Underline y-position wrong for baseline "alphabetic"

[GeorgeP39]

Underline y-position wrong for baseline "alphabetic"

When setting the baseline to "alphabetic", underlines are drawn too far from the text

Code sample

// create a document and pipe to a blob
var doc = new PDFDocument();
var stream = doc.pipe(blobStream());

doc
  .font('Times-Roman', 13)
  .text(lorem, {
    width: 412,
    align: 'justify',
    indent: 30,
    columns: 2,
    height: 300,
    underline:true,
    baseline: "alphabetic"
  });

// end and display the document in the iframe to the right
doc.end();
stream.on('finish', function() {
  iframe.src = stream.toBlobURL('application/pdf');
});

Your environment

• pdfkit version: 0.10.0
• Node version: N/A
• Browser version (if applicable): N/A
• Operating System: Windows 10

[ditiem]

Is there any estimated time to fix this or is there anyway to help (as in any idea where start looking at or what can be the reason)?

[GeorgeP39]

I added a snippet to pdfkit_0,10.0.js which sorted it for my purposes (I'm not guaranteeing it for any other font, but it should get you started on a fix):

at around line 4016, there is

if (options.underline) {
  lineY -= lineWidth;
}

underneath that, I added

if(options.baseline && options.baseline === "alphabetic"){
	lineY -= ((this._font.ascender) / 1000) * this._fontSize;
}

Hope it helps!