how to update view in Group in javaFX? -


i have graph this. want update view when change slider. however, elements stacked that when change slider. can new view.

my app's structrue:

circle , quadcurve -> group -> scrollpane -> borderpane -> scene -> stage

this app demonstrates trying achieve. comments in code.

main

import javafx.application.application; import javafx.fxml.fxmlloader; import javafx.scene.parent; import javafx.scene.scene; import javafx.stage.stage;  /**  *  * @author blj0011  */ public class javafxapplication6 extends application {      @override     public void start(stage stage) throws exception {         parent root = fxmlloader.load(getclass().getresource("fxmldocument.fxml"));          scene scene = new scene(root);          stage.setscene(scene);         stage.show();     }      /**      * @param args command line arguments      */     public static void main(string[] args) {         launch(args);     }     }

controller

import java.net.url; import java.util.resourcebundle; import javafx.event.actionevent; import javafx.fxml.fxml; import javafx.fxml.initializable; import javafx.scene.group; import javafx.scene.control.slider; import javafx.scene.paint.color; import javafx.scene.shape.circle;  /**  *  * @author blj0011  */ public class fxmldocumentcontroller implements initializable {      @fxml     private group groupmain;      @fxml     private circle cirmain, circenter, cirradius1, cirradius2, cirradius3;      @fxml     private slider slidermain;      @override     public void initialize(url url, resourcebundle rb) {         // todo        }          @fxml void handlebutton(actionevent event)     {         double radius = cirmain.getradius();//get transparent maincircle radius             system.out.println(radius + " : " +  cirmain.getlayoutx() + " : " +  cirmain.getlayouty());          cirradius1.setradius(20);         cirradius1.setlayoutx(radius * math.cos(50) + cirmain.getlayoutx());//set cirradius1 x location on circumference of cirmain         cirradius1.setlayouty(radius * math.sin(50) + cirmain.getlayouty());//set cirradius1 y location on circumference of cirmain         cirradius1.setfill(color.red);          cirradius2.setradius(10);         cirradius2.setlayoutx(radius * math.cos(175) + cirmain.getlayoutx());//set cirradius2 x location on circumference of cirmain         cirradius2.setlayouty(radius * math.sin(175) + cirmain.getlayouty());//set cirradius2 y location on circumference of cirmain         cirradius2.setfill(color.yellow);          cirradius3.setradius(15);         cirradius3.setlayoutx(radius * math.cos(300) + cirmain.getlayoutx());//set cirradius3 x location on circumference of cirmain         cirradius3.setlayouty(radius * math.sin(300) + cirmain.getlayouty());//set cirradius3 y location on circumference of cirmain         cirradius3.setfill(color.green);          slidermain.setvalue(radius);//set slider value current cirmain radius           //this listener moves circle inward or outward depending on slider. changes radius of cirmain's radius         slidermain.valueproperty().addlistener((obs, oldval, newval)->{             cirmain.setradius(newval.doublevalue());             cirradius1.setlayoutx(newval.doublevalue() * math.cos(50) + cirmain.getlayoutx());             cirradius1.setlayouty(newval.doublevalue() * math.sin(50) + cirmain.getlayouty());              cirradius2.setlayoutx(newval.doublevalue() * math.cos(175) + cirmain.getlayoutx());             cirradius2.setlayouty(newval.doublevalue() * math.sin(175) + cirmain.getlayouty());              cirradius3.setlayoutx(newval.doublevalue() * math.cos(300) + cirmain.getlayoutx());             cirradius3.setlayouty(newval.doublevalue() * math.sin(300) + cirmain.getlayouty());         });      } }

fxml

<?xml version="1.0" encoding="utf-8"?>  <?import javafx.scene.control.button?> <?import javafx.scene.control.slider?> <?import javafx.scene.layout.anchorpane?> <?import javafx.scene.shape.circle?>   <anchorpane maxheight="-infinity" maxwidth="-infinity" minheight="-infinity" minwidth="-infinity" prefheight="518.0" prefwidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="javafxapplication6.fxmldocumentcontroller">    <children>       <circle fx:id="cirmain" fill="#ededed00" layoutx="300.0" layouty="200.0" radius="175.0" stroke="black" stroketype="inside" />       <circle fx:id="circenter" fill="dodgerblue" layoutx="300.0" layouty="200.0" radius="14.0" stroke="black" stroketype="inside" />       <circle fx:id="cirradius1" fill="dodgerblue" layoutx="177.0" layouty="156.0" radius="25.0" stroke="black" stroketype="inside" />       <circle fx:id="cirradius2" fill="dodgerblue" layoutx="412.0" layouty="166.0" radius="35.0" stroke="black" stroketype="inside" />       <circle fx:id="cirradius3" fill="dodgerblue" layoutx="237.0" layouty="290.0" radius="27.0" stroke="black" stroketype="inside" />       <button layoutx="288.0" layouty="479.0" mnemonicparsing="false" onaction="#handlebutton" text="button" />       <slider fx:id="slidermain" blockincrement="1.0" layoutx="34.0" layouty="418.0" max="200.0" prefheight="38.0" prefwidth="551.0" showticklabels="true" showtickmarks="true" />    </children> </anchorpane>

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