FunctionPlotter.java

class Graphics2DPlotter {
    final SVGGraphics2D g2d = new SVGGraphics2D(...);
    byte[] plotAsSVG(String function, double xmin, double xmax) {
        ... /* Use g2d instance for rendering. */
    }
}

class PlotterSingletonFeature implements Feature {
    @Override
    public void afterRegistration(AfterRegistrationAccess access) {
        /* This code runs during image generation. */
        ImageSingletons.add(Graphics2DPlotter.class, new Graphics2DPlotter());
    }
}

/* At run time, look up the singleton object that was created during image generation. */
ImageSingletons.lookup(Graphics2DPlotter.class).plotAsSVG(function, xmin, xmax);