Java SE (Java Platform, Standard Edition)

I found this SVG to FXML converter SVG To FXML Converter as Commandline util | Tomsondev Blog which works really well.

In my code I have:

@FXML
private Button demobutton;

FXMLLoader loader = new FXMLLoader(getClass().getResource("tiger.fxml"));
Parent root = (Parent) loader.load();

Then I'd like to set the image in the button, something like

demobutton.setGraphic(root);
demobutton.setContentDisplay(ContentDisplay.GRAPHIC_ONLY);

If I do this, the button is sized the same as the size of the image, which is fine if that's what you want, but what I'd really like to do is scale the image so it fits the default layout size of the button. Simply scaling the image makes the image smaller, but the button is still sized the same as the original image. The only way I've found to make it work is:

double xx = root.getBoundsInLocal().getWidth();
double yy = root.getBoundsInLocal().getHeight();

final Button button = new Button("Some Text");
final Scene snapScene = new Scene(button);
snapScene.snapshot(null);
double w = button.getWidth();
double h = button.getHeight();
root.setScaleX((h-4.0) / xx);
root.setScaleY((h-4.0) / yy);

demobutton.setMaxHeight(h);
demobutton.setMaxWidth(w);
demobutton.setMinHeight(h);
demobutton.setMinWidth(w);
demobutton.setPrefWidth(w);
demobutton.setPrefHeight(h);
demobutton.setGraphic(root);
demobutton.setContentDisplay(ContentDisplay.GRAPHIC_ONLY);

which seems a very horrible way to do it. Is there a better means to do this ?