java - JavaFX Canvas - how to repaint a canvas after painting? -


i wrote code possible paint on javafx canvas. works fine don't know how repaint (like in swing) canvas start again painting on new canvas. here code , lot help! mario

public class main extends application {    private static final int width = 600;   private static final int heigth = 400;    @override   public void start(stage primarystage) {     //handling canvas     final canvas canvas = new canvas(width, heigth);     final graphicscontext gc = canvas.getgraphicscontext2d();     gc.setfill(color.aqua);     gc.fill();     //painting mousedragged event      canvas.setonmousedragged(event -> gc.filloval(event.getx(),   event.gety(), 25, 25));     //user colorpicke color of painting     colorpicker cp = new colorpicker();     cp.setonaction(e -> gc.setfill(cp.getvalue()));     //layout     borderpane root = new borderpane();     hbox hb = new hbox(30);     button button = new button("clear all");      button.setonaction(e ->     /*how repaint canvas*/     system.out.println("how repaint???"));      hb.getchildren().addall(cp, button);     hb.setprefheight(200);     hb.setalignment(pos.center);     root.setcenter(canvas);     root.setbottom(hb);     final scene scene = new scene(root);     primarystage.settitle("hello world!");     primarystage.setscene(scene);     primarystage.show();   }    public static void main(string[] args) {     launch(args);   } } 

by clearing canvas :

button.setonaction(e ->     gc.clearrect(0, 0, canvas.getwidth(), canvas.getheight())); 

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