src/main/java/org/jfree/graphics2d/svg/SVGGraphics2D.java
@Override
    public void transform(AffineTransform t) {
        AffineTransform tx = getTransform();
        tx.concatenate(t);
        setTransform(tx);
    }
@Override
    public void transform(AffineTransform t) {
        AffineTransform tx = getTransform();
        tx.concatenate(t);
        setTransform(tx);
    }
Applies this transform to the existing transform by concatenating it.

@param t  the transform ({@code null} not permitted).