jsPDF justify text

Question

I'm trying to apply some changes on jsPDF library to be able to justify text.

I'm having trouble to find the right value for Tw (word spacing).

In jspdf.js (L:1413) I have added this code:

if (align) {
    ...                
    else if (align === 'justify') {
       left = x;
    }
    else {
        throw new Error('Unrecognized alignment option, use "center" or "right".');
    }
    prevX = x;
    text = '(' + da[0];

    let pdfPageWidth = this.internal.pageSize.width;
    let wordSpacing;
    if( align === 'justify' ) {
        let fontSize = this.internal.getFontSize();
        let nWords = da[0].trim().split(/\s+/).length;
        let textWidth = this.getStringUnitWidth(da[0].replace(/\s+/g, '')) / this.internal.scaleFactor;
        wordSpacing = (Math.max(0, (pdfPageWidth - textWidth) / Math.max(1, nWords - 1));
        wordSpacing += ' Tw\n';
        text = wordSpacing + text;
    }
    ...
}

The idea was to extract the space width by doing (pageWidth - textWidth) / numberOfWords -1. I can't get the correct word space.

Output example

BT
/F1 16 Tf
18.4 TL
0 g
28.35 756.85 Td
19.00357142857142 Tw
(And a little bit it adélkfjalké.) Tj
ET

Is there an encoding problem?

Thanks for your help.

Answer 1

I answered you on github I wrote my own justification code into my refactored jsPDF according to your suggestion.

Check it out...

https://github.com/MrRio/jsPDF/issues/1016#issuecomment-329957940

Edited:

Oh wait, I can probably help with a direct answer. I think you just have to change it like this:

var wordSpacing = (Math.max(0, (pdfPageWidth - textWidth) / Math.max(1, nWords - 1)) * this.internal.scaleFactor);

if (align) {
    ...                
    else if (align === 'justify') {
        var wordSpacingPerLine = [];
        for (var i = 0, len = da.length; i < len; i++) {
            wordSpacingPerLine.push(((this.internal.pageSize.width - lineWidths[i]) / (da[i].split(" ").length - 1) * k).toFixed(2));
        }
    }
    else {
        throw new Error('Unrecognized alignment option, use "center" or "right".');
    }
    prevX = x;
    text = '(' + da[0];

    let pdfPageWidth = this.internal.pageSize.width;
    let wordSpacing;
    if( align === 'justify' ) {
        text =  wordSpacingPerLine[0]  + ' Tw\n' + text;
    }
    ...
}

You have to do add the specific WordSpacing for every line except the last line. Last line is then left aligned.

Here an example:

BT
/F1 16 Tf
18.4 TL
0 g
4.869500000212597 Tw
28.35 813.54 Td
(Lorem ipsum dolor sit amet, consetetur abore et dolore) Tj
3.5284444446334158 Tw
0.00 -18.40 Td
(magna aliquyam erat, sed diam voluptua. At vero eos et) Tj
2.0876000001700574 Tw
0.00 -18.40 Td
(accusam et justo duo dolores et ea rebum. Stet clita kasd) Tj
1.329500000212585 Tw
0.00 -18.40 Td
(gubergren, no sea takimata sanctus est Lorem ipsum dolor) Tj
1.329500000212585 Tw
0.00 -18.40 Td
(sit amet.) Tj
ET