Drawing vector images on PDF with PDFBox

Question

I would like to draw a vector image on a PDF with Apache PDFBox.

This is the code I use to draw regular images

PDPage page = (PDPage) document.getDocumen         


        

Answer 1

See the library pdfbox-graphics2d, touted in this Jira.

You can draw the SVG, via Batik or Salamander or whatever, onto the class PdfBoxGraphics2D, which is parallel to iText's template.createGraphics(). See the GitHub page for samples.

PDDocument document = ...;
PDPage page = ...; // page whereon to draw

String svgXML = "";
double leftX = ...;
double bottomY = ...; // PDFBox coordinates are oriented bottom-up!

// I set these to the SVG size, which I calculated via Salamander.
// Maybe it doesn't matter, as long as the SVG fits on the graphic.
float graphicsWidth = ...;
float graphicsHeight = ...;

// Draw the SVG onto temporary graphics.
var graphics = new PdfBoxGraphics2D(document, graphicsWidth, graphicsHeight);
try {
    int x = 0;
    int y = 0;
    drawSVG(svg, graphics, x, y); // with Batik, Salamander, or whatever you like
} finally {
    graphics.dispose();
}

// Graphics are not visible till a PDFormXObject is added.
var xform = graphics.getXFormObject();

try (var contentWriter = new PDPageContentStream(document, page, AppendMode.APPEND, false)) { // false = don't compress
    // XForm objects have to be placed via transform,
    // since they cannot be placed via coordinates like images.
    var transform = AffineTransform.getTranslateInstance(leftX, bottomY);
    xform.setMatrix(transform);

    // Now the graphics become visible.
    contentWriter.drawForm(xform);
}

And ... in case you want also to scale the SVG graphics to 25% size:

// Way 1: Scale the SVG beforehand
svgXML = String.format("", .25, svgXML);

// Way 2: Scale in the transform (before calling xform.setMatrix())
transform.concatenate(AffineTransform.getScaleInstance(.25, .25));