Tile game loop problem

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  I am trying to understand works threading model of JavaFX, to determine the best way to write my game loops. This moment, my approach is this:

  EventHandler < ActionEvent > gameUpdate = event->

  {

  update of the world based on a timestep (see below) 33.3ms

  };

  gameLoop = new chronology (new KeyFrame (Duration.millis (33.3), gameUpdate));

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  My understanding is that:

  1. This should result in the game loop to run at around 30 FPS (the target frame rate), assuming that the gameUpdate does no more than 33.3ms.
  2. The changes I've made in the course of the gameUpdate causes a trigger pulse.
  3. This impulse is an event on the JavaFX application thread. Such an impulse ends a synchronization between the JavaFX application thread and a thread of rendering of the Prism.
  4. The gameUpdate runs on the same thread of request, so the pulse will run after the gameUpdate.
     By that I mean that the gameUpdate will never be interrupted by a pulse, which could cause the world to be returned in an intermediate state.
  5. Event handlers also run on the same thread, so I need not worry you synchronize them.
  6. Changes to the live nodes by event handlers will cause an additional impetus to be triggered.

  My questions are:

  1. I understand that correctly?
  2. When working with animations (for example. RotateTransition), this animation triggers its own pulses, actually being run to a framerate higher than the loop game?

  Thank you!

  > I tried AnimationTimer also, but that does not seem suited to the steps of fixed time...: 'the AnimationTimer class to create a timer, which is called in each frame, while it is active. This seems to indicate that the timer is called on each pulse...

  Yes, this is how the timer works, it is called on each pulse.  Generally, the pulse occurs regularly, 60 times per second.  However, if your code (or internal JavaFX code), a lot of work to do on a given pulse, for example you added 100 000 rectangles at the scene, then the impulse will have more than 1/60th of a second.  The AnimationTimer provides a hook you can hang off of to execute logic when occurs a pulse, but how many times it is called depends on the current frames per second (FPS), which the application is running under (which can vary from an intensive application graphic or logic).

  --------

  > I understand that well?

  I think that understanding is generally correct, except for the statement about additional impulses.

  > The changes that I made during the gameUpdate causes a trigger pulse... Changes to the live nodes by event handlers will cause an additional impetus to be triggered.

  This is not really correct.   Pulse will always occur 60 times per second (or as soon as possible if the FPS is less than 60 FPS).  Nothing in the application causes an additional impetus.  However, if the application scene is static and don't change not, then pulse runs very quickly because he has little work to do.  JavaFX has mechanism of sale under construction node.  Only Sales (or modified) nodes are displayed on each pulse.  Between pulses, JavaFX will merge all the changes at the scene to determine all the nodes for a given impulse Sales and just make these Sales nodes.

  For example, suppose that your chronology of animation for the game loop is set to trigger 30 times per second, then you could make a scene update on each pulse even.  If a scene update event handler is triggered on a strange impulse, an additional rendering will be on the pulse of odd to manage the sites updated.  If the same event handler is triggered on a same pulse, no additional rendering is required if the game loop is also updating the same nodes (because the nodes are already filthy and dirty nodes are only displayed once per pulse).

  --------

  If you want a very reliable timer which is called like clockwork and is not the potential system hazards pulse JavaFX, then you can use a standard Java Timer, but in doing so, you leave the nature single-threaded protected JavaFX environment when you run the code in the timer, so the Timer code can not update to the live scene graph nodes.  If the timer changes the State of the game which is shared by the event handlers and other reminders that run on the JavaFX UI thread, you will require thread and data synchronization mechanisms, which could get complicated quickly.

  --------

  I think that on the whole, the recommendation would be to run your loop to 60 frames per second instead of 30 frames per second (how you can as well use an AnimationTimer), if you want the best perceived sharpness (in the case otherwise, you find yourself with questions stuttering as such as Nvidia g-sync technology is built to correct, but g-sync as the technology is not widespread).

  You can look at the code sample case brick (from Java Oracle 8 samples), because there were some changes to increase the fine (I think the code passed explicitly to a schedule that you set in your question to use the AnimationTimer, but check).

  The eppleton game engine also uses the approach of AnimationTimer because it is the game loop.

  -------

  > When working with animations (for example. RotateTransition), this animation triggers its own pulses, actually being run to a framerate higher than the loop game?

  Transition animations will be returned to each impulse, they trigger not their own pulse.  The animation can also trigger code to use (on the animation of JavaFX thread) when the time for a keyframe.

  -------

  I think that the way of thinking of time and transformation in JavaFX is that it is not continuous, but rather composed of discrete locations in which work can be done, if the slots correspond to each pulse and get up to 60 times per second.

• my game loop

  
   My game loop works and I want someone to look 
  at it to see if I can improve it AS3 style.
  What I do is load an image from a 
  class and it dispatches an event when completed. When all images are loaded 
  (which is 1 in this example) I then start the game loop which is just a 
  trace.
  
  This way I could load many images and then start the my game loop 
  
  
  This is a skeleton I can build upon. 
   
   
   var noLoaded:int;
  noLoaded=0
  var li:ClassImg2= new ClassImg2("ladybug.png",120,120);
  li.addEventListener("image_loaded",imageLoadedHandler);
  addChild(li);
  
  function imageLoadedHandler(e:Event){
       stage.addEventListener(KeyboardEvent.KEY_DOWN,doSomething);
    noLoaded+=1
  }
  
  
  
   function doSomething(e:KeyboardEvent):void
       {
            
            if (e.keyCode==37) //39 is right arrow
            {
            
            trace("left pressed")
            li.moveleft();
            
            }
            
            if (e.keyCode==39) //39 is right arrow
            {
            
            trace("right pressed")
            li.moveright();
            
            }
       }
       
  stage.addEventListener(Event.ENTER_FRAME, gameLoop);
  
  
  
  
  function gameLoop(event:Event)
        {
       if (noLoaded==1)
            {
            trace("all loaded");     
            }
       }
  

  They are triggered regardless - it's the idea and the beauty of the events. Strictly speaking, because there is no multithreading in Flash - all events in treatment penetrates into the queue of the stack, but most of the time from the performance perspective, it is negligible. That said, your opinion on the control of collisions in the ENTER_FRAME event handler is the way to go.

• game loop

  Can I move an image with a mouse and use a class to load the image.
  This works.

  T1) how can I put this code in a game loop in the file .fla that I need to move objects automatically? Can I use a timer or y at - it something better?

  Q2) how to report an event when the image of the ClassImg2 class has been loaded? I need to know this in the .fla file.

  below .fla file
  ////

  var li: ClassImg2 = new ClassImg2("ladybug.png",120,120);
  addChild (li);

  
  stage.addEventListener (KeyboardEvent.KEY_DOWN, doSomething);

  
  function doSomething(e:KeyboardEvent):void
  {
  
  arrow to the right of to //39 (e.keyCode == 37)
  {
  
  trace ("down left")
  Li.MoveLeft ();
  
  }
  
  arrow to the right of to //39 (e.keyCode == 39)
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  trace ("down right")
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  }
  
  }

  "q1) how can I put this code in a game loop in the file .fla that I need to move objects automatically? Can I use a timer or y at - it something better? »

  It depends on the definition of "change". If you need a smooth animation - you will need an engine like TweenLite/TweenMax interpolation

  "q2) how to report an event when the image of the ClassImg2 class has been loaded. I need to know this in the .fla file. »

  Send the event to the class and listen to it on the timeline.

  Syntax for sending of the event:

  dispatchEvent (new Event ("eventTypeGoesHere"));

  Here's the documentation;

  http://www.Adobe.com/LiveDocs/Flash/9.0/ActionScriptLangRefV3/Flash/events/EventDispatcher .html#dispatchEvent%28%29

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