package demo;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.Pane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.CycleMethod;
import javafx.scene.paint.LinearGradient;
import javafx.scene.paint.Stop;
import javafx.stage.Stage;

public class BugStroke extends Application {
     private static final int DEFAULT_RADIUS = 40;
    public static void main(String[] args) {
        launch(args);
    }
        Group root = new Group();

    private void init(Stage primaryStage) {
        primaryStage.setScene(new Scene(root));
        primaryStage.setHeight(250);
    }

    @Override public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
        root.getChildren().add(drawNode());
    }
    
    Pane borderPane;  
   protected Pane baseFill(Pane pane) {
            pane.setPrefSize(180, 190);
            pane.setStyle("-fx-border-color: darkgray;");
            return pane;
        }    
       public Node drawNode() {
            borderPane = baseFill(new VBox());

       
final Canvas canvas = new Canvas(120, 120);
            GraphicsContext _gc = canvas.getGraphicsContext2D();
        
                 setEffect(_gc);
                 _gc.strokeOval(DEFAULT_RADIUS / 2, DEFAULT_RADIUS / 2, 2 * DEFAULT_RADIUS, DEFAULT_RADIUS);
             //   setEffect(_gc);

            borderPane.getChildren().addAll(canvas);
            

            return borderPane;
        }
       
void setEffect(GraphicsContext gc) {
                gc.setStroke(new LinearGradient(0, 0, 1, 4, true, CycleMethod.NO_CYCLE, new Stop[]{new Stop(0, Color.RED), new Stop(0.3f, Color.BLUE)}));
                gc.setLineWidth(18f);  
                gc.stroke();
            //    gc.fill();
            }       
    }