Game in JavaFX: Two classes to create games using JavaFX

Game.java

package org.jugvale.javafx;

import javafx.scene.canvas.GraphicsContext;

/**
 *
 * @author william
 */
public abstract class Game {

    /*
        The GraphicsContext so the game can draw stuff
    */
    GraphicsContext gc;

    GameEngine engine;

    /*
     The size of the game playing area 
     */
    float MAX_W;
    float MAX_H;

    public Game(float w, float h, GraphicsContext _gc) {
        MAX_W = w;
        MAX_H = h;
        gc = _gc;
        gc.getCanvas().setWidth(w);
        gc.getCanvas().setHeight(h);
    }

    final public void setEngine(GameEngine _engine) {
        engine = _engine;
    }

    public abstract void update();

    public abstract void display();

}

GameEngine.java

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package org.jugvale.javafx;

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.event.Event;
import javafx.util.Duration;

/**
 *
 * @author william
 */
public class GameEngine {

    private int frameCount = 0;
    private int frameRate;
    private final Game game;
    private final Timeline gameLoop;

    public GameEngine(int frameRate, Game game) {
        this.frameRate = frameRate;
        this.game = game;
        game.setEngine(this);
        gameLoop = createLoop();
    }

    public int getFrameCount() {
        return frameCount;
    }

    public int getFrameRate() {
        return frameRate;
    }

    public void setFrameRate(int frameRate) {
        this.frameRate = frameRate;
    }

    private void run(Event e) {
      frameCount++;
        game.update();
        game.display();
    }

    public void start() {
        gameLoop.playFromStart();
    }

    public void stop() {
        gameLoop.stop();
    }

    private Timeline createLoop() {
        // inspired on https://carlfx.wordpress.com/2012/04/09/javafx-2-gametutorial-part-2/
        final Duration d = Duration.millis(1000 / frameRate);
        final KeyFrame oneFrame = new KeyFrame(d, this::run);
        Timeline t = new Timeline(frameRate, oneFrame);
        t.setCycleCount(Animation.INDEFINITE);
        return t;
    }
    
}