Circle Animation

package CircleAnimation;

import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import static java.lang.Math.*;

/**
 *
 * @author Aamir khan
 *
 */
public class Main extends Application {

    private GraphicsContext g;
    double t = 0.0;
    private Stage stage;

    @Override
    public void start(Stage stage) throws Exception {
        this.stage = stage;
        stage.setTitle("Parametric Equation");
        this.stage.setScene(new Scene(createContent()));
        this.stage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }

    private Parent createContent() {
        Pane root = new Pane();
        root.setPrefSize(800, 600);
        Canvas canvas = new Canvas(800, 600);
        g = canvas.getGraphicsContext2D();

        AnimationTimer timer;
        timer = new AnimationTimer() {
            @Override
            public void handle(long now) {
                t += 0.017;
                draw();

            }

            private void draw() {
                Point2D p = curve();
                g.setStroke(Color.BLACK);
                double strokeSize = 1;
                double newX = 400 + p.getX();
                double newY = 300 + p.getY();
                g.strokeOval(newX, newY, strokeSize, strokeSize);
            }

            private Point2D curve() {
                return new Point2D(cos(t), sin(t)).multiply(50);
            }

        };
        timer.start();
        root.getChildren().add(canvas);
        return root;

    }
}