How to get radius of a Circle Shape after I scaled it [JavaFX] - javafx-8

Question

I'm trying to get the radius of a Circle Shape after I scaled it. I don't know how to do it. I'm developing a software (with javaFX library) that will let the user add Shapes (Circle, Rectangle, Squares,...)to a Panel, simply "modify" them, save the drawing and load it. I'm managing the saving/loading stuff by cycling through the Nodes the user added (there's a button to create Circle, Rectangle, ... and add it to the Panel), taking the properties I need to load them (centerX, centerY, scaleX, scaleY, ...) and, when button "save" pressed, to save them in a txt file. (stil working on loading, but my thought was to read the previous txt file and cycle it to re-create Shapes on panel in the same position, scale, rotation.)
Here's the code I wrote this is the portion of code that create circle:
public Circle createCircle(double x, double y, double r, Color color) {
Circle circle = new Circle(x, y, r, color);
circle.setCursor(Cursor.HAND);
circle.setOnMousePressed((t) -> {
orgSceneX = t.getSceneX();
orgSceneY = t.getSceneY();
Circle c = (Circle) (t.getSource());
c.toFront();
});
circle.setOnMouseDragged((t) -> {
double offsetX = t.getSceneX() - orgSceneX;
double offsetY = t.getSceneY() - orgSceneY;
Circle c = (Circle) (t.getSource());
c.setCenterX(c.getCenterX() + offsetX);
c.setCenterY(c.getCenterY() + offsetY);
orgSceneX = t.getSceneX();
orgSceneY = t.getSceneY();
});
return circle;
}
Here's the code i use to scale it:
public void addMouseScrolling(Node node) {
node.setOnScroll((ScrollEvent event) -> {
// Adjust the zoom factor as per your requirement
double zoomFactor = 1.05;
double deltaY = event.getDeltaY();
if (deltaY < 0){
zoomFactor = 2.0 - zoomFactor;
}
node.setScaleX(node.getScaleX() * zoomFactor);
node.setScaleY(node.getScaleY() * zoomFactor);
});
}
And this is the code of the save button:
Button btn2 = new Button("Save");
btn2.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent event) {
int i=0;
for (Node node: root.getChildren()) i++;
String stringa_salvataggio[] = new String[i];
String stringa="";
i=0;
String scal_X_s, scal_Y_s, Lyt_X_s, Lyt_Y_s, width_s, height_s;
for (Node node: root.getChildren()){
String stringa_nodo = node.toString();
Double scal_X = node.getScaleX();
scal_X_s = Double.toString(scal_X);
Double scal_Y = node.getScaleY();
scal_Y_s = Double.toString(scal_X);
Double Lyt_X = node.getLayoutX();
Lyt_X_s = Double.toString(scal_X);
Double Lyt_Y = node.getLayoutY();
Lyt_Y_s = Double.toString(scal_X);
Double width = node.getLayoutBounds().getWidth();
width_s = Double.toString(scal_X);
Double height = node.getLayoutBounds().getHeight();
height_s = Double.toString(scal_X);
stringa = stringa + scal_X_s + scal_Y_s + "\n";
stringa_salvataggio[i] = stringa;
System.out.println("-------");
i++;
System.out.println("Nodo " + i + ":");
System.out.println("scalX:" + scal_X);
System.out.println("scalY:" + scal_Y);
System.out.println("LayoutX:" + Lyt_X);
System.out.println("LayoutY:" + Lyt_Y);
System.out.println("Width:" + width);
System.out.println("Height:" + height);
System.out.println(stringa_nodo);
//save on .txt
}
System.out.println(stringa_salvataggio);
}
});
As I said before, I don't know how to get the radius of Circle to recreate it on loading. Rectangles and squares aren't a problem, I can take all infos I need.
Thanks in advance.