PVector.java

import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.scene.shape.Circle;

/**
 *
 * @author sedri
 */
public class PVector{

    DoubleProperty xDoubleProperty = new SimpleDoubleProperty();
    DoubleProperty yDoubleProperty = new SimpleDoubleProperty();
    
    public PVector() {
        
    }
    
    public PVector(double x, double y)
    {
        xDoubleProperty.setValue(x);
        yDoubleProperty.setValue(y);
    }
    
    public void add(PVector pVector)
    {
        xDoubleProperty.setValue(xDoubleProperty.getValue() + pVector.xDoubleProperty.getValue());
        yDoubleProperty.setValue(yDoubleProperty.getValue() + pVector.yDoubleProperty.getValue());
    }
    
    public void subtract(PVector pVector)
    {
        xDoubleProperty.setValue(xDoubleProperty.getValue() - pVector.xDoubleProperty.getValue());
        yDoubleProperty.setValue(yDoubleProperty.getValue() - pVector.yDoubleProperty.getValue());
    }
    
    public void mult(double scalar)
    {
        xDoubleProperty.setValue(xDoubleProperty.getValue() * scalar);
        yDoubleProperty.setValue(yDoubleProperty.getValue() * scalar);
    }
    
    public void div(double scalar)
    {
        xDoubleProperty.setValue(xDoubleProperty.getValue() / scalar);
        yDoubleProperty.setValue(yDoubleProperty.getValue() / scalar);
    }
    
    public double calMag()
    {
        double x = xDoubleProperty.getValue();
        double y = yDoubleProperty.getValue();
        
        return Math.sqrt((x * x) + (y * y));
    }
    
    public void normalize()
    {
        double mag = calMag();
        if(mag != 0)
        {
            div(mag);
        }
    }

    @Override
    public String toString() {
        return "PVector{" + "xDoubleProperty=" + xDoubleProperty + ", yDoubleProperty=" + yDoubleProperty + '}';
    }
    
    
}

PVectorExample.java

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 *
 * @author sedri
 */
public class PVectorExample extends Application {
    Timeline timeline;
    
    @Override
    public void start(Stage primaryStage) {
        PVector location = new PVector(300, 250);
        PVector velocity = new PVector(5, 0);
        PVector acceleration = new PVector(1, 0);
        
        Circle circle = new Circle(25, Color.BLUE);
        circle.centerXProperty().bind(location.xDoubleProperty);
        circle.centerYProperty().bind(location.yDoubleProperty);
        
       timeline = new Timeline(new KeyFrame(Duration.seconds(.04), (event) -> {
           velocity.add(acceleration);
           location.add(velocity);
           System.out.println(velocity);
       }));
       timeline.setCycleCount(Timeline.INDEFINITE);
        Button btnStart = new Button();
        btnStart.setText("Start");
        btnStart.setOnAction((ActionEvent event) -> {
            timeline.play();
        });
        
        Pane board = new Pane(circle);
        board.setPrefSize(600, 500);
        board.setMaxSize(600, 500);
        board.setStyle("-fx-background-color: white;");
        VBox root = new VBox(new StackPane(board), btnStart);
        root.setStyle("-fx-background-color: yellow;");
        root.setAlignment(Pos.CENTER);
        Scene scene = new Scene(root, 700, 700);
        
        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
    
}