans-Regular.ttf");
pdf.registerFont("Liberation-Sans-Bold", "path/to/LiberationSans-Bold.ttf");

const qrBill = new SwissQRBill(data, { fontName: "Liberation-Sans" });

qrBill.attachTo(pdf);

pdf.pipe(stream);
pdf.end();